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STMPE1801 Datasheet(PDF) 22 Page - STMicroelectronics

Part # STMPE1801
Description  Xpander Logic™ 18-bit enhanced port expander with keypad controller
PDF  60 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE1801 Datasheet(HTML) 22 Page - STMicroelectronics

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Clocking system
STMPE1801
22/60
Doc ID 17884 Rev 3
8
Clocking system
In order to reduce the power consumption, the STMPE1801 turns off the oscillator during
Hibernate mode.
Figure 5.
Clocking system
8.0.1
Clock source
By default, when the STMPE1801 powers up, it derives a 32 kHz clock from the internal RC
oscillator for its operation.
There are 4 sources of reset:
●
RSTB pin
●
Low voltage detect (LVD) reset
●
Soft reset bit of the SYS_CTRL register
●
I2C reset from the I2C block.



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