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

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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

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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

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

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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

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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

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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.

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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

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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