STMPE821_09 datasheet(10/55 Pages) STMICROELECTRONICS

tên linh kiện	STMPE821

Giải thích chi tiết về linh kiện	8-channel capacitive touch key controller

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STMPE821 functional overview

STMPE821

10/55

1.5

Power management

The STMPE821 operates in 3 states.

Figure 4.

STMPE821 operating states

On RESET, the STMPE821 enters the ACTIVE state immediately.

Upon a fixed period of inactivity, the device enters into the SLEEP state. Any touch activity in

SLEEP state would cause the device to go back to ACTIVE state.

In SLEEP mode:

-Calibration continues if F2A bit is set in CONTROL register

-Calibration stops if F2A bit is NOT set in CONTROL register

If no touch activity is expected, the host may set the device into HIBERNATE state to save

power.

If any key is touched and held, the I2C command to enter sleep or hibernate will be put on

hold, until the key has been released.

Số phần tương tự - STMPE821_09

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