UM10917 - NXP Semiconductors
Contents
1. 5 V 5 V 5V i T i R3 R36 R37 215 kQ 100 kQ 2MQ n m n m n m D4 n m BAW56S D4 nm 12 ih s BAW56S 5V 5V 5V 5 V 5 V 5 V 5V 5V 1 3 PI x14 9 9 9 9 9 Ki 4 4 n m 22 28 4020 Pl 1 R34 p H2 e 100 ka 100 ka m R15 R11 R9 R7 R5 100 nF R38 us 0a X AN 390 KO 390 kO 390 KQ 390 kQ nm nm 50V 4MQ 2 n m GREEN RED close to close to ih BUZZER x x inductor NXQ1TXA5 AS Lt lI xl MB uo 9 5 7 o 4 8 8 S S 4 I C8 I C10 a a 10 nF 22 uF I 50V l 10V a a x Y 4 R8 9 R14 R13 R12 R10 R6 1ko 200 Jeska ozka 2 2 Joa z TOM iu c2 i o i M 10 6 8 nF LED R QUT2 50V LED_G 7 C6 c5 C1 C3 NFC FD N 100 nF 100 nF 22nF 82nF 16 50V 50V 50V 50V BUZZ 5 NXQ1TXA5 SDA hV hV SDA 3 inductor X2 n m SPR2 p SPR2 2 E2 M20 78306 16 SPR1 OUT IND2 SPR1 1 NFC_DIS 33 32 31 30 29 28 R1 n SOL RDA R31 R30 10 6 8 nF NFC DIS 50V SPR1 d bn n m to SEES R33 R32 00 00 5V n m v G1 10104111 0001LF G2 C12 c11 c7 c9 nm 32768 kHz eo pF zz mz 100 nF 10 nF E 22pF L3 n m R13 5V 5V 32 768kKH2 F Ll 50v 50 V 50 V 10V DLWSBTM2. Po W Fig 9 System efficiency for the combination of the NXQ1TXA5DB1340 demo board and a Samsung Galaxy S5 back cover Qi receiver 6 2 Thermal performance When operating under maximum load conditions 5 W transferred to the load battery on the Qi receiver side the maximum temperature on the NXQ1TXA5DB1340 demo board is an important performance parameter Figure 10 shows a thermal image FLIR infrared thermal imaging camera of the NXQ1TXA5DB1340 demo board under maximum load conditions and optimal alignment between the transmitter and the receiver coil The Samsung Galaxy S5 back cover Qi receiver was used as the receiver The maximum temperature difference between the ambient and the hottest spot on the board was 21 2 C If the transmitter coil and the receiver coil are misaligned approximately 1 cm and the delivered power is still 5 W the maximum temperature difference increases to 43 0 C All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 21 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board aaa 019197 Fig 10 Thermal image at 5 W delivered power and optimal alignment Box Max 70 4 aaa 019198 Fig 11 Thermal image at 5 W delivered power and approximately 1 cm misalignment
3. 6 Indicators llle 10 Schematic elm Re ee nns 12 Bill Of Materials BOM 13 PCBlayout ee cer eer nn 15 Electrical layout aspects 17 Thermal layout aspects 18 Performance i iclecel e Rl e n sear 20 Efficiency lslllslsllllssllssse 20 Thermal performance 21 EMI performance 2 55 23 NXQ1TXA5DB1340 demo board options and modifications llll 26 Smart Power Limiting SPL and Smart Power Reduction SPR 26 NEG 2A edie he de beets 26 LEDs and buzzer 0005 26 Blue LED 2 ect RRDDR RI cares 26 Green LED oen rette ERE 26 Red LED 215i RRERUIRI Ire 27 BUZZER sa fos denar Bact amok a dee pha das 27 FOD emnin dev Eae ERR Dre 27 NIC testi u teu ts Un 28 Monitoring NXQ1TXA5 temperature 28 Monitoring transmitter coil temperature 28 Monitoring the NXQ1TXA5 and transmitter coil temperature 0 000 29 Abbreviations llle 30 References i i olo lg xn hee wa ie 30 Legal information leues 31 Definitions llle 31 Disclaimers llle 31 Trademarks llle 31 Contents eie cu par ate eine e s Sean 32 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information NXP Semiconduct
4. UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 22 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 6 3 EMI performance The NXQ1TXA5DB1340 demo board meets the CISPR22 EN55022 requirements for both conducted and radiated emissions All measurements were done at 5 W delivered to a load connected to the Samsung Galaxy S5 back cover Qi receiver under optimal alignment conditions Figure 12 shows the conducted EMI spectrum for the NXQ1TXA5DB1340 demo board only The 5 V supply to the board was from an EMI free linear power supply Both the peak and the average emissions have over 30 dB margin compared to the limits Figure 13 shows the radiated EMI under the same conditions For radiated EMI the margin compared to the limit is typically 20 dB and at no frequency less than 10 dB QP Limit Prescan Avg Avg Limit x QP Final Prescan Pk Avg Final 80 T T voltage dBpV T 604 i Nun h m T VET p A aasi A hn WU Tr ia Arn ene mite i 15 1 frequency MHz 20 019199 Fig 12 Conducted EMI for the NXQ1TXA5DB1340 demo board only Moriz ntal Quas Peak Vertical Limit fine
5. UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 7 5 NTC 7 5 1 7 5 2 One or two temperature sensors can be used on the NXQ1TXA5DB1340 demo board One sensor is intended to measure the temperature on the NXQ1TXA5DB1340 board close to the NXQ1TXA5 IC The other sensor is intended to measure the temperature of the transmitter coil Monitoring NXQ1TXA5 temperature If monitoring the NXQ1TXA5 IC temperature is required and if the application must react to that temperature accordingly an SMT thermistor must to be mounted in the R35 position Additionally R36 and C27 must be mounted as well Resistor R38 must be eliminated from the board Finally all 6 contacts of the D4 diode array must be shorted with a drop of solder The values of resistor R36 and thermistor R35 determine the trip and resume temperature levels For details and instructions regarding the calculation see the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 1 T CC 2 v 4 55 2 298 15 p 2l R35 1 6 T EET US 3 7 HC a 11 E88 i 298 15 p 39 R35 Example e R36 100 ka e R35 100 KQ at 25 C e 6 4250K The trip temperature Trip is 64 C and the resume temperature Tres is 54 C For more information see the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 Monitoring transmitter coil temperature If monitoring the transmitter coil temperature is required and if
6. Table 6 B coefficient value set via FOD2 Input voltage on pin FOD2 Vrop2 0 04 V FOD parameter B default value for parameters B and C B 0 11 and C 0 012 0 067 x Vrope V 0 05l11 reserved 0 085 V lt Vgop lt 1 29 V 1 335 V lt Veop2 lt Vppp Vppp is maximum input level 1 This equation assumes Vppp 5 V To compensate for changes in the supply voltage level the results are automatically adjusted Table 7 C coefficient value set via FOD3 Input voltage on pin FOD3 FOD parameter C 0 210 V lt Vrops lt 0 290 VI 0 006 0 585 V lt Vrops lt 0 665 VI 0 008 0 960 V lt Vrops lt 1 040 Vil 0 010 Vrops gt 1 335 V 0 012 Vppp is maximum input level other voltage levels reserved 1 This condition assumes Vppp 5 V To compensate for changes in the supply voltage level the conditions are automatically adjusted 2 5 Indicators The NXQ1TXA5DB1340 demo board incorporates 3 on board LED indicators H1 Green LED user interface information see Table 3 H2 Red LED user interface information see Table 3 H3 Blue LED Power on status ON when 5 V supply present Optionally a buzzer can be connected to X14 When the buzzer is connected resistor R34 1 kO must be mounted as well Table 4 gives the behavior of the buzzer When the NXQ1TXA5DB1340 demo board is powered on the green and red LEDs blink alternately followed by
7. Two LED 6 two short beeps on entering state off one short beep every 4 S while in state Two LED 7 two short beeps on entering state 4 short beeps on entering state one short beep every 4 S while in state Two LED 8 two short beeps on entering state 4 short beeps on entering state one short beep every 4 S while in state One LED 1 amp 2 two short beeps on entering state off one short beep every 4 S while in state One LED 3 amp 4 two short beeps on entering state 4 short beeps on entering state one short beep every 4 S while in state One LED 5 amp 6 two short beeps on entering state off one short beep every 4 S while in state Debug LED two short beeps on entering state 4 short beeps on entering state one short beep every 4 S while in state p1eoq ouiep JejulsueJ SS9J9JIM IO A S diuo euo ope Lg aS vXLLOXN ZL60LINN SIOJONPUOSIWIS dXN NXP Semiconductors UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Table 5 FOD threshold difference Input voltage on pin FOD1 FOD threshold level Veop1 0 04 V no FOD 0 25 V lt Veopi lt 1 29 V Veop1 V 1 5 WEI 1 335 V lt Veop1 lt Vpppe 0 5 W default value Vppp is maximum input level 1 This equation assumes Vppp 5 V To compensate for changes in the supply voltage level the results are automatically adjusted
8. x OD Mere o RR xe x x XOU P oo oo lt 9 e RRRERS Sen e es c Ry w Aet D cases ARR TR eR CORO KOT RSSRSS SS s RY S see c M OIA ANO EET 1529292 KKK NS NS SY QW see detail X NS s NSSSN N SY S AX SS solder mask L Sa solder land plus solder paste EXXXXI Beas 2992o Xxx 2929S 8626202624 7 WY solder land occupied area Y 7 solder paste copper connect plus solder mask RY p A pp p 1 1 J Recommended stencil thickness 0 1 mm Dimensions in mm Gx Gy Hx nSPx nSPy SPy SLy SPxtot SPytot SPx SLx 5 fr nxqttxa 15 06 30 Issue date footprint ing flow solder ion specific re Applicat Fig 7 NXP Semiconductors N V 2015 All rights reserved All information provided in this document is subject to legal disclaimers UM10917 Rev 1 3 August 2015 19 of 32 User manual NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 6 Performance 6 1 Efficiency In the power transfer path from the USB receptacle input to the load battery at the output of the Qi receiver power is lost due to conversion and transfer mechanisms Below in blue the typical efficiency of the NXQ1TXA5DB1340 demo board alone is shown The typical efficiency of the demo board is
9. 1 j2 ja 0 10 frequency MHz w u 019211 Fig 17 Radiated EMI for the NXQ1TXA5DB1340 board with the Nokia AC 60E The NXQ1TXA5DB1340 demo board mainly contributes to the radiated EMI spectrum of above 100 MHz Most of the other noise can usually be attributed to the USB adapter All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 25 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 7 NXQ1TXA5DB1340 demo board options and modifications UM10917 7 1 7 2 7 3 7 3 1 7 3 2 Various alternative circuit options exist that can be realized on the NXQ1TXA5DB1340 demo board Smart Power Limiting SPL and Smart Power Reduction SPR Alternative Smart Power Limiting and Smart Power Reduction levels can be set with the jumpers in the R30 R31 R32 and R33 position Details about the settings are given in Table 1 and in the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 Never install the solder jumpers in position R30 and R31 or the jumpers in position R32 and R33 simultaneously NFC The NXQ1TXA5 can also be used with an NFC reader enabled receiver When the NFC_FD_N pin is LOW a start up delay of about 2 s is inserted when an NFC enabled receiver is placed on the charger This delay allows the NFC enable
10. B0 field 70 strength dBuV m 60 50 40 30 4 103 220 01920C 10 frequency MHz Fig 13 Radiated EMI for the NXQ1TXA5DB1340 demo board only EMI performance was also measured in combination with two regular 5 V USB adapters Samsung EP TA10 Nokia AC 60E UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 23 of 32 NXP Semiconductors UM1 091 T UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Figure 14 shows the conducted EMI spectrum for the NXQ1TXA5DB1340 demo board in combination with the Samsung EP TA10 USB adapter Both peak and average emission have typically around 20 dB margin compared to the limits At no frequency the margin is less than 10 dB Figure 15 shows the radiated EMI under the same conditions For radiated EMI the margin compared to the limit is typically in the range of 15 dB to 20 dB At no frequency it is less than 8 dB OP Limit Prescan Avg Avg Limit x QP Final 72 Prescan Pk Avg Final voltage dBpV frequency MHz 882 019202 Fig 14 Conducted EMI for the NXQ1TXA5DB1340 board with the Samsung EP TA10 Horizontal Quasi Peak Vertical Li
11. This document as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from competent authorities Evaluation products This product is provided on an as is and with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of this product remains with customer In no event shall NXP Semiconductors its affiliates or their suppliers be liable to customer for any special indirect consequential punitive or incidental damages including without limitation damages for loss of business business interruption loss of use loss of data or information and the like arising out the use of or inability to use the product whether or not based on tort including negligence strict liability breach of contract breach of warranty or any other theory even if advised of the possibility of such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and cu
12. WPC 1 1 demo board The demo board is designed for A11 Qi coils based on the NXP Semiconductors NXQ1TXA5 fully integrated wireless power transmitter IC for Qi compliant 5 V low power transmitters The NXQ1TXA5 comes in a 5 mm x 5 mm HVQFN32 package Necessary information is given for a quick start up of the demo board see Chapter 2 Setup and operation of the NXQ1TXA5DB1340 demo board Additional general information about the NXQ1TXA5 IC can be found in the One chip 5 V Qi wireless transmitter data sheet Ref 1 All relevant general application information can be found in the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 1 1 NXQ1TXA5 features Single chip WPC 1 1 2 Qi compliant device for A5 A11 A12 A16 5 V single coil low power transmitter Operates from 5 V supply Integrated high efficiency full bridge power stage with low EMI radiation meeting EN55022 radiated and conducted emission limits Very few external components required minimizing cost and board space Extremely low power receiver detection circuitry standby power 10 mW typical Power stage fully protected against overcurrent and overtemperature Fully integrated accurate coil current measurement Demodulates and decodes communication packages from Qi compliant receivers PID regulation for closed loop power drive and control All information provided in this document is subject to legal disclaimers NXP Semiconducto
13. m UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Rev 1 3 August 2015 User manual Document information Info Content Keywords NXQ1TXA5DB1340 NXQ1TXAS5 wireless charger high efficiency CoolFlux DSP A5 A11 Qi Abstract This user manual describes the NXQ1TXA5DB19340 wireless power transmitter WPC1 1 demo board It is designed for A11 Qi coils based on the NXP Semiconductors NXQ1TXAS fully integrated wireless power transmitter IC for Qi compliant 5 V low power transmitters The hardware is described and a brief description for operating the board is given NXP Semiconductors UM10917 Revision history NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Rev Date Description v 1 20150803 first issue Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 2 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 1 Introduction UM10917 aaa 019186 Fig 1 NXQ1TXA5DB1340 demo board This user manual describes the NXQ1TXA5DB1340 wireless power transmitter
14. the application must react to that temperature accordingly a wired thermistor must to be connected to the R4 wire holes physically located between the transmitter coil soldering islands Additionally R3 and C27 must be mounted Resistor R38 must be eliminated from the board Finally all 6 contacts of the D4 diode array must be shorted with a drop of solder The values of resistor R3 and thermistor R4 determine the trip and resume temperature levels For details and instructions regarding the calculation see the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 1 Trip 4 zT Bog a All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 28 of 32 NXP Semiconductors UM1 091 T UM10917 7 5 3 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Lat ih RD B 298 15 aa E mS Example e R3 215kQ e R4 100 kQ at 25 C e p24250K The trip temperature Tirip is 45 C and the resume temperature Tres is 36 C Monitoring the NXQ1TXAS5 and transmitter coil temperature If monitoring both the NXQ1TXAS IC and the transmitter coil temperature is required and if the application must react to these temperatures accordingly an SMT thermistor must to be mounted in position R35 A wired thermistor must be connected to the R4 wire holes Resistors
15. this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 15 of 32 UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board NXP Semiconductors NXQ1TXASDB1340 a w O2 z x2 T mm rd R34 R33 Q 92 lor R31 o AL x xi4 R30GI e 00 ES BUZZER Q i x1 C13 S R1 coy 9 R42 2Q bs ONE s AT 10 Chu i NO OD geet aaa 018577 Fig 5 Top side with silk screen UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 16 of 32 NXP Semiconductors UM10917 UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Fig 6 SUUM m A 2 oe m 0009 S e e aaa 018578 Top side with via pattern 5 1 Electrical layout aspects To enhance electrical conduction the top and the bottom copper layer have a thickness of 70 um 2 Oz The bottom layer is a shielding GND plane It has been made maximally uninterrupted Shielding non current conducting GND planes in the top copper layer are stitched to the non current conducting GND areas of the bottom layer GND plane The stitching is done with vias on the edges of the planes It can easily be recognized on the right hand side of Figure 6 To prevent unnecessary power loss VDD power t
16. 25ISGL 4 l oa L L KPHHS 1005QBC D V 4 3 C26 cis jr 10 nF 100uF 50 V sav f id 1 2 mun R42 3 9 ka aaa 019192 0a Fig 3 NXQ1TXA5DB1340 demo board schematic diagram UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 12 of 32 NXP Semiconductors UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 4 Bill Of Materials BOM Table 8 NXQ1TXA6 bill of materials Reference Description and values Part number Manufacturer C1 C2 capacitor 6 8 nF 50 V 0603 C3 C4 capacitor 82 nF 50 V NPO 1206 GRM31C5C1H823JA01L Murata C5 C6 capacitor 100 nF 50 V NPO 1206 CGA5L2C0G1H104J160AA TDK C7 C8 capacitor 10 nF 50 V NPO 0603 C9 C10 capacitor 22 uF 10 V X7R 1206 GRM31CR61A226KE19L Murata C11 capacitor 100 nF 50 V X7R 0603 C12 capacitor 2 2 pF 50 V 0603 C13 capacitor 100 uF 6 3 V X5R 1206 GRM31CR60J107ME39L Murata C26 capacitor 10 nF 50 V X7R 0805 C27 capacitor not mounted 100 nF 25V l X7R 0603 C28 capacitor not mounted 1 uF 25 V x X7R 0805 D4 diode array not mounted CA BAW56S NXP Semiconductors SOT363 G1 crystal XTAL 32 768 kHz SMT 3215 Yoketan Corporation G2 crystal XTAL not mounted AB
17. 26TRQ 32 768kHz T Abracon Corporation 32 768 kHz SMT H1 LED green 0402 KPHHS 1005MGCK Allied Electronics H2 LED red 0402 KPHHS 1005SURCK Allied Electronics H3 LED blue 0402 KPHHS 1005QBC D V Allied Electronics L3 inductor common mode choke not DLW5BTM251SQ2L Murata mounted N1 IC NXQ1TXA5 NXP Semiconductors R1 R2 resistor 1 Q 0603 2 R3 resistor not mounted 215 kO 1 96 0603 R4 thermistor NTC not mounted 100 kQ NXFT15WF104FA2B050 Murata 196 4250 K R5 R7 R9 R11 resistor 390 kQ 1 96 0603 R6 R15 resistor 0 Q 0805 R8 resistor not mounted 22 kQ 1 96 0805 R10 resistor 82 kO 1 96 0805 R12 resistor 68 KQ 1 96 0805 R13 resistor 820 Q 0603 E R14 resistor 1 kQ 0603 R30 R32 resistor not mounted 0 Q R31 R33 resistor 0 Q solder closed R34 resistor not mounted 1 KQ 1 96 0603 UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 13 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Table 8 NXQ1TXA5 bill of materials continued Reference Description and values Part number Manufacturer R35 thermistor NTC not mounted 100 kQ NCP18WF104J03RB Murata 596 4250 K R36 resistor not mounted 100 kQ 1 96 0603 R37 resistor not mounted 2 MQ 1
18. 96 0603 R38 resistor 1 MO 1 96 0603 R42 resistor 3 9 kQ 1 96 0603 R43 R44 resistor true 0 Q 0805 5106 Keystone X1 connector micro USB PCB socket 10104111 0001LF FCI X2 receptacle straight not mounted M20 7830546 Harwin 2 x 5 way 2 54 mm X14 header straight not mounted Molex 1 x 2 way 2 54 mm UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 14 of 32 NXP Semiconductors UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 5 PCB layout The layout of an NXQ1TXA5 wireless power transmitter application is critical from an electrical and a thermal point of view The PCB layout of the NXQ1TXA5DB1340 demo board as well as the aspects that are essential for proper operation are briefly explained below More detailed explanations are given in the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 Fig 4 NXO1TXA50B1340 y 8 m x2 Ra i 6 ng pM ms Qu RLI 285 z Jus mes ree BUZZER G nS g xi C13 Raa a N NL P o g czer CENT _ 2 R42 ph ee 22 59 Cio Noga cs ee ius 5 ce L o4 2m aaa 018575 aaa 018574 a Top copper b Component silk screen NXQ1TXA5DB1340 demo board layout aaa 018576 c Bottom copper UM10917 All information provided in
19. R3 R36 R37 and capacitor C27 must be mounted as well Finally the D4 diode array must be mounted The diode array operates as an OR ing circuit for the two monitored temperatures The values of resistor R36 and thermistor R35 determine the trip and resume temperature levels for the NXQ1TXA5 IC temperature The values of resistor R3 and thermistor R4 determine the trip and resume temperature levels for the coil temperature For details and instructions regarding the calculation see the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 29 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 8 Abbreviations Table 9 Abbreviations Acronym Description EMI ElectroMagnetic Interference FOD Foreign Object Detection LED Light Emitting Diode NFC Near Field Communication NTC Negative Temperature Coefficient SPL Smart Power Limiting SPR Static Power Reduction WPC Wireless Power Consortium 9 References 1 One chip 5 V Qi wireless transmitter Data sheet NXP Semiconductors 2015 2 NXQ1TXA5 one chip 5 V Qi wireless transmitter Application note NXP Semiconductors 2015 3 Samsung Wireless charging cover Model EP CG900IBE
20. UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 30 of 32 NXP Semiconductors UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 10 Legal information 10 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 10 2 Disclaimers Limited warranty and liability Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outside of NXP Semiconductors In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages including without limitation lost profits lost savings business interruption costs related to the removal or replacement of any
21. and the consequences for FOD behavior The R9 R10 pair sets the voltage on the FOD2 pin pin 10 The voltage on the FOD2 pin sets the B coefficient in FOD power loss estimation equation For details see the One chip 5 V Qi wireless transmitter data sheet Ref 1 and the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 In the default configuration R9 390 kQ R10 82 kQ the B coefficient is set to 0 108 Table 6 gives an overview of the selectable FOD2 voltage levels and the consequences for FOD behavior The R7 R8 pair sets the voltage on the FODS pin pin 11 The voltage on the FOD3 pin sets the C coefficient in FOD power loss estimation equation For details see the One chip 5 V Qi wireless transmitter data sheet Ref 1 and the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 In the default UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 6 of 32 NXP Semiconductors UM1 091 T UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board configuration R7 390 kQ R10 OPEN the C coefficient is set to 0 012 Table 7 gives an overview of the selectable FOD3 voltage levels and the consequences for FOD behavior Summary Upon delivery FOD is enabled with the FOD threshold level set to 0 5 W B 0 108 an
22. arged mode when a charge complete message is received 2 Receiver reports internal fault overtemperature battery failure or no response Transmitter reports OTP or FOD If the receiver reports overcurrent overvoltage or unknown the device restarts and goes back to ping state 3 User can connect LED to either LED_R or LED_G so the voltage on CONFIG could be used to enable two separate One LED modes p1eoq ow ap JejusueJ SSo 9JIM ID A S diuo euo OVELAGSVXLLOXN ZL60LINN SIOJONPUOSIWIS dXN Slog 1snBny eu jenuew ssn sieuirejosip eba 0 1oefqns s jueuunoop S14 ui pepi oid uoneuuojui y c 10 6 ZL6OLWN pamasa Syu Ily S LOZ A N SJoonpuoorues dXN Table 4 Buzzer modes LED mode Buzzer mode Start charging Receiver fully charged Error FOD OTP RX ASK time out not an error Two LED 1 two short beeps on entering state off one short beep every 4 S while in state Two LED 2 two short beeps on entering state off one short beep every 4 S while in state Two LED 3 two short beeps on entering state 4 short beeps on entering state one short beep every 4 S while in state Two LED 4 two short beeps on entering state 4 short beeps on entering state one short beep every 4 S while in state Two LED 5 two short beeps on entering state off one short beep every 4 S while in state
23. both LEDs being turned on and turned off After that sequence the NXQ1TXAS5 enters analog ping mode It checks once every 400 ms if a device is placed on the charger The green LED H1 blinks every 4 s indicating a digital ping being performed Once a Qi compliant receiver is put on top of the Qi transmitter coil and the NXQ1TXAS5 detects the receiver it starts wireless power transmission The green LED H2 turns on permanently until the receiver is removed again If the power supply capability is UM10917 All information provided in this document is subject to legal disclaimers Rev 1 3 August 2015 NXP Semiconductors N V 2015 All rights reserved 10 of 32 User manual UM10917 NXP Semiconductors NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board limited the NXQ1TXA5 enters Smart Power Limiting mode To avoid that the supply voltage drops below 4 2 V SPL reduces the output power The green LED H2 then blinks with 1 s intervals When a fault is detected the red LED H2 blinks once every 1 s All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved UM10917 User manual Rev 1 3 August 2015 11 of 32 NXP Semiconductors UM10917 3 Schematic NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board
24. both grounded Consequently on delivery the SPR function is disabled Details about alternative options are given in the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 Table 1 SPL status and SPR level SPR1 SPR2 SPL status and SPR level 0 ground 0 ground SPL on no SPR limiting 0 ground 1 Vppp SPL on 500 mA 1 Vppp 0 ground SPL on 1000 mA 1 Vppp 1 Vppp SPL off no SPR limiting By default the 0603 size jumper in position R15 sets the logic level on the NFC FD N pin pin 6 high By this setting there is no start up delay that would allow NFC communication to finalize before power transfer begins 2 4 Configuration and FOD settings To set the LED buzzer mode configuration and the FOD parameters four pairs of resistors are used The R5 R6 pair sets the voltage level on the CONFIG pin pin 12 The voltage on this pin defines the operation mode of LEDs and the buzzer see also Section 2 5 In the default configuration mode Two LED 1 is selected Table 2 lists the modes that are available Table 3 and Table 4 describe the behavior of the LEDs and the buzzer for each of these modes The R11 R12 pair sets the voltage on the FOD1 pin pin 9 The voltage on the FOD1 pin sets the FOD threshold level In the default configuration R11 390 kQ R12 68 kQ the FOD threshold level is set to 0 5 W Table 5 gives an overview of the selectable FOD1 voltage levels
25. d C 0 012 Additional details concerning FOD FOD1 FOD2 and FOD3 settings and calibration can be found in the One chip 5 V Qi wireless transmitter data sheet Ref 1 and the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 Table 2 Mode selection Input voltage on pin CONFIG Mode name Vcowria lt 40 mV two LED 1 85 mV lt VconFig lt 165 mV two LED 2 210 mV lt Vcowria lt 290 mV two LED 3 335 mV lt Vconrig lt 415 mV two LED 4 460 mV lt Vcowria lt 540 mV two LED 5 585 mV lt Vconrig lt 665 mV two LED 6 710 mV lt Vcowria lt 790 mV two LED 7 835 mV lt Vconrig lt 915 mV two LED 8 960 mV lt Vcowric lt 1040 mV one LED 1 amp 2 1085 mV lt Vconrig lt 1165 mV one LED3 amp 4 1210 mV lt Vcowric lt 1290 mV one LED 5 amp 6 VconriG gt 1335 mV debug LED All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 7 of 32 Soz ysnBny eu jenuew ssn SJOLUIE OSIP ea oj 1oefqns s JUBWINDOP SI ui PEPIAOIG uoneuuojul y c 108 ZL6OLWN pamasa siuDu Iv S LOZ AN S1O ONPUDDIWES dXN Table 3 LED modes LED Mode Digital_Ping LED G Charging LED G Receiver Fault detected Power T
26. d receiver to finalize communication with an NFC TAG before charging begins The NXQ1TXAS starts up after this delay When it has detected a WPC compliant Qi receiver it starts to charge this device and disables the NFC functionality in the NFC reader via the NFC DIS pin If this feature is required the jumper in position R15 must be removed and pin 6 of the IC must be connected to GND LEDs and buzzer By default the user interface is built with 3 LEDs e The blue LED indicates the power status The green LED gives information about the operational status of the NXQ1TXA5DB1340 demo board The red LED informs the user about faults that occur Blue LED The blue power status LED can be eliminated when no presentation of the power status information is required When the blue LED is eliminated R42 can be eliminated as well Adapting the R42 resistor value can change the brightness level of the blue LED Do not select a value below 150 O because the dissipation level in the blue LED can become too high Green LED The green LED can be eliminated when no information about the operational status is required When the green LED is eliminated R14 can be eliminated as well The green LED can be set to behave differently by selecting another mode on the CONFIG pin pin 12 of the NXQ1TXAS5 IC A specific mode is selected by presenting a specific voltage level Vconrig to pin 12 All information provided in this document is subject to
27. d thermal conduction the GND pins and the power conducting pins of the IC are attached to large copper areas Underneath the NXQ1TXAS IC a pattern of 16 copper filled thermal vias see Figure 6 conducts heat from the top side to the bottom side of the PCB Figure 7 shows the footprint that was used for soldering Many thermal vias surround the NXQ1TXA5 IC The IC is the dominant dissipating component The top and bottom layers of the PCB are covered with standard solder resist Standard solder resist has a fairly good emissivity which enhances thermal radiation Uncovered and shiny areas on the PCB are kept to a minimum All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 18 of 32 UM10917 less transmitter demo board NXP Semiconductors i wire NXQ1TXA5DB1340 one chip 5 VQ NXQ1TXA5 f HVQFN32 package ing o ion for reflow solderi Footprint informat terminal 1 index area RR Aa AASS NS PANNI pS S SKK KKK KKK oo GO ORO 0 0 000000 0 06 060000000000 06 06000000005 c1 S7 My 75 Lz 1A K7 NS SS NI Z A Lip Wi 2 Li W Z 7 9 D e 77 Q LZ TT Uj My g 7 ll Z o Z LL A Z Z f f p 3 12 SLy By Ay e 00000 e e 9905 se x e
28. h the Qi transmitter coil make up the LC tank A female micro USB receptacle for powering the board with a standard USB charger with rating of 1500 mA or more A11 Qi transmitter coil Resistors for FOD calibration settings Resistors for LED mode settings Solder jumpers for Smart Power Limiting SPL and Static Power Reduction SPR settings Optional Negative Temperature Coefficient NTC connections to measure the coil temperature Optional buzzer connection Optional communication interface beyond the scope of this manual All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 4 of 32 NXP Semiconductors UM1 091 7 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 2 Setup and operation of the NXQ1TXA5DB1340 demo board 2 4 NXQ1TXA5DB1340 board overview Communication interface option SPR SPL P qr jumpers connection NXQ1TXAS NTC connection Micro USB receptacle Blue LED P DN Green LED CONFIG and Transmitter coil FOD resistors aaa 019189 Fig 2 NXQ1TXA5DB1340 demo board assembly top side 2 2 Connectors The NXQ1TXA5DB1340 demo board incorporates an on board female micro USB receptacle Via this connector 5 V is supplied to the board A standard USB adapter 5 V minimum 1 5 A can be used to feed the board Optionally a 10 pole dual in line connec
29. legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 26 of 32 NXP Semiconductors UM1 091 7 UM10917 7 3 3 7 3 4 7 4 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Table 2 gives an overview of the available modes and related voltage levels VconFia Table 3 gives an overview of the way the green LED behaves for a specific mode Set a specific mode by selecting a different resistance value for resistor R6 R6 VcONFIG gs RG 5 0 1 Adapting the R14 resistor value can change the brightness level of the green LED Do not select a value below 150 Q because the dissipation level in the green LED can become too high Red LED The red LED can be eliminated when no information about fault conditions is required or when the fault condition information is combined with operational information The latter is implemented through selecting one of the One LED x amp y modes listed in Table 2 When the red LED is eliminated R13 can be eliminated as well The way the red LED behaves is selected through the CONFIG pin pin 12 see Table 3 Adapting the R13 resistor value can change the brightness level of the red LED Do not select a value below 150 O because the dissipation level in the red LED can become too high Buzzer If in addition to visual information audial information is required a buzzer can be connected to the X14 connect
30. mit line 80 feg 70 strength dBpVim dBy eb 50 thet frequency MHz 0 019202 Fig 15 Radiated EMI for the NXQ1TXA5DB1340 board with the Samsung EP TA10 Figure 16 shows the conducted EMI spectrum for the NXQ1TXA5DB1340 demo board in combination with the Nokia AC 60E USB adapter The peak and the average emissions typically have an approximately 15 dB margin compared to the limits At no frequency the margin is less than 10 dB Figure 17 shows the radiated EMI under the same conditions For radiated EMI the margin compared to the limit is typically in the range of 15 dB to 20 dB At no frequency it is less than 10 dB All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 24 of 32 NXP Semiconductors UM1 091 T UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board OP Limit Prescan Avg Avg Limit x OP Final Prescan Pk Avg Final i I r T voltage dByV d NN nme Ni Mw pma jode frequency MHz aa 019210 Fig 16 Conducted EMI for the NXQ1TXA5DB1340 board with the Nokia AC 60E Horizontal Quasi Peak Vertical Limit line B0 field 70 strength dBuV m 60 10 T L ts
31. or If a buzzer is connected resistor R34 must be mounted as well Table 4 gives an overview of how the buzzer behaves when a certain mode is selected through the CONFIG pin FOD The NXQ1TXA5DB1340 demo board is delivered with the FOD threshold level set to 0 5 W with Veop1 the B coefficient set to 0 108 with VFop2 and the C coefficient set to 0 012 with Veop3 By applying other voltage levels to pins FOD1 pin 9 FOD2 pin 10 and FOD3 pin 11 other settings can be realized See Table 5 to Table 7 and the NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 If no FOD is required pin FOD1 can be connected to GND Consequently pins FOD2 and FODS can be grounded as well Resistors R5 R6 R7 R8 R9 and R10 can be eliminated If no flexibility in setting the threshold level is required and the 0 5 W level is appropriate pin FOD1 can be connected to Vppp So resistors R11 and R12 can be eliminated When the coefficients B 0 11 and C 0 012 are appropriate pin FOD2 can be connected to GND and pin FODS to Vppp Resistors R5 R6 R7 and R8 can be eliminated In this way two standard configurations No FOD and default FOD can be implemented without using configuration resistors All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 27 of 32 NXP Semiconductors UM1 091 T
32. ors N V 2015 All rights reserved For more information please visit http Awww nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 3 August 2015 Document identifier UM10917
33. products or rework charges whether or not such damages are based on tort including negligence warranty breach of contract or any other legal theory Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical systems or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors and its suppliers accept no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative pu
34. races to pins 15 and 16 and to pins 25 and 26 are wide low impedance low loss traces Decoupling capacitors C10 and C8 are placed very close to pins 15 and 16 They have a low impedance connection to GND The same applies to capacitors C9 and C7 which are very close to pins 25 and 26 In this way the two supply loops see Figure 5 are kept as small as possible Snubber circuit capacitor C1 and resistor R1 and capacitor C2 and resistor R2 are mounted close to the output pins pins 17 and 18 pins 23 and 24 The GND connections of the snubber circuits are close to IC GNDP pins 19 20 21 and 22 In this way the two snubber loops see Figure 5 are kept as small as possible The output pins of the NXQ1TXAS5 IC have very wide low impedance traces to the LC tank All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 17 of 32 NXP Semiconductors UM1 091 T UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Decoupling capacitor C11 is placed very close to pin 28 It has a low impedance connection to GND To prevent overtones the length of the traces leading to the crystal in series with the C12 capacitor is approximately 1 cm 5 2 Thermal layout aspects The NXQ1TXAS IC is placed more or less in the center of the PCB In that way the IC benefits most from its cooling circle To ensure goo
35. ransfer mode charged ED R LED G Two LED 1 blink for 100 ms every 4 seconds on full power off blink at 1 Hz off blink for 100 ms every 400 ms when object detected blink at 0 5 Hz limited power Two LED 2 loff SPL SPR or average current off exceeds 2 A Two LED 3 blink for 100 ms every 4 seconds off blink at 0 5 Hz blink for 100 ms every 400 ms when device detected Two LED 4 off off Two LED 5 blink for 100 ms every 4 seconds off blink at 1 Hz blink at 1 Hz blink for 100 ms every 400 ms when device detected Two LED 6 off off Two LED 7 off off blink at 2 Hz blink at 2 Hz Two LED 8 reserved One LED LED_G blink for 100 ms every 4 seconds on full power off X blink at 2 Hz for 1 amp 253 blink for 100 ms every 400 ms when device detected blink at 0 5 Hz limited power TX RX error no SPL SPR or average current blink on FOD LED R blink for 100 ms every 4 seconds exceeds 2 A off off x blink for 100 ms every 400 ms when device detected One LED LED G off off x blink at 2 Hz for 3 amp 4 31 TX RX error no blink on FOD LED R off off off x One LED LED_G blink for 100 ms every 4 seconds blink at 0 5 Hz on x blink at 2 Hz for 5 amp 6l blink for 100 ms every 400 ms when device detected TX RX error no blink on FOD LED R off on off x Debug LED reserved 1 charge complete or charge status 100 message received via RX NXQ1TXAS5 remains in Power Transfer mode while charge status 100 is reported it switches to Ch
36. rposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product UM10917 All information provided in this document is subject to legal disclaimers design It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of customer s third party customer s Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products NXP Semiconductors does not accept any liability related to any default damage costs or problem which is based on any weakness or default in the customer s applications or products or the application or use by customer s third party customer s Customer is responsible for doing all necessary testing for the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer s NXP does not accept any liability in this respect Export control
37. rs N V 2015 All rights reserved User manual Rev 1 3 August 2015 3 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board Internal 1 8 V digital supply generation LED 2x and buzzer outputs NTC input for external temperature check and protection On chip thermal protection Small HVQFN 32 pin package 5 mm x 5 mm with a 0 5 mm pitch Foreign Object Detection FOD with automatic switching between version 1 1 and version 1 0 for legacy receiver support FOD levels can be adjusted using external resistors to compensate for application differences to meet Qi certification requirements Smart Power Limiting SPL function to adapt to power limited 5 V supplies Static Power Reduction SPR function to limit power consumption Supports Near Field Communication NFC TAG applications with a delayed start up 1 2 NXQ1TXA5DB1340 demo board features The NXQ1TXA5DB1340 demo board is designed in such a way that it is easy to operate the NXQ1TXA5 device for demonstration and development purposes The demo board is a good starting point for a fully qualified NXQ1TXA5 based application that can be mass produced The demo board contains the following components and features UM10917 NXQ1TXAS integrated wireless power transmitter IC A blue LED serving as power indicator A red and green LED serving as functional user interface indicators Resonant capacitors NPO type which together wit
38. stomer s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars US 5 00 The foregoing limitations exclusions and disclaimers shall apply to the maximum extent permitted by applicable law even if any remedy fails of its essential purpose Translations A non English translated version of a document is for reference only The English version shall prevail in case of any discrepancy between the translated and English versions 10 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners GreenChip is a trademark of NXP Semiconductors N V NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 31 of 32 NXP Semiconductors UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 11 Contents 7 1 7 2 7 3 7 3 1 7 3 2 7 3 3 7 3 4 7 4 7 5 7 5 1 7 5 2 7 5 3 10 10 1 10 2 10 3 11 Introduction 0 00 cece 3 NXQ1TXA5 features 0 0 0 0 0 00000 3 NXQ1TXA5DB1340 demo board features 4 Setup and operation of the NXQ1TXA5DB1340 demo board cece ees 5 NXQ1TXA5DB1340 board overview 5 Conriectors eil ote REX esI 5 Jurmpers aee RR REDE Re ipa mee 6 Configuration and FOD settings
39. the fraction of input power that the NXQ1TXA5 application manages to convert into magnetic energy for transfer to the Qi receiver Typically this efficiency level is approximately 87 However the system efficiency is more important to the end user The system efficiency concerns the efficiency of the whole power chain from the USB input receptacle up to the load battery The typical system efficiency is shown in the gray curve in Figure 8 Typically the system efficiency is approximately 74 when the transmitter and receiver coils are aligned properly 100 aaa 019112 x a 80 2 P 60 o f V 40 20 LL 0 0 1 2 4 Po W 1 TX efficiency RX Pin TX Pin 2 RX efficiency RX Pout RX Pin 3 System efficiency RX Pout TX Pin Fig 8 NXQ1TXA5DB1340 efficiency plots Figure 9 shows the system efficiency plot for a Samsung Galaxy S5 back cover Gi receiver Ref 3 with the NXQ1TXA5DB1340 demo board For this combination the system efficiency is also approximately 74 96 typical UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 20 of 32 NXP Semiconductors UM1 091 T UM10917 NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board aaa 019261 100 n 80 60 40 20
40. tor can be mounted in the X2 position With this connector it is possible to communicate with the NXQ1TXA5 IC via IC Because communication with the NXQ1TXAS IC is outside the scope of this manual no further details are given here The two wire connection X14 can be used to connect a buzzer In that case resistor R34 1 kQ must also be mounted The voltage on the CONFIG pin pin 12 defines the behavior of the buzzer See Section 2 4 and NXQ1TXA5 one chip 5 V Qi wireless transmitter application note Ref 2 UM10917 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2015 All rights reserved User manual Rev 1 3 August 2015 5 of 32 NXP Semiconductors UM1 091 T NXQ1TXA5DB1340 one chip 5 V Qi wireless transmitter demo board 2 3 Jumpers The NXQ1TXA5DB1340 demo board contains two mounting positions for very low ohmic 0805 size jumpers in the 5 V supply section R43 and R44 By default these jumpers are mounted When the jumpers are removed a common mode choke must be mounted in the L3 position The mounted common mode choke offers the opportunity to suppress residual conducted EMI that originates from the NXQ1TXA5 operation However in most applications using the L3 common mode choke is not necessary SPR and SPL can be configured with the solder jumpers in the R30 R31 R32 and R33 position By default R30 and R32 are open and R31 and R33 are closed SPR1 and SPR2 pins
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