TPS65381A-Q1: During Sleep to wake-up event VSOUT1 supply latching to 2.5V, instead of 0V and not recovering on wake-up event other than power reset.

Aakash Verma

Prodigy 10 points

Part Number: TPS65381A-Q1

Tool/software:

The step following to go to sleep as follow:

----- Turning OFF VDD5 (To make sure CAN sleep) > Going to STBY mode by writing 7D (WR_CAN_STBY)

A) Wake up sequence

Power on Reset:

- Enabling ALL supply by sending PM_CMD_EN_ALL command (0x7B15u) > PM_EnableVDD_SEN_5V()

IGN or CAN Wakeup:

PM_EnableVDD5() >PM_EnableVDD_SEN_5V()

PROBLEM Statement - VSOUT1 supply latching to 2.5V, instead of 0V and not recovering on wake-up event other than power reset

Please suggest appropriate solution:

Circuit -

3 months ago

0 Michael Hernandez 3 months ago

TI__Expert 4950 points

Hi Aakash,

It looks like you currently have the pin configured in a tracking configuration. How does the voltage on VDD5 behave during when having this issue?

Best,

Michael Hernandez

0 Aakash Verma 3 months ago in reply to Michael Hernandez

Prodigy 10 points

This capture was taken after I disabled the 5V VDD (with an approximate delay of 350 ms), then re-enabled it for about 3.5 ms just before sending the 7D command.

0 Michael Hernandez 2 months ago in reply to Aakash Verma

TI__Expert 4950 points

Hi Akash,

Is there anything connected to VSOUT1? I'm wondering if there is something else supplying power or connected to a different GND on this pin.

Best,

Michael Hernandez

Power management

Power management forum

TPS65381A-Q1: During Sleep to wake-up event VSOUT1 supply latching to 2.5V, instead of 0V and not recovering on wake-up event other than power reset.