IWR1443BOOST: PULL UP/PULL down resistors on PMIC question?

feng tang

Part Number: IWR1443BOOST

From the specification of lp87524b/j, the pull up resistor for PGood, GPIO1, GPIO2, GPIO3 should be 10K ohms, why the EVM board use 4.99K ohms, Can we change to 10k ohms? The PMIC_NRST should use pull down resistors, why use pull up resistor, can we use pull down resistor for this?

Thanks,

over 6 years ago

0 Charles Oladimeji over 6 years ago

TI__Mastermind 33805 points

Hi,

Can you please add a reference to the specification? I was not able to find a reference to this in the datasheet.However the recommendation is to follow the EVM since that has been tested.
Lastly changing NRST to a pull down will keep the PMIC in reset, is that the objective?

Regards,
Charles O

0 feng tang over 6 years ago in reply to Charles Oladimeji

Genius 3595 points

please see the lp87524b/j page 9 for the pull up and pull down resistor values.lp87524b-q1.pdf

0 Charles Oladimeji over 6 years ago in reply to feng tang

TI__Mastermind 33805 points

You will need to test the board to confirm, but it should be okay.
The NRST however needs to be at a logic high for the PMIC to operate.

Regards,
Charles O

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IWR1443BOOST: PULL UP/PULL down resistors on PMIC question?