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TPS23880: manually enable port

Di Wang
Expert 1740 points
Part Number: TPS23880

Hi,

Two short questions,

1. which register can enable/open the PSE port (force open) without a PD presents?

2. Which register can read the input PSE voltage(generally 48V)?

Thanks.

  • 0
    TI__Genius 15685 points

    Hi Di,

    Please see my answers below.

    1. which register can enable/open the PSE port (force open) without a PD presents?

    [Answer]Without connecting a PD, you can turn on the port through register 0x19 with the port being configured in manual mode. And you will also need to disable DC disconnect in register 0x13(the default is disabled).

    2. Which register can read the input PSE voltage(generally 48V)?

    [Answer]You can read input voltage from registers 0x2E and 0x2F. You can also read each port's current voltage from registers  from 0x30 to 0x3F.

    Before you configure the device, you will need to load SRAM code to TPS23880. Please download SRAM code from TPS23880 product folder and follow the steps in this tech note: www.ti.com/.../slvae12a.pdf

    Best regard,

    Penny