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Freedom FRDM-KV31F Development

Platform User’s Guide

1. Introduction

The 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 Freedom KV31 hardware, FRDM-

KV31F, is a simple, yet sophisticated design featuring a

Kinetis V series microcontroller, built on the ARM

Cortex

-M4 core, is a high-performance solution for

BLDC, PMSM and ACIM motor control applications.

FRDM-KV31F can be used to evaluate the KV3x

Kinetis V series devices. The KV3x device family

features the MKV31F512VLL12 microcontroller, which

is part of the KV3x device family. This family runs at

100/120 MHz with DSP and floating point unit, and it

features dual 16-bit analog-to-digital converters (ADCs)

sampling at up to 1.2 mega samples per second (MSPS),

multiple motor control timers, 64 KB to 512 KB of flash

memory, and a comprehensive enablement suite from

NXP and its third-party resources including reference

designs, software libraries, and motor configuration

tools. The FRDM-KV31F hardware is form-factor

compatible with the Arduino

R3 pin layout, providing

a broad range of expansion board options. The onboard

interface includes a six-axis digital accelerometer &

magnetometer, and a RGB LED. The FRDM-KV31F

platform features OpenSDA, and an open-source

hardware embedded serial and debug adapter running an

open-source bootloader. This circuit offers several

options for serial communication, flash programming,

and run-control debugging. OpenSDA is an mbed HDK-

Freescale Semiconductor, Inc.

Document Number: FRDMKV31FUG

User's Guide

02/2016

Contents

1. Introduction ........................................................................ 1

2. FRDM-KV31F Hardware Overview .................................. 2

3. FRDM-KV31F Hardware Description ............................... 3

3.1. Power supply .......................................................... 3

3.2. Serial and debug adapter (OpenSDAv2.1) .............. 4

4. Microcontroller .................................................................. 6

5. Clock source ...................................................................... 7

6. Accelerometer and magnetometer ...................................... 8

7. Thermistor .......................................................................... 9

8. RGB LED ........................................................................ 10

9. Serial Port ........................................................................ 11

10. Reset ................................................................................ 11

11. Push Button Switches ...................................................... 12

12. Input/output connectors .................................................... 12

13. Arduino Compatibility ..................................................... 13

14. References ........................................................................ 13

15. Revision History .............................................................. 14

Summary of content (15 pages)

PAGE 1
Freescale Semiconductor, Inc. User's Guide Document Number: FRDMKV31FUG 0, 02/2016 Freedom FRDM-KV31F Development Platform User’s Guide 1. Introduction The 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.
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FRDM-KV31F Hardware Overview compatible debug interface preloaded with the open-source CMSIS-DAP Interface firmware (mbed interface) for rapid prototyping and product development. 2. FRDM-KV31F Hardware Overview The features of the FRDM-KV31F hardware are as follows:  MKV31F512VLL12 MCU (120 MHz with DSP instructions, 512 KB flash memory and 96 KB RAM, motor control timers, and 100 LQFP)  On-board debug circuit: K20DX128VFM5 (OpenSDA) with virtual serial port.
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FRDM-KV31F Hardware Description The primary components and their placement on the hardware assembly are explained in the below figure. Figure 1. FRDM-KV31F main components placement 3. FRDM-KV31F Hardware Description 3.1. Power supply There are multiple power supply options on the FRDM-KV31F. It can be powered from either of the USB connectors, the VIN pin on the I/O header, DC Jack (not populated), or an off-board 1.71 V –3.6 V supply from the 3.3 V pin on the I/O header.
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FRDM-KV31F Hardware Description Table 1. FRDM-KV31F Power supply requirements Supply source Valid range OpenSDAv2 operational? Regulated onboard? OpenSDAv2 USB VIN Pin 3.3 V Header (J20) DC Jack (not populated) 5V 5–9V 1.71 V – 3.6 V 5–9V Yes No No No Yes Yes No Yes Figure 2. Power supply schematic 3.2. Serial and debug adapter (OpenSDAv2.1) An on-board K20DX128VFM5-based OpenSDA circuit provides a SWD debug interface to the KV31F512VLL12.
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FRDM-KV31F Hardware Description Figure 3. OpenSDA high-level block diagram 3.2.1. Debug interface Signals with SPI and GPIO capability are used to connect directly to the SWD of the KV31. These signals are also brought out to a standard 10-pin (0.05”) Cortex debug connector (J9). It is possible to isolate the KV31 MCU from the OpenSDA circuit and use J9 to connect to an off-board MCU. To accomplish this, cut the trace on the bottom side of the PCB that connects J11 pin 2 to the J9 pin 4.
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Microcontroller 3.2.2. Virtual serial port A serial port connection is available between the OpenSDA MCU and pins PTA1 and PTA2 of the KV31 MCU. 4. Microcontroller The FRDM-KV31F features the MKV31F512VLL12 MCU. The KV31 MCU family is a highly scalable member of the Kinetis V series and provides a high-performance, cost-competitive motor control solution. Built on the ARM Cortex-M4 core running at 120 MHz, combined with floating point and DSP capability, this is implemented in the 100-pin LQFP package.
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Clock source Timers Communication interfaces  Two analog comparators (CMP) with a 6-bit DAC.  Accurate internal voltage reference/  Two 8-ch motor-control/general purpose/PWM timers.  Two 2-ch motor-control/general purpose timers with quadrature decoder functionality.  Periodic interrupt timers.  16-bit low-power timer.  Programmable delay block.  Two SPI modules.  Three UART modules and one low-power UART.  Two I2C: Support for up to 1 Mbit/s operation 5.
PAGE 8
Accelerometer and magnetometer 6. Accelerometer and magnetometer An FXOS8700CQ low-power, 6-axis Xtrinsic sensor is interfaced through an I2C bus and two GPIO signals, as shown in the following table. By default, the I2C address is 0x1D (SA0 pull-up and SA1 pulldown). Table 3.
PAGE 9
Thermistor Figure 6. Accelerometer and magnetometer 7. Thermistor There is a thermistors RT1 provided on the platform that can be used as single-ended or differential analog inputs to the KV31 MCU. In addition to the thermistor, there is a resistor between the thermistor and 3.3 V system power supply and another resistor between the thermistor and ground. The thermistor is a 10 K ohm part, but the Freedom FRDM-KV31F Development Platform User’s Guide, User's Guide, 0, 02/2016 Freescale Semiconductor, Inc.
PAGE 10
RGB LED associated divider chain uses different resistors. This makes the voltage across the thermistor larger or smaller, and provides the ability to try the different gain settings on the analog channels. The thermistor circuit is designed to provide useable differential inputs over the temperature range of 90˚ C to -20˚ C. In addition to the thermistor voltage divider chain, the thermistor has a 0.1 uF capacitor in parallel.
PAGE 11
Reset Figure 8. RGB LED 9. Serial Port The primary serial port interface signals are PTB16 UART0_RX and PTB17 UART0_TX. These signals are connected to the OpenSDA circuit. 10. Reset The reset signal on the K20 is connected externally to a push button, SW1, and also to the OpenSDAv2 circuit. The reset button can be used to force an external reset event on the target MCU. The reset button can also be used to force the OpenSDA circuit into bootloader mode. For more details, see Section 3.
PAGE 12
Input/output connectors 11. Push Button Switches Two push buttons, SW2 and SW3, are available on the FRDM-KV31F board, where SW2 is connected to PTC6, and SW3 is connected to PTA4. Besides the general purpose input/output functions, SW2 and SW3 can be a low-power wake up signal. Also, only SW3 can be a non-maskable interrupt. Table 5. Push button GPIO function Switch GPIO Function SW2 PTA4/LLWU_P3/FTM0_CH1/FTM0_FLT3/NMI/EZP_CS SW3 PTE4/LLWU_P2/SPI1_PCS0/LPUART0_TX Figure 10.
PAGE 13
References Figure 11. FRDM-KV31F I/O header pinout 13. Arduino Compatibility The I/O headers on the FRDM-KV31F platform are arranged to enable compatibility with peripheral boards (known as shields) that connect to Arduino and Arduino-compatible microcontroller boards. The outer rows of pins (even numbered pins) on the headers, share the same mechanical spacing and placement with the I/O headers on the Arduino Revision 3 (R3) standard. 14. References The following references are available on www.nxp.
PAGE 14
Revision History 15. Revision History Table 6. Revision history Revision number Date Substantive changes 0 02/2016 Initial release Freedom FRDM-KV31F Development Platform User’s Guide, User's Guide, 0, 02/2016 14 Freescale Semiconductor, Inc.
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How to Reach Us: Home Page: freescale.com Web Support: freescale.com/support Information in this document is provided solely to enable system and software implementers to use Freescale products. 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.