Two wire serial interfaces are included in following AVR microcontroller families: ATmega8x, ATmega16x, ATmega163x, ATmega32x, ATmega323x, ATmega64x, and ATmega128x. TWI interface is a “Philips” standard I2C. Using TWI interface you can connect up to 128 devices using only two wires: clock (SCL) and data (SDA). Only two pull-up resistors on each line are needed this interface to work properly.

I2C interface circuit is open collector. This means if one of all devices has low level signal on a line, then it is “0”, and if all devices have high impedance state, then signal is considered to be high “1”. More details about TWI interface you can find on any ATmega datasheet.

One of my examples Interfacing AD7416 digital temperature sensor you can find here: Analog Devices Digital temperature sensor AD7416

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This entry was posted on Saturday, May 13th, 2006 at 6:16 pm and is filed under AVR Microcontrollers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.