MTCH101 Datasheet, PDF (7/20 Pages) Microchip Technology – Single-Channel Proximity Detector

5.0 RESET
The MTCH101 can be stuck in a proximity-detected
state in some cases, such as sudden temperature
change, or higher dielectric materials (metal, wood or
glass) present near the sensor. Two methods can be
used to release the proximity-detected state without
repowering the device.
5.1 Reset by the MTPM pin
Changing the state of the MTPM pin, either from
low-to-high or from high-to-low, will reset the proximity
detection system and release the detection state. If the
device needs to keep the same power mode, then a
pulse, which holds at least 4.5 ms, can be used to reset
the device (see Figure 5-1). This reset method can be
used at anytime during the operation, not only when the
state is stuck in a proximity-detected state.
FIGURE 5-1:
RESET PULSE DURATION
REQUIREMENT
>4.5 ms
MTCH101
5.2 Reset by Touch and Release
A stuck release mechanism is implemented for this
device. When the device is stuck in a
proximity-detected state, the user can touch the sensor
pad and then release. This action will release the
proximity-detected state (see Figure 5-2).
FIGURE 5-2:
RESET BY TOUCH AND
RELEASE
Finger touches the sensor pad
MTPM
MTPM
Low-Power mode
>4.5 ms
Normal mode
Note: In non-detected state, because the device
goes to Sleep for a certain time, the Reset
pulse duration should be 4.5 ms plus the
Sleep time.
Finger releases
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Preliminary
DS40001664B-page 7