ST STMPE2401, User Manual, Page: 17 / 22

UM0300 Running the STMPE2401 port expander demo board
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Figure 22. Entering in hibernate mode
A “sleep” mode is also available. A corresponding message appears on the LCD screen as
well.
In Hibernate mode, as the clock to PWM is stopped, output LEDs stop blinking. While in
sleep mode, PWM keeps running as these are controlled by the 32 KHz clock. In order to
wake up the demo in low power mode, click the "Wake Up" button. A message in the Scan
Window appears as soon as the demo comes out of the power down mode as shown in
Figure 23 .You can also wake up the demo from the sleep mode by clicking any normal key
or dedicated key available on the demo board.
Figure 23. Wake-up from hibernate mode