Power Mode............................................................................................................................................................................... 6
Interface with the Host ............................................................................................................................................................... 8
Packaging Information ............................................................................................................................................................. 12
Index ........................................................................................................... ........................................................................................ 16
The Microchip Web Site ....................................................................................................................................................................... 17
Customer Change Notification Service ................................................................................................................................................ 17
Customer Support ................................................................................................................................................................................ 17
Product Identification System .............................................................................................................................................................. 18
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DS40001664B-page 2
Preliminary
2012-2013 Microchip Technology Inc.
MTCH101
1.0
DEVICE OVERVIEW
The MTCH101 provides an easy way to add proximity
or touch detection to any human interface application.
The device integrates a single-channel capacitive
proximity detection, which can work through plastic,
glass or wood-front panel. It also supports a wide range
of conductive materials as sensor, like copper pad on
PCB, silver or carbon printing on plastic, Indium Tin
Oxide (ITO) pad, wire/cable, etc. On-board adjustable
sensitivity and power mode selection allow the user to
configure the device at run time easily. An active-low
output will communicate the state of the sensor to a
host/master MCU, or drive an indication LED (see
Figure 1-1).
FIGURE 1-1:
BLOCK DIAGRAM
Proximity
Scan Driver
Power Mode
Control
Proximity Sensor
ADC
Data Filtering
Proximity
Decoding
State Output
Host/
Discrete
Components
MTCH101
Sensitivity Adjust
2012-2013 Microchip Technology Inc.
Preliminary
DS40001664B-page 3
MTCH101
2.0
TYPICAL CIRCUIT
The MTCH101 can work either as a stand-alone device
to control a LED (see
Figure 2-1)
to indicate touch/
proximity, or work with host MCU (see
Figure 2-2).
FIGURE 2-1:
TYPICAL CIRCUIT AS STAND-ALONE
Proximity Sensor
V
DD
MTCH101
R3 1
4.7k
V
DD
R1
R4 3
R2
10k
MTSA
MTO
4
2
V
SS
V
DD
5
C1
0.1 µF
R6
MTI
MTPM
6
V
DD
V
DD
R5
10k
1k
FIGURE 2-2:
Proximity Sensor
TYPICAL CIRCUIT WITH HOST MCU
Host
MTCH101
R1 1
4.7k
2
V
SS
R2 3
10k
DAC output
V
DD
5
C1
0.1 µF
4
R4
MTI
MTPM
6
R3
Digital output
10k
V
DD
V
DD
4.7k
Digital input
MTSA
MTO
DS40001664B-page 4
Preliminary
2012-2013 Microchip Technology Inc.
MTCH101
3.0
SENSITIVITY ADJUSTMENT
FIGURE 3-3:
The sensitivity of the system determines how far and
fast it can respond to proximity or touch. The MTCH101
provides the MTSA pin to adjust the sensitivity, and the
voltage on this pin will determine the sensitivity. V
DD
voltage will give the lowest sensitivity, while GND
voltage will give the highest sensitivity.
The device will sample the voltage on the MTSA pin
after each scan, so it does not only support setting a
fixed sensitivity by a resistor ladder, but it also allows
adjusting the sensitivity dynamically, while the device is
running. A Digital-to-Analog Converter (DAC)
controlled by the host, or a hardware potentiometer can
be used to adjust the sensitivity. See typical circuit in
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