NXP Semiconductors TWR-KV31F120M User Manual

Freescale Semiconductor, Inc.

User’s Guide

Document Number: TWRKV31F120MUG

Rev. 0, 03/2014

TWR-KV31F120M Tower Module
User’s Guide

1 TWR-KV31F120M

The TWR-KV31F120M microcontroller module is
designed to work in standalone mode or as part of
the Freescale Tower system, a modular development
platform that enables rapid prototyping and tool
reuse through reconfigurable hardware. Take your
design to the next level and begin constructing your
Tower system today by visiting
www.freescale.com/tower for additional Tower
System microcontroller modules and compatible
peripherals.

Contents

1. TWR-KV31F120M . . . . . . . . . . . . . . . . . 1

2. Contents . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3. TWR-KV31F120M features . . . . . . . . . . . 3

4. Get to know the TWR-KV31F120M . . . . 3

5. Reference documents . . . . . . . . . . . . . . . . 4

6. Hardware description . . . . . . . . . . . . . . . . 4

6.1.Microcontroller . . . . . . . . . . . . . . . . . . 5

6.2.Clocking . . . . . . . . . . . . . . . . . . . . . . . 6

6.3.System power . . . . . . . . . . . . . . . . . . . 6

6.4.Debug interface . . . . . . . . . . . . . . . . . 6

6.5.Accelerometer plus Magnetometer . . 7

6.6.Potentiometer, pushbuttons, and LEDs 8

6.7.General Purpose Tower Plug-in (TWRPI) socket
8

7. TWR-KV31F120M jumper options and headers 9

8. Useful links . . . . . . . . . . . . . . . . . . . . . . . 11

9. Revision history . . . . . . . . . . . . . . . . . . . 12

© 2014 Freescale Semiconductor, Inc.

Contents

Figure 1. Freescale tower system overview

2Contents

The TWR-KV31F120M contents include:

• TWR-KV31F120M board assembly

• A to micro-B USB cable for debug interface and power

• Quick start guide

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TWR-KV31F120M features

3 TWR-KV31F120M features

• Tower-compatible microcontroller module.

• KV31F512VLL12 MCU (120 MHz, 512 KB Flash, 96 KB RAM, low power, 100 LQFP package).

• General-purpose Tower Plug-in (TWRPI) socket.

• On-board debug circuit: K20DX128VFM5 (OpenSDA) with virtual serial port.

• FXOS8700CQ: 6-Axis Digital Sensor Accelerometer + Magnetometer.

• Four (4) user-controllable LEDs plus RGB LED.

• Four (4) user pushbutton switches for GPIO interrupts.

• One (1) user pushbutton switch for MCU reset.

• Potentiometer.

4 Get to know the TWR-KV31F120M

Figure 2. Front side of TWR-KV31F120M module

TWR-KV31F120M Tower Module, User’s Guide, Rev. 0, 03/2014

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(TWRPI devices not shown)

Reference documents

5 Reference documents

The documents listed below should be referenced for more information on the Kinetis K Series, Tower
System, and MCU modules. These can be found in the documentation section of
www.freescale.com/kinetis.

• TWR-KV31F120M-SCH (schematics)

• KV31P100M120SF7RM (reference manual)

• Tower configuration tool

• Tower mechanical drawing

6 Hardware description

The TWR-KV31F120M is a Tower MCU Module featuring the KV31F512VLL12—a Kinetis V Series
microcontroller in a 100 LQFP package with high speed run mode. It is intended for use in the Freescale
Tower System but can also operate alone. An on-board OpenSDA debug circuit provides a Serial Wire
Debug (SWD) interface and a power supply input through a single micro-USB connector.

The block diagram of the TWR-KV31F120M board is presented in the following figure:

Figure 3. Block Diagram of TWR-KV31F120M

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Hardware description

6.1 Microcontroller

The TWR-KV31F120M features the KV31F512VLL12 MCU. This 120 MHz microcontroller is part of
the Kinetis KV3x family and is implemented in a 100 LQFP package. The following table notes some of
the features of the KV31F512VLL12 MCU.

Table 1. Features of KV31F512VLL12

Feature Description

• 11 low-power modes with power and clock gating for optimal peripheral activity and recovery
times.

• Full memory and analog operation down to 1.71 V for extended battery life

Ultra low-power

Flash and SRAM

• Low-leakage wake-up unit with up to three internal modules and 8 pins as wake-up sources
in low-leakage stop (LLS) and very low-leakage stop (VLLS) modes

• Low-power timer for continual system operation in reduced power states

• 512-KB flash featuring fast access times, high reliability, and four levels of security protection

• 96 KB of SRAM

• No user or system intervention to complete programming and erase functions, and full
operation down to 1.71 V

Mixed-signal capability

Performance

Timing and control

Connectivity and

communications

Reliability, safety, and

security

• High-speed 16-bit ADC with configurable resolution

• Single or differential output modes for improved 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

• 120-MHz ARM Cortex-M4F core with DSP and FPU instruction set, single cycle MAC, and
single instruction multiple data (SIMD) extensions

• Up to 16 channel DMA for peripheral and memory servicing with reduced CPU loading and
faster system throughput

• Crossbar switch enables concurrent multi-master bus accesses, increasing bus bandwidth

• Up to four FlexTimers (FTM) with a total of 20 channels

• Hardware dead-time insertion and quadrature decoding for motor control

• Four-channel 32-bit periodic interrupt timer (PIT) provides time base for RTOS task
scheduler, or trigger source for ADC conversion and programmable delay block

• Four UARTs:
– one UART that supports RS232 with flow control, RS485, and ISO7816
– two UARTs that support RS232 with flow control and RS485
– one low power UART (LPUART)

• Two DSPI modules and two I

• Cyclic redundancy check (CRC) engine validates memory contents and communication
data, increasing system reliability

• Independently-clocked 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

• Included in Freescale’s product longevity program, with assured supply for a minimum of 10
years after launch

2

C modules

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Hardware description

6.2 Clocking

Kinetis V Series MCUs start up from an internal digitally controlled oscillator (DCO). Software can enable
the main external oscillator (EXTAL0/XTAL0) if desired. The external oscillator/resonator can range from

32.768 KHz up to 32 MHz. An 8-MHz crystal is the default external source for the MCG oscillator inputs
(XTAL/EXTAL).

By connecting J25 (2-3) jumper enables other external clock sources for the KV31F512VLL12 include the
CLKIN0 signal, which can be provided through the TWR-ELEV module or pin 20 of TWRPI connector
J6.

6.3 System power

When installed into a Tower System, the TWR-KV31F120M can be powered from either an on-board
source or from another source in the assembled Tower System.

In stand-alone operation, the main power source (5.0 V) for the TWR-KV31F120M module is derived
from the OpenSDA USB micro-B connector (J21). Two low-dropout regulators provide 3.3 V and 1.8 V
supplies from the 5.0 V input voltage. All of the user-selectable options can be configured using two
headers, J1 and J5. Refer to sheet 4 of the TWR-KV31F120M schematics for more details.

6.4 Debug interface

There are two debug interface options provided: the on-board OpenSDA circuit and an external ARM
Cortex JTAG connector. The ARM Cortex JTAG connector (J19) is a standard 2x10-pin connector that
provides an external debugger cable access to the JTAG interface of the KV31F512VLL12. Alternatively,
the on-board OpenSDA debug interface can be used to access the debug interface of the
KV31F512VLL12.

6.4.1 OpenSDA

An on-board K20DX128VFM5-based OpenSDA circuit provides a SWD debug interface to the
KV31F512VLL12. A standard USB A male to micro-B male cable (provided) can be used for debugging
via the USB connector (J21).

The OpenSDA interface also provides a USB to serial bridge. Drivers for the OpenSDA interface are
provided in the P&E Micro OpenSDA Tower Toolkit. These drivers and more utilities can be found online
at http://www.pemicro.com/opensda.

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Hardware description

6.4.2 Cortex debug connector

The Cortex Debug connector is a 20-pin (0.05") connector providing access to the SWD, JTAG, cJTAG,
and EzPort signals available on the KV31 device. The pinout and KV31 pin connections to the debug
connector (J19) are shown in Table 2.

Table 2. Cortex debug connector

Pin Function TWR-KV31F120M connection

1 VTref 3.3 V MCU supply (MCU_PWR)

2 TMS / SWDIO PTA3/UART0_RTS_b/FTM0_CH0/JTAG_TMS/SWD_DIO

3 GND GND

4 TCK / SWCLK PTA0/UART0_CTS_b/FTM0_CH5/JTAG_CLK/SWD_CLK/EZP_CLK

5 GND GND

6 TDO/SWO PTA2/UART0_TX/FTM0_CH7/JTAG_TDO/TRACE_SWO/EZP_DO

7Key –

8 TDI PTA1/UART0_RX/FTM0_CH6/JTAG_TDI/EZP_DI

9 GNDDetect PTA4/FTM0_CH1/MS/NMI_b/EZP_CS_b

10 nRESET RESET_b

11 Target Power 5 V supply (via jumper J20)

12 – NC

13 Target Power 5 V supply (via jumper J20)

14 – NC

15 GND GND

16 – NC

17 GND GND

18 – NC

19 GND GND

20 – NC

6.5 Accelerometer plus Magnetometer

An FXOS8700CQ 6-Axis Digital Sensor Accelerometer + Magnetometer is connected to the
KV31F512VLL12 MCU through an I2C interface (I2C0) and GPIO/IRQ signals (PTD0 and PTE24).

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Hardware description

6.6 Potentiometer, pushbuttons, and LEDs

The TWR-KV31F120M also features:

• A potentiometer connected to an ADC input signal (ADC0_SE23).

• Four pushbutton switches

• SW1-PTC6/LLWU_P10, SW2-PTC11/LLWU_P11, SW3-PTA4/LLWU_P3, SW4-PTE25.

• Four user-controllable LEDs connected to GPIO signals (optionally isolated using jumpers):

— Yellow LED (D3) to PTE1

— Red LED (D4) to PTE0

— Orange LED (D6) to PTB19

— Green LED (D7) to PTD7

• RGB LED

6.7 General Purpose Tower Plug-in (TWRPI) socket

The TWR-KV31F120M features a socket (J6 and J7) that can accept a variety of different Tower Plug-in
modules featuring sensors, RF transceivers, and other peripherals. The General Purpose TWRPI socket
provides access to I2C, SPI, IRQs, GPIOs, timers, analog conversion signals, TWRPI ID signals, reset,
and voltage supplies. The pinout for the TWRPI Socket is defined in Tab l e 3.

Table 3. General purpose TWRPI socket pinout

J6 J5

Pin Description Pin Description

1 5 V VCC 1 GND

2 3.3 V VCC 2 GND

3GND 3 I2C: SCL

4 3.3 V VDDA 4 I2C: SDA

5 VSS (Analog GND) 5 GND

6 VSS (Analog GND) 6 GND

7 VSS (Analog GND) 7 GND

8 ADC: Analog 0 8 GND

9 ADC: Analog 1 9 SPI:MISO

10 VSS (Analog GND) 10 SPI:MOSI

11 VSS (Analog GND) 11 SPI:SS

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TWR-KV31F120M jumper options and headers

J6 J5

Pin Description Pin Description

12 ADC: Analog 2 12 SPI:CLK

13 VSS (Analog GND) 13 GND

14 VSS (Analog GND) 14 GND

15 GND 15 GPIO:GPIO0/IRQ

16 GND 16 GPIO:GPIO1/IRQ

17 ADC: TWRPI ID 0 17 UART:UART_RX or GPIO: GPIO2

18 ADC: TWRPI ID 1 18 UART:UART_TX or GPIO: GPIO3

19 GND 19 UART:UART_CTS or GPIO:GPIO4/Timer

20 Resist 20 UART:UART_CTS or GPIO:GPIO5/Timer

7 TWR-KV31F120M jumper options and headers

The following is a list of all of the jumper options on the TWR-KV31F120M. The default installed jumper
settings are indicated by white text on a black background

Table 4. TWR-KV31F120M jumper options

Option Jumper Setting Description

Clock Input Source Selection J25

Debug Target Power J20

Tower Voltage Regulator
Input Selector

Board Power Selector J5

MCU VDD current measurement J13

J1

1-2 Connect main EXTAL to on-board 8 MHz crystal

Connect EXTAL to CLKIN0 signal on Primary

2-3

Elevator (B24)

ON Connect P5V_SDA to target power

OFF Disconnect P5V_SDA from target power

[Default] Connect P5V_TRG_SDA (5V from OpenSDA) or

1-2

P5_Elev to VREG_IN

[EXT]Connect USB0_VBUS from Primary Elevator (A57) to

2-3

VREG_IN

Connect on-board 3.3V regulator output (P3V3_REG) to

1-3

main board power line (V_BRD)

Connect on-board 1.8V regulator output (P1V8) to main

3-5

board power line (V_BRD)

ON Connect V_BRD to MCU_PWR

OFF Allow current measurement on MCU VDD

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TWR-KV31F120M jumper options and headers

Option Jumper Setting Description

VDDA and VREFH Power J14

LED Connections J17

TWRPI Current Measurement J15

Accelerometer/Magnetometer*
I2C SCL Connection

Accelerometer/Magnetometer
I2C SDA Connection

Accelerometer/Magnetometer
I2C Slave Address

J9

J12

J4

Magnetometer I2C Slave Address J8

ON Connect V_BRD to VDDA and VREFH

OFF Disconnect V_BRD from VDDA and VREF

1-2 Connect PTE1 to Yellow LED D3

3-4 Connect PTE0 to Red LED D4

5-6 Connect PTB19 to Orange LED D6

7-8 Connect PTD7 Green LED D7

ON Connect V_BRD to TWRPI 3-V power (GPT_VBRD)

OFF Disconnect V_BRD from TWRPI 3-V power (GPT_VBRD)

ON Connect PTD2 to I2C_SCL_SNSR

OFF Disconnect PTD2 from I2C_SCL_SNSR

ON Connect PTD3 to I2C_SDA_SNSR

OFF Disconnect PTD3 from I2C_SDA_SNSR

ON Pull accelerometer/magnetometer SA0 low

OFF Pull accelerometer/magnetometer SA0 high

ON Pull magnetometer SA1 high

OFF

Pull magnetometer SA1 low (also used for accelerometer
GND)

Accelerometer/Magnetometer I2C
Interrupt 1

Accelerometer/Magnetometer I2C
Interrupt 2

J11

J10

Potentiometer Enable J3

Reset Pushbutton J26

UART RX Selection J22

UART TX Selection J23

ON Connect PTD0 to INT1

OFF Disconnect PTD0 from INT1

ON Connect PTE24 to INT2

OFF Disconnect PTE24 from INT2

ON Connect DAC0_OUT/ADC0_SE23 to POT_5K

OFF Disconnect DAC0_OUT/ADC0_SE23 from POT_5K

1-2 Connect SW5 to SDA_RST_TGTMCU_J_B

Connect SW5 to RST_TGTMCU_B (Needed when

2-3

OpenSDA is not powered)

Connect UART0_RX_TGTMCU to UART1_RX_ELEV_BUF

1-2

(Tower Elevator)

Connect UART0_RX_TGTMCU to

2-3

UART1_RX_TGTMCU_BUF (OpenSDA)

Connect UART0_TX_TGTMCU to UART1_TX_ELEV_BUF

1-2

(Tower Elevator)

Connect UART0_TX_TGTMCU to

2-3

UART1_TX_TGTMCU_BUF (OpenSDA)

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*FXOS87000CQ Accelerometer/Magnetometer is standard. MMA8451Q Accelerometer is optional

The following figure shows jumper default position on TWR-KV31F120M.

Useful links

Figure 4. Jumper default position

8 Useful links

• www.freescale.com

– freescale.com/Kinetis

• www.iar.com/freescale

• www.pemicro.com

– http://www.pemicro.com/opensda

• www.segger.com

– http://www.segger.com/jlink-flash-download.html

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Revision history

9 Revision history

Revision number Date Substantial changes

0 03/2014 Initial release

Table 5. Revision history

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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. 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

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Freescale, the Freescale logo, and Kinetis are trademarks of Freescale

Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. Tower is a trademark of Freescale

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respective owners. ARM and Cortex are registered trademarks of ARM Limited (or its

subsidiaries) in the EU and/or elsewhere. All rights reserved.

© 2014 Freescale Semiconductor, Inc.

Document Number: TWRKV31F120MUG
Rev. 0
03/2014