PCA9515A: PCA9515A

user4961418

Part Number: PCA9515A

0 user4961418 1 month ago

Hello. In the circuit below, if the sensor is turned off along with the power,

BRANCH1 has other circuits.BRANCH1 is communicating via I2C.

Is there anything wrong with BRANCH1?

0 Jack Guan 1 month ago

Hi,

The team is currently on leave due to US holidays. We will get back to you shortly.
Thanks,

0 Tyler Townsend 1 month ago in reply to user4961418

Hi User4961418,

If POWER = 0V, and the sensor is off, SCL0 and SDA0 will pull LOW towards GND.

If VCC = 3.3V, the PCA9515APW will see this as a logic low, and propagate a low condition to the MCU master.

In order to ensure high-z, consider VCC = 0V, or pulling the EN pin = GND.

Regards,

Tyler

Interface forum