STM8T141 datasheet(23/50 Pages) STMICROELECTRONICS

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STM8T141

Device operation

Doc ID 15699 Rev 7

23/50

7.4

Power modes

The STM8T141 device offers four power modes. The low power modes are specifically

designed for battery applications:

●

Normal Power mode

●

Low Power mode with Zoom

●

Extreme Low Power mode with Zoom

●

Extreme Low Power mode

Burst cycles can occur either every 10 ms or 20 ms according to the selected sampling

period (tSAMPLING). By selecting low power modes, extra delays are interlaced between

bursts. This improves the device current consumption at the expense of the response time.

Bits [7:6] of option byte OPT0 are used to select the correct power mode.

7.4.1

Normal Power mode

When in Normal Power mode, burst cycles occur at the rate of tSAMPLING. No extra delays

are added between burst cycles (Figure 16).

Figure 16.

Charge cycle timing diagram in Normal Power mode

Table 8.

Low power period according to selected power mode

Power mode

Condition

tLP value

Normal Power mode

Low Power mode with Zoom

Touch or proximity detection

Untouched

4 x tSAMPLING

Extreme Low Power mode with

Zoom

Touch or proximity detection

Untouched

16 x tSAMPLING

Extreme Low Power mode

16 x tSAMPLING

345678

Burst cycle duration

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