STM8T141 datasheet(24/50 Pages) STMICROELECTRONICS

24 / 50 page

Device operation

STM8T141

24/50

Doc ID 15699 Rev 7

7.4.2

Low Power mode with Zoom

With the STM8T141 in Low Power mode with Zoom, burst cycles occur every 5th tSAMPLING

period (or 20% of the Normal Power mode).

Once activity is detected, the STM8T141 device wakes up from Low Power mode with Zoom

to Normal Power mode with charge cycles occurring every tSAMPLING period. The device will

return to Low Power mode after an end of low power period (tELP) when no touch or

proximity detection conditions are detected. This enables the device to reduce power

consumption when not in use, and still have a sufficient response time when needed

(Figure 17).

Figure 17.

Charge cycle timing diagram in Low Power mode with Zoom

7.4.3

Extreme Low Power mode with Zoom

With the STM8T141 in Extreme Low Power Mode with Zoom, burst cycles only occur every

17th tSAMPLING period (or 5.88% of the Normal Power mode).

Once activity is detected, the STM8T141 device wakes up from Extreme Low Power mode

and Zoom to Normal Power mode with charge cycles occurring every tSAMPLING. The device

will return to Low Power mode after an end of low power period (tELP) when no touch or

proximity detection conditions are detected. This enables the device to reduce power

consumption when not in use and still have a sufficient response time when needed

(Figure 18).

Figure 18.

Charge cycle timing diagram in Extreme Low Power mode with Zoom

345678

Zoom to Normal mode after touch

or proximity detection occurred

Burst cycle

duration

tLP

345678

Burst cycle every 17th tSAMPLING period

Zoom to Normal mode after touch

or proximity detection occurred

tLP

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