Freescale Semiconductor
Document Number: FRDMKE04ZUM
User's Guide
FRDM-KE04Z User’s Guide
User Guide
by: Wang Peng
Rev 0, 02/2014
Contents
1 Overview
The Freescale Freedom development platform is an ideal
evaluation and development tool 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 KE04Z Freedom board (FRDM-KE04Z) is a
simple, yet sophisticated design featuring a Kinetis E series
microcontroller KE04Z, a 5 V microcontroller built on the
ARM® Cortex®-M0+ core.
The Kinetis E series is the most scalable portfolio of lowpower, high-robustness, mixed signal 32-bit ARM CortexM0+ MCUs running up to 48 MHz in the industry. It supports
power supply voltage range from 2.7 V to 5.5 V, ambient
operating temperature ranges from -40 °C to 105 °C and
includes up to 128 KB flash.
The FRDM-KE04Z board includes the Freescale open
standard embedded serial and debug adapter known as
OpenSDA. This circuit offers several options for serial
communications, flash programming and run-control
debugging to the user.
There are also many software development tool options
available to the user. Choices include CodeWarrior for
Microcontrollers, IAR Embedded Workbench, Keil MDK
1 Overview....................................................................1
2 Getting started........................................................... 2
3 FRDM-KE04Z hardware overview...........................2
4 FRDM-KE04Z hardware description........................4
4.1 Power supply...................... ........................... 4
4.2 Serial and Debug Adapter
(OpenSDA).....................................................5
4.2.1 Debugging interface.........................6
4.2.2 Virtual serial port.......... .................. 7
4.3 KE04Z microcontroller............ ......................7
4.3.1 Clock Source.............. ..................... 7
4.4 Infrared port................................................... 8
4.5 Capacitive touch slider............. ..................... 9
4.6 Three-axis accelerometer..............................10
4.7 RGB LED.......................... .......................... 11
4.8 Input/Output headers....................................12
4.9 Arduino compatibility..................................13
5 References.............................. ................................. 13
6 Revision history.......................... ............................ 14
© 2014 Freescale Semiconductor, Inc.
Getting started
featuring the µVision IDE, Red Suite from Code Red Technologies, Atollic TrueSTUDIO, Rowley Crossworks, and more.
All of these features are combined to give freedom to the user to rapidly prototype the 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 Getting started
Refer to the FRDM-KE04Z Quick Start Package for step-by-step instructions for getting started with the Freedom board. See
Quick Start Package and Software Lab guides available on freescale.com.
3 FRDM-KE04Z hardware overview
The FRDM-KE04Z hardware is a Freescale Freedom development platform microcontroller board assembled with the
following features:
• Kinetis E Series KE04 family MCU MKE04Z8VFK4 in an 24 QFN package
• Onboard serial and debug adapter (OpenSDA)
• I/O headers for easy access to MCU I/O pins
• Freescale inertial sensor, MMA8451Q
• Capacitive touch slider
• Reset pushbutton
• RGB LED
• Infrared communication
• Motor control header for simple BLDC motor control on APMOTOR56F8000E
Figure 1 shows the block diagram of FRDM-KE04Z board.
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FRDM-KE04Z hardware overview
Figure 1. FRDM-KE04Z block diagram
The FRDM-KE04Z features two microcontrollers (MCUs): the target MCU and the serial and debug adapter (OpenSDA)
MCU. The target MCU is a Kinetis E series KE04 family device, the KE04Z8VFK4. The OpenSDA MCU is a Kinetis K
series K20 family device, the K20DX128VFM5.
Features of the KE04Z8VFK4 target MCU include:
• 32-bit ARM Cortex-M0+ core
• Up to 48 MHz operation
• Single-cycle fast I/O access port
• Aliased SRAM bitband region
• Memories
• 8 KB flash
• 1 KB SRAM
• System integration
• Power management and mode controllers
• Low-leakage wakeup unit
• Bit manipulation engine (BME) for read-modify-write peripheral operations
• Clock
• Clock generation module with FLL for system and CPU clock generation
• 32 kHz internal reference clock
• System oscillator supporting external crystal or resonator
• Low-power 1 kHz RC oscillator for RTC and watchdog
• Analog peripherals
• 12-bit SAR ADC
• Two analog comparators
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FRDM-KE04Z hardware description
• Communication peripherals
• One 8-bit serial peripheral interface (SPI)
• One I2C module
• One UART module
• Timers
• One 6-channel FlexTimer module (FTM)
• One 2-channel timer/PWM module
• One 2-channel periodic interrupt timer (PIT)
• Real-time clock (RTC)
• System tick timer
• One watchdog module
• Security
• One CRC
• Human-Machine Interfaces (HMI)
• General purpose input/output controller
• Two 8-bit keyboard interrupt modules (KBI)
• External interrupt (IRQ)
FRDM-KE04Z hardware description
4
4.1
The FRDM-KE04Z offers a design with multiple power supply options. It can be powered from the USB connector, the VIN
pin on the I/O header, an off-board 1.71–3.6 V supply from the 3.3 V pin on the I/O header or 3.3 V from motor control
header. The USB and VIN supplies are regulated on-board using a 3.3 V linear regulator to produce the main power supply.
The other two sources are not regulated onboard. Figure 2 shows the schematic drawing for the power supply inputs and the
onboard voltage regulator.
Power supply
Figure 2. FRDM-KE04Z block diagram
Table 1 provides operational details and requirements for the power supplies.
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FRDM-KE04Z hardware description
Table 1. Power supply requirements
Supply source Valid range OpenSDA operational? Regulated onboard?
OpenSDA USB (J7) 5 V >Yes Yes
VIN pin on I/O header 4.3–9 V Yes Yes
3.3V pin on I/O header 1.71–3.6 V Yes No
3.3V pin on motor control
header
3.3 V Yes No
NOTE
The OpenSDA circuit is only operational when a USB cable is connected and supplying
power to J6. However, the protection circuitry is in place to enable multiple sources to be
powered at once.
Table 2. FRDM-KE04Z power supplies
Power supply name Description
P5–9V_VIN Power supplied from the VIN pin of the I/O headers (J4 pin 16).
P5V_SDA Power supplied from the OpenSDA USB connector (J6).
P3V3_VREG Regulated 3.3 V supply. Sources power to the P3V3 supply rail through a back drive protection
Schottky diode.
P3V3 Main supply rail for the FRDM-KE04Z. Can be sourced from P3V3_VREG, or directly from the I/O
headers (J4 pin 8), or from P3V3_MOTOR.
P3V3_KE04Z KE04Z MCU power supply. Header J9 provides a convenient means for KE04Z energy
consumption measurements.
P3V3_SDA OpenSDA circuit power supply. Header J10 provides a convenient means for K20 energy
consumption measurements.
P5V_USB Nominal 5 V supplied to the I/O headers (J4 pin 10). Sourced from P5V_SDA supply through a
back drive protection Schottky diode.
P3V3_MOTOR 3.3 V supply from motor control header.
NOTE
• J9 and J10 are not populated by default on the production version. The two pins of
these headers are shorted together using the 0 Ω resistors R12 and R26 on the PCB.
To measure the energy consumption of either KE04Z or OpenSDA MCU, the 0 Ω
resistor 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. When the MCU current measurement is done complete and no longer
required, the 0 Ω resistors can be soldered on again.
• To get ADC accuracy on KE04Z, it is recommended that a 0 Ω resistor R13 be
soldered on and ensure there is no power supply from P3V3_MOTOR and P3V3
sourced from I/O headers.
4.2
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
microcontroller (MCU) with 128 KB of embedded flash and an integrated USB controller. OpenSDA features a mass storage
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FRDM-KE04Z hardware description
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 simultaneously. For example, run-control debug application and serial-to-USB converter runs in parallel to provide 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.
For more details, refer to the OpenSDA User’s Guide available on freescale.com.
Figure 3. OpenSDA block diagram
OpenSDA is managed by a Kinetis K20 MCU built on the ARM Cortex-M4 core. The OpenSDA circuit includes a status
LED (D4) and a RESET pushbutton (SW1). The pushbutton asserts the reset signal to the KE04Z 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 J6. After the OpenSDA enters bootloader mode, other OpenSDA applications such as the debug
application can be programmed.
SPI and GPIO signals provide an interface to the SWD debug port of KE04Z. Additionally, signal connections are available
to implement a UART serial channel. The OpenSDA circuit receives power when the USB connector J6 is plugged into a
USB host.
4.2.1
Signals with SPI and GPIO capability are used to connect directly to the SWD of KE04Z. These signals are also brought out
to a standard 10-pin (0.05”) Cortex debug connector (J7) as shown in Figure 4. It is possible to isolate the KE04Z MCU from
the OpenSDA circuit and use J7 to connect to an off-board MCU. To accomplish this, cut the 0 Ω resistor R58. This will
disconnect the SWD_CLK pin to the KE04Z so that it will not interfere with the communications to an off-board MCU
connected to J7.
Debugging interface
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KE04Z microcontroller
Figure 4. FRDM-KE04Z block diagram
4.2.2 Virtual serial port
A serial port connection is available between the OpenSDA MCU and UART0 pin PTB1 (TXD) and PTB0 (RXD) of
KE04Z. Freescale provides several default OpenSDA applications, such as the MSD Flash Programmer and the P&E Debug
Application which provide a USB communication Device Class (CDC) interface that bridges serial communication between
the USB host and its serial interface on KE04Z MCU.
4.3
4.3.1
The Kinetis KE04 microcontrollers feature an on-chip oscillator compatible with two ranges of input crystal or resonator
frequencies: 32 kHz (low-frequency mode) and 4–20 MHz (high-frequency mode).
The KE04Z on the FRDM-KE04Z is clocked from a 8 MHz crystal.
4.3.1.1
The serial port interface signals used with OpenSDA are UART0 pin PTB1 (TXD) and PTB0 (RXD). These signals are also
connected to I/O header J1.
4.3.1.2
The PTA5/RESET signal on the KE04Z is externally connected to a pushbutton, SW1. The reset button can be used to force
an external reset event in the target MCU. It can also be used to force the OpenSDA circuit into bootloader mode when
plugging the USB cable to J6. For more details, see Serial and Debug Adapter (OpenSDA) section.
KE04Z microcontroller
Clock Source
Serial port
Reset
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KE04Z microcontroller
4.3.1.3 Debug
The sole debug interface on all Kinetis E series devices is a Serial Wire Debug (SWD) port. The primary controller of this
interface on the FRDM-KE04Z is the onboard OpenSDA circuit. However, a 2x5-pin (0.05”) Cortex Debug connector, J7,
provides access to the SWD signals for the KE04Z MCU. The following table shows SWD connector signals description for
KE04Z:
Table 3. ARM JTAG/SWD mini connector description
Pin Function Connection to KE04Z
1 VTref 3.3V system power supply (V_BRD)
2 SWDIO/TMS PTA4/SWD_DIO
3 GND GND
4 SWDCLK/TCK PTA0/SWD_CLK
5 GND GND
6 SWO/TDO NC
7 NC NC
8 TDI NC
9 NC NC
10 RESET PTA5/RESET
4.4 Infrared port
One infrared Rx port and one Tx port, as shown in Figure 5 , are connected to ACMP0 input pin (ACMP0_IN1) and UART0
TXD0 pin of KE04Z to demonstrate the capability of UART0 modulated by the Flextimer module for generating infrared
signals and use ACMP0 as a filter to receive the SCI data via infrared signal.
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KE04Z microcontroller
Figure 5. Infrared connection
4.5
Two GPIO pins, functioning as Touch Sense Input (TSI) signals, are connected to capacitive electrodes configured as a touch
slider as shown in the following figure:
Capacitive touch slider
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KE04Z microcontroller
Figure 6. Touch slider connection
4.6
A Freescale MMA8451Q low-power, and 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).
Three-axis accelerometer
Table 4. Accelerometer signal connections
MMA8451Q KE04Z
SCL PTA3
SDA PTA2
INT1 PTC0
INT2 -
The application circuit of MMA8451 is represented as follows:
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KE04Z microcontroller
Figure 7. Accelerometer connection
4.7
Three PWM-capable KE04Z signals are connected to red, green, and blue LED. The signal connections are shown in Table
5 .
RGB LED
Table 5. RGB LED signal connections
RGB LED KE04Z
Red Cathode PTC5/FTM2CH3/BUSOUT
Green Cathode PTC4/FTM2CH2
Blue Cathode PTB3/FTM0CH0
The following figure represents the RGB LED circuit:
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KE04Z microcontroller
Figure 8. RGB LED connection
4.8
The MKE04Z8VFK4 microcontroller is packaged in a 24-pin QFN. Some pins are utilized in onboard circuitry, but many are
directly connected to one of four I/O headers (J1, J2, J3, and J4). J1 and J2 also function as motor control headers to provide
access to a motor control board, such as simple BLDC motor driving board APMOTOR56F8000E.
The following figure provides all the details of input/output headers:
Input/Output headers
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References
Figure 9. I/O headers
4.9
The I/O headers on the FRDM-KE04Z are arranged to enable compatibility with peripheral boards (known as shields) that
connect to Arduino and Arduino-compatible microcontroller boards. The pins on the headers share the same mechanical
spacing and placement as the I/O headers on the Arduino Uno Revision 3 board design. See Figure 9 for compatible signals.
5
Freescale Semiconductor, Inc. 13
Arduino compatibility
References
•
OpenSDA User's Guide (document OSDAUG), available at freescale.com
•
KE04 Sub-Family Reference Manual, available at freescale.com
FRDM-KE04Z User’s Guide, Rev 0, 02/2014
Revision history
•
Arduino Overview, available at wikipedia.com
•
Arduino Uno, available at www.arduino.cc/en/Main/arduinoBoardUno
6 Revision history
Table 6. Revision history
Revision number Date Substaitial changes
0 02/2014 Initial release
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How to Reach Us:
Home Page:
freescale.com
Web Support:
freescale.com/support
Information in this document is provided solely to enable system and
software implementers to use Freescale products. There are no express
or implied copyright licenses granted hereunder to design or fabricate
any integrated circuits based on the information in this document.
Freescale reserves the right to make changes without further notice to
any products herein. Freescale makes no warranty, representation, or
guarantee regarding the suitability of its products for any particular
purpose, nor does Freescale assume any liability arising out of the
application or use of any product or circuit, and specifically disclaims
any and all liability, including without limitation consequential or
incidental damages. “Typical” parameters that may be provided in
Freescale data sheets and/or specifications can and do vary in different
applications, and actual performance may vary over time. All operating
parameters, including “typicals,” must be validated for each customer
application by customer's technical experts. Freescale does not convey
any license under its patent rights nor the rights of others. Freescale
sells products pursuant to standard terms and conditions of sale, which
can be found at the following address: freescale.com/
SalesTermsandConditions.
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the property of their respective owners.
© 2014 Freescale Semiconductor, Inc.
Document Number FRDMKE04ZUM
Revision 0, 02/2014
How to Reach Us:
Home Page:
freescale.com
Web Support:
freescale.com/support
Information in this document is provided solely to enable system and software
implementers to use Freescale products. There are no express or implied copyright
licenses granted hereunder to design or fabricate any integrated circuits based on the
information in this document.
Freescale reserves the right to make changes without further notice to any products
herein. Freescale makes no warranty, representation, or guarantee regarding the
suitability of its products for any particular purpose, nor does Freescale assume any
liability arising out of the application or use of any product or circuit, and specifically
disclaims any and all liability, including without limitation consequential or incidental
damages. “Typical” parameters that may be provided in Freescale data sheets and/or
specifications can and do vary in different applications, and actual performance may
vary over time. All operating parameters, including “typicals,” must be validated for
each customer application by customer’s technical experts. Freescale does not convey
any license under its patent rights nor the rights of others. Freescale sells products
pursuant to standard terms and conditions of sale, which can be found at the following
address: freescale.com/SalesTermsandConditions.
Freescale, the Freescale logo, and Kinetis are trademarks of Freescale
Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other product or service names are
the property of their respective owners. ARM and Cortex are registered trademarks of
ARM Limited (or its subsidiaries) in the EU and/or elsewhere. All rights reserved.
© 2014 Freescale Semiconductor, Inc.
Document Number: FRDMKE04ZUM
Rev. 0
02/2014
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