STM8T141 STMicroelectronics, STM8T141 Datasheet - Page 23

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

STM8T141
7.4
7.4.1
Power modes
The STM8T141 device offers four power modes. The low power modes are specifically
designed for battery applications:
●
●
●
●
Burst cycles can occur either every 10 ms or 20 ms according to the selected sampling
period (t
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.
Table 8.
Normal Power mode
When in Normal Power mode, burst cycles occur at the rate of t
are added between burst cycles
Figure 16. Charge cycle timing diagram in Normal Power mode
C
Normal Power mode
Low Power mode with Zoom
Extreme Low Power mode with
Zoom
Extreme Low Power mode
S
1
Normal Power mode
Low Power mode with Zoom
Extreme Low Power mode with Zoom
Extreme Low Power mode
2
SAMPLING
Power mode
3
Low power period according to selected power mode
4
). By selecting low power modes, extra delays are interlaced between
5
6
Burst cycle duration
7
Doc ID 15699 Rev 7
Touch or proximity detection
Untouched
Touch or proximity detection
Untouched
(Figure
8
9
16).
10
Condition
11
12
13
14
15
SAMPLING
16
16 x t
16 x t
4 x t
17
t
LP
. No extra delays
Device operation
SAMPLING
SAMPLING
SAMPLING
18
value
0
0
0
19
20
23/50
t