NXP Semiconductors TWR-KV31F120M User manual

Freescale Semiconductor, Inc.
User’s Guide
© 2014 Freescale Semiconductor, Inc.
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
8
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
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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
(TWRPI devices not shown)

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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
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

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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
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

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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 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

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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

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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