Freescale Semiconductor FRDM-KL27Z Manuale utente

Freescale Semiconductor, Inc.

User’s Guide

1 Introduction

The Freescale Freedom development board 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 KL27Z Freedom board (FRDM-KL27Z) is a

simple, yet sophisticated design featuring a Kinetis L series

microcontroller KL27Z, a 3.3V microcontroller built on the

ARM® Cortex®-M0+ core.

The Kinetis L series is the most scalable portfolio of

low-power, robust, mixed signal 32-bit ARM Cortex-M0+

MCUs running up to 48 MHz in the industry. It supports

power supply voltage range from 1.71V to 3.6V, ambient

operating temperature ranges from -40°C to 105°C and

includes up to 64 KB flash.

The FRDM-KL27Z includes 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.

Document Number: FRDMKL27ZUG

Rev. 0, 02/2015

Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2. Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3. Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

4. FRDM-KL27Z hardware overview . . . . . . . . . . . . . . . 2

5. FRDM-KL27Z hardware description . . . . . . . . . . . . . 4

5.1. Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5.2. Serial and debug adapter (OpenSDA) . . . . . . . . . . . . . 6

5.3. Debugging interface . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.4. Virtual serial port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.5. Clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.6. Serial port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.7. Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.8. Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.9. Capacitive touch slider . . . . . . . . . . . . . . . . . . . . . . . . 8

5.10. 6-axis accelerometer and magnetometer . . . . . . . . . . . 9

5.11. RGB LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.12. Input/output headers . . . . . . . . . . . . . . . . . . . . . . . . . 11

5.13. Arduino compatibility . . . . . . . . . . . . . . . . . . . . . . . . 11

6. Using the FRDM-KL27Z with EEMBC ULPBench . 12

6.1. Hardware modifications required for EnergyMonitor 12

6.2. Programming the ULPBench device software . . . . . 12

6.3. Hardware configuration . . . . . . . . . . . . . . . . . . . . . . . 12

6.4. EnergyMonitor connections . . . . . . . . . . . . . . . . . . . 13

7. Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

FRDM-KL27Z User’s Guide

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2Freescale Semiconductor, Inc.

Reference documents

There are also many software development tool options available to the user. Choices include Kinetis

Design Studio (KDS), IAR Embedded Workbench, Keil MDK featuring the µVision IDE, etc.

All of these features combine to give users the freedom 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.

2 Reference documents

• OpenSDA User’s Guide: A guide for users of the OpenSDA embedded circuit

• KL27 Sub-Family Reference Manual: A reference manual for KL27 sub-family devices

• Arduino Overview: A guide to the Arduino platform

• Arduino Uno: A guide to Arduino Uno revision

3 Getting started

Refer to the FRDM-KL27Z Quick Start Package for step-by-step instructions for getting started with the

freedom board. See the “Jump Start Your Design” section at freescale.com/FRDM-KL27Z for the Quick

Start Package and software lab guides.

4 FRDM-KL27Z hardware overview

The FRDM-KL27Z hardware is a Freescale Freedom development board assembled with the following

features:

• Kinetis L series KL27 family MCU MKL27Z64VLH4 in an 64 LQFP package

• On-board serial and debug adapter (OpenSDA)

• I/O headers for easy access to MCU I/O pins

• Freescale inertial sensor, MMA8451Q, Magnetometer MAG3110

• Capacitive touch slider

• Reset pushbutton

• NMI and LLWU buttons

• RGB LED

• Infrared communication

• Thermistor sensor

• Supports the EEMBC ULPBench benchmark

Figure 1 shows a block diagram of the FRDM-KL27Z board.

FRDMKL27Z User’s Guide, Rev. 0, 02/2015

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FRDM-KL27Z hardware overview

Figure 1. FRDM-KL27Z block diagram

The FRDM-KL27Z features two microcontrollers (MCUs): the target MCU and a serial and debug adapter

(OpenSDA) MCU. The target MCU is a Kinetis series KL27 family device, the KL27Z64VLH4. The

OpenSDA MCU is a Kinetis K series K20 family device, the K20DX128VFM5.

Features of the KL27Z64VLH4 target MCU include:

• 32-bit ARM Cortex-M0+ core

— Up to 48 MHz operation

— Single-cycle fast I/O access port

• Memories

— 64 KB flash

— 16 KB SRAM

— 16 KB ROM with build-in bootloader

— 32 bytes regfile

• System integration

— 4-channel DMA controller

— Watchdog

— Low-leakage wakeup unit

— SWD debug interface and Micro Trace Buffer

— Bit Manipulation Engine

•Clocks

— 48 MHz high accuracy internal reference clock

— 8/2 MHz low power internal reference clock

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FRDM-KL27Z hardware description

— 32-40 kHz, or 3-32 MHz crystal oscillator

— 1 kHz LPO clock

• Analog peripherals

— 16-bit SAR ADC with internal voltage reference, up to 17 channels

— High-speed analog comparator containing a 6-bit DAC and programmable reference input

— 1.2 V voltage reference (Vref)

• Communication peripherals

— USB full-speed slave controller supporting crystal-less recovery

— Two 16-bit SPI modules

— One UART module supporting ISO7816

— Two LPUART modules

—TwoI

2C modules supporting up to 1 Mbit/s

— One FlexIO module

•Timers

— One 6-channel Timer/PWM module

— Two 2-channel Timer/PWM modules

— One low-power timer

— Periodic interrupt timer

— Real-time clock

• Security

— 80-bit unique identification number per chip

• Human-Machine Interfaces (HMI)

— Up to 54 general purpose input/output (GPIO)

— GPIO interrupt

— External input pin for LLWU in LLS and VLLSx mode

5 FRDM-KL27Z hardware description

5.1 Power supply

The FRDM-KL27Z offers a design with multiple power supply options. It can be powered from the USB

connector, battery on the board, the VIN pin on the I/O header, 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. Figure 2

shows the schematic drawing for the power supply inputs and the on-board voltage regulator.

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FRDM-KL27Z hardware description

Figure 2. FRDM-KL27Z power supply

Table 1 provides the operational details and requirements for the power supplies.

NOTE

The OpenSDA circuit is only operational when a USB cable is connected

and supplying power to J13. However, the protection circuitry is in place to

allow multiple sources to be powered at once.

Table 1. Tower supply requirements

Supply Source Valid Range OpenSDA

Operational?

Regulated

On-board?

OpenSDA USB (J13) 5V Yes Yes

Mini USB(J10) 5V No Yes

P5V0-9V0_VIN Pin on I/O header 4.3-9V No Yes

P3V3 Pin on I/O header 1.71-3.6V No No

Battery 2-3.6V No No

Table 2. FRDM-KL27Z power supplies

Power Supply Name Description

P5V0-9V0_VIN Power supplied from the VIN pin of the I/O headers (J3 pin 16).

P5V_SDA Power supplied from the OpenSDA USB connector (J13).

P5V_KL27Z Power supplied from the Mini USB connector (J10).

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FRDM-KL27Z hardware description

NOTES

J9 and J17 are not populated by default. The two pins of these headers are

in parallel with 0 Ωresistors. In addition, J17 is also in parallel with a 10 Ω

resistor. To measure the energy consumption of the KL27Z, either a

voltmeter or an ammeter may be used. To use a voltmeter, R2 (0 Ω) must be

removed before connecting the voltmeter probes to the pins of J17. Both R1

and R2 (10 Ω) must be removed to measure current with an ammeter. For

the OpenSDA MCU, energy consumption can be measured by removing R4

(0 Ω) and connecting ammeter probes to the pins of J9.

5.2 Serial and debug adapter (OpenSDA)

OpenSDA is an open-standard serial and debug adapter. It bridges serial and debug communications

between a USB host and an embedded target processor as shown in Figure 3. The hardware circuit is

based on a Freescale Kinetis K20 family MCU with 128 KB of embedded flash and an integrated USB

controller. OpenSDA features a mass storage device (MSD) bootloader, which provides a quick and easy

mechanism for loading different OpenSDA Applications such as flash programmers, run-control debug

interfaces, serial-to-USB converters, and more. Two or more OpenSDA applications can run simulta-

neously. For example, run-control debug application and serial-to-USB converter runs in parallel to pro-

vide a virtual COM communication interface while allowing code debugging via OpenSDA with just a

single USB connection. These two applications are provided in a single code package. Refer to the

OpenSDA User’s Guide for more details.

Figure 3. OpenSDA block diagram

P3V3_VREG Regulated 3.3V supply. Sources power to the P3V3 supply rail through an optional back drive

protection Schottky diode.

P3V3 Main supply rail for the FRDM-KL27Z. Can be sourced from P3V3_VREG.

P3V3_KL27Z KL27Z MCU power supply. Header J17 provides a convenient means for KL27Z energy consumption

measurements.

P3V3_SDA OpenSDA circuit power supply.

Table 2. FRDM-KL27Z power supplies

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FRDM-KL27Z hardware description

OpenSDA is managed by a Kinetis K20 MCU built on the ARM Cortex-M4 core. The OpenSDA circuit

includes a status LED (D8) and a RESET pushbutton (SW2). The pushbutton asserts the Reset signal to

the KL27Z target MCU. It can also be used to place the OpenSDA circuit into Bootloader mode by holding

down the RESET pushbutton while plugging the USB cable to USB connector J13. Once the OpenSDA

enters bootloader mode, other OpenSDA applications such as debug app can be programmed.

SPI and GPIO signals provide an interface to the SWD debug port of the KL27Z. Additionally, signal

connections are available to implement a UART serial channel. The OpenSDA circuit receives power

when the USB connector J13 is plugged into a USB host.

5.3 Debugging interface

Signals with SPI and GPIO capability are used to connect directly to the SWD of the KL27Z. These signals

are also brought out to a standard 10-pin (0.05”) Cortex Debug connector (J11) as shown in Figure 4. It is

possible to isolate the KL27Z MCU from the OpenSDA circuit and use J11 to connect to an off-board

MCU. To accomplish this, cut the trace between pin1 and pin2 of J18 on bottom layer. This will disconnect

the SWD_CLK pin to the KL27Z so that it will interfere with the communications to an off-board MCU

connected to J11.

Figure 4. SWD debug connector to KL27Z

5.4 Virtual serial port

A serial port connection is available between the OpenSDA MCU and LPUART0 pin PTA1(TXD) and

PTA2 (RXD) of KL27Z. Several of the default OpenSDA Applications provided by Freescale, including

the MSD Flash Programmer and the P&E Debug Application, provide a USB Communications Device

Class (CDC) interface that bridges serial communications between the USB host and this serial interface

on the KL27Z.

5.5 Clock source

The Kinetis KL27 microcontrollers feature an on-chip oscillator compatible with input crystal: 32 to 40

KHz or 3 to 32 MHz. The KL27Z on the FRDM-KL27Z is clocked from the internal clock LIRC (2 MHz/8

MHz) or HIRC (48 MHz), and on-board 32768 Hz crystal for the RTC clock source.

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FRDM-KL27Z hardware description

5.6 Serial port

The serial port interface signals used with OpenSDA are LPUART0 pin PTA1 (TXD) and PTA2 (RXD).

These signals are also connected to I/O header J1.

5.7 Reset

The RESET signal on the KL27Z is connected externally to a pushbutton, SW2. 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 when plugging the USB cable to J13. Refer to Section 5.2, “Serial

and debug adapter (OpenSDA)” for more details.

5.8 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-KL27Z is the onboard OpenSDA circuit. However, a 2x5-pin

(0.05”) Cortex Debug connector, J11, provides access to the SWD signals for the KL27Z MCU. Table 3

shows SWD connector signals description for KL27Z.

5.9 Capacitive touch slider

Two GPIO pins functioning as Touch Sense Input (TSI) signals, are connected to capacitive electrodes

configured as a touch slider as shown in Figure 5.

Table 3. ARM JTAG/SWD mini connector description

Pin Function Connection to KL27Z

1 VTref P3V3_MCU

2 SWDIO/TMS PTA3

3GND GND

4SWDCLK/TCK PTA0

5GND GND

6 SWO/TDO NC

7NC NC

8 TDI NC

9NC NC

10 RESET PTA20

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FRDM-KL27Z hardware description

Figure 5. Touch slider connection

5.10 6-axis accelerometer and magnetometer

A Freescale MMA8451Q low-power, three-axis accelerometer is interfaced through an I2C bus and two

GPIO signals as shown in Table 4. By default, the I2C address is 0x1D (SA0 pulled high).

Figure 6. Accelerometer connection

Table 4. Accelerometer signal connections

MMA8451Q KL27Z

SCL PTD7

SDA PTD6

INT1 PTC3

INT2 PTC2

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FRDM-KL27Z hardware description

This also designed to be compatible with 6-axis (FXOS8700CQ) combination of accelerometer and

magnetometer sensor, if populating the U10 (FXOS8700CQ), and then keep U2 (MAG3310) DNP.

Otherwise, populate U10 (MMA8451) and U2 (MAG3110).

A Freescale MAG3110 low-power, three-axis magnetometer is interfaced through an I2C bus and one

GPIO signals as shown in Table 5. By default, the I2C address is 0x0E .

Figure 7. Magnetometer connection

5.11 RGB LED

Three PWM-capable KL27Z signals are connected to a red, green, and blue LED. The signal connections

are shown in Table 6.

Table 5. Magnetometer signal connections

MMA8451Q KL27Z

SCL PTD7

SDA PTD6

INT1 PTC2

Table 6. RGB LED signal connections

RGB LED KL27Z

Red Cathode PTB18

Green Cathode PTB19

Blue Cathode PTA13

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