MTCH102T-ESLASHSS datasheet(10/37 Pages) MICROCHIP

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MTCH102/5/8

DS40001793C-page 10

Preliminary

 2015-2016 Microchip Technology Inc.

4.0

POWER MODE AND TIMEOUT

RESET

The MTCH102/5/8 has three power mode options to

meet the needs of various applications: Normal mode,

Low-Power mode and Smart-Scheduling mode. The

state of the MTPM pin determines the power mode.

4.1

Normal Mode

The device will run in Normal mode if the MTPM pin is

connected to VDD. In this mode, the MTCH102/5/8 will

scan continuously; so it will achieve the shortest

response time among the three power modes, but also

the power consumption is the highest.

4.2

Low-Power Mode

The device will run in Low-Power mode if the MTPM pin

is connected to VSS. The device will go to Sleep for

256 ms after each round of sensor scans; so it will

achieve the lowest power consumption, but it will have

the longest response time among the three power

modes, as shown in Figure 4-1.

FIGURE 4-1:

LOW-POWER MODE

4.3

Smart-Scheduling Mode

The MTCH102/5/8 also implements a Smart-Scheduling

mode that allows a host to set the exact sampling rate by

pulsing the MTPM pin, as shown in Figure 4-2. The

minimum recognizable pulse width is 25 ns. If the MTPM

pin is toggled during a scan cycle, the device will skip the

next Sleep and immediately start a new set of scans.

FIGURE 4-2:

SMART-SCHEDULING

MODE

4.4

Timeout Reset

The device keeps track of the activated state duration

for each MTIx input channel. The sensor state will be

reset once the activated state duration exceeds the

timeout duration, and the associated MTOx pin will

release the line.

For the Normal and Low-Power modes, the timeout

duration is 10 seconds. For the Smart-Scheduling

mode, the timeout duration is 400 multiplied by the

scan interval.

MTIx

Burst Scan

Sleep:256 ms

MTIx

Burst Scan

Sleep

MTPM

Scan Interval

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