User's Manual
Contents
1. FRDMKL25ZUM User s Manual Page 15 of 20 A W freescale Not Used JSDA_PTD5 2 IOREF RESET 3 3V 5V PSV_USB 10 GND GND Vin P5 9V_VIN 16 PTD7 19 PTD6 17 NC 15 PTE31 13 PTA17 11 PTA16 9 PTC17 7 PTC16 5 PTC13 3 PTC12 1 PTC11 15 PTC10 1 PTC6 11 PTCS 9 PTC4 7 PTC3 5 PTCO 3 BT C74 KL25Z Signals Arduino R3 Signals 20 PTE1 18 PTEO 16 VREFH 14 GND 12 PID 10 PTD3 8 PTD2 6 PTDO 4 PTDS 2 PTA13 16 PTC9 14 PICS 12 PTAS 10 PTA4 8 PTA12 6 PTD4 4 PIA 2 PTA1 GC SCL GC SOA AREF GND D13 D12 D11 D10 D9 D8 D7 De D5 D4 D3 D2 D1 DO Refer to the FRDM KL25Z Pinouts spreadsheet for a compatibility chart showing how all the functions of the KL25Z signals on the I O connectors map to the pin functions available on the Arduino Uno R3 FRDMKL25ZUM User s Manual Page 16 of 20 4 A Y gt freescale Appendix A Revision History This appendix describes correction to this user s manual for convenience Grammatical and formatting changes are not listed here unless the meaning of something changed A 1 Changes Between Document Revisions 2 and 1 Table A 1 Changes between revisions 2 and 1 Chapter Description 1 Overview e Updated devices that the FRDM KL25Z can be used to evaluate 4 FRDM KL25Z Hardware e Updated block diagram to reflect Rev E changes to board Overview e Updated P2. I O headers J9 pin 10 Sourced from P5V_USB either the PS5V_KL25Z or PSV_OSDA supply through a back drive protection Schottky diode NOTES 1 By default the linear regulator U1 is a 3 3V output regulator However this is a common footprint that would allow the user to modify the assembly to utilize an alternative device such as a 1 8V or 2 5V regulator The KL25Z microcontroller has an operating range of 1 71V to 3 6V 2 J3 and J4 are not populated by default The two pins of these headers are in parallel with 0 Q resistors In addition J4 is also in parallel with a 10 Q resistor To measure the energy consumption of the KL25Z either a voltmeter or an ammeter may be used To use a voltmeter R73 0 Q must be removed before connecting the voltmeter probes to the pins of J4 Both R73 and R81 10 Q must be removed to measure current with an ammeter For the OpenSDA MCU energy consumption can be measured by removing R74 0 Q and connecting ammeter probes to the pins of J3 3 D12 is bypassed by J20 By default the pins of J20 are shorted together to reduce the voltage drop across D12 To use D12 cut the trace between the pins of J20 4 If a coin cell battery is to be used add a small amount of solder to the coin cell ground pad before adding the battery holder Also it is recommended to populate D7 as a protection diode when using a coin cell battery 5 2 Serial and Debug Adapter OpenSDA OpenSDA is an open standard serial and debu
3. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits based on the information in this document Freescale reserves the right to make changes without further notice to any products herein Freescale makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Freescale 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 consequential or incidental damages Typical parameters that may be provided in Freescale data sheets and or specifications 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 Freescale does not convey any license under its patent rights nor the rights of others Freescale sells products pursuant to standard terms and conditions of sale which can be found at the following address freescale com SalesTermsandConditions Freescale the Freescale logo and Kinetis are trademarks of Freescale Semiconductor Inc Reg U S Pat amp Tm Off ARM is the registered trademark of ARM Limited ARM Cortex M0 is the trademark of ARM Limited All other product or service names are the property of their respective owners 2013 Fr
4. a list of reference documents for the FRDM KL25Z hardware All of these documents are available online at www freescale com FRDM KL25Z Table 1 FRDM KL25Z Reference Documents Filename Description Quick Start Guide and supporting files for getting started with the FRDM KL25Z This document overview and detailed information for the FRDM KL25Z hardware Spreadsheet of pin connections for all MCU pins Includes FRDM KL25Z Pinouts pinout for the I O headers Arduino R3 compatibility chart and OpenSDA MCU pinout PDF schematics for the FRDM KL25Z hardware Rev E and Rev D available Zip file containing all design source files for the FRDM KL25Z hardware Overview and instructions for use of the OpenSDA embedded debug circuit FRDM KL25Z Quick Start Package FRDM KL25Z User s Manual FRDM KL25Z Schematics FRDM KL25Z Design Package OpenSDA User s Guide 3 Getting Started See the FRDM KL25Z Quick Start Package for step by step instructions for getting started with the FRDM KL25Z See the Jump Start Your Design section on www freescale com FRDM KL25Z for the Quick Start Package and software lab guides FRDMKL25ZUM User s Manual Page 3 of 20 ey freescale 4 FRDM KL25Z Hardware Overview The features of the FRDM KL25Z include e MKL25Z128VLK4 in an 80 LQFP package Capacitive touch slider MMA8451Q accelerometer Tri color RGB LED Flexible power supply options USB coin cell battery external
5. other two sources are not regulated on board Table 2 provides the operational details and requirements for the power supplies Table 2 Power Supply Requirements OpenSDA Regulated on Supply S Valid R OpenSDA USB J7 KL25Z USB J5 mm ne Vin Pin 4 3 9V No Yes 3 3V Pin 1 71 3 6V No No Coin Cell Battery 1 71 3 6V No No FRDMKL25ZUM User s Manual Page 5 of 20 u A gt freescale H Note that the OpenSDA circuit is only operational when a USB cable is connected and supplying power to J7 However protection circuitry is in place to allow multiple sources to be powered at once Figure 3 shows the schematic drawing for the power supply inputs and the on board voltage regulator OPTIONAL pe COIN CELL i HOLDER pr DNP D Fa i MBR120VLSFTIG ii 3 L ipava BATT A c ie eet Se K e i a fi DNP P3V3 KL2SZ GND 3008 i 10uF HDR 1X2 TH Sa a PEa VIN PSV_SDA PSV KL25Z Ti lt ka lt D10 D D8 MBRIZ0VLSFTIG MBRI20VLSFTIG MBRI20VLSFTIG aa i a e P MBRI20VLSFTIG p A P59 VIN VA Si u voar Sen VREG A c H a mB a c2 J33 a 10uF Pav2 SDA ZE we E Ne ue HDR 1X2TH T NCP1117ST33T3G J20 O GND alk A ZC DNP 9 20mOhm Resistor HDRIX2TH H in layout i SHORTING HEADER Figure 3 Power Supply Schematic In addition regulated power can be supplied to J3 pin 10 from an external source through P5 9V_VIN by pop
6. 9 PTD7 Note that all pinout data is available in spreadsheet format in FRDM KL25Z Pinouts See the Reference Documents section for details 5 8 Analog Reference Voltage The onboard ADC of the KL25Z128VLK4 MCU uses the Reference Voltage High VREFH and Reference Voltage Low VREFL pins to set high and low voltage references for the analog modules On the FRDM KL25Z by default VREFH is attached to P3V3_KL25Z 3 3V Supply VREFL is connected to GND Figure 10 illustrates this circuitry FRDMKL25ZUM User s Manual Page 14 of 20 u A gt freescale CAD NOTE Please place these capacitors near their respective CPU pin VREFH to VREFL cg and VDDA to VSSA lt x e a 8 8 T sss z n 3 d E ZS gt Figure 10 FRDM KL25Z VREFH Circuit Schematic If desired VREFH can use a VDDA independent reference by adding R77 and a Zener diode D9 R80 0 Q resistor must be removed when implementing this option Alternatively VREFH can be attached to an external source through AREF by removing R80 and populating R3 with a 0 Q resistor 5 9 Arduino Compatibility The I O headers on the FRDM KL25Z are arranged to allow compatibility with peripheral boards known as shields that connect to Arduino and Arduino compatible microcontroller boards The outer rows of pins the even numbered pins on the headers share the same mechanical spacing and placement as the I O headers on the Arduino Revision 3 R3 standard
7. 9 Blue Cathode PTp1 FRDMKL25ZUM User s Manual Page 12 of 20 e e 2 freescale NOTE 1 PTD1 is also connected to the I O header on J2 pin 10 also known as D13 RGB LED FEATURE TP14 TP13 CLV1A FKB CJ1M1F1BB7R4S3 Figure 9 RGB LED Schematic Diagram 5 7 Input Output Connectors The KL25Z128VLK4 microcontroller is packaged in an 80 pin LQFP Some pins are utilized in on board circuitry but many are directly connected to one of four I O headers The pins on the KL25Z microcontroller are named for their general purpose input output port pin function For example the 17 pin on Port A is referred to as PTA1 The I O connector pin names are given the same name as the KL25Z pin connected to it where applicable FRDMKL25ZUM User s Manual Page 13 of 20 u 8 K 2 freescale PTA1 ZE PTC7 PTE30 11 5912 PTC1 PTA2 4 LAJ PTCO 2 10 PTC2 PTD4 6 EES PTC3 8 PTBS PTA12 8 LAJ PTC4 36 PTB2 PTA4 10 EENG PTCS E4 PTBI PTA5 12 EE It PTC6 2 RIDO PTC8 14 LAJM PTC10 16 P5 9V_VIN 14 GND 12 GND 10 P5V_USB 8 P3V3 6 RESET PTA20 4 P3V3 2 SDA_PTDS PTC9 16 bi PTC11 PTAI3 2 KE PTC12 PTD5 4 KE PTCI3 PTDO 6 KAS PTCI6 PTD2 8 KE PTCI7 PTD3 10 KE PTAIG PTD1 12 KE PTAI7 GND 14 ki PI VREFH 16 d 15 NC PTEO 18 Kk kAt PTDG PTE1 20 Sg 1
8. A IW xy gt freescale FRDM KL25Z User s Manual 2013 10 24 Rev 2 0 Freescale Semiconductor Inc FRDMKL25ZUM A A j d gt freescale Table of Contents TL Ce e estgergetregetEeeeegreeh GEERT 3 2 Reference DO CWRICINGS sccircceecnieennrenrindehanutmiinmninieaetiemaenaien 3 3 Getting SUS acest essai cence ececanas eect Dh dase dete catak da vincaua awbnattssdnaededavsdanssventanbdasnnabersinasladinds 3 4 FRDM K KL25Z Hardware Overview wiiccscnsisiassuisssatennncntecnsnssansnnnnnsnsnnnsuanaseseshechussnetanisansnasinansaandniaeannnss 4 5 FRDM KL25Z Hardware Description ss sssssssssusussueussununnunnnunnunnnnnnnununnnnnnnnnannnnunnnnnnnnnnnnnnanannnnnnn anann nna 5 SA Power D Eltere a a aana aa 5 5 2 Serial and Debug Adapter OpenSDA uu EEN EEN 7 RM On EE 8 5 22 Virtual Serial e GE 9 5 3 KL25Z Microcontroller asc ee noes cade SEENEN 9 leede 10 532 USB here 10 S33 EIN Le GE 10 Ee 11 E320 CD DT eA ee leis Pe e Ee 11 5A Capacitive Touch SUG sicsccdicccsscecssesadessesesestesdseediatas eesescchastsaspesnscbstanediataseesnscuacaeesndesasedsdenedielageesecanaseecnteaceeseabeetes 12 5 5 S axis ACCelErOMeter cascnscuihe nati eege 12 1 OIRG BLED i sates ches eccanectisccacecvStaacesitzcdsadsenc dust ated aasstacesusedasebate dante a nae aa a 12 5 7 Input Output OD ECKER eege ae eae asians 13 5 8 Analog Reference Voltage iiion aaa eEE EENS 13 5 9 Arduino Compatibility EE 15 Appendix A Revision Hstuegegreseegieu
9. DA PSV_KL25Z i i D i GND 4 H 10uF SHORTING HEADER i 3003 i P3V3 ON BOTTOM LAYER GND D J4 P3V3_KL25Z mi a HDR 1X2 TH D2 2 TP7 e a BAT54C k E um is jai e D DNP 24 vin vout 2 4 3V3_VREG S 4 c4 O TAB TI oe tour BATS4C NCP1117ST33T3G GND 20mOhm Resistor in layout i GND N Q D BOTTOM LAYER P3V3_SDA HDR 1X2 TH JI kul DNP Fig ure A 1 Power Supply Schematic Rev D Rev D boards do not feature optional USB host functionality They lack J21 and R82 necessary for USB host functionality Rev E has eliminated the solder short found on Rev D boards and replaced it with a 0 Q resistor R80 In addition Rev D boards lack the option of adding a 1 KQ resistor R77 and a 3V Zener diode to the VREFH circuitry FRDMKL25ZUM User s Manual Page 18 of 20 u 8 K 2 freescale P3V3_KL25Z SH1 R3 SOLDER SHORT lt gt gt AREF Go 0 DNP CAD NOTE Please place these capacitors near their respective CPU pin VREFH to VREFL cs and VDDA to VSSA z el ag amp fa T gt g Figure A 2 FRDM KL25Z VREFH Schematic Rev D FRDMKL25ZUM User s Manual Page 19 of 20 How to Reach Us Home Page freescale com Web Support freescale com support Document Number FRDMKL25ZUM Rev 2 0 10 2013 Information in this document is provided solely to enable system and software implementers to use Freescale products
10. eescale Semiconductor Inc a wi oc wi Ei a a u ARM K Z freescale
11. g adapter It bridges serial and debug communications between a USB host and an embedded target processor as shown in Figure 5 The hardware circuit is based on a Freescale Kinetis K20 family microcontroller MCU with 128 KB of embedded flash and an integrated USB controller OpenSDA features a mass storage device MSD bootloader which provides a quick and easy mechanism for loading different OpenSDA Applications such as flash programmers FRDMKL25ZUM User s Manual Page 7 of 20 u 2 freescale run control debug interfaces serial to USB converters and more Refer to the OpenSDA User s Guide for more details OpenSDA OpenSDA MCU K20DX128Vxx5 USB Host MSD Bootloader Target Processor nRESET UART TX RX File System UART RX TX p SPI GPIO SWD JTAG Serial Terminal Application IDE Figure 5 OpenSDA High Level Block Diagram OpenSDA is managed by a Kinetis K20 MCU built on the ARM Cortex M4 core The OpenSDA circuit includes a status LED D4 and a pushbutton SW1 The pushbutton asserts the Reset signal to the KL25Z target MCU It can also be used to place the OpenSDA circuit into Bootloader mode The OpenSDA MCU RESET can be isolated from SW1 by cutting the trace between pins on J14 SPI and GPIO signals provide an interface to the SWD debug port of the KL25Z Additionally signal connections are available to implement a UART serial channel The OpenSDA circuit receives power when the USB connector J7
12. ge GND Figure 7 USB Connector Schematic In order to enable USB host functionality on the FRDM KL25Z it is necessary to populate J21 and R82 as shown in the figure above However there is no electrical protection provided Use the USB host functionality at your own risk 5 3 3 Serial Port The primary serial port interface signals are PTA1 and PTA2 These signals are connected to both the OpenSDA and to the J1 I O connector Note that the OpenSDA connection can be isolated from J1 by removing R5 amp R6 if required 5 3 4 Reset The PTA20 RESET signal on the KL25Z128 is connected externally to a pushbutton SW1 and also to the OpenSDA circuit However J14 has been provided to isolate the OpenSDA MCU from SW1 Isolating the RESET line allows a more accurate measurement of the target device s power consumption in low power modes The reset button can be used to force an external reset event in the target MCU The reset button can also be used to force the OpenSDA circuit into bootloader mode See section 5 2 Serial and Debug Adapter OpenSDA for more details 5 3 5 Debug The sole debug interface on all Kinetis L Series devices is a Serial Wire Debug SWD port The primary controller of this interface on the FRDM KL25Z is the onboard OpenSDA circuit see section 5 2 However an unpopulated 10 pin 0 05 Cortex Debug connector J6 provides access to the SWD FRDMKL25ZUM User s Manual Page 11 of 20 u gt free
13. is plugged into a USB host 5 2 1 Debug Interface Signals with SPI and GPIO capability are used to connect directly to the SWD of the KL25Z These signals are also brought out to a standard 10 pin 0 05 Cortex Debug connector J6 It is possible to isolate the KL25Z MCU from the OpenSDA circuit and use J6 to connect to an off board MCU To accomplish this cut the trace on the bottom side of the PCB that connects J11 pin 1 to J11 pin 2 This will disconnect the SWD_CLK pin to the KL25Z so that it will not interfere with the communications to an off board MCU connected to J6 FRDMKL25ZUM User s Manual Page 8 of 20 u A gt freescale S W D CO N N E CTO R SHORTING HEADER ON BOTTOM LAYER Jumper is shorted by a cut trace Cutting the trace fectively isolate the on board MCU from the OpenSDA debug interface pg 3 4 SWD_DIO_TGTMCU lt gt P3V3_KL25Z gt KL25_SWD_CLK pg 3 DNP HDR 1X2 TH C SWD_CLK_TGTMCU pg 4 lt RST_TGTMCU pg 3 4 5 Figure 6 SWD Debug Connector Note that J6 is not populated by default A Samtec FTSH 105 02 F D or compatible connector can be added to the J6 through hole connector A mating cable such as a Samtec FFSD IDC cable can then be used to connect from the OpenSDA of the FRDM KL25Z to an off board SWD connector 5 2 2 Virtual Serial Port A serial port connection is available between the OpenSDA MCU and pins PTA1 and PTA2 of the KL25Z Several of the defaul
14. odules One low power UART and two standard UART modules e Timers One 6 channel Timer PWM module Two 2 channel Timer PWM modules 2 channel Periodic Interrupt Timer PIT Real time clock RTC Low power Timer LPTMR System tick timer e Human Machine Interfaces HMI General purpose input output controller Capacitive touch sense input interface hardware module 5 3 1 Clock Source The Kinetis KL25 microcontrollers feature an on chip oscillator compatible with three ranges of input crystal or resonator frequencies 32 40 kHz low freq mode 3 8 MHz high freq mode low range and 8 32 MHz high freq mode high range The KL25Z128 on the FRDM KL25Z is clocked from an 8 MHz crystal FRDMKL25ZUM User s Manual Page 10 of 20 A 2 freescale 5 3 2 USB Interface The Kinetis KL25 microcontrollers feature a dual role USB controller with on chip full speed and low speed transceivers The USB interface on the FRDM KL25Z is configured as a full speed USB device J5 is the USB connector for this interface P5V_KL25Z J5 1 CONN USB MINI B 3 P5V0 USB CONN VBUS kor GND 33 USB DN 33 USB_DP OPTIONAL USB HOST FUNCTIONALITY P5V SDA P5V_KL25Z GSOTOSC GS08 J21 HDR 1X2TH DNP TC_USB_ID_TP i POPULATE THESE gt R82 i PARTS FOR USB HOST FUNCTIONALITY 3300HM GND i ELECTRICAL PROTECTION IS NOT PROVIDED KL25Z USB CONNECTOR Use rt ar Your ow u
15. ower Supply Schematic Figure 3 for Rev E board changes e Updated FRDM KL25Z Power Supplies Table 3 to reflect and describe Rev E board changes e Updated Serial and Debug Adapter OpenSDA description 5 2 to reflect Rev E board changes e Updated USB Interface 5 3 2 to include USB Connector schematic and describe the host function configuration e Updated Reset 5 3 4 to discuss OpenSDA MCU isolation from SW1 amp RESET line e Added Analog Ref Voltage 5 8 to describe Rev E board changes to VREFH 5 FRDM KL25Z Hardware Description FRDMKL25ZUM User s Manual Page 17 of 20 A K XY gt freescale A 2 Previous Board Revisions A 2 1 Rev D The following section illustrates the FRDM KL25Z Rev D features that differ from the current board revision Rev E added J14 therefore on Rev D boards the OpenSDA MCU cannot be easily isolated from SW1 and the target MCU s RESET line Rev D board power supplies lack a Shottky diode D10 on the P5 9V_VIN line to U1 J20 to bypass D12 from 3 3V regulator 0 Q resistors in parallel with J3 amp J4 and a 10 Q resistor in parallel with J4 Also BAT54C Shottky diodes are used on Rev D compared to MBR120VLSFT1G diodes used on the current board revision Figure A 1 describes the Rev D power supply in more detail OPTIONAL TPB COIN CELL HOLDER py w i 3 L iP3V3 BATT aT i P5 9V_VIN_ P5V_S
16. scale signals The Samtec FTSH 105 02 F D or compatible connector can be added to the J6 through hole debug connector to allow for an external debug cable to be connected 5 4 Capacitive Touch Slider Two Touch Sense Input TSI signals TSIO_CH9 and TSIO_CH10 are connected to capacitive electrodes configured as a touch slider Freescale s Touch Sense Software TSS provides a software library for implementing the capacitive touch slider 5 5 3 axis Accelerometer A Freescale MMA8451Q low power three axis accelerometer is interfaced through an 1 C bus and two GPIO signals as shown in Table 4 below By default the UC address is Ox1D SAO pulled high Table 4 Accelerometer Signal Connections MMA8451Q _ KL25Z128 SCL PTE24 SDA PTE25 INT1 PTA14 INT2 PTA15 P3v3 P3V3 SR P3V3 G S Gig 0 1UF ll 10uF R16 R18 GND GND 4 7K 4 7K Pava BE uz pg 3 12C0_SCL SCL Q 8 Bin oz Co SDA E SDA a 9 P26 z i MMA8451 SERIAL ADDRO LAN Poe iiti NT1_ACCEL TP23 INT2 11 Ge VIS ACCEL S e MMA8451 BYP 2 ep NC3 3 x 10K p NC8 i3 X o o NC13 5 X DNP JL 0 1UF oO Ncis LJ 222 16 lt GND ogg Net ES MMA8451Q n GND ZP GND Figure 8 MMA8451Q Schematic Diagram Three PWM capable signals are connected to a red green blue LED D3 The signal connections are shown in Table 5 below Table 5 RGB LED Signal Connections RGB LED KL25Z128 Red Cathode PTB18 Green Cathode PTB1
17. seguetegeeg green ENEEeEEEedeENeEECEE tee 16 A 1 Changes Between Document Revisions 2 and 1 16 A 2 Pr6ViOUS Board REVISIONS euer SEENEN iiiad iiin iad EE EE 17 PR ZAM ARO EE 17 FRDMKL25ZUM User s Manual Page 2 of 20 4 A Y gt freescale 1 Overview The Freescale Freedom development platform is a set of software and hardware tools for evaluation and development It is ideal for rapid prototyping of microcontroller based applications The Freescale Freedom KL25Z hardware FRDM KL25Z is a capable and cost effective design featuring a Kinetis L series microcontroller the industry s first microcontroller built on the ARM Cortex MO core FRDM KL25Z can be used to evaluate the KL14 KL15 KL24 amp KL25 Kinetis L series devices It features a KL25Z128VLK a device boasting a max operating frequency of 48MHz 128KB of flash a full speed USB controller and loads of analog and digital peripherals The FRDM KL25Z hardware is form factor compatible with the Arduino R3 pin layout providing a broad range of expansion board options The on board interfaces include an RGB LED a 3 axis digital accelerometer and a capacitive touch slider The FRDM KL25Z is the first hardware platform to feature the Freescale open standard embedded serial and debug adapter known as OpenSDA This circuit offers several options for serial communications flash programming and run control debugging 2 Reference Documents The table below provides
18. source Battery ready power measurement access points Easy access to MCU I O via Arduino R3 compatible UO connectors Programmable OpenSDA debug interface with multiple applications available including Mass storage device flash programming interface P amp E Debug interface provides run control debugging and compatibility with IDE tools CMSIS DAP interface new ARM standard for embedded debug interface Data logging application Figure 1 shows a block diagram of the FRDM KL25Z design The primary components and their placement on the hardware assembly are pointed out in Figure 2 Touch Pad Slider indicates optional items that will not be populated by default Figure 1 FRDM KL25Z Block Diagram FRDMKL25ZUM User s Manual Page 4 of 20 A aX XY gt freescale FRE ee Capacitive Touch Slider KL25Z 80 LQFP J11 O Header J10 I O Header N fei o St x lt DU CH ES i RGB LED J9 I O Header J2 1 O Header MMA8451Q Reset KL25Z USB OpenSDA Figure 2 FRDM KL25Z Feature Call outs 5 FRDM KL25Z Hardware Description 5 1 Power Supply There are multiple power supply options on the FRDM KL25Z It can be powered from either of the USB connectors the Vn pin on the I O header an on board coin cell battery or an off board 1 71 3 6V supply from the 3 3V pin on the I O header The USB and Vn supplies are regulated on board using a 3 3V linear regulator to produce the main power supply The
19. t OpenSDA Applications provided by Freescale including the MSD Flash Programmer and the P amp E Debug Application provide a USB Communications Device Class CDC interface that bridges serial communications between the USB host and this serial interface on the KL25Z 5 3 KL25Z Microcontroller The target microcontroller of the FRDM KL25Z is the KL25Z128VLK4 a Kinetis L series device in an 80 LQFP package The KL25Z MCU features include e 32 bit ARM Cortex M0 core up to 48 MHz operation Single cycle fast I O access port e Memories 128 KB flash 16 KB SRAM e System integration Power management and mode controllers Low leakage wakeup unit Bit manipulation engine for read modify write peripheral operations Direct memory access DMA controller Computer operating properly COP Watchdog timer e Clocks Clock generation module with FLL and PLL for system and CPU clock generation 4 MHz and 32 kHz internal reference clock System oscillator supporting external crystal or resonator Low power 1kHz RC oscillator for RTC and COP watchdog e Analog peripherals FRDMKL25ZUM User s Manual Page 9 of 20 u gt freescale 16 bit SAR ADC w DMA support 12 bit DAC w DMA support High speed comparator e Communication peripherals Two 8 bit Serial Peripheral Interfaces SPI USB dual role controller with built in FS LS transceiver USB voltage regulator Two IC m
20. ulating the board with an optional voltage regulator e g a 7805 style regulator in a TO 220 package thus providing a high current supply to external devices To prevent voltage sag under high load C23 C24 C25 amp C28 should be populated with appropriately sized capacitors to match the regulator actually chosen See Figure 4 Figure 4 Optional Voltage Regulator Schematic FRDMKL25ZUM User s Manual Page 6 of 20 4 A4 Y freescale Table 3 FRDM KL25Z Power Supplies Power Supply Name P5 9V_VIN Power supplied from the Vu pin of the I O headers J9 pin 16 Power supplied from the OpenSDA USB connector J7 A Schottky E diode provides back drive protection Power supplied from the KL25Z USB connector J5 A Schottky diode P5V_KL25Z E provides back drive protection Regulated 3 3V supply Sources power to the P3V3 supply rail with an P3V3_VREG S 1 3 optional back drive protection Schottky diode P3V3 BATT Coin cell battery supply voltage Sources power to the P3V3 supply rail with the option of adding a back drive protection Schottky diode paus Main supply rail for the FRDM KL25Z assembly May be sourced from P3V3_VREG P3V3_BATT or directly from the I O headers J9 pin 8 P3V3_KL25Z KL25Z MCU supply Header Ge a EEN means for energy consumption measurements P3V3_ SDA OpenSDA circuit supply Header J3 provides a convenient means for energy consumption measurements Nominal 5V supplied to the
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