DM160220 datasheet(7/20 Pages) MICROCHIP

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 2012-2013 Microchip Technology Inc.

Preliminary

DS40001664B-page 7

MTCH101

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

5.2

Reset by Touch and Release

A stuck release mechanism is implemented for this

device.

When

the

device

stuck

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

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.

MTPM

>4.5 ms

Normal mode

Low-Power mode

Finger touches the sensor pad

Finger releases

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