Module Sourced Accessory Power

The +VDD1 and +VDD3 power rails rise during cold boot of the module PMIC, so both rails are stable before the SoC is taken out of the reset and before code execution starts. They are intended to activate voltage regulators on the expansion board so system devices can be available when the module code execution begins.

Both the +VDD1 and +VDD3 rails can be used directly for powering system components or enabling voltage regulators and supplies on the expansion board if the maximum current limits in the table below are not exceeded.

If the power consumption of external peripherals is not known, do not use the +VDD1 and +VDD3 power rails directly.

 

Voltage Rail Name

Nominal Voltage

Maximum Current

Module Pin

Description

+VDD3

3.3 VDC

300 mA

J2.30

+3.3 V power supply sourced from the module and derived from the +VSYS supply to the module.

Do not exceed maximum current specified.

+VDD1

1.8 VDC

300 mA

J2.36

+1.8 V power supply sourced from the module and derived from the +VSYS supply to the module.

Do not exceed maximum current specified.

For more complete information about compiler optimizations, see our Optimization Notice.