STMPE321 ST Microelectronics, STMPE321 Datasheet - Page 9

• Manufacturer Part Number: STMPE321
• Description: 3-channel capacitive touch key controller
• Manufacturer: ST Microelectronics

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STMPE321
2.2
Power management
The STMPE321 operates in 3 states, as described below:
Figure 5.
On RESET, the STMPE321 enters the ACTIVE state immediately.
Upon a fixed period of inactivity, the device enters a SLEEP state. Any touch activity
occurring during a SLEEP state causes the device to return to an ACTIVE state.
In SLEEP mode:
-Calibration continues if the F2A bit is set in the CONTROL register
-Calibration stops if the F2A bit is NOT set in the CONTROL register
If no touch activity is expected, the host may set the device to a HIBERNATE state to save
power.
If any key is touched and held, the I
hold until the key is released.
STMPE321 operating states
Doc ID 15791 Rev 1
2
C command to enter SLEEP or HIBERNATE is put on
Capacitance compensation
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