TPS6594EVM: TPS6594EVM-POWER QUESTION

Hello Rocky,

rocky rocky said:

1: when PMIC is working, all LDO and BUCK output normally, if I am using IIC of MCU to communicate with TPS6594, all LDO, BUCK will not output in this time? my EVM doesn't output when I am programming with GUI.

Can you list out your steps on this, so I can recreate this? Was this before after enable, your custom programming?

rocky rocky said:

2: TPS6594 - VCCA(4 pin) still connects external 3.3V, but TPS6594 - VIO-IN(48 pin) power is from VOUT-LDO1(13 pin), when I turn off LDO1, then I can't connect TPS6594 later? because PMIC IO is 0V now, IIC can't communicate with MCU. 

Did you tie the LDO1 pin through the test point of VIO-IN?

rocky rocky said:

3: can I set register value for power down and power up sequence about LDO and BUCK output,  depend on my requirement when the VCCA turn off? if we can do this, we need not communicate with PMIC when PMIC on working, only need to program one time, and when PMIC power down and power up, all output power down and power up sequence will according to my requirement.

The power sequences and their trigger transitions can not be setup during runtime this can only be done through an NVM change.

If I'm understanding your question correctly, you're looking to setup power sequences when VCCA is applied(and good) and when it turns off?

BR,

Nicholas

Hi, Nicholas:

1: you can test the LDO1,2,3,4, on programming EVM by GUI. after click "Program Device", until program successfully. please see my picture.

2: yes, if VIO_IN connected LDO1 when LDO1=0.6V, PMIC can't connected with MCU

3: yes, you are right, I want to set LDO and BUCK power down sequence when VCCA is 0V, PMIC not work.

because when I turn off all power, LDO and BUCK power down sequence is synchronized. but my design has power down sequence requirement for LDO and BUCK. I want to edit .json file, set some register value, can achieve my requirement?

if all power off(include VCCA=0V), LDO and BUCK power down must be synchronized, can I set LDO and BUCK power down sequence in the VCCA is 3.3V? I can connect VCCA with external 3.3V, never power off for 3.3V. Keep MCU connecting with PMIC. change some register value.

thanks so much!