No I2C response from PMIC2 on custom imx8qm-mek

[sig0912]

Hi NXP,

We have developed a custom iMX8QM-MEK based board.

Our board uses:

PMIC 1: PF8200ESES

PMIC 2: PF8200DBES

The schematic is copied from iMX8QM-MEK. VDDOTP & TBBEN both pulled to ground through external pull-down.

Both PMICs are booting and providing the correct voltages according to the OTP configuration.

From the datasheet PMIC1 is on slave address 0x08 and PMIC2 is on slave address 0x09. But the PMIC2 doesn't answer at all to any read/write commands.

We are using scfw version 1.9.0. Should we change anything in the scfw source code in order to talk to the PMIC2?

Hope we can hear from you soon, thank you very much for your help.

[Juan-Rodarte · Accepted solution]

Hi Ingrid

You can try pmic apis described in sect.12.20.3.1 dynamic_pmic_set_voltage() System Controller Firmware Porting Guide (sc_fw_port.pdf) included in SCFW Porting Kit

If it doesn't work, it may be hardware problem.

Best regards

[sig0912]

Hi @Juan-Rodarte,

Thank you for response, it was a hardware issue, the pmic was indeed not powered properly

Best Regards