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ADS1115: About internal resistance or ADDR pin

Tsukui Yusuke
Guru 21930 points
Part Number: ADS1115

Hi,

Could you tell me about ADDR pin?
Are pull-up and pull-down resistors installed inside the ADDR pin?

Customer will pull down this pin and set the address.
For that reason,Customers want to know the need for pull down resistors.

Best Regards,
Yusuke/Japan Disty

  • 0
    TI__Prodigy 330 points
    Dear Tsukui,

    For the setting of the address you don't need a pull down resistor. Connecting pin ADDR to GND, VDD, SDA, or SCL, allowing for four different addresses to be selected with one pin.

    I would recommend your customer to read the section 9.5.1.1 "I2C Address Selection" from the datasheet ADS1115 to get more information.

    Best regards,
    Florian
  • 0 in reply to Florian Luetkebohle
    Guru 21930 points

    Florian-san,

    Thank you for your support.
    I've contacted the contents of which are described in the data sheet ("I2C Address Selection") to the customer.
    However,Customers are considering setting pull-down resistor (47k) just in case.

    Is it no problem to install pull-down resistor?
    Are pull-up and pull-down resistors installed inside the ADDR pin?

    Could you give me your advice?

    Best Regards,
    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Guru* 98025 points
    Tsukui-san,


    I've checked with the designer and the input for the ADDR pin has no pull-up or pull-down resistance. It is similar to a digital input pin, connected to the high-impedance gate of a CMOS input device.

    If your customer is attaching ADDR to GND, adding a pull-down resistor should not affect address decoding.


    Joseph Wu