TPS65217 sleep mode

desmond liu

Intellectual 565 points

Other Parts Discussed in Thread: AM3356, TPS65217

Hi TI,

We are using TI processor AM3356, and we use linux kernel and filesystem from TI,

am335x-evm-sdk-bin-07.00.00.00.tar.gz/board-support/linux-3.12.10-ti2013.12.01.tar.bz2

board-support-bin/filesystem/tisdk-rootfs-image-am335x-evm.tar.gz

We have some problem about how to make the processor and PMIC sleep?

If we use the following command to put the processor into sleep, but the PMIC voltage and current do not decrease.

root@(none):~# echo standby > /sys/power/state

[ 22.948249] PM: Syncing filesystems ... done.

[ 24.481667] Freezing user space processes ... (elapsed 0.001 seconds) done.

[ 24.489792] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.

[ 24.498334] Suspending console(s) (use no_console_suspend to debug)

If possible to use software to put pmic in sleep mode first and then issue the above command?

The PMIC we are using is TI tps65217c.

Thank you!

Best regards,

desmond

over 11 years ago

0 Jamie Maxwell over 11 years ago

Expert 1530 points

What is the status of the PWR_EN pin?

You MUST pull this pin low in HW to enter sleep state.

"To enter SLEEP state, set the OFF bit in the STATUS register to ‘0’ (default) and then pull the PWR_EN pin low. All power rails controlled by the power-down sequencer will be shut down and after 1s the device enters SLEEP state. If LDO1 was enabled in ACTIVE state, it will remain enabled in SLEEP state."

0 Gregory Watkins over 11 years ago in reply to Jamie Maxwell

TI__Expert 4005 points

Desmond,

As Jmax has pointed out, placing TPS65217 into sleep mode requires pulling the PWR_EN pin low. If you need help implementing this functionality please reach out to the appropriate Sitara/Linux forums.

0 desmond liu over 11 years ago in reply to Jamie Maxwell

Intellectual 565 points

Hi Jamie,

Thank you for your reply. I get the sequence of going to sleep mode, I will look at how to pull PWR_EN pin low.

Best regards,

desmond

0 desmond liu over 11 years ago in reply to Gregory Watkins

Intellectual 565 points

Hi Gregory,

Thank you for your reply. Do you know in which post I can find the way of implementing this functionality?

Best regards,

desmond

Power management

Power management forum

TPS65217 sleep mode