NXP Semiconductors TWR-KV31F120M User manual

Freescale Semiconductor, Inc.

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.

Document Number: TWRKV31F120MUG

Rev. 0, 03/2014

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

7. TWR-KV31F120M jumper options and headers 9

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

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

TWR-KV31F120M Tower Module

User’s Guide

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

2Freescale 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

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

Freescale Semiconductor Inc. 3

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

(TWRPI devices not shown)

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

4Freescale Semiconductor Inc.

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

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

Freescale Semiconductor Inc. 5

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

Ultra low-power

• 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

• 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

Flash and SRAM

• 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

• 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

Performance

• 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

Timing and control

• 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

Connectivity and

communications

• 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 I2C modules

Reliability, safety, and

security

• 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

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

6Freescale Semiconductor Inc.

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.

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

Freescale Semiconductor Inc. 7

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

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).

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

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

8Freescale Semiconductor Inc.

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 Table 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

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

Freescale Semiconductor Inc. 9

TWR-KV31F120M jumper options and headers

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

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

Option Jumper Setting Description

Clock Input Source Selection J25

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

2-3 Connect EXTAL to CLKIN0 signal on Primary

Elevator (B24)

Debug Target Power J20

ON Connect P5V_SDA to target power

OFF Disconnect P5V_SDA from target power

Tower Voltage Regulator

Input Selector J1

1-2 [Default] Connect P5V_TRG_SDA (5V from OpenSDA) or

P5_Elev to VREG_IN

2-3 [EXT]Connect USB0_VBUS from Primary Elevator (A57) to

VREG_IN

Board Power Selector J5

1-3 Connect on-board 3.3V regulator output (P3V3_REG) to

main board power line (V_BRD)

3-5 Connect on-board 1.8V regulator output (P1V8) to main

board power line (V_BRD)

MCU VDD current measurement J13

ON Connect V_BRD to MCU_PWR

OFF Allow current measurement on MCU VDD

J6 J5

Pin Description Pin Description

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

10 Freescale Semiconductor Inc.

TWR-KV31F120M jumper options and headers

VDDA and VREFH Power J14

ON Connect V_BRD to VDDA and VREFH

OFF Disconnect V_BRD from VDDA and VREF

LED Connections J17

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

TWRPI Current Measurement J15

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

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

Accelerometer/Magnetometer*

I2C SCL Connection J9

ON Connect PTD2 to I2C_SCL_SNSR

OFF Disconnect PTD2 from I2C_SCL_SNSR

Accelerometer/Magnetometer

I2C SDA Connection J12

ON Connect PTD3 to I2C_SDA_SNSR

OFF Disconnect PTD3 from I2C_SDA_SNSR

Accelerometer/Magnetometer

I2C Slave Address J4

ON Pull accelerometer/magnetometer SA0 low

OFF Pull accelerometer/magnetometer SA0 high

Magnetometer I2C Slave Address J8

ON Pull magnetometer SA1 high

OFF Pull magnetometer SA1 low (also used for accelerometer

GND)

Accelerometer/Magnetometer I2C

Interrupt 1 J11

ON Connect PTD0 to INT1

OFF Disconnect PTD0 from INT1

Accelerometer/Magnetometer I2C

Interrupt 2 J10

ON Connect PTE24 to INT2

OFF Disconnect PTE24 from INT2

Potentiometer Enable J3

ON Connect DAC0_OUT/ADC0_SE23 to POT_5K

OFF Disconnect DAC0_OUT/ADC0_SE23 from POT_5K

Reset Pushbutton J26

1-2 Connect SW5 to SDA_RST_TGTMCU_J_B

2-3 Connect SW5 to RST_TGTMCU_B (Needed when

OpenSDA is not powered)

UART RX Selection J22

1-2 Connect UART0_RX_TGTMCU to UART1_RX_ELEV_BUF

(Tower Elevator)

2-3 Connect UART0_RX_TGTMCU to

UART1_RX_TGTMCU_BUF (OpenSDA)

UART TX Selection J23

1-2 Connect UART0_TX_TGTMCU to UART1_TX_ELEV_BUF

(Tower Elevator)

2-3 Connect UART0_TX_TGTMCU to

UART1_TX_TGTMCU_BUF (OpenSDA)

Option Jumper Setting Description

Table of contents

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