In order to measure the wrist pulse wave, using the chip max32664 mation bring algorithm, the main control chip with STM32f103, because of STM32f103 IO port output level is 3.3 V, max32664 IO port output is 1.8 V, so with a automatic two-way txs0108 level conversion chip, IIC communication set up now, but the stm32 to max32664 write command, some commands can write smoothly, some commands written in prompt command is not legal, it commands and manual is consistent, and command in the prompt system delay is not enough, someone used max32664 this chip or encountered similar problems?