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STM8T141 Datasheet(PDF) 23 Page - STMicroelectronics

No. de pieza STM8T141
Descripción Electrónicos  Single-channel capacitive sensor for touch or proximity detection with shielded sensing electrode
PDF  50 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8T141 Datasheet(HTML) 23 Page - 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
0
Low Power mode with Zoom
Touch or proximity detection
0
Untouched
4 x tSAMPLING
Extreme Low Power mode with
Zoom
Touch or proximity detection
0
Untouched
16 x tSAMPLING
Extreme Low Power mode
16 x tSAMPLING
12
345678
9
10
11
12
13
14
15
16
17
18
19
20
CS
Burst cycle duration
t



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