PGA411-Q1: Booster circuit and SPI Communication not working

Hi Abhinav,

The boost will not turn on if there is a fault condition. Is a fault condition being reported?

You can check that the boost circuit is capable of running by holding FAULTRES low to force the PGA411 to operate even if a fault condition is present. This is a great debugging tool; however, please note that if a high current fault is present (for instance a short circuit on the exciter amplifier output or the boost), then it is possible to damage the device when holding FAULTRES low.

Julio

Hello Julio,

Thanks for your reply.

The voltage at FAULT pin is observed to be 0.038V and I have already checked the boost circuit by forcing the FALUTRES pin low. The boost circuit did not work in that case too.

I also verified the logic of SPI read commands by configuring alternate SPI pins of the MCU to use externally with PGA411-Q1EVM board. It is working fine while I read the registers of the EVM board, but the same SPI read on the on-board PGA411-Q1 returns 0x0000 for all registers.

Is there some something that I'm missing here? Is there something to be done initially inorder for the IC to work as expected?

Regards

Abhinav

Hi Abhinav,

I see thanks for confirming. What are you using for VCC and VDD power supplies? Do they ramp to 5V within 4ms?

Hello Julio,

For VCC, we have used 5V directly from the power supply through a filter. I'm attaching the picture of our schematic for your reference.

The voltage at the VCC pin is 5.15V.

From PGA411-Q1's datasheet, I see VDD is an output pin of the IC and the voltage is observed as 1.769V.

Regards

Abhinav

Hi Abhinav,

What about you VIO supply? What is your power bring up timing for VCC and VIO? VIO should never be supplied before VCC is stable