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Relay board - I2C frequency

Posted: Fri Sep 18, 2015 12:30 am
by smanning_123
Whats the I2C frequency of the 8 channel relay board (shield)...

Re: Relay board - I2C frequency

Posted: Fri Sep 18, 2015 5:39 am
by andrew
The RELAY8 uses an MCP23017:
http://ww1.microchip.com/downloads/en/D ... 21952b.pdf
... whose I2C bus can operate at 100 kHz, 400 kHz and theoretically 1.7 MHz.