Freescale Semiconductor FRDM-KL25Z Manuale utente

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

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

FRDMKL25ZUM FRDM-KL25Z User Manual Page 4 of 10

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

FRDMKL25ZUM FRDM-KL25Z User Manual Page 5 of 10

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

FRDMKL25ZUM FRDM-KL25Z User Manual Page 6 of 10

-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)

Yes

KL25Z USB (J5)

Yes

VIN Pin

4.3-9V

Yes

3.3V Pin

1.71-3.6V

Coin Cell Battery

1.71-3.6V

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.

FRDMKL25ZUM FRDM-KL25Z User Manual Page 7 of 10

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.

FRDMKL25ZUM FRDM-KL25Z User Manual Page 8 of 10

<<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>>

FRDMKL25ZUM FRDM-KL25Z User Manual Page 9 of 10

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.

FRDMKL25ZUM FRDM-KL25Z User Manual Page 10 of 10

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

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