STM8T143 STMicroelectronics, STM8T143 Datasheet - Page 31

• Manufacturer Part Number: STM8T143
• Description: Single-channel capacitive sensor for touch and proximity detection
• Manufacturer: STMicroelectronics

STM8T143
6.2.2
Control mode
In Control mode, pin 8 can be used to halt the conversion or to freeze the reference (refer to
Section 5.4: Dynamic calibration
Halt conversion control mode
When the conversion is halted, the device is in low power consumption state (see device
electrical characteristics). In this state, the CTRL pin can be used to manage the power
consumption and/or control the acquisition to synchronize the sampling burst with external
events. This can be useful, for example, to halt acquisitions during noisy operations or to
synchronize an acquisition with the noise period.
When the CTRL pin is tied high for longer than t
once the current conversion has been completed. The device remains in this Halt mode until
the CTRL line is tied low again. An automatic recalibration is performed directly after the
CTRL pin is released to compensate for any environmental changes which might have
occurred during the halt duration.
Reference freeze control mode
In this mode, the device reference evolution can be frozen according to the CTRL pin state.
The CTRL pin has precedence over the configuration bits selected for the reference freeze
timeout.
This function can be used to implement user-dedicated ECS management.
When the CTRL pin is tied high for longer than t
low.
If the host freezes the reference at device startup, the calibration starts after the reference
freeze is released.
Forced recalibration
Generating a pulse of t
ECS is reset, clearing the output state. Please refer to
characteristics
If the signal value is outside its allowable range, the device forces an AET process event.
(refer to
Section 5.1: Automatic electrode tuning
for t
recal_control
recal_control
constraints.
Doc ID 18315 Rev 3
(DYCAL)).
duration on the CTRL pin recalibrates the reference. The
CTRL
CTRL
(AET))
, the charge conversion cycle is halted,
, the filter is halted until this pin is tied
Table 17: General capacitive sensing
Device operation
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