Hello Sitara,
If I have multiple devices, including an AM3352, sharing an I2C bus, would the AM3352's I2C pins have any interfering impact on the operation of other I2C devices if the AM3352 is powered down?
To clarify, one of the devices on the I2C bus powered up for lab or manufacturing programming whilst the rest of the parts on the I2C bus are powered down. The intent is that none of the other parts on the I2C bus that are powered down will interfere with the operation of the singled out I2C device. One of the devices that is on the I2C bus to be powered down in this situation is the AM3352 (both core and IO power would be off). Do any characteristics of the AM3352 (such as ESD protection diodes) cause it to interfere with I2C operations of other devices while the AM3352 is powered down? The specific pins in question are C17 for SDA and C16 for SCL on the BGA324 package.
According to the AM3352’s Technical Reference Manual (section 21.3), the I2C is an open-drain output buffer, and is at high impedance in the reset state. Though not directly addressing the powered-down state, I assume the open-drain configuration indicates that as long as the I2C pins are pulled idle-high on the bus, the AM3352 will ideally have no impact on other devices in the powered-down state.
