NXP Semiconductors FRDM-K20D50M User Manual

FRDM-K20D50M User’s Manual

FRDM-K20D50M-UM

Rev. 1.2

Freescale Semiconductor Inc.

Microcontroller Solutions Group

Table of Contents

1 FRDM-K20D50M Overview .................................................................................................................. 3

2 References documents .......................................................................................................................... 4

3 Getting started .......................................................................................................................................... 4

4 FRDM-K20D50M Hardware Overview ............................................................................................. 4

5 FRDM-K20D50M Hardware Description ......................................................................................... 7

5.1.1 Power Supply ....................................................................................................................................................................................... 7

5.1.2 Serial and Debug Adapter (OpenSDA) ...................................................................................................................................... 9

5.1.3 Clock source ....................................................................................................................................................................................... 12

5.1.4 USB Interface ..................................................................................................................................................................................... 13

5.1.5 Serial Port ........................................................................................................................................................................................... 13

5.1.6 Reset ...................................................................................................................................................................................................... 13

5.1.7 Debug .................................................................................................................................................................................................... 13

5.1.8 Capacitive Touch Slider ................................................................................................................................................................ 13

5.1.9 3-axis Accelerometer ..................................................................................................................................................................... 13

5.1.10 RGB LED ............................................................................................................................................................................................ 14

5.1.11 Visible light sensor ....................................................................................................................................................................... 15

5.1.1 Temperature sensor ..................................................................................................................................................................... 15

5.1.2 Input/Output Connectors ............................................................................................................................................................ 16

5.1.3 Arduino Compatibility .................................................................................................................................................................. 17

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1 FRDM-K20D50M Overview

The Freescale Freedom development platform is a set of software and hardware tools for evaluation and
development. It is ideal for rapid prototyping of microcontroller-based applications. The Freescale Freedom
K20D50M hardware, FRDM-K20D50M, is a simple, yet sophisticated design featuring a Kinetis K series
microcontroller, The K family microcontroller built on the ARM® Cortex™-M4 core with DSP capabilities.
FRDM-K20D50M features a K20DX128VLH5, this device boasting a max operating frequency of 50MHz, 128KB of
flash, a full-speed USB controller, and loads of analog and digital peripherals. The FRDM-K20D50M hardware is
form-factor compatible with the Arduino™ R3 pin layout, providing a broad range of expansion board options.
The on-board interfaces include an RGB LED, a 3-axis digital accelerometer, and a capacitive touch slider, and
ambient light sensor.
The FRDM-K20D50M features 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.

Figure 1 Freescale FRDM-K20D50M Overview

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Filename

Description

FRDM-K20D50M Quick Start
Package

Quick Start Guide and supporting files for getting started with
the FRDM-K20D50M.

FRDM-K20D50M User’s Manual

This document—overview and detailed information for the

FRDM-K20D50M hardware.

FRDM-K20D50M Pinouts

Spreadsheet of pin connections for all MCU pins. Includes
pinout for the I/O headers, Arduino R3 compatibility chart,
and OpenSDA MCU pinout.

FRDM-K20D50M Schematics

PDF schematics for the FRDM-K20D50M hardware

FRDM-K20D50M Design Package

Zip file containing all design source files for the FRDM-
K20D50M hardware

OpenSDA User’s Guide

Overview and instructions for use of the OpenSDA embedded

2 References documents

The table below provides a list of reference documents for the FRDM-K20D50M hardware. All of these
documents are available online at www.freescale.com/ FRDM-K20D50M.
Table 1. FRDM-K20D50M Reference Documents

3 Getting started

Refer to the FRDM-K20D50M Quick Start Package for step-by-step instructions for getting started with the
FRDM-K20D50M. See the Jump Start Your Design section onwww.freescale.com/FRDM-K20D50M for the Quick

Start Package and software lab guides.

4 FRDM-K20D50M Hardware Overview

 Arduino R3 compatibility
 MK20DX128VLH5 MCU (50 MHz, 128KB Flash, 16 KB RAM, 32 KB FlexNVM, Low power, 64LQFP package

 Dual role USB interface with mini-B USB connector
 Open SDA

 Capacitive touch slider
 Ambient light sensor
 MMA8451Q accelerometer
 Tri-color (RGB) LED
 Flexible power supply options – USB, coin cell battery, external source
 Battery-ready, power-measurement access points
 Easy access to MCU I/O via Arduino ™ R3 compatible I/O connectors

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 Programmable OpenSDA debug interface with multiple applications available including:

o Mass storage device flash programming interface
o P&E Debug interface provides run-control debugging and compatibility with IDE tools
o CMSIS-DAP interface: new ARM standard for embedded debug interface
o Data logging application



Figure 1 shows a block diagram of the FRDM-K20D50M design. The primary components and their
placement on the hardware assembly are pointed out in Figure 2.

Figure 1. FRDM-K20D50M block diagram

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J19 I/O Header

J2 I/O Header

J10

J9
K20D50M

Capacitive
Touch Slider

RGB LED

Light Sensor

Reset

OpenSDA

K20D50M USB

Accelerometer
MMA8451Q

Figure 2. FRDM-K20D50M main components placement.

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