CH452 and 2-wire interface to connect single-chip microcomputer

Single chip microcomputer STM32L151CCU6

1206RGB (single)

L06ESDL5V0H4-2

C-2

The CH452 and 2-wire interface are connected to the H3L2 pin of the single-chip circuit U2 (CH452 in the 28-pin package), and the CH452 is connected to the M1 through the 2-wire serial interface.
When the keyboard function is not needed, the KEY signal line can be omitted, and only the SCL and SDA signal lines are used; when the keyboard function is used, the KEY signal line of the INT# pin of the CH452 can be connected to the interrupt input pin of the microcontroller. Or the ordinary I / O pin for query, if the key interrupt output mode selects "low pulse", then you can also use SDA instead of INT# to provide keyboard interrupt to the microcontroller.