MTCH102 Datasheet, PDF (10/37 Pages) Microchip Technology – 2, 5 and 8-Channel Proximity/Touch Controller Data Sheet

MTCH102/5/8
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:
Burst Scan
LOW-POWER MODE
Sleep:256ms
FIGURE 4-2:
SMART-SCHEDULING
MODE
Burst Scan
Sleep
MTIx
Scan Interval
MTPM
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
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.
DS40001793C-page 10
Preliminary
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