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Evolved Microcontroller Application Board

Introduction

EMAB will be a microcontroller development board based on an Atmel AVR XMEGA processor. It will include USB-based communication, USB or external DC power, and I/O connectors for extension boards.

Components

Processor

AVR XMEGA A4U series, 44 TQFP package.

USB Interface

FTDI FT230X serial bridge for communication with application code and programming through serial bootloader.

Extension Connectors

Extension slots contain a 16-pin IO connector and 6-pin power connector. Standard form factor EMAB will have two slots, micro-EMAB will have one. Extender boards will connect to either one or two slots (two-slot boards not compatible with micro).

Slots A and B will both include 6 PWM outputs, 1 I2C, 1 UART, 4 ADC inputs. Slot A will have an additional UART and SPI. Slot B will have 2 additional ADC/DAC pins.

A third connector (for direct cable connection, not extension boards) will include additional signals and duplicates of some from A or B.

Pinouts

Main extension connectors

Pin A Alternate B Alternate
1 GND   GND  
2 3.3V   3.3V  
3 A0 ADC A4 ADC
4 A1 ADC A5 ADC
5 A2 ADC, Async B2 ADC, DAC, Async
6 A3 ADC B3 ADC, DAC
7 C0 PWM, SDA E0 PWM, SDA
8 C1 PWM, SCL E1 PWM, SCL
9 C2 PWM, RX E2 PWM, RX
10 C3 PWM, TX E3 PWM, TX
11 C4 PWM, SS D0 PWM
12 C5 PWM, MOSI D1 PWM
13 C6 RX, MISO A6 ADC
14 C7 TX, SCK A7 ADC
15 GND   GND  
16 GND   GND  

UEXT

1 3.3V  
2 GND  
3 C3 TX
4 C2 RX
5 C1 SCL
6 C0 SDA
7 C6 MISO
8 C5 MOSI
9 C7 SCK
10 C4 SS

Analog input

XMEGA A/D converters require a reference voltage up to Vcc-0.6V. Reference voltage onboard will be switchable between a low-current LDO and precision shunt reference (up to 2.5V). Analog reference signal will be available on extension power connector to be used (or supplied) by extension boards.

Family Planning

Planned board family members:

Size Name Dimensions (inch) MCU Package Usable MCU Parts USB Power Extension Slots UEXT Headers Analog reference
Standard/Full 3.4x1.8 44-TQFP A4(U), C4, D4 FT230X USB/DC jack, LDO 2 1 2.5V LDO, 2.048V shunt
Micro 2.1x1.8 44-TQFP A4(U), C4, D4 FT230X USB/DC jack, LDO 1 1 2.5V LDO, 2.048V shunt
Extra 3.1x2.5 64-TQFP A3(U) FT230X, XMEGA? USB/DC jack, SMPS 3 2 2.5V LDO, 2.048V shunt
Nano 1.8x1.2 32-TQFP E5 None Header, LDO 1 1 2.5V LDO

-- StephenCavilia - 28 May 2014
Topic revision: r5 - 03 Jul 2014, StephenCavilia
 

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