STMPE812BJR datasheet(14/51 Pages) STMICROELECTRONICS

Part #	STMPE812BJR

Description	S-Touch® enhanced 4-wire resistive touchscreen controller with PWM

PDF	51 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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14 / 51 page

Power modes

STMPE812

14/51

Doc ID 17732 Rev 3

Figure 6.

Power modes state diagram

On power up reset, the 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 STMPE812 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.

ACTIVE

AUTO -

HIBERNATE

I2C activity,

Touch, Hotkey

No activity

POR

Soft -Reset, Reset input

Reset Input

STMPE812 is in

active mode if PWM

is running

(about 33

μs)

Obsolete

Product(s)

- Obsolete

Product(s)

STMPE812BJR Datasheet(PDF) 14 Page - STMicroelectronics