Customer want to use LSF0204 for SPI 1.8V <> 3.3V. (I know we have TXU/TXB but let's focus on LSF0204 first cause the design was fixed)
They are not yet connect SPI wire on the EVM. Here is the setup:
1. provide dc supply 1.8V on A1, but still see 1.8V on B1
2. provide dc supply 1.8V on A2, .but still see 1.8V on B2
The test didn't have pullup resistors cause we thought SPI is push pull interface.
Here is the schematic. The pullup resistors are just reserved but not mounted.
Could you please clarify if LSF0204 support SPI and what's the proper way to make it work?