AM62L: AM62L32

yang liu61

Part Number: AM62L

Tool/software:

The design uses AM62L32 + LPDDR4 + eMMC. The PMIC is a PTPS6521401VAFR (which we received).

However, after the board is powered on, the PMIC's IO that controls the 3.3V load switch does not enable the EN (enable) pin of the load switch.

The waveform is as follows:

Could you help analyze what might be causing this issue?

0 Varun C 2 days ago

Hi,

Could you please confirm whether you are using Linux or MCU+,RTOS, Bare Metal domain ?

0 yang liu61 2 days ago in reply to Varun C

linux

0 Anshu Madwesh 1 day ago in reply to yang liu61

Hello,

Let me re-assign to the PMIC team to comment.

Thanks,

Anshu

0 Sarah Lao 1 day ago

Hi Yang,

GPIO should be the first output of the PMIC timing sequence, are you seeing the other PMIC outputs powering on successfully (B2 or LDO2) ?

Are you able to use I2C to read the interrupt registers of the PMIC to see if any fault is being flagged?

Best Regards,
Sarah

0 yang liu61 21 hours ago in reply to Sarah Lao

Hi Sarah，

The output of BUCK2 was not successfully established； LDO1 is OK； LDO2 no test；

The test images are as follows

0 Sarah Lao 2 hours ago in reply to yang liu61

Hi Yang,

I may need more information to help identify the issue here.

Are you able to send full schematic for proper review?
Is it possible to know how much capacitance is on Buck2, including at the point of load?

Also, are you able to use I2C to read the interrupt registers of the PMIC to see if any fault is being flagged?

Best Regards,
Sarah

Processors forum