ADP5587 SPEC. Question

Dear Sir:

ADP5587 can be used for push-pull architecture? Another AD5587  GPIO(R0~R7,C0~C7) ,If useing Open-drain or push-pull mode in system design. Each GPIO can accept the sink current is how much?

Best Regards,

Jacky

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    •  Analog Employees 
    on May 7, 2013 10:22 PM

    Hello Jacky,

    The ADP5587 has pull-ups enabled by default on start-up. The maximum recommended sink current is 1mA per pin.

    Other chips to consider are the ADP5585, ADP5586, and the ADP5589. These are able to source up to 5 mA and sink up to 10 mA per pin. Additionally, there are options that allow for different start-up conditions (pull-up and pull-down configurations).

    I would recommend using the ADP5589-00 in a similar configuration to your suggestion, but with the voltage on the anode side of the LEDs at VCC of the IC. You could achieve up to 19 individually controllable indicator LEDs with up to 10 mA current each in this manner. You will still need ballasting resistors as you have shown.

    As long as the top rail of the LED voltages is the same as the ADP558x chip, this design could be a method to provide multiple indicator LEDs while only using a single I2C connection to a microprocessor.

    Ryan

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  • 0
    •  Analog Employees 
    on May 7, 2013 10:22 PM

    Hello Jacky,

    The ADP5587 has pull-ups enabled by default on start-up. The maximum recommended sink current is 1mA per pin.

    Other chips to consider are the ADP5585, ADP5586, and the ADP5589. These are able to source up to 5 mA and sink up to 10 mA per pin. Additionally, there are options that allow for different start-up conditions (pull-up and pull-down configurations).

    I would recommend using the ADP5589-00 in a similar configuration to your suggestion, but with the voltage on the anode side of the LEDs at VCC of the IC. You could achieve up to 19 individually controllable indicator LEDs with up to 10 mA current each in this manner. You will still need ballasting resistors as you have shown.

    As long as the top rail of the LED voltages is the same as the ADP558x chip, this design could be a method to provide multiple indicator LEDs while only using a single I2C connection to a microprocessor.

    Ryan

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