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TPS68470 GPIO voltage level

Antony Lin
Genius 13480 points
Other Parts Discussed in Thread: TPS68470

Hi,

 

Customer is using TPS68470/GPIO5 as camera reset signal.  The voltage level of this signal is 1.2V.  I didn’t see any external pull-up on this signal, and assume it should be configured as a push-pull signal.  But I don’t know why it’s 1.2V.  I found they add a pull-down resistor (R4620=100kohm) to GND on this signal, is this related to the 1.2V voltage level?  Do they need to add this pull-down resistor?  WHat shpuld be the expected voltage level here

 

Thanks!

 

Antony

  • 0
    TI__Genius 10885 points
    Hi Antony,

    This really depends on how they have GPCTL5A configured. In the datasheet you can see the default reset values of the GPCTL5A (GPIO5)register is an input with an internal pull-up, set to LDO_IO domain. If they have not adjusted this register and are using the 100kΩ external pull-down, then they have a resistive divider incorporating the 50kΩ pull-up to the 1.8V source, which results in 1.2V.