NCV7471 System Basis Chip Evaluation Board User`s Manual
Contents
1. would be typically connected to the VS pin or might be taken from other nodes like e g the DC DC converter s auxiliary node V MID VS VOUT2 soldering strap allows connecting VOUT2 LDO input supply to the VS or the V MID point After a power up or a reset event as well as in Sleep mode VOUT2 regulator is switched off In Start up Normal Standby and Flash modes it can be freely activated or deactivated via SPI control register Operating States NCV7471 provides five static operating modes and three transition states see Figure 5 Mode setting is done via SPI registers Additional details of the NCV7471 operation and parameters can be found in the corresponding datasheet 1 http onsemi com 6 NCV7471 EVB wake up or thermal shut down recovery FAIL SAFE VOUT off VOUT2 off Failure Any Watchdog off Event mode RSTN Low UVN VOUT Low SPI off CAN LINx WU wake up except thermal shutdown SLEEP VOUT off VOUT2 off Watchdog off RSTN Low UVN VOUT Low SPI off CAN LINx per SPI WD service OK if enabled STANDBY VOUT on VOUT2 per SPI Watchdog time out off cyclic wake RSTN High UVN_VOUT UV indication SPI on CAN LINx per SPI Any Mode with VOUT Active SPI VD service OK SPI SPI FLASH VOUT on VOUT2 per SPI Watchdog time out RSTN High UVN VOUT UV i2. integrated boost buck DC DC converter delivering a 5 V output VOUT The converter can work in two modes Buck only mode is the default mode of the VOUT power supply In this mode the boosting part of the converter is never activated and the resulting VOUT voltage can be only lower than the input line voltage Buck only mode is applied during the initial power up after the VS connection wakeup from Sleep mode and also recovery from the Fail safe mode as well as in the Software Development Mode with CFG pin at Low level Boost buck mode ensures that the correct VOUT voltage is generated even if the input line voltage falls below the required VOUT level This mode can be requested through the corresponding SPI control register If selected the boost buck mode is used during Reset Start up Normal Standby and Flash modes It is also preserved during VOUT under voltage recovery through Power up mode In SW Development configuration boost buck mode can be additionally enabled by High level on CFG pin No SPI communication is therefore necessary to select the DC DC mode in SW Development see Table 5 Table 5 CONTROL OF DC DC CONVERTER MODES X means Don t care Device SPI bit en CFG Pin Applied DC DC Configuration BOOST Signal Mode Config 1 2 3 4 Buck Only X SW Development Low Buck Only By default the converter works with a fixed switching frequency 485 kHz nominal Through the SPI settings a s
3. 1 2 transceiver is configured into LIN Normal converter LIN and CAN operation NCV7471 may work in AN AGE AE emo e enabled so called Software Development Mode SWDM To configure NCV7471 into this mode SWDM pin has to be tight to VS Details about board configuration can be found in the following chapter Behavior of NCV7174 in Software Development mode is e Watchdog does not need to be served the device remains in Normal mode until it is changed via SPI command RSTN INTN VOUT_UVN FSO1 3 provide their following standard functionality except of RSTN and FSO1 3 e Buck converter is active delivering 5 V on VOUT pins which are not active due to not serving the e Boost converter may be disabled enabled by connecting WalCnOOe CFG pin to GND VS positions of CFG Board Configuration soldering strap The NCV7471 evaluation board provides few hardware e VOUT2 LDO is disabled by default configuration options using soldering straps Their functions are described in the table below Table 3 SOLDERING STRAPS FUNCTIONS or not connected Normal operation mode with external MCU connected Watchdog service needed GND Software Development Mode Watchdog does not need to be served CAN and LIN1 2 ne enabled in Normal mode by default or not connected SWDM GND Config2 4 Fail safe mode entered after 1S 2 4 watchdog service failure GND SWDM VS Boost stage disabled SWDM GND Config1 3 Fail sa
4. 5 11 2012 Semiconductor 2460 mil 1860 Cmi Da Figure 6 NCV7471 EVB PCB Top Assembly Drawing Figure 7 NCV7471 EVB PCB Bottom Assembly Drawing bottom view Composite Drawings wre Te 2460 mil T oToToTaTaToTaTOTOTOTO Q e p 3 s e p e 8 _ 1860 Cmi daa Figure 8 NCV7471 EVB PCB Top Composite Drawing Figure 9 NCV7471 EVB PCB Bottom Composite Drawing bottom view http onsemi com 8 NCV7471 EVB References 1 On Semiconductor NCV7471 Product Datasheet Rev 2 September 2013 2 On Semiconductor NCV7471 Application Note 10 8 September 2013 ON Semiconductor and ON are registered trademarks of Semiconductor Components Industries LLC SCILLC SCILLC owns the rights to a number of patents trademarks copyrights trade secrets and other intellectual property A listing of SCILLC s product patent coverage may be accessed at www onsemi com site pdf Patent Marking pdf SCILLC reserves the right to make changes without further notice to any products herein SCILLC makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does SCILLC assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation special consequential or incidental damages Typical parameters which may be provided in SCILLC data sheets and or specifi
5. Cmid 1UF 1206 50V vs 1UF 1206 50V a R RSTN R ININ R UVN am Z Cin buff Cmid buff f LED FSO i i i Ul 100UF 50V a HSMH C191 3x470R 0603 NCV7471 Optional 100UF 50V RSTN 1 Gory er a R FSO O NN paaa 4 7K 0805 Dbuck MBRS2040L VOUT 7 Bes C Lbuck 10UH or 22UH ExDC 14 Cout 4 Cout com TxDLI 15 N GND GND GND RxDLI 16 ar 2x 10UF 1206 10V 2 2UF 1206 50v TxDI2 17 kapag mea COU RxD12 18 2 ae R CANL VS f 2 1 62R 1206 Ik CAN SWDM 10 VOUT fi VOUT212 TxDC_13 GND1 GND2 SCOPEGND SCOPEGND LE le GND GND GND GND vg VS 4 7NF 0603 50V A GND R SWDM 10K_0603 NZ D LIN2 D INI RA4003T3 MRA4003T3 R_LIN2 R LINI 1 0K 1206 1 0K 1206 HI VOUT LIN1 VOUT RSTN E LIN2 ININ p UVN C WU wave T SDI SDI 10NF 0603 50V C LIN2 C LINI SCK GND GND GND LONE 0603 50 LNE 0603 sov S SW WU 33K 0603 4b pa a Z DD i O OW iD PU SDO SW PB SMD 4 5X4 5MM GND GND CSN xDC TxDC R RDC RDC Pi oil xDL1 TxDL1 non a RD RDL nga La O TOL La Be DI m NOTES D KD D W Pi 2 sane SO FSO Assembly options N2 LN2 GND 19 Pa AI NA 250mA VS533V 500mA VS725V ANH CANH Lboost 3 3uH 0 77A Lboost 10uH 1 3A WU Vbat Lbuck 10uH 0 5A Lbuck 22uH0 9A Ei Ya Cmid not used Rmid OR Cmid luF Rmid 5R6 Cout not used Cout 10uF DOD GG AO PD MW Figure 2 NCV7471 Evaluation Board Schematic http
6. NCV7471 EVB NCV7471 System Basis Chip Evaluation Board User s Manual Introduction This document describes the NCV7471 EVB board for the ON Semiconductor NCV7471 System basis chip with a high speed CAN and two LIN transceivers with boost buck converter and low drop voltage regulator The functionality and major parameters can be evaluated with the NCV7471 EVB board NCV7471 is a System Basis Chip SBC integrating functions typically found in automotive Electronic Control Units ECUs in the body domain NCV7471 provides and monitors the low voltage power supplies for the application microcontroller and other loads monitors the application software via a watchdog and includes high speed CAN and LIN transceivers allowing the ECU to host multiple communication nodes or to act as a gateway unit The on chip state controller ensures safe power up sequence and supports low power modes with a configurable set of features including wakeup from the communication buses or by a local digital signal WU The status of several NCV7471 internal blocks can be read by the microcontroller through the serial peripheral interface or can be used to generate an interrupt request saa NCU 7471 EUB U2 zE ya mes 15 11 2012 LED uang N semiconductor LED_UUN Cmd_ butt ON Semiconductor http onsemi com EVAL BOARD USER S MANUAL Evaluation Board Features e One row Pin Header Providing the Circuit Signals Enables Easy Insertio
7. cations can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts SCILLC does not convey any license under its patent rights nor the rights of others SCILLC products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application Buyer shall indemnify and hold SCILLC and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part SCILLC is an Equal Opportunity Affirmative Action Employer This literature is subject to all applicable copyright laws and is not for resale in any manner PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT N American Technical Support 800 282 9855 Toll Free ON Semiconductor Website www onsemi co
8. fe mode not entered after 15 2 watchdog service VS failure SWDM VS Boost stage enabled VS_VOUT2 VS Input of VOUT2 LDO regulator connected to VS VMID Input of VOUT2 LDO regulator connected to V_MID FSO1 3 FSO1 FSO constantly Low at failure FSO2 FSO Low for 50 frequency of 1 25 Hz at failure FSO3 FSO Low for 20 frequency of 100 Hz at failure Special care has to be taken for Standby or Sleep mode stage enabled To measure pure NCV7471 consumption quiescent consumption measurements Both SWDM and these pins should stay Low GND or may be pulled up by CFG pins have internal pull down resistors typ 100 kQ external voltage source which influence input supply current if they are connected Four on board LEDs indicate faulty states of the board as to VS typically Software Development Mode with Boost described in the Table 4 http onsemi com 4 NCV7471 EVB Table 4 LED FUNCTIONS ooh a LED RSTN Indicates activation of RSTN pin due to the following reasons e Sleep Fail safe mode LED RSTN off due to missing VOUT supply e Reset mode internal or external activation 5 ms on LED INTN Indicates activation of INTN pin due to the following reasons e Sleep Fail safe mode LED INTN off due to missing VOUT supply e Wake up event CAN LIN1 2 WU Timer configurable via SPI e Interrupt request has to be enabled via SPI 1 ms on 5 ms off LED UVN Indicates activation of VOUT UVN pin due to the following reaso
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10. n of the Evaluation Board into a more Complex Application Setup e Oscilloscope Test points on All Important Signals e Reverse Protection and Decoupling on the Main Battery Supply All the Necessary VOUT Converter External Components Assembly Options Available e Decoupling on VOUT Converter and VOUT2 Regulator Outputs e Additional Pull up Resistors on the Open drain Digital Outputs RSTN INTN UVN_ VOUT Filtering Circuit on the Switch monitoring WAKE Input On board Local Wakeup Switch e CAN LIN bus Terminations Good Thermal Connection of the Circuit s Exposed Pad to the Bottom Ground Plane Basic Standalone Functionality using Software Development Mode R LINI CE i OLIN a Figure 1 Evaluation Board Photo Semiconductor Components Industries LLC 2014 February 2014 Rev 1 Publication Order Number EVBUM2219 D NCV7471 EVB SCHEMATIC Complete schematic with all the assembly options are customized according to specific requirements Equations shown in Figure 2 Depending on VOUT maximum current with example calculations can be found in the application and minimum battery operation voltage few assembly note 2 options are available Values of components may be Cmid t VS Vbat 1UF 1206 50V VS VOUT24 Drev GNDF dj MBRS2040 LED RSTN LED ININ LED UVN Rmid t HSMH C191 HSMH C191 HSMH C191 5 6R 0805 or VOUT VOUT VOUT 0 0R 0805 C a Cin NDH H GND X X
11. ndication SPI on CAN LINx per SPI NORMAL VOUT on VOUT2 per SPI Watchdog window time out RSTN High UVN_VOUT UV indication SPI on CAN LINx per SPI START UP VOUT on SPI VOUT2 per SPI Watchdog time out WD service OK RSTN High UVN_VOUT UV indication SPI on PD20110512 01 CAN LINx per SPI normal in SWD configuration ER Es RESET z D start timer t VOUT reset 5 T VOUT on VOUT2 off Watchdog off RSTN Low Flash mode SPI request t VOUT reset elapsed SHUT DOWN VOUT off VOUT2 off Watchdog off RSTN Low UVN VOUT Low SPI off CAN LINx off V MID lt V MID PORL V_MID gt V MID PORH SPI CONFIGURATION read and store SWDMN pin state read and store CFG pin state VOUT off wake up POWER UP VOUT on VOUT2 off Watchdog off RSTN Low UVN_VOUT Low UV indication SPI off CAN LINx off VOUT lt VOUT_RESx After Flash SPI request VOUT gt VOUT_RESx UVN_VOUT UV indication SPI off CAN LINx off O oYcslfopy ge Oo l O p O O 0 ol Z l S oo sal EF 0 gt c o O O SIKO O amp pes c c tS Figure 5 NCV7471 State Diagram http onsemi com 7 NCV7471 EVB PCB DRAWINGS Assembly Drawings NCU7471 EVB V2 ok 1
12. ns e Sleep Fail safe mode LED UVN off due to missing VOUT supply e Undervoltage on VOUT pin VOUT lt 4 65 V LED FSO FSOx pin active due to failure condition depends on CFG and SPI configuration e Thermal Shutdown e Fatal VOUT failure e RSTN clamped Low High e Watchdog failure ignored if SWDM is High e SPI control bit FSO ON is set External Board Connections For basic evaluation the board may operate without Configuration with and without the control MCU is external control in the Software Development Mode shown in the figures below SWDM and CFG soldering Figure 3 If full functionality is needed an external straps need to be configured to work correctly in both setups microcontroller has to be attached to the board Figure 4 O NCU7471 EVB U2 Sm Gumana re Ka EVB U2 LEJ Ei CAN LIN1 LIN2 FSO electronic GND GND VBAT tit VBAT Gp at HI LIN1 g LIN i LIN2 LIN2 Figure 3 Standalone NCV7471 Evaluation Setup Figure 4 NCV 7471 Full Evaluation Setup Software Development Mode used limited functionality http onsemi com 5 NCV7471 EVB FUNCTIONAL DESCRIPTION VS Supply Input VS pin of NCV7471 is typically connected to the car battery through a reverse protection diode and can be exposed to all relevant automotive disturbances ISO7637 pulses system ESD VS supplies mainly the integrated LIN transceivers VOUT DC DC Converter The main application low voltage supply is provided by an
13. onsemi com 2 NCV7471 EVB Table 1 ABSOLUTE MAXIMUM RATINGS DO atng TO eg ln dm CO Yd Voran O a mk sa ee VOUT2 output current VOUT2 output current current s vOUT2 S internally limited internally limited Digital inputs voltage es ANAN INTN UVN SDI SCK CSN TxDC TxDL1 2 Paname ROO ROL a vm Pomme OC a a O o e Stresses exceeding those listed in the Maximum Ratings table may damage the device If any of these limits are exceeded device functionality should not be assumed damage may occur and reliability may be affected Table 2 RECOMMENDED BOARD OPERATING CONDITIONS O fe TO eme wo dm vouToupaewen ft ver to aso mA omorder ha ta lv CHU a f o Digital inputs voltage RSTN INTN UVN SDI SCK CSN TxDC TxDL1 2 Paame TI moron loo o v Fomm Tm oc flo tw lv nemese Ttmrr o Ter CE if ANCAP CO TV momma fC esa empeawe PSs Functional operation above the stresses listed in the Recommended Operating Ranges is not implied Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability See assembly options http onsemi com 3 NCV7471 EVB OPERATIONAL GUIDELINES NCV7471 is complex SCB device which needs external e CAN transceiver is configured into LIN Normal mode MCU connected through H1 connector to control all receiver and transmitter are enabled functions and settings However with basic function of the o LIN
14. witching frequency modulation can be applied with fixed modulation frequency of 10 kHz and three SPI selectable modulation depth values 10 20 or 30 of the nominal frequency VOUT level is monitored by an under voltage detector with multiple thresholds e Comparison with selectable threshold VOUT_RESx By default the lowest threshold typ 3 1 V applies for the state machine control and the activation of the RSTN signal LED_RSTN on This reset threshold can be changed via SPI to any of the four programmable values A second monitoring signal UVN VOUT LED UVN on is generated based on comparison of the VOUT level with the highest monitoring level typ 4 65 V e VOUT is compared with a fixed threshold VOUT FAIL typ 2 V If VOUT stays below VOUT FAIL level for longer than t VOUT powerup typ 1 5 s a VOUT short circuit is detected and Fail safe mode is entered LED FSO on if connected Both UVN_VOUT and RSTN pins provide an open drain output with integrated pull up resistor The split between reset generating level VOUT_RESx and an under voltage indication allows coping with VOUT dips in case of high loads coinciding with low input line voltages VOUT2 Low drop Regulator An integrated low drop regulator provides a second 5 V supply VOUT to external loads typically sensors The regulator s input is taken from a dedicated pin VS_VOUT2 which does not feature an explicit under voltage monitoring VS VOUT
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