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For both Ultra96-V1 and Ultra96-V2, the HS Connector has a total of 34 PL IOs as follows:
- 2 from Bank 26 with VCCO = 1.8V -- I assume this is not enough for what you need
- 32 from Bank 65/66 with VCCO = 1.2V
I think what you propose may work with the Ultra96-V1. Please let us know if reprogramming the TPS6508641 to 1.5V worked.
For those who have the same question with Ultra96-V2, I will add a bit more analysis. The Ultra96-V2 has a bit more flexibility given the Infineon PMICs allow more programmable voltage range, but a design decision to combine the 1.2V HP Bank rail and the 1.2V USB Hub rail complicates things.
Looking at the Bank 65/66 VCCO specifically for Ultra96-V2:
- VCCO_65 is tied to net +VCCO_HP
- VCCO_66 is tied internally to VCCO_65, so also +VCCO_HP
- +VCCO_HP is Channel B output of U11, PMIC IRPS5401, Addres = 0x13
- +VCCO_HP is programmed to operate at 1.2V and 2.0A
- Besides VCCO_65, what else is connected to +VCCO_HP?
- Pull-up for FAN_PWM control, which is also on Bank 65
- VDD12 on U16, Microchip USB5744 USB Controller Hub
- VDD12 Abs Max = 1.32V
Since the PMIC is a programmable device, you could use the Infineon tools and Dongle to reprogram 0x13 Channel B output voltage to 1.8V. However, that exceeds the USB5744 absolute max on VDD12. If you didn't care about the USB functionality on Ultra96-V2 and you had the means, you could remove the USB5744 and then reprogram U11 to do what you want.
It might be easier to switch to something that is a lot more versatile like the UltraZed-EG platform.