SLAAE76B march 2023 – june 2023 MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G3105 , MSPM0G3106 , MSPM0G3107 , MSPM0G3505 , MSPM0G3506 , MSPM0G3507
The MSPM0G series devices use a 3.3-V logic level (excluding ODIO). If you need to communicate with 1.8-V devices and do not use external level shifter devices, Figure 8-2 shows a suggested circuit for interfacing with a 1.8-V device.
Two MOSFET are used in this circuit - check the VGS to ensure this MOSFET can fully turn on with a low RDS(on): for 1.8-V device, use less than 1.8-V VGS MOSFET. However, too low VGS MOSFET, can cause the MOSFET to turn on at a very small voltage (MCU logic judges it as 0), resulting in communication logic error.