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2024年2月17日发(作者：承星儿)

FRDM-KL25Z

User Manual

Rev. 0

Freescale Semiconductor Inc.

FRDMKL25ZUM

Table of Contents

Overview ..................................................................................................................................................... 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 7

Revision History

Revision

Date

Changes

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FRDM-KL25Z User Manual Page 2 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

OpenSDA User’s Guide

- Spreadsheet of all microcontroller and I/O header pin

connections.

- 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

OpenSDA USB (J7)

KL25Z USB (J5)

VIN Pin

3.3V Pin

Coin Cell Battery

Valid Range

4.3-9V

1.71-3.6V

OpenSDA Regulated on-Operational? board?

Yes Yes

No Yes

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).

Power supplied from the OpenSDA USB connector (J7). A Schottky

P5V_SDA

diode provides back drive protection.

Power supplied from the KL25Z USB connector (J5). A Schottky diode

P5V_KL25Z

provides back drive protection.

Regulated 3.3V supply. Sources power to the P3V3 supply rail

P3V3_VREG

through a back drive protection Schottky diode.

Coin cell battery supply voltage. Sources power to the P3V3 supply

P3V3_BATT

rail through a back drive protection Schottky diode.

Main supply rail for the FRDM-KL25Z assembly. May be sourced from

P3V3

P3V3_VREG, P3V3_BATT, or directly from the I/O headers (J9 pin 8)

KL25Z MCU supply. Header J4 provides a convenient means for

P3V3_KL25Z

energy consumption measurements.

OpenSDA circuit supply. Header J3 provides a convenient means for

P3V3_SDA

energy consumption measurements.

Nominal 5V supplied to the I/O headers (J9 pin 10). Sourced from

P5V_USB 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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IOREF pin >>

Serial and Debug Adapter (OpenSDA)

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.

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.

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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

SCL

SDA

INT1

INT2

KL25Z128

PTE24

PTE25

PTA14

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

Red Cathode

Green Cathode

Blue Cathode

KL25Z128

PTB18

PTB19

PTD1

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.

Note that all pinout data is available in spreadsheet format. See the Reference Documents section for

details.

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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