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PMIC_ON_REQ design on i.MX7 SABRE.

Question asked by Satoshi Shimoda on Oct 19, 2016
Latest reply on Oct 25, 2016 by Satoshi Shimoda

Hi community,


Our customer have a question about i.MX7 SABRE board.
Please see the following image, it shows the connection of PMIC_ON_REQ signal.

PMIC_ON_REQ is push-pull output from Table 8 in IMX7DSHDG Rev.0, and RESET_B of reset IC is open-drain from TPS3808 datasheet.
If i.MX7 output PMIC_ON_REQ as High and reset IC output output RESET_B as low at the same time, we think output collision will be occurred and short will be also occurred as the red route on the following image.

So pull-down resistor should be added between PMCI_ON_REQ and RESET_B (at the black square).
Is our understanding correct?
Or the SABRE shematic is no problem with some reason?

Best Regards,
Satoshi Shimoda