cy8c9560a I2C address conflict

[Abp_4615021]

Hello Cypress team,

we have connected four cy8c9560a io expander with i2c 7 bit address of 0x20,0x21,0x22 and 0x23 respectively

But ICs are responding with only address 0x20 and 0x21. currently two ICs responding with 0x20 and other two with 0x21

We have connected A1 directly to VCC or GND and A0 connected to VCC or GND through 100k resistor

0x22 and 0x23 address is not working

Please help us to solve this issue

Any register configuration is required for changing mode of A1 pin.

[SampathS_11 · Accepted solution]

Hello,

Connect A1 to VCC or GND through a 330Ω resistor, instead of connecting them directly to VCC or GND. There is no register configuration for addressing. Since an address is required to access a register, the specific address is determined at power on reset by means of Extendable Soft Addressing, described in detail on page 9 of the datasheet.

Best regards,

Sampath