STM8T141 STMicroelectronics, STM8T141 Datasheet - Page 24

• Manufacturer Part Number: STM8T141
• Description: Single-channel capacitive sensor for touch or proximity detection with shielded sensing electrode
• Manufacturer: STMicroelectronics

Device operation
7.4.2
7.4.3
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Low Power mode with Zoom
With the STM8T141 in Low Power mode with Zoom, burst cycles occur every 5th t
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 t
return to Low Power mode after an end of low power period (t
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
Figure 17. Charge cycle timing diagram in Low Power mode with Zoom
Extreme Low Power mode with Zoom
With the STM8T141 in Extreme Low Power Mode with Zoom, burst cycles only occur every
17th t
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 t
will return to Low Power mode after an end of low power period (t
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
Figure 18. Charge cycle timing diagram in Extreme Low Power mode with Zoom
C
C
S
S
1
1
SAMPLING
2
2
17).
18).
3
3
t
LP
4
4
period (or 5.88% of the Normal Power mode).
Burst cycle every 17th t
5
5
Burst cycle
duration
6
6
7
7
Doc ID 15699 Rev 7
8
8
SAMPLING
9
9
t
LP
10
10
period
11
11
12
12
Zoom to Normal mode after touch
or proximity detection occurred
13
13
14
14
SAMPLING
Zoom to Normal mode after touch
or proximity detection occurred
ELP
15
15
) when no touch or
ELP
16
16
) when no touch or
period. The device will
SAMPLING
17
17
18
18
. The device
19
19
STM8T141
SAMPLING
20
20
t
t