Important Notes for DeepSleep For MitySOM-AM62¶

This page includes some notes regarding DeepSleep mode for the MitySOM-AM62 family.

Full deep sleep functionality is still being evaluated on the MitySOM-AM62A platform. Please contact Critical Link for more details.

Reference TI's docs on low power modes: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/latest/exports/docs/linux/Foundational_Components/Power_Management/pm_low_power_modes.html

PMIC Adjustment¶

For DeepSleep mode on the MitySOM-AM62x, one of the PMIC registers on the SOM must be updated in order to allow the Buck regulators to enter Pseudo Frequency Modulation (PFM) mode. This is necessary to get the lowest power consumption while sleeping. The command to adjust the PMIC is shown below.

i2cset -f -y 0 0x30 0x20 0xdd

A similar change is needed on the MitySOM-AM62P:

i2cset -y -f 0 0x48 0x4 0x31
i2cset -y -f 0 0x48 0x8 0x31
i2cset -y -f 0 0x48 0xa 0x31

Note that these PMIC settings have had limited validation. Critical Link is working on fully validating these settings and incorporating them into the reference SDK designs, but as of SDK 11 they are not included / set by default.

USB HUB wakeup source on DevKit¶

In addition, for the current release of the DevKit, the USB port that is connected to the HUB (USB1) must be disabled in order to enter and remain in sleep mode. Currently there are pullup/pulldown resistors on the DevKit on the USB hub interface that must be removed in order to clear this issue (R6, R140, and R143). A note and errate for this issue will be published when final details are available. Please contact critical link for more details.