STMPE2403 datasheet(24/63 Pages) STMICROELECTRONICS

No de pièce	STMPE2403

Description	24-bit Enhanced port expander with Keypad and PWM controller Xpander logic

PDF	63 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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24 / 63 page

Clocking system

STMPE2403

24/63

8.2

Power mode programming sequence

To put the device in sleep mode, the following needs to be done by the host:

Write a '1' to bit 4 of the SYSCON register.

To wakeup the device, the following needs to be done by the host:

Assert a wakeup routine on the I2C bus by sending the Start Bit, followed by the device

address and the Write bit. Subsequently, proceed with sending the Base Register address

and continue with a normal I2C transaction. The device wakes up upon receiving the

correct device address and in Write direction. In other words, the procedure of waking up

the device is performed by just sending an I2C transaction to the device. This procedure

can be extended to wake up the device that is in hibernate mode.

To do a soft reset to the device, the host needs to do the following:

Write a '1' to bit 7 of the SYSCON register.

This bit is automatically cleared upon reset.

To go into Hibernate mode, the following needs to be done by the host:

Set the Disable_32K bit to '1'

To come out of the Hibernate mode, the following needs to be done by the host:

Assert a system reset or

Put a wakeup on the I2C

STMPE2403 Fiches technique(PDF) 24 Page - STMicroelectronics