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STMPE821 Datasheet(PDF) 10 Page - STMicroelectronics

Part # STMPE821
Description  8-channel capacitive touch key controller
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE821 Datasheet(HTML) 10 Page - STMicroelectronics

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STMPE821 functional overview
STMPE821
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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.



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