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STMPE1601 Datasheet(PDF) 22 Page - STMicroelectronics

Part # STMPE1601
Description  16-bit enhanced port expander with keypad and PWM controller Xpander Logic
PDF  58 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE1601 Datasheet(HTML) 22 Page - STMicroelectronics

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Clocking system
STMPE1601
22/58
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 SYS_CTRL register.
To wake up the device, the host is required to:
–
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 SYS_CTRL 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



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