Post Go back to editing

Change address of AD7415 after power-up / dynamic I²C address

Category: Hardware
Product Number: AD7415

The AD7415 can have 3 different I²C addresses depending of state of AS pin (unconnected, GND, VCC)

Can I change state of AS pin and I²C address after device has powered-up?

I´d like to have many AD7415 on the same I²C line, and use multiplexer (74LS138), so that only one AD7415 has AS pin LOW, while all the others would have AS pin HIGH, and then use address 0x4A (AS pin LOW)

Unfortunately there is no answer in this thread:

 https://ez.analog.com/temperature_sensors/f/q-a/77381/how-can-ad7415-device-transients-think-it-is-a-wrong-i2c-address 

Thank you

Top Replies

  • HI  ,


    We wouldn't recommend doing this, as the part wasn't designed to operate this way. Trying this configuration could work, but there is no guarantee. 

    I'd also like to add that although…

Parents
  • HI  ,


    We wouldn't recommend doing this, as the part wasn't designed to operate this way. Trying this configuration could work, but there is no guarantee. 

    I'd also like to add that although you can only have 3 different I2C addresses for the same device, there are two types(AD7415-0 and AD7415-1) of devices that are specifically made for you to have a total of 6 (two devices x 3 possible address pin configuration) I2C configurable addresses for the AD7415. Please see Table 4 of the datasheet for more details.

    Regards,
    Karlo

Reply
  • HI  ,


    We wouldn't recommend doing this, as the part wasn't designed to operate this way. Trying this configuration could work, but there is no guarantee. 

    I'd also like to add that although you can only have 3 different I2C addresses for the same device, there are two types(AD7415-0 and AD7415-1) of devices that are specifically made for you to have a total of 6 (two devices x 3 possible address pin configuration) I2C configurable addresses for the AD7415. Please see Table 4 of the datasheet for more details.

    Regards,
    Karlo

Children
No Data