Hi everyone,
I'm developing a carrier card for Trenz SOM TE0724. This SOM has a power management IC (DA9062) that controls the power-on sequencing and provides different on-board voltages. I would like to use the outputs of VLDO2 (1.8A/300mA) and VLDO34 (2.5V/600mA) to have a joint 1.8V/900mA power source. As the output voltage of these LDOs can be programmed via I2C, it shouldn't be a problem as log as I can delay the VLDO34 power-up until after the internal registers have been reconfigured. So I need to:
power-up Bucks, LDO1 and LDO2 in PMIC -> reconfigure VLDO34 voltage via I2C -> power-up VLDO34 as a 1.8V source
Is this possible?
According to DA9062 datasheet, it should be possible to use inputs PWR_GPIO2 and PWR_GPIO4 to change the power-up sequencing in DA9062 but I'm having the same results whether I set these inputs as '0' or '1': all output voltages are powered-up according to the sequence shown in TE0724 TRM, so VLDO34 is 2.5V before I can reconfigure it to be 1.8V. These tests were performed using Trenz carrier TEB0724. I would appreciate your help on this.
