Freescale Semiconductor TWR-KL25Z User manual

Freescale
TWR-KL25Z Tower Module
User Manual
TWR-KL25Z-UM
Rev. 1.0

TWRKL25ZUM TWR-KL25Z Page 2 of 17
Table of Contents
1TWR-KL25Z ...............................................................................................................................................3
2Contents ......................................................................................................................................................4
3TWR-KL25Z Features.............................................................................................................................4
4Get to Know the TWR-KL25Z...............................................................................................................5
5Reference Documents ............................................................................................................................6
6Hardware description............................................................................................................................6
6.1 Block Diagram......................................................................................................................................................................6
6.2 Microcontroller....................................................................................................................................................................7
6.3 Clocking...................................................................................................................................................................................8
6.4 System Power.......................................................................................................................................................................9
6.5 Real Time Clock (RTC)......................................................................................................................................................9
6.6 Debug Interface ...................................................................................................................................................................9
6.6.1 OpenSDA ................................................................................................................................................................................................9
6.6.2 Cortex Debug SWD Connector......................................................................................................................................................9
6.7 Infrared Port......................................................................................................................................................................10
6.8 Accelerometer...................................................................................................................................................................10
6.9 General Purpose Tower Plug-in (TWRPI) Socket...............................................................................................10
6.10 Potentiometer, Pushbuttons, LEDs........................................................................................................................11
6.11 Touch Interface ..............................................................................................................................................................11
6.12 USB......................................................................................................................................................................................12
7TWR-KL25Z Jumper options............................................................................................................. 13
8Useful links ............................................................................................................................................. 15

TWRKL25ZUM TWR-KL25Z Page 3 of 17
1TWR-KL25Z
The TWR-KL25Z microcontroller module is designed to work either in standalone mode or as part of the
Freescale Tower System, a modular development platform that enables rapid prototyping and tool re-use
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. For TWR-KL25Z specific information and updates visit
www.freescale.com/TWR-KL25Z
Figure 1 Freescale Tower System Overview

TWRKL25ZUM TWR-KL25Z Page 4 of 17
2Contents
The TWR-KL25Z contents include:
TWR-KL25Z board assembly
3ft A to mini-B USB cable for debug interface and power
3ft A to micro-B USB cable for MKL25Z128VLK4 USB interface
Micro-B to A adapter for MKL25Z128VLK4 USB Host applications
Quick Start Guide
3TWR-KL25Z Features
Tower compatible microcontroller module
MKL25Z128VLK4 MCU (48 MHz, 128KB Flash, 16 KB RAM, Low power, 80LQFP package
Dual role USB interface with Micro-AB USB connector
Touch Tower Plug-in Socket
General purpose Tower Plug-in (TWRPI) socket
On-board debug circuit MK20 openSDA serial debug interface with virtual serial port and mass storage device
bootloader
Three axis accelerometer (MMA8451Q)
Four (4) user-controllable LEDs
Two (2) capacitive touch pads
Two (2) user pushbutton switches
Infrared transmit and receive
Potentiometer for ADC measurements
GPIO header for prototyping

TWRKL25ZUM TWR-KL25Z Page 5 of 17
4Get to Know the TWR-KL25Z
Figure 2 Top side of TWR-KL25Z module
Figure 3 Bottom side of TWR-KL25Z module

TWRKL25ZUM TWR-KL25Z Page 6 of 17
5Reference Documents
The documents listed below should be referenced for more information on the Kinetis family, Tower System,
and MCU Modules. These can be found in the documentation section of http://www.freescale.com/TWR-KL25Z
or http://www.freescale.com/kinetis
TWRKL25ZQSG: Quick Start Guide
TWR-KL25Z-SCH: Schematics
TWR-KL25Z-PWA: Design Package
MKL25Z128VLK4 Reference Manual
Tower Configuration Tool
Tower Mechanical Drawing
6Hardware description
The TWR-KL25Z is a Tower MCU Module featuring the MKL25Z128VLK4 —a Kinetis microcontroller with USB 2.0
full-speed OTG controllers in a 80 LQFP package. It is intended for use in the Freescale Tower System but can
operate stand-alone. An on-board debug circuit, openSDA, provides a JTAG interface and a power supply input
through a single USB mini-AB connector, as well as a serial to USB, CDC class compliant UART interface.
6.1 Block Diagram
Figure 4Block Diagram of TWR-KL25Z

TWRKL25ZUM TWR-KL25Z Page 7 of 17
6.2 Microcontroller
The TWR-KL25Z features the MKL25Z128VLK4. This 50 MHz microcontroller is part of the Kinetis L series
and is available in an 80 LQFP package. The following table notes the features of MKL25Z128VLK4.
Table 1 Features of MKL25Z128VLK4
Feature
Description
Ultra low power
- 10 low-power modes with power and clock gating for optimal peripheral
activity and recovery times. Stop currents of <190 nA (VLLS0), run currents of
<280 uA/MHz, 4 µs 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
- No user or system intervention to complete programming and erase functions
and full operation down to 1.71V
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
- Analog comparator with 6-bit DAC reference.
- 12-bit independent DAC.
Performance
- 48 MHz ARM Cortex-M0+ core
- 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
- Bit manipulation engine (BME) allows execution of single-instruction atomic
bit-modify-write operations on the peripheral address space

TWRKL25ZUM TWR-KL25Z Page 8 of 17
Timing and Control
- Low power timers.
- Hardware dead-time insertion and quadrature decoding for motor control
- Four-channel 32-bit periodic interrupt timer provides time base for RTOS task
scheduler or trigger source for ADC conversion
Human-Machine
Interface
- Hardware touch-sensing interface (TSI) with up to 16 inputs
- TSI operates in 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
Communications
- Full-Speed USB Device/Host/On-The-Go with device charge detect capability
- 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 (I2S) serial interface for audio system interfacing
- One DSPI module and one I2C module
Reliability, Safety and
Security
- Memory protection unit provides memory protection for all masters on the
cross bar switch, increasing software 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 years after launch
6.3 Clocking
The Kinetis 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
a 32 MHz. An 8 MHz crystal is the default external source for the MCG oscillator inputs (XTAL/EXTAL).
A 32.768 KHz crystal is connected to the RTC oscillator inputs by default.

TWRKL25ZUM TWR-KL25Z Page 9 of 17
6.4 System Power
When installed into a Tower System, the TWR-KL25Z 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 (5.0V ) for the TWR-KL25Z module is derived from either
the openSDA USB mini-B connector or the MKL25Z128VLK4 USB micro-AB connector (J31). Two low-
dropout regulators provide 3.3V and 1.8V supplies from the 5.0V input voltage. Additionally, the 3.3V
regulator built into the MKL25Z128VLK4 can be selected to power the 3.3V bus. All the user selectable
options can be configured using two headers, J3 and J8.
6.5 Real Time Clock (RTC)
Y500 is a 32.768 kHz clock connected to RTC_CLKIN. By enabling the external clock option in the RTC, it can be
used as a highly precise time reference.
6.6 Debug Interface
There are two debug interface options provided: the on-board openSDA circuit and an external ARM SWD
connector.
6.6.1 OpenSDA
An on-board MK20-OpenSDA circuit provides an SWD debug interface to the KL25Z128. A standard USB A
male to mini-B male cable (provided) can be used for debugging via the USB connector, J22. The OpenSDA
interface also provides a USB to serial bridge.
6.6.2 Cortex Debug SWD Connector
The Cortex Debug SWD connector is a standard 2x5-pin (0.05") connector providing an external debugger cable
with access to the SWD interface of the KL25Z128.
Table 2 Cortex Debug connector
Pin
Function
TWR-KL25Z Connection
1
VTref
3.3V MCU supply (V_BRD)
2
SWDIO
PTA3/TSI0_CH4/I2C1_SCL/FTM0_CH0/SWD_DIO
3
GND
GND
4
SWCLK
PTA0/TSI0_CH1/FTM0_CH5/SWD_CLK
5
GND
GND
6
NC
NC
7
NC
NC
8
NC
NC
9
NC
NC
10
RESET
RESET_b

TWRKL25ZUM TWR-KL25Z Page 10 of 17
6.7 Infrared Port
An infrared transmit and receive interface is implemented as shown in Figure 55. The UART2_TX pin directly
drives an infrared diode. The receiver uses an infrared phototransistor connected to UART2_RX through a low-
pass filter. Internal to the K20D50M device, the output of the analog comparator can be routed to a UART
module for easier processing of the incoming IrDA data stream.
Figure 5Infrared circuit
6.8 Accelerometer
An MMA8451Q digital accelerometer is connected to the KL25Z128 MCU through I2C module, I2C1, and
GPIO/IRQ signals, PTC5 and PTC6.The MMA8451Q is a smart low-power, three-axis capacitive micromachined
accelerometer with 14 bits of resolution. The device can be configured to generate inertial wake-up interrupt
signals from any combination of the configurable embedded functions allowing the MMA8451Q to monitor
events and remain in a low-power mode during periods of inactivity. For more information on the
MMA8451Q, please visit the MMA8451Q Product Summary Page.
6.9 General Purpose Tower Plug-in (TWRPI) Socket
The TWR-KL25Z features a socket (J4 and J5) that can accept a variety of different Tower Plug-in modules
featuring sensors, RF transceivers, and more. 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 Table 1Table 3

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Table 3 General Purpose TWRPI socket pinout
J4
J5
Pin
Description
Pin
Description
1
5V VCC
1
GND
2
3.3 V VCC
2
GND
3
GND
3
I2C: SCL
4
3.3V 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
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
UART0_RX / GPIO: GPIO2
18
ADC: TWRPI ID 1
18
GPIO: GPIO3
19
GND
19
GPIO: GPIO4/Timer
20
Reset
20
UART0_TX / GPIO: GPIO5
6.10 Potentiometer, Pushbuttons, LEDs
The TWR-KL25Z features two pushbutton switches connected to GPIO/interrupt signals, one pushbutton
connected to the master reset signal, two capacitive touch pad electrodes, four user-controllable LEDs, and a
potentiometer connected to an ADC input signal. Refer to Table 5 “I/O Connectors and Pin Usage Table” for
information about which pins are connected to these features.
6.11 Touch Interface
The touch sensing input (TSI) module of the KL25Z128 MCU provides capacitive touch sensing detection with
high sensitivity and enhanced robustness. Each TSI pin implements the capacitive measurement of an electrode.
The TWR-KL25Z provides two methods for evaluating the TSI module. There are two electrodes on-board.
Additionally, 12 TSI signals are connected to a Touch Tower Plug-in (TWRPI) socket (J2) that can accept Touch
TWRPI daughter cards that may feature keypads, rotary dials, sliders, etc.

TWRKL25ZUM TWR-KL25Z Page 12 of 17
Table 4 Touch TWRPI socket pinout
Pin
Description
1
P5V_TRG_USB
2
V_BRD
3
TSI0_CH9
4
3.3V VDDA
5
TSI0_CH10
6
VSS (Analog GND)
7
TSI0_CH11
8
TSI0_CH12
9
TSI0_CH13
10
TSI0_CH0
11
TSI0_CH6
12
TSI0_CH7
13
TSI0_CH8
14
TSI0_CH1
15
TSI0_CH4
16
TSI0_CH3
17
ADC: TWRPI ID 0
18
ADC: TWRPI ID 1
19
GND
20
Reset
6.12 USB
The KL25Z128 features a full-speed/low-speed USB module with OTG/Host/Device capability and built-in
transceiver. The TWR-KL25Z routes the USB D+ and D- signals from the KL25Z128 MCU directly to the on-board
USB connector (J13)
A power supply switch with an enable input signal and over-current flag output signal is used to supply power to
the USB connector when the KL25Z128 is operating in host mode.

TWRKL25ZUM TWR-KL25Z Page 13 of 17
7TWR-KL25Z Jumper options
The following is a list of all the jumper options. The default installed jumper settings are shown in bold.
Note: Default Configuration, Board powered by OpenSDA USB, RTC powered by V_BRD
Jumper
Jumper
designator
Signal
Jumper Option
V_BRD
J7
V_BRD
DEF: 1-2 VBRD to MCU_PWR
J9
VDDA_HDR
DEF: 1-2 VDDA to MCU_PWR
VREG IN
SELECTOR
J8
VREG IN SELECTOR
DEF: 1-2 Regulator powered by
OpenSDA USB
2-3 Regulator powered by tower
elevator power
BOARD
POWER
SELECTION
J3
BOARD POWER SELECTION
DEF: 1-3 P3.3V_REG powers
V_BRD(MCU_PWR)
3-5 1.8V powers
VBRD(MCU & Interface circuit input
power)
;

TWRKL25ZUM TWR-KL25Z Page 14 of 17
Table 5 Connectors and Pin Usage
Module
Board
Designator
Name
Options
Signal
USB
J6
KL25 VOUT33
DEF: OPEN
MCU_PWR
J18
KL25 USB VREGIN
DEF: OPEN
P5V_VREGIN_K25
J20
KL25 USB ENA
DEF: OPEN
PTB11/SPI1_SCK
J21
KL25 USB FLGA
DEF: OPEN
PTE31/FTM0_CH4
IRDA
SW1 6-3
IRDAJ
OPEN
PTE22/ADC0_DP3/ADC0_SE
3/UART2_TX
SW1 5-4
CMP0_IN0
OPEN
PTE23/ADC0_DM3/ADC0_S
E7A/UART2_RX
Potentiometer
J1
POT 5K
DEF: 1-2
PTE29/ADC0_SE4B
Accelerometer
J24
SDA Accelerometer
Enable
DEF: 1-2
PTC11/I2C1_SDA
J23
SCL Accelerometer Enable
DEF: 1-2
PTC10/I2C1_SCL
J14
ACCELEROMETER INT1
DEF: OPEN
PTC5/LLWU_P9/SPI0_SCK/C
MP0_OUT
J15
ACCELEROMETER INT2
DEF: OPEN
PTC6/LLWU_P10/EXTRG_IN
/SPI0_MISO
GPIO Header
J11-1
PTE20/ADC0_DP0/ADC0_
SE0
J11-2
PTE21/ADC0_DM0/ADC0_
SE4A
J11-3
PTA1/TSI0_CH2/UART0_R
X
J11-4
GND
J11-5
SWD_DIO_TGTMCU
J11-6
PTE31/FTM0_CH4
J11-7
PTB9
J11-8
PTA2/TSI0_CH3/UART0_T
X
J11-9
PTB11/SPI1_SCK
J11-11
PTB10/SPI1_PCS0
J11-12
GND
J11-13
PTC4/LLWU_P8/UART1_T
X/FTM0_CH3
J11-14
PTC3/LLWU_P7/UART1_R
X/FTM0_CH2/CLKOUT
J11-15
PTC12/FTM_CLKIN0

TWRKL25ZUM TWR-KL25Z Page 15 of 17
Module
Board
Designator
Name
Options
Signal
J11-16
PTC6/LLWU_P10/EXTRG_I
N/SPI0_MISO
J11-17
PTC16
J11-18
PTC13/FTM_CLKIN1
J11-19
GND
J11-20
PTC17
LEDs
J19
LED orange Enable
DEF: 1-2
PTA5/FTM0_CH2
J22
LED Yellow Enable
DEF: 1-2
PTA16
SW1 8-1
LED Green Enable
OPEN
PTA17
SW1 7-2
LED Red Enable
OPEN
PTB8/EXTRG_IN
Push Buttons
SW3
SW3
PTA4
PTA4
SW4
SW4
PTC3
PTC3/LLWU_P7/UART1_RX/
FTM0_CH2/CLKOUT
TSI Electrodes
Elec1
Electrode1
TSI0_CH9
PTB16/TSI0_CH9/UART0_R
X
Elec2
Electrode2
TSI0_CH10
PTB17/TSI0_CH10
UART
J24
KL25 UART RX (OpenSDA
or Elevator)
DEF: 2-3
UART1_RX_TGTMCU
J26
KL25 UART TX (OpenSDA
or Elevator)
DEF: 2-3
UART1_TX_TGTMCU
8Useful links
►http://www.freescale.com/TWR-KL25Z
►www.freescale.com
►www.iar.com/freescale
►www.pemicro.com
►www.freescale.com/codewarrior
•CodeWarrior MCUv10.3 and above
►www.segger.com
•http://www.segger.com/jlink-flash-download.htm

TWRKL25ZUM TWR-KL25Z Page 16 of 17
Revision History
Revision
Date
Description
1.0
July, 2012
First draft
1.0.1
September,2012
First version. Updated to board rev C.

TWRKL25ZUM TWR-KL25Z Page 17 of 17
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TWR-KL25Z-UM
Rev. 1.0
09/2012