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Hi,
We are using UCD9081 in our board. Every time we connect the board to GUI it detects random I2C address. Two of the address pins are left floating. Is this causing the address to change randomly?
Regards
Madhura
Yes.
The UCD9081 selects an I2C address by sampling the logic level of the four digital inputs to the device (ADDR1–ADDR4) during the RESET interval. When the UCD9081 is released from RESET, the ADDRx logic levels are latched and the I2C address is assigned. External pullup/pulldown resistors are required to configure the I2C address; the UCD9081 does not have internal bias resistors.