STMPE1601 STMicroelectronics, STMPE1601 Datasheet - Page 21

• Manufacturer Part Number: STMPE1601
• Description: 16-bit Enhanced Port Expander With Keypad And Pwm Controller Xpander Logic
• Manufacturer: STMicroelectronics

STMPE1601
7.2
7.3
Autosleep
The host system may configure the STMPE1601 to go into sleep mode automatically
whenever there is a period of inactivity following a complete I
STMPE1601. This inactivity means there is no intended I
example, if there is Ian
STMPE1601 device will still be counting down for the auto-sleep. The STMPE1601 device
resets the autosleep time-out counter only when it receives an I
device itself. This autosleep feature is controlled by the SYS_CTRL_2 (system control
register 2).
All those events that trigger an interrupt (KPC, hot-key) would result in a transition from
Sleep state to Operational state automatically. The wakeup can also be performed through
the I
Keypress detect in the hibernate mode
When in Hibernate mode, a keypress detect causes the system to go into sleep mode. The
sleep clock (32 kHz) is then used to debounce the key to detect a valid key. If the keypress is
detected to be valid, the system stays in sleep mode. If the key is detected to be invalid, the
system goes back into Hibernate mode.
2
C transaction intended for the device.
2
C transaction sent by the host to other slave devices, the
2
C transaction for the device. For
2
C transaction with the
2
C transaction meant for the
System controller
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