DEV-12887 datasheet(7/40 Pages) SPARKFUN

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There are three main components to the breakout board: a TPS62172 step-

down regulator (U2), the Electric Imp socket (U1), and the ATSHA204

authentication chip (U3).

Electric Imp Breakout Schematic. Click the image to get a larger picture, or

click here to view the schematic as a PDF.

Pinout

All of the imp’s GPIO pins are broken out to the 0.1"-spaced header, along

with a few related power pins:

• GND - Common pin for input voltage

• VIN - Input voltage supply fed into regulator

• PIN1 - imp pin 1 (UART

CTS, UART TX, I C SCL, SPI

SCLK, DAC, ADC, PWM)

• PIN2 - imp pin 2 (UART

RTS, UART RX, I C SDA, SPI

MISO, ADC, PWM)

• PIN5 - imp pin 5 (UART TX, SPI

SCLK, DAC, ADC, PWM)

• PIN7 - imp pin 7 (UART RX, SPI

MOSI, ADC, PWM)

• PIN8 - imp pin 8 (UART

TX, I C SCL, SPI

MOSI, ADC, PWM)

• PIN9 - imp pin 9 (UART

RX, I C SDA, SPI

MISO, ADC, PWM)

• CD - Card detect. This signal will connect to GND whenever a card is

inserted into the socket.

• 3V3 - 3.3V output from regulator

• GND - Common ground

ID Chip

There’s actually one more piece of hardware required of the impee: an ID

chip, which provides each impee with a unique identification code. This

means that every impee you encounter should include an Atmel ATSHA204

authentication chip. The imp automatically interfaces with this chip every

time it boots up, so it can identify which impee it’s plugged into. This

actually turns out to be pretty awesome, because the program that an imp

runs depends on what impee it’s plugged into. If you had two impees in

your house – say controlling an irrigation system and another controlling a

coffee machine – one, single imp would run two different programs

depending on which machine it was plugged into.

You shouldn’t ever have to fuss with the ID chip. In fact, you can forget we

ever said anything about the ATSHA204!

About the imp002 Breakout

The imp002 is a solder-down module version of the original imp card. We

have done the hard work of creating a breakout board for you. Now, you

just need one board instead of 2 to get started with the electric imp!

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