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STMPE812ABJR bảng dữ liệu(PDF) 16 Page - STMicroelectronics

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STMPE812ABJR bảng dữ liệu(HTML) 16 Page - STMicroelectronics

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Power modes
STMPE812A
16/53
Doc ID 18225 Rev 4
Figure 6.
Power modes state diagram
On power up reset, device goes to active state. However, as all the functional blocks are
clocked off by default, no touch/hotkey activity is possible. If there are no I2C activities,
device goes into auto-hibernate mode automatically.
The auto-hibernate feature of STMPE812A is always enabled. Whenever there is a period of
inactivity, the device enters this mode to reduce power consumption. On detection a touch,
correctly addressed I2C data, GPIO activity, the device wakes up immediately.
As the device is able to wake up very quickly, there is no loss of touch data.
AM04141V1
ACTIVE
AUTO -
HIBERNATE
I2C activity,
Touch, Hotkey
No activity
POR
Soft -Reset, Reset input
Reset Input
STMPE812A is in
active mode if PWM
is running
(about 33
μs)



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