PCA9541 10-bit address problem

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PCA9541 10-bit address problem

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yaotienhuang
Contributor II

From PCA9541 spec, the device address can be 0x78 to 0x7C.

However 0x78 to 0x7C are reserved for 10-bit addressing.

So the device address will expand to 0b11110xx 0b1111xxx .

Am I correct?

Thanks.

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guoweisun
NXP TechSupport
NXP TechSupport

Hi

From PCA9541 spec, the device address can be 0x70 to 0x7F,but from 0x78 to 0x7F is as Reserved I2C-bus addresses must be used with caution.

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yaotienhuang
Contributor II

Hi G.w,

If my device address is 0x78, does the address will expand to two byte address? Or still one byte address?

i2c-tools only support to 0x77.

Thanks.

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guoweisun
NXP TechSupport
NXP TechSupport

I don't know why your IIC tool only support 0x77 maximum,but this should be still one byte address.

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