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ADV7182A I2C address change on the fly? (ALSB)

Question asked by Peter.M on Mar 22, 2018
Latest reply on Apr 10, 2018 by PoornimaSubramani

Hi, I'm creating a design using 4x ADV7182A devices on a single I2C bus.  The ADV part only allows 2 unique addresses based on the state of the ALSB pin.  Can I toggle the ALSB pin on the device during operation to change its address on the fly?

 

My thinking is that I could toggle the ALSB pins like chip selects so I can talk to all 4 devices without using isolators.  I would configure one device at 0x40, and the other three at 0x42, then communicate to 0x40.

 

Is this possible?  If so, is there a minimum time delay between toggling the ALSB pin and talking to the ADV part?

 

Thanks,

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