Freescale Semiconductor FRDM-KL25Z User manual

Freescale Semiconductor Inc. FRDMKL25ZUM
FRDM-KL25Z
User Manual
Rev. 0

FRDMKL25ZUM FRDM-KL25Z User Manual Page 2 of 10
Table of Contents
Overview ..................................................................................................................................................... 3
Reference Documents................................................................................................................................. 3
Getting Started............................................................................................................................................ 3
FRDM-KL25Z Hardware Overview .............................................................................................................. 3
FRDM-KL25Z Hardware Description ........................................................................................................... 6
Power Supply .......................................................................................................................................... 6
Serial and Debug Adapter (OpenSDA) .................................................................................................... 8
Bootloader Mode ...............................................................................................................................................................8
Application Mode...............................................................................................................................................................8
Debug Application ..............................................................................................................................................................8
MSD Application.................................................................................................................................................................8
KL25Z Microcontroller ............................................................................................................................ 8
Clock Source .......................................................................................................................................................................8
USB Interface......................................................................................................................................................................8
Reset...................................................................................................................................................................................8
Debug .................................................................................................................................................................................8
Capacitive Touch Slider........................................................................................................................... 8
3-axis Accelerometer .............................................................................................................................. 9
RGB LED................................................................................................................................................... 9
Input/Output Headers ............................................................................................................................ 9
Arduino Compatibility............................................................................................................................. 9
List of Figures
Figure 1. FRDM-KL25Z Block Diagram ........................................................................................................ 4
Figure 2. FRDM-KL25Z Feature Call-outs (Preliminary) ............................................................................. 5
Figure 3. Power Supply Schematic.............................................................................................................. 7
Revision History
Revision
Date
Changes
0

FRDMKL25ZUM FRDM-KL25Z User Manual Page 3 of 10
Overview
The Freescale Freedom development platform is an evaluation and development tool ideal for rapid
prototyping of microcontroller-based applications. The hardware design is form-factor compatible with
popular third-party hardware designed to work with Arduino™ and Arduino-compatible boards.
The Freescale Freedom KL25Z hardware is a simple, yet sophisticated design featuring a Kinetis L Series
microcontroller, the industry’s first microcontroller built on the ARM® Cortex™-M0+ core. The
KL25Z128VLK4 is the featured microcontroller on the FRDM-KL25Z. This KL2 family device boasts an
energy-efficient core and system platform with a max operating frequency of 48MHz, 128KB of flash, a
full-speed USB controller, and loads of analog and digital peripherals. The specifications of the
KL25Z128 and the flexible design of the FRDM-KL25Z enable a wide variety of design prototypes
including those dependent on battery power or harvested energy.
The FRDM-KL25Z is the first hardware platform to feature the Freescale open standard embedded
serial and debug adapter known as OpenSDA. This circuit offers the user several options for serial
communications, flash programming and run-control debugging.
There are also many software development tool options available to the user. Choices include
CodeWarrior for Microcontrollers, IAR Embedded Workbench, Keil MDK featuring the µVision IDE, Red
Suite from Code Red Technologies, Atollic TrueSTUDIO, Rowley Crossworks, and more.
All of these features combine to give the user the freedoms needed to rapidly prototype many
embedded designs: a powerful microcontroller built on a very low-power core and SoC platform, easy-
access to I/O with a large ecosystem of compatible hardware, a flexible programming and debug
interface, and a large ecosystem of software development environments. Freedom!
Reference Documents
FREEDOM-KL25Z Pinouts.xlsx
-Spreadsheet of all microcontroller and I/O header pin
connections.
OpenSDA User’s Guide
- A guide for users of the OpenSDA embedded circuit.
Getting Started
FRDM-KL25Z Hardware Overview
The FRDM-KL25Z hardware is a Freescale Freedom development platform microcontroller board
assembly with the following features:
Kinetis L Series KL2 family MCU in an 80 LQFP package

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I/O headers for easy access to MCU I/O pins
Freescale inertial sensor, MMA8451Q
Capacitive touch slider
Reset pushbutton
RGB LED
On-board serial and debug adapter (OpenSDA)
Figure 1 shows a block diagram of the FRDM-KL25Z design.
Figure 1. FRDM-KL25Z Block Diagram

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Figure 2. FRDM-KL25Z Feature Call-outs (Preliminary)
The FRDM-KL25Z features two microcontrollers (MCUs): the target MCU and a serial and debug
adapter (OpenSDA) MCU. The target MCU is a Kinetis L Series KL2 family device, the KL25Z128VLK4.
The OpenSDA MCU is a Kientis K Series K20 family device, the K20DX128VFM5.
Features of the KL25Z128VLK4 target MCU include:
32-bit ARM Cortex-M0+ core
-up to 48 MHz operation
-Single-cycle fast I/O access port
Memories
-12 KB flash
-16 KB SRAM
System integration
-Power management and mode controllers
-Low-leakage wakeup unit
-Bit manipulation engine for read-modify-write peripheral operations
-Direct memory access (DMA) controller
-Computer operating properly (COP) Watchdog timer
Clocks
-Clock generation module with FLL and PLL for system and CPU clock generation
-4 MHz and 32 kHz internal reference clock
-System oscillator supporting external crystal or resonator

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-Low-power 1kHz RC oscillator for RTC and COP watchdog
Analog peripherals
-16-bit SAR ADC w/ DMA support
-12-bit DAC w/ DMA support
-High speed comparator
Communication peripherals
-Two 8-bit Serial Peripheral Interfaces (SPI)
-USB dual-role controller with built-in FS/LS transceiver
-USB voltage regulator
-Two I2C modules
-One low-power UART and two standard UART modules
Timers
-One 6-channel Timer/PWM module
-Two 2-channel Timer/PWM modules
-2-channel Periodic Interrupt Timer (PIT)
-Real time clock (RTC)
-Low-power Timer (LPT)
-System tick timer
Human-Machine Interfaces (HMI)
-General purpose input/output controller
-Capacitive touch sense input interface hardware module
FRDM-KL25Z Hardware Description
Power Supply
The FRDM-KL25Z offers a design with multiple power supply options. It can be powered from either of
the USB connectors, the VIN pin on the I/O header, an on-board coin cell battery, or an off-board 1.71-
3.6V supply from the 3.3V pin on the I/O header. The USB and VIN supplies are regulated on-board
using a 3.3V linear regulator to produce the main power supply. The other two sources are not
regulated on-board. Table 1 provides the operational details and requirements for the power supplies.
Table 1. Power Supply Requirements
Supply Source
Valid Range
OpenSDA
Operational?
Regulated on-
board?
OpenSDA USB (J7)
5V
Yes
Yes
KL25Z USB (J5)
5V
No
Yes
VIN Pin
4.3-9V
No
Yes
3.3V Pin
1.71-3.6V
No
No
Coin Cell Battery
1.71-3.6V
No
No
Note that the OpenSDA circuit is only operational when a USB cable is connected and supplying power
to J7. However, protection circuitry is in place to allow multiple sources to be powered at once.
Figure 3 shows the schematic drawing for the power supply inputs and the on-board voltage regulator.

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Figure 3. Power Supply Schematic
Table 2. FRDM-KL25Z Power Supplies
Power Supply Name
Description
P5-9V_VIN
Power supplied from the VIN pin of the I/O headers (J9 pin 16).
P5V_SDA
Power supplied from the OpenSDA USB connector (J7). A Schottky
diode provides back drive protection.
P5V_KL25Z
Power supplied from the KL25Z USB connector (J5). A Schottky diode
provides back drive protection.
P3V3_VREG
Regulated 3.3V supply. Sources power to the P3V3 supply rail
through a back drive protection Schottky diode. 1
P3V3_BATT
Coin cell battery supply voltage. Sources power to the P3V3 supply
rail through a back drive protection Schottky diode.
P3V3
Main supply rail for the FRDM-KL25Z assembly. May be sourced from
P3V3_VREG, P3V3_BATT, or directly from the I/O headers (J9 pin 8)
P3V3_KL25Z
KL25Z MCU supply. Header J4 provides a convenient means for
energy consumption measurements. 2
P3V3_SDA
OpenSDA circuit supply. Header J3 provides a convenient means for
energy consumption measurements. 2
P5V_USB
Nominal 5V supplied to the I/O headers (J9 pin 10). Sourced from
either the P5V_KL25Z or P5V_OSDA supply through a back drive
protection Schottky diode.
Notes:
1) By default the linear regulator, U1, is a 3.3V output regulator. However, this
is a common footprint that would allow the user to modify the assembly to
utilize an alternative device such as a 1.8V or 2.5V regulator. The KL25Z
microcontroller has an operating range of 1.71V to 3.6V.
2) J3 and J4 are not populated by default. The two pins of these headers are
shorted together by a trace on the bottom layer of the PCB. To measure the
energy consumption of either the KL25Z or the OpenSDA MCU, the trace
between these pins must first be cut. A current probe or a shunt resistor and
voltage meter can then be applied to measure the energy consumption on these
rails.

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<<To do: Add J9 power supply information. Include details on how power can be sourced and the
IOREF pin >>
Serial and Debug Adapter (OpenSDA)
<<To Do: add details and diagrams here>>
Bootloader Mode
How to enter bootloader mode
Application Mode
Debug Application
MSD Application
KL25Z Microcontroller
Clock Source
The Kinetis KL2 microcontrollers feature an on-chip oscillator compatible with three ranges of input
crystal or resonator frequencies: 32-40 kHz (low freq. mode), 3-8 MHz (high freq. mode, low range) and
8-32 MHz (high freq. mode, high range). The KL25Z128 on the FRDM-KL25Z is clocked from an 8 MHz
crystal.
<<To Do: add note about RTC_CLKIN pin and use cases>>
USB Interface
The Kinetis KL2 microcontrollers feature a dual-role USB controller with on-chip full-speed and low-
speed transceivers. The USB interface on the FRDM-KL25Z is configured as a full-speed USB device. J5
is the USB connector for this interface.
Reset
The PTA20/RESET signal on the KL25Z128 is connected externally to a pushbutton, SW1, and also to the
OpenSDA circuit. The reset button can be used to force an external reset event in the target MCU. The
reset button can also be used to force the OpenSDA circuit into bootloader mode. Please refer to the
Serial and Debug Adapter (OpenSDA) section for more details.
Debug
The sole debug interface on all Kinetis L Series devices is a Serial Wire Debug (SWD) port. The primary
controller of this interface on the FRDM-KL25Z is the onboard OpenSDA circuit. However, an
unpopulated 10-pin (0.05”) Cortex Debug connector, J6, provides access to the SWD signals.
Capacitive Touch Slider
Two Touch Sense Input (TSI) signals, TSI0_CH9 and TSI0_CH10, are connected to capacitive electrodes
configured as a touch slider.
<<To Do: add a diagram highlighting which electrode is CH9 and which is CH10>>

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3-axis Accelerometer
A Freescale MMA8451Q low-power, three-axis accelerometer is interfaced through an I2C bus and two
GPIO signals as shown in Table 3 below. By default, the I2C address is 0x1D (SA0 pulled high).
Table 3. Accelerometer Signal Connections
MMA8451Q
KL25Z128
SCL
PTE24
SDA
PTE25
INT1
PTA14
INT2
PTA15
RGB LED
Three PWM-capable KL25Z128 signals are connected to a red, green, blue LED. The signal connections
are shown in Table 4 below.
Table 4. RGB LED Signal Connections
RGB LED
KL25Z128
Red Cathode
PTB18
Green Cathode
PTB19
Blue Cathode
PTD1 1
Notes:
1) PTD1 (also known as D13) is also connected to the I/O header on J2 pin 10.
Input/Output Headers
The KL25Z128VLK4 microcontroller is packaged in an 80-pin LQFP. Some pins are utilized in on-board
circuitry, but many are directly connected to one of four I/O headers.
The pins on the KL25Z microcontroller are named for their general purpose input/output port pin
function. For example, the 1st pin on Port A is referred to as PTA1. The I/O connector pin names are
given the same name as the KL25Z pin connected to it, where applicable.
<<To Do: Diagram of IO headers w/ pin names overlaid>>
Note that all pinout data is available in spreadsheet format. See the Reference Documents section for
details.
<<To Do: Format tables of I/O header data as an appendix. Sort by KL25Z pin #, pin name, and header
pin number>>
Arduino Compatibility
The I/O headers on the FRDM-KL25Z are arranged to allow compatibility with peripheral boards (know
as shields) that connect to Arduino and Arduino-compatible microcontroller boards. The outer rows of
pins (the even numbered pins) on the headers share the same mechanical spacing and placement as
the I/O headers on the Arduino Uno Revision 3 board design.

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<<To Do: add note about 3.3V vs. 5V systems and IOREF pin >>