Tool/software:
Hi,
a customer is needs to operate the I2C0 and I2C1 at higher speeds (>400kbps). But the system is configured already with the I/O domain VDDSHV0 set at 3.3V, and they are unable to lower it to 1.8V.
The TRM shows that speeds >400kbps is only enabled with 1.8V mode
12.1.3.1 I2C Overview
The WKUP_I2C0, MCU_I2C0, I2C0, and I2C1 controllers have dedicated I2C compliant open drain buffers and
support high speed mode (up to 3.4 Mbps in 1.8 V mode and up to 400 Kbps in 3.3 V mode).
Question: Is is possible to put a PU to 1.8V on the I2C pins (as VDDSHV0 is configured to 3.3V) and expect that the I/O buffer can operate such that the I2C can operate at e.g. 1Mbps speed? Or is there an inherent issue with the I/O buffer not correctly reaching the necessary high-level with 1.8V PU?
Thanks!
--Gunter
