FRDM-K20D50M User`s Manual
Contents
1. ey 2 freescale semiconductor FRDM K20D50M User s Manual FRDM K20D50M UM Rev 1 0 Freescale Semiconductor Inc Microcontroller Solutions Group e eo oe 7 freescale semiconductor Table of Contents 1 ERDM K20D5OMOYELYIEW ca NAAANINAG ANA 3 2 References DOCUMENTS BABA 4 3 Getting sanam 4 4 FRDM K20D50M Hardwar Overview ou scsscscssssessseeeeeeececseenaneeeeeeseseseeeenavaeeeeesesaenesenansnseneseeaeeesananaes 4 5 FRDM K20D50M Hardware Description eese ente tnen enata nte ta tn tn anat n tna ta tata ns 8 5 1 1 Oen SUDD NT nananana 5 1 2 Serial and Debug Adapter OpenSDA Sla OCE SOECES NN nano ananasono ft E 5 1 4 USB Interface 5 1 5 Serial Port 5 1 6 Reset 5 1 7 Debug e o o A naawa nna 5 1 8 Capacitive Touch Slider 5 1 9 3 axis Accelerometer 5 1 10 RGB LED o na 5 1 11 Visible light sensor fmm cnn ennt nnnm tttm aket nuna mn 5 1 1 Temperature sensor 5 1 2 Input Output Connectors 5 1 3 Arduino Compatibility Freescale Semiconductor Inc FRDM K20D50MUM Page 2 of 18 2 freescale semiconductor 1 FRDM K20D50M 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 K20D50M hardware FRDM K20D50M2. provides access to the SWD signals The Samtec FTSH 105 02 F D or compatible connectors can be added to the J6 through hole debug connector to allow for an external debug cable to be connected 5 1 8 Capacitive Touch Slider Two Touch Sense Input TSI signals TSIO CH11 PTB18 and TSIO CH12 PTB19 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 1 9 3 axis Accelerometer A Freescale MMA8451Q low power three axis accelerometer is interfaced through an I2C bus and two GPIO signals as shown in Table 4 below By default the I2C address is OX1D SAO pulled high Freescale Semiconductor Inc FRDM K20D50MUM Page 14 of 18 e freescale semiconductor Table 4 Accelerometer Signal Connections MMA8451Q K20D50M SCL PTBO SDA PTB1 INT1 PTC11 INT2 PTC6 5 1 10 RGB LED 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 K20 Red Cathode D6 PTC3 FTMO CH2 Green Cathode D3 PTD4 FTMO CH4 Blue Cathode D9 PTA2 FTMO CH7 LED FEATURE TP14 TP13 LEDRGB RED 1 4 LEDRGB GREEN R7 320 Sa D3 2 PIE 3 LEDRGB BLUE 330 Na DI TP17 CLV1A FKB CJ1M1F1BB7R4S3 Freescale Semiconductor Inc FRDM K20D50MUM Page 15 of 18
3. years after launch 5 1 3 Clock source The Kinetis K 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 FRDM K20D50M is clocked from an 8 MHz crystal Freescale Semiconductor Inc FRDM K20D50MUM Page 13 of 18 e e a 27 freescale semiconductor 5 1 4 USB Interface The Kinetis K microcontrollers feature a dual role USB controller with on chip full speed and low speed transceivers The USB interface on the FRDM K20D50M is configured as a full speed USB device VREGIN must be powered to enable the internal circuitry of USB by jumper J7 5 1 5 Serial Port The primary serial port interface signals are PTBO UARTO RX and PTB17 UARTO TX These signals are connected the OpenSDA 5 1 6 Reset The RESET signal on the K20 is connected externally to a pushbutton SW1 and also to the OpenSDA circuit 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 Please refer to section 5 2 Serial and Debug Adapter OpenSDA for more details 5 1 7 Debug The MK20DX128VLH5 supports JTAG and SWD debug interface however only SWD debug interface is available on FRM K20D50M board However an unpopulated 10 pin 0 05 Cortex Debug connector J6
4. 16 bit analog to digital converter ADC low power touch sensing interface and several general timing communication and control peripherals Feature Description Freescale Semiconductor Inc FRDM K20D50MUM Page 11 of 18 e eo oe 7 freescale semiconductor Ultra low power 11 low power modes with power and clock gating for optimal peripheral activity and recovery times Stop currents of 190 nA VLLSO run currents of 280 uA MHz 4 us wake up from Stop mode Full memory and analog operation down to 1 71V for extended battery life Low leakage wake up unit with up to eight internal modules and sixteen pins as wake up sources in low leakage stop LLS very low leakage stop VLLS modes Low power timer for continual system operation in reduced power states Flash SRAM and FlexMemory 32 KB 128 KB flash featuring fast access times high reliability and four levels of security protection 16 KB of SRAM 2 KB of FlexMemory user segmentable byte write erase EEPROM for data tables system data EEPROM with over 10M cycles and flash with 70 usec write time brownouts without data loss or corruption No user or system intervention to complete programming and erase functions and full operation down to 1 71V FlexNVM adds up 32 KB for extra program code data or EEPROM backup Mixed signal capability High speed 16 bit ADC with configurable resolution Single or differential output modes for impr
5. 7 freescale semiconductor 5 1 11 Visible light sensor The FRDM K20D50M has a visible light sensor that is connected to ADCO DMO VISIBLE LIGHT SENSOR SHORTING HEADER ON BOTTOM LAYER J12 P3V3 HDR 1X2 TH SNS LIGHT ADC lt gt gt ADCO_DMO pg 3 5 DNP Q1 ALS PT19 315C L177 TR8 5 1 1 Temperature sensor FRDM K20D50M is prepared for an external temperature sensor BD1020HFV TR connected to ADCO DM3 Note this sensor is not populated on the board Freescale Semiconductor Inc FRDM K20D50MUM Page 16 of 18 e oe oe 7 freescale semiconductor 5 1 2 Input Output Connectors The K20DX128VLH5 microcontroller is packaged in an 64 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 K20 microcontroller are named for their general purpose input output port pin function For example the 1st pin on Port A is referred to as PTA1 The I O connector pin names are given the same name as the K20 pin connected to it where applicable J19 J10 PTE1 2 1 PTDO PTEO 4 3 PTC11 ADCO DMO 11 12 PTBO PTAS 6 5 PTC5 ADCO DPO 9 10 PTB1 PTD4 8 7 PTC6 ADCO_DM3 7 8 PTD5 PTC8 10 9 PTC7 ADCO DP3 5 6 PTD6 PTA1 12 11 PTA4 CMP1 IN3 3 4 PTC1 PTC3 14 13 PTD7 CMPO I
6. N5 1 2 PTCO PTC4 16 15 PTC9 2 PTA12 2 1 PTA13 PTA2 4 3 PTC10 15 16 P5 9V_VIN PTC2 6 5 13 14 GND PTD2 8 7 11 12 GND PTD3 10 9 9 10 P5V_USB PTD1 12 11 7 8 P3V3 GND 14 13 5 6 RST_TGTMCU VREFH 16 15 3 4 P3V3 PTB3 18 17 1 2 SDA_PTD5 PTB2 20 19 Freescale Semiconductor Inc FRDM K20D50MUM Page 17 of 18 e amp a 7 freescale semiconductor 5 1 3 Arduino Compatibility The I O headers on the FRDM K20D50M 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 Freescale Semiconductor Inc FRDM K20D50MUM Page 18 of 18
7. fectively isolate the on board MCU from the OpenSDA debug interface pg 3 4 SWD DIO TGTMCU lt gt P3V9 KL257 gt gt KL25 SWD CLK pg 3 lt SWD CLK TGTMCU pg 4 lt RST TGTMCU pg 3 4 5 GND 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 K20D50M to an off board SWD connector Virtual Serial Port A serial port connection is available between the OpenSDA MCU and pins PTA1 and PTA2 of the K20 Several of the default 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 K20 5 3 K20D50M Microcontroller The target microcontroller of the FRDM K20D50M is the MK20DX128VLH5 this is 50 MHz entry level K20 USB microcontrollers MCUs are the lowest power Kinetis ARM Cortex M4 devices with high feature integration in a small form factor making them ideal for space and cost constrained applications These MCUs offer 32 KB to 128 KB of flash memory and optional 32 KB of FlexNVM in 32 pin QFN 5 mm x 5 mm to 64 pin LQFP packages Peripheral options include full speed USB Device Host On The Go with device charge detect capability a
8. is a simple yet sophisticated design featuring a Kinetis K series microcontroller The K family microcontroller built on the ARM Cortex M4 core with DSP capabilities FRDM K20D50M features a K20DX128VLH5 this device boasting a max operating frequency of SOMHz 128KB of flash a full speed USB controller and loads of analog and digital peripherals The FRDM K20D50M 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 and ambient light sensor The FRDM K20D50M features 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 Figure 1 Freescale FRDM K20D50M Overview Freescale Semiconductor Inc FRDM K20D50MUM Page 3 of 18 e eo oe 7 freescale semiconductor Contents The TWR K20D50M contents include e TWR K20D50M board assembly e 3ft Ato mini B USB cable for debug interface serial communication and power e Quick Reference card 2 References documents The table below provides a list of reference documents for the FRDM K20D50M hardware All of these documents are available online at www freescale com FRDM K20D50M Table 1 FRDM K20D50M Reference Documents Filename Description FRDM K20D50M Quick S
9. low power modes minimum current adder when enabled TSI hardware implementation avoids software polling methods High sensitivity level allows use of overlay surfaces up to 5 mm thick Connectivity and Full Speed USB Device Host On The Go with device charge detect capability Communications Optimized charging current time for portable USB devices enabling longer battery life USB low voltage regulator supplies up to 120 mA off chip at 3 3 volts to power external components from 5 volt input Three UARTs one UART supports RS232 with flow control RS485 ISO7816 and IrDA while the other two UARTS support RS232 with flow control and RS485 One Inter IC Sound 125 serial interface for audio system interfacing One DSPI module and one I2C module Reliability Safety and Memory protection unit provides memory protection for all masters on the Security cross bar switch increasing software reliability Cyclic redundancy check CRC engine validates memory contents and communication data increasing system reliability Independent clocked computer operating properly COP guards against clock skew or code runaway for fail safe applications such as the IEC 60730 safety standard for household appliances External watchdog monitor drives output pin to safe state for external components in the event that a watchdog timeout occurs This product is included in Freescale s product longevity program with assured supply for a minimum of 10
10. n SW1 The pushbutton asserts the Reset signal to the K20D128 target MCU It can also be used to place the OpenSDA circuit into Bootloader mode SPI and GPIO signals provide an interface to either the SWD debug port of the K20 Additionally signal connections are available to implement a UART serial channel The OpenSDA circuit receives power when the USB connector J7 is plugged into a USB host Debug Interface Signals with SPI and GPIO capability are used to connect directly to the SWD of the K20 These signals are also brought out to a standard 10 pin 0 05 Cortex Debug connector J6 It is possible to isolate the K20 MCU from the OpenSDA circuit and use J6 to connect to an off board MCU To Signals with SPI and GPIO capability are used to connect directly to the SWD of the K20 These signals are also brought out to a standard 10 pin 0 05 Cortex Debug connector J6 It is possible to isolate the K20 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 K20 so that it will not interfere with the communications to an off board MCU connected to J6 Freescale Semiconductor Inc FRDM K20D50MUM Page 10 of 18 e amp Pg 7 freescale semiconductor SWD CONNECTOR SHORTING HEADER ON BOTTOM LAYER Jumper is shorted by a cut trace on bottom layer Cutting the trace will ef
11. 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 Vin supplies are regulated on board using a 3 3V linear regulator to produce the main power supply The other two sources are not regulated on board Table 2 provides the operational details and requirements for the power supplies Supply Source Valid Range OpenSDA Regulated on Operational board OpenSDA USB 5V Yes Yes K20 USB 5V No Yes Vin Pin 4 3 9V No Yes 3 3V Pin 1 71 3 6V No No Coin Cell 1 71 3 6V No No Battery Note that the OpenSDA circuit is only operational when a USB cable is connected and supplying power to OpenSDA USB However protection circuitry is in place to allow multiple sources to be powered at once P5 9V VIN MBRI20VLSFTIG 4 c D2 MBR120VLSFT1G P5V SDA P5V K20D50M MBRI20VLSFTIG O o P amp 9V VIN VR 3 oO WF GND NCP11178T38T86 7 OPTIONAL TPS COIN CELL HOLDER py pi MBRI20VLSFTIG PW3 3 A C C GND ai Ka ur e oNP GND D1 MBR120VLSFT1G A c J20 DNP m ON E B P3V3 SDA HDR 1X2 TH Freescale Semiconductor Inc FRDM K20D50MUM Page 8 of 18 e eo oe 7 freescale semiconductor FRDM K20D50M Power Supplies Power Supply Name Description P5 9V VIN Power supplied from the Vin pin of the I O headers J9 pin 16 A Schottky diode pro
12. oved noise rejection 500 ns conversion time achievable with programmable delay block triggering Two high speed comparators providing fast and accurate motor over current protection by driving PWMs to a safe state Optional analog voltage reference provides an accurate reference to analog blocks and replaces external voltage references to reduce system cost Performance 50 MHz ARM Cortex M4 core with DSP instruction set single cycle MAC and single instruction multiple data SIMD extensions Up to four channel DMA for peripheral and memory servicing with reduced CPU loading and faster system throughput Cross bar switch enables concurrent multi master bus accesses increasing bus bandwidth Independent flash banks allowing concurrent code execution and firmware updating with no performance degradation or complex coding routines Freescale Semiconductor Inc FRDM K20D50MUM Page 12 of 18 e eo oe 7 freescale semiconductor Timing and Control Two FlexTimers with a total of 10 channels Hardware dead time insertion and quadrature decoding for motor control Carrier modulator timer for infrared waveform generation in remote control applications Four channel 32 bit periodic interrupt timer provides time base for RTOS task scheduler or trigger source for ADC conversion and programmable delay block Human Machine Hardware touch sensing interface TSI with up to 16 inputs Interface TSI operates in
13. r by a trace on the bottom layer of the PCB To measure the energy consumption of either the K20 or the OpenSDA MCU the trace between these pins must first be cut A current probe or a shunt resistor and voltage meter can then be applied to measure the energy consumption on these rails Freescale Semiconductor Inc FRDM K20D50MUM Page 9 of 18 P o o 7 freescale semiconductor 5 1 2 Serial and Debug Adapter OpenSDA OpenSDA is an open standard serial and debug adapter It bridges serial and debug communications between a USB host and an embedded target processor as shown in Figure 4 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 run control debug interfaces serial to USB converters and more Refer to the OpenSDA User s Guide for more details OpenSDA OpenSDA MC K20DX128Vxx5 USB Host MSD Bootloader Target Processor GPIO ADC UART TX RX File System OpenSDA SPI GPIO Serial Terminal Application IDE nRESET UART RX TX SWD JTAG OpenSDA High Level Block Diagram OpenSDA is managed by another Kinetis K20 MCU built on the ARM Cortex M4 core The OpenSDA circuit includes a status LED D4 and a pushbutto
14. tart Quick Start Guide and supporting files for getting started with Package the FRDM K20D50M FRDM K20D50M User s Manual This document overview and detailed information for the FRDM K20D50M hardware FRDM K20D50M Pinouts Spreadsheet of pin connections for all MCU pins Includes pinout for the I O headers Arduino R3 compatibility chart and OpenSDA MCU pinout FRDM K20D50M Schematics PDF schematics for the FRDM K20D50M hardware FRDM K20D50M Design Package Zip file containing all design source files for the FRDM K20D50M hardware OpenSDA User s Guide Overview and instructions for use of the OpenSDA embedded 3 Getting started Refer to the FRDM K20D50M Quick Start Package for step by step instructions for getting started with the FRDM K20D50M See the Jump Start Your Design section onwww freescale com FRDM K20D50M for the Quick Start Package and software lab guides 4 FRDM K20D50M Hardwar Overview e Arduino R3 compatibility e MK20DX128VLH5 MCU 50 MHz 128KB Flash 16 KB RAM 32 KB FlexNVM Low power 64LQFP package e Dual role USB interface with mini B USB connector e Open SDA Freescale Semiconductor Inc FRDM K20D50MUM Page 4 of 18 e eo oe 7 freescale semiconductor e Capacitive touch slider e Ambient light sensor e MMA8451Q accelerometer e Tri color RGB LED e Flexible power supply options USB coin cell battery external source e Battery ready power measurement access poin
15. ts e Easy access to MCU I O via Arduino R3 compatible I O connectors e Programmable OpenSDA debug interface with multiple applications available including o Massstorage device flash programming interface o P amp E Debug interface provides run control debugging and compatibility with IDE tools o CMSIS DAP interface new ARM standard for embedded debug interface o Datalogging application Freescale Semiconductor Inc FRDM K20D50MUM Page 5 of 18 b IM 7 freescale semiconductor Figure 1 shows a block diagram of the FRDM K20D50M design The primary components and their placement on the hardware assembly are pointed out in Figure 2 Pl i T 3 3V LDO i LIGHT SENSOR 8 MHz TMP 8 MHz BJ um VO I2C GPIO z OpenSDA Inertial Sensor Freescale Semiconductor Inc FRDM K20D50MUM Page 6 of 18 2 freescale semiconductor Capacitive Touch Slider ERE REES GAbE c O 12 L M EO O 0e LO LZ L2 LJ E s 5 L2 L2 LJ L2 L2 iL T amp Accelerometer J2 1 O Header MMA8451Q TPejo09e e RDM K20D50Mc K20D50M USB Freescale Semiconductor Inc FRDM K20D50MUM Page 7 of 18 e e a 7 freescale semiconductor 5 FRDM K20D50M Hardware Description 5 1 1 Power Supply There are multiple power supply options on the FRDM K20D50M It can be powered from either of the USB connectors the Vin pin on the I O header an
16. vides back drive protection P5V SDA Power supplied from the OpenSDA USB connector A Schottky diode provides back drive protection P5V K20D50M Power supplied from the K20D50M USB connector A Schottky diode provides back drive protection P3V3 VREG Regulated 3 3V supply Sources power to the P3V3 supply rail through a back drive protection Schottky diode 1 P3V3 BATT Coin cell battery supply voltage Sources power to the P3V3 supply rail through a back drive protection Schottky diode P3V3 Main supply rail for FRDM K20D50M assembly May be sourced from P3V3 VREG P3V3 BATT or directly from the I O headers J9 pin 8 P3V3 K20D50M K20D50M MCU supply Header J4 provides a convenient means for energy consumption measurements 2 P3V3 SDA OpenSDA circuit supply Header J3 provides a convenient means for energy consumption measurements 2 P5V USB Nominal 5V supplied to the I O headers J9 pin 10 Sourced from either the P5V K20D50M or P5V 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 K20 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 shorted togethe
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