STMPE1601_1 datasheet(21/61 Pages) STMICROELECTRONICS

No. de pieza	STMPE1601

Descripción Electrónicos	16-bit enhanced port expander with keypad and PWM controller Xpander Logic

PDF	61 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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21 / 61 page

STMPE1601

System controller

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7.2

Autosleep

The host system may configure the STMPE1601 to go into sleep mode automatically

whenever there is a period of inactivity following a complete I2C transaction with the

STMPE1601. This inactivity means there is no intended I2C transaction for the device. For

example, if there is an I2C transaction sent by the host to other slave devices, the

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 I2C transaction meant for the

device itself. This autosleep feature is controlled by the SYS_CTRL_2 (system control

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 I2C transaction intended for the device.

7.3

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.

STMPE1601 Datasheet(PDF) 21 Page - STMicroelectronics