VIO pin of TPS65217CRSLR as this has the IO voltage of 1.8V while processor IO has the voltage level of 3.3V. Ex:I2C . Processor I2C0_SDA has 2V as VIH while PMIC VOH=VIO – 0.3=1.5V. which can create a issue?
we are using AM3358 processor.
Hi Arjuna,
Thanks for posting this question on E2E. If the VIO voltage on the TPS65217C PMIC is 1.8V, you can still have pull-up resistors on the I2C0 pins connected to 3.3V as long as the voltage on VDDSHV6 (on the AM335x processor) is 3.3V as well. VDDSHV6 is the supply voltage for the I/O domain of the I2C0. nINT, SCL and SDA (on the PMIC) should be pulled up to the same voltage that is connected to VDDSHV6. Table 4 (Pin Attributes) on the AM335x datasheet provides more details on the voltage supply associated with each signal on the processor. Please keep in mind there are some signals (like PWRONRSTn) that could have VDDSHV6 as the IO domain but the input voltage threshold is not a function of it. I'm also adding some captures and links below for your reference. Let me know if this answers your question. Thanks!
Link to TPS65217C reference design powering the AM335x processor:
From the AM335x datasheet:
From TPS65217 User Guide: Powering the AM335x with the TPS65217x . (Rev. I)
Thanks,
Brenda
