Freescale Semiconductor K20D72M Manual de usuario

Freescale Semiconductor Inc.

TWR-K20D72M

User Manual

Rev. 1.1

TWR-K20D72M User’s Manual Page 2 of 17

Contents

1 TWR-K20D72M Overview ......................................................................................................................4

1.1 Features..................................................................................................................................................................................4

1.2 Getting started .....................................................................................................................................................................5

1.3 Reference Documents.......................................................................................................................................................5

2 Hardware Description.............................................................................................................................5

2.1 K20D72M Microcontroller..............................................................................................................................................6

2.2 Clocking ..................................................................................................................................................................................7

2.3 System Power.......................................................................................................................................................................7

2.3.1 Board Power Select ...........................................................................................................................................................................7

2.3.2 RTC VBAT ..............................................................................................................................................................................................7

2.4 Debug Interface ...................................................................................................................................................................8

2.4.1 OSJTAG ....................................................................................................................................................................................................8

2.4.2 Cortex Debug Connector .................................................................................................................................................................8

2.5 USB Interface........................................................................................................................................................................9

2.6 Infrared Port.........................................................................................................................................................................9

2.7 External Bus Interface – FlexBus..................................................................................................................................9

2.8 Accelerometer......................................................................................................................................................................9

2.9 Potentiometer, Pushbuttons, LEDs .............................................................................................................................9

2.10 General Purpose Tower Plug-in (TWRPI) Socket............................................................................................ 10

2.11 Touch Interface.............................................................................................................................................................. 10

2.12 Microphone and buzzer.............................................................................................................................................. 11

3 Jumper Table ........................................................................................................................................... 12

4 Input/Output Connectors and Pin Usage Table........................................................................... 13

5 Elevator Connections ............................................................................................................................ 15

TWR-K20D72M User’s Manual Page 3 of 17

List of Figures

Figure 1. Front side of TWR-K20D72M module.......................................................................................... 4

Figure 2. Back side of TWR-K20D72M module........................................................................................... 5

Figure 3.TWR-K20D72M Block Diagram .................................................................................................... 6

Figure 4. Infrared Port Implementation ..................................................................................................... 9

List of Tables

Table 1. Cortex Debug Connector Pinout................................................................................................... 8

Table 2. TWRPI Socket Pin Description..................................................................................................... 10

Table 3. Touch TWRPI Pin Description ..................................................................................................... 11

Table 4. TWR-K20D72M Jumper Table..................................................................................................... 12

Table 5. I/O Connectors and Pin Usage Table .......................................................................................... 13

Table 6. TWR-K20D72M Primary Connector Pinout................................................................................. 15

Revision History

Revision Date Changes

0.1 March 15, 2011 Initial Release

TWR-K20D72M User’s Manual Page 4 of 17

1TWR-K20D72M Overview

The K20D72M Tower MCU Module (TWR-K20D72M) is a low-cost evaluation, demonstration and

development board, which features the Kinetis K20 72MHz low-power microcontroller. These devices

are based on the ARM® Cortex™-M4 architecture with USB 2.0 full-speed OTG controller. The TWR-

K20D72M microcontroller module can operate in stand-alone mode or as part of the Freescale Tower

System, a modular development platform that enables rapid prototyping and tool re-use through

reconfigurable hardware. Take your design to the next level and begin constructing your Tower

System today by visiting www.freescale.com/tower for additional Tower System microcontroller

modules and compatible peripherals.

1.1 Features

The following list summarizes the features of the K20D72M Tower MCU boards:

•Tower compatible processor board

•S08JM60 based Open Source BDM (OSBDM) circuit

•Four (4) user-controlled status LEDs

•Two (2) Capacitive Touch Pads and two (2) mechanical push buttons

•Socket for Capacitive Touch Pad daughter board (Touch TWRPI)

•Socket for Tower Plug-in (TWRPI, e.g. sensor board)

•Standalone USB host and device function

•Microphone and buzzer

•Potentiometer

•MMA8451Q three-axis accelerometer

•Battery holder for 20mm lithium battery (e.g. 2032, 2025)

•Board power select with 3.3V or 1.8V MCU operation

Figure 1. Front side of TWR-K20D72M module

TWR-K20D72M User’s Manual Page 5 of 17

Figure 2. Back side of TWR-K20D72M module

1.2 Getting started

Follow the Quick Start Guide found printed in the TWR-K20D72M box or the interactive DVD for the list

of recommended steps for getting started. There are also lab walk-through guides available on the

tool support page for the TWR-K20D72M: http://www.freescale.com/TWR-K20D72M.

1.3 Reference Documents

The documents listed below should be referenced for more information on the Kinetis family, Tower

System and the MCU modules. These can be found in the documentation section

of http://www.freescale.com/TWR-K20D72M or http://www.freescale.com/kinetis.

•TWR-K20D72M Quick Start Guide

•TWR-K20D72M Schematics

•K20 Family Product Brief

•K20 Family Reference Manual

•Kinetis Quick Reference User Guide (KQRUG)

2Hardware Description

The TWR-K20D72M is a Tower System module featuring the MK20DX256VLL7 – an ARM® Cortex-M4™

based microcontroller with USB 2.0 full-speed OTG controllers in a 100LQFP package with a maximum

core operating frequency of 72MHz. It is intended for use in the Freescale Tower System but can

operate stand-alone. An on-board debug circuit, OSJTAG, provides a JTAG debug interface and a

power supply input through a single USB mini-AB connector. Figure 3 shows a block diagram for the

TWR-K20D72M.The following sections describe the hardware in more detail.

TWR-K20D72M User’s Manual Page 6 of 17

OSJTAG

JTAG, Power, SCI K20D72M

100 LQFP

(socket-IC

footprint)

USB

Mini-AB

Tower Elevator Expansion Connectors

S, SPI, I

C, USB, ADC, DAC, FTM, UARTs, Flexbus

8 MHz XTAL

SCI

Freescale Silicon External Connectors Interface Circuits Power

MMA8451Q

Infrared Port

IR Output

20-Pin

Header

Comparator

GPIO / Interrupts

ADC

Reset

LED

32.768 KHz XTAL

3.3V

5.0V

Tower Plug-in

(TWRPI)

Sensor Socket

SPI, I

C, ADC, GPIO

Tower Plug-in

(TWRPI)

Touch

TSI, GPIO Capacitive

Touch

Pads

LED

Microphone/

amplifier

ADC

JTAG

USB Device/host

Micro

USB

VBAT (RTC)

General purpose

Tower Plug-in

(TWRPI)

3.3V

Regulator

1.8V

Regulator

Battery holder

Buzzer FTM

Figure 3: TWR-K20D72M Block Diagram

2.1 K20D72M Microcontroller

The TWR-K20D72M module features the MK20DX256VLL7.The Kinetis K20 microcontroller family is

part of the Kinetis portfolio of devices built around an ARM® Cortex-M4™ core. Refer to the K20

Family Product Brief and the K20 Family Reference Manual for comprehensive information on the

MK20DX256VLL7 device. MK20DX256VLL7key features:

•32-bit ARM Cortex-M4 core with DSP instructions

•72MHz maximum core operating frequency

•100LQFP, 14mm x 14mm, 0.5mm pitch package

•1.71V – 3.6V operating voltage input range

•256 Kbytes of program flash, 64 Kbytes of static RAM

•External bus interface

•Power management controller with 10 different power modes

•Multi-purpose clock generator with PLL and FLL operation modes

•16-bit SAR ADC, 12-bit DAC

•High-speed analog comparator with 6-bit DAC

TWR-K20D72M User’s Manual Page 7 of 17

•Programmable voltage reference

•USB full-speed/low-speed OTG/Host/Device controller with device charge detect

•SPI, I2C (w/ SMBUS support), UART (w/ ISO7816 and IrDA), CAN, I2S

•GPIO with pin interrupt support, DMA request capability, digital glitch filtering

•Capacitive touch sensing inputs (TSI)

•Debug interfaces: JTAG, cJTAG, SWD

•Trace: TPIO, FPB, DWT, ITM

2.2 Clocking

The Kinetis MCUs start up from an internal digitally controlled oscillator (DCO). Software can enable

one or two external oscillators if desired. The external oscillator for the multipurpose clock generator

(MCG) module can range from 32.768 KHz up to a 32 MHz crystal or ceramic resonator. The external

oscillator for the real time clock (RTC) module accepts a 32.768 kHz crystal.

Two crystals are provided on board for clocking the K20D72M device: 8 MHz crystal as main oscillator

to clock MCG module and 32.768 kHz crystal for clocking RTC module.

2.3 System Power

In standalone operation, the main power source for the TWR-K20D72M is derived from the 5.0V input

from either the USB mini-B connector, J14 or the debugger header, J11, when a shunt is placed on

jumper J10. On board low-dropout regulator provides either 3.3V or 1.8V supply from the 5.0V input

voltage based on jumper settings on J17, refer to sheet 5 of the TWR-K20D72M schematic for details.

When installed into a Tower System, the TWR-K20D72M can be powered from either an on-board

source or from another source in the assembled Tower System. If both the on-board and off-board

sources are available, the TWR-K20D72M will default to the off-board source.

The 3.3V or 1.8V power supplied to the MCU is routed through a jumper, J6. The jumper shunt can be

removed to allow for either 1) alternate MCU supply voltages to be injected or 2) the measurement of

power consumed by the MCU.

2.3.1 Board Power Select

TWR-K20D72M board include on board regulators for both 3.3V and 1.8V output and add jumper J17

to select which one to use as board power and CPU power. This allows MCU operation under 1.8V

power supply.

2.3.2 RTC VBAT

The real time clock (RTC) module on the K20D72M has two modes of operation, system power-up and

system power-down. During system power-down, the RTC is powered from the backup power supply,

VBAT. The TWR-K20D72M provides a battery holder for a coin cell battery that can be used as the

TWR-K20D72M User’s Manual Page 8 of 17

VBAT supply. The holder can accept common 20mm diameter 3V lithium coin cell batteries (e.g. 2032,

2025). Refer to the description J13 in Table 4 “TWR-K20D72M Jumper Table” for more information.

2.4 Debug Interface

There are two debug interface options provided: the on-board OSJTAG circuit and an external Cortex

Debug connector.

2.4.1 OSJTAG

An on-board, MC9S08JM60 based Open Source BDM (OSBDM) circuit provides a debug interface to the

K20D72M. A standard USB A male to Mini-B male cable (provided) can be used for debugging via the

USB connector, J14. The OSJTAG interface also provides a USB to serial bridge. Drivers for the OSJTAG

interface are provided in the P&E Micro Kinetis Tower Toolkit (available on the included DVD).

2.4.2 Cortex Debug Connector

The Cortex Debug connector is a 20-pin (0.05") connector providing access to the SWD, SWV, JTAG,

cJTAG, EzPort signals available on the K20 device. The pinout and K20 pin connections to the debug

connector, J11, is shown in Table 1.

Table 1. Cortex Debug Connector Pinout

Pin Function TWR-K20D72M connection

1 VTref MCU supply (MCU_PWR)

2 TMS/SWDIO PTA3/UART0_RTS_b/FTM0_CH0/JTAG_MS/SWD_DIO

3 GND GND

4 TCK/SWCLK PTA0/UART0_CTS_b/FTM0_CH5/JTAG_CLK/SWD_CLK/EZP_CLK

5 GND GND

6 TDO/SWO PTA2/UART0_TX/FTM0_CH7/JTAG_DO/TRACE_SWO/EZP_DO

7 Key -

8 TDI PTA1/UART0_TX/FTM0_CH6/JTAG_DI/EZP_DI

9 GNDDetect PTA4/FTM0_CH1/MS/NMI_b/EZP_CS_b

10 nReset RESET_b

11 Target Power 5V supply (via J10)

13 Target Power 5V supply (via J10)

14 - -

15 GND GND

16 - -

17 GND GND

18 - -

19 GND GND

20 - -

TWR-K20D72M User’s Manual Page 9 of 17

Note:there are no ETM signals on K20D72M, so the associated signals on Cortex Debugger connector

is left empty.

2.5 USB Interface

TWR-K20D72M board allows using USB as host or device in standalone mode or with connection to

TWR-SER board in a complete tower kit. Jumper J16 can be used to select which USB VBUS signal from

USB connector to connect with the MCU VREGIN input pin. When using in standalone mode, short 5-6

on J16 and connect USB with on board Micro-USB connector J19, when using with TWR-SER board in

complete tower kit, short 6-8 on J16 and connect USB with Mini-AB connector J14 on TWR-SER board.

Refer to description on J16 in Table 4 “TWR-K20D72M Jumper Table” for more information.

2.6 Infrared Port

An infrared transmit and receive interface is implemented as shown in Figure 4 below. The CMT_IRO

pin directly drives an infrared diode. The receiver uses an infrared phototransistor connected to an on-

chip analog comparator through a low-pass filter.

Figure 4: Infrared Port Implementation

2.7 External Bus Interface – FlexBus

The K20 device features a multi-function external bus interface called the FlexBus interface controller,

capable of interfacing to slave-only devices. The FlexBus interface is not used directly on the TWR-

K20D72M.Instead, a subset of the FlexBus is connected to the Primary Connector so that the external

bus can access devices on Tower peripheral modules. Refer to Table 6 “TWR-K20D72M Primary

Connector Pinout“and sheet 8 of the TWR-K20D72M schematics for more details.

2.8 Accelerometer

An MMA8451Q digital accelerometer is connected to the K20 MCU through an I2C interface and a

GPIO/IRQ signal. Refer to Table 5 “I/O Connectors and Pin Usage Table” for connection details.

2.9 Potentiometer, Pushbuttons, LEDs

The TWR-K20D72M features two pushbutton switches connected to GPIO/interrupt signals, one

pushbutton connected to the master reset signal, two capacitive touch pad electrodes, four user-

TWR-K20D72M User’s Manual Page 10 of 17

controllable LEDs, and a potentiometer connected to an ADC input signal. Refer to Table 5 “I/O

Connectors and Pin Usage Table” for information about which port pins is connected to these features.

2.10 General Purpose Tower Plug-in (TWRPI) Socket

The TWR-K20D72M features a socket that can accept a variety of different Tower Plug-in modules

featuring sensors, RF transceivers, and more. The General Purpose TWRPI socket provides access to

I2C, SPI, IRQs, GPIOs, timers, analog conversion signals, TWRPI ID signals, reset, and voltage supplies.

The pinout for the TWRPI Socket is defined in Table 2.

Table 2. TWRPI Socket Pin Description

Left-side 2x10 Connector Right-side 2x10 Connector

Pin Description

1 5V VCC

2 3.3 V VCC

3 GND

4 3.3V VDDA

5 VSS (Analog GND)

6 VSS (Analog GND)

7 VSS (Analog GND)

ADC: Analog 0

9 ADC: Analog 1

10 VSS (Analog GND)

11 VSS (Analog GND)

12 ADC: Analog 2

13 VSS (Analog GND)

14 VSS (Analog GND)

15 GND

16 GND

17 ADC: TWRPI ID 0

18 ADC: TWRPI ID 1

19 GND

20 Reset

Pin Description

1 GND

2 GND

3 I2C: SCL

4 I2C: SDA

5 GND

6 GND

7 GND

GND

9 SPI: MISO

10 SPI: MOSI

11 SPI: SS

12 SPI: CLK

13 GND

14 GND

15 GPIO: GPIO0/IRQ

16 GPIO: GPIO1/IRQ

17 GPIO: GPIO2/UART0_RX

18 GPIO: GPIO3/ UART0_TX

19 GPIO: GPIO4/ UART0_CTS

20 GPIO: GPIO5/ UART0_RTS

2.11 Touch Interface

The touch sensing input (TSI) module of the Kinetis MCUs provides capacitive touch sensing detection

with high sensitivity and enhanced robustness. Each TSI pin implements the capacitive measurement

of an electrode.

The TWR-K20D72M provides two methods for evaluating the TSI module. There are two individual

electrodes on-board the TWR-K20D72M that simulates pushbuttons. Additionally, twelve TSI signals

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