MTCH112
Dual Channel Proximity Touch Controller Product Brief
• Capacitative Proximity Detection System:
- High Signal to Noise Ratio (SNR)
- Adjustable sensitivity
- Noise Rejection Filters
- Scanning method actively optimized to
attenuate strongest noise frequencies
- Automatic calibration with optional user
presets
- Dynamic threshold management adjusts
sensitivity of sensor based on the level of
environmental noise
- Constant press calibration tracks the
expected offset when the sensor is pressed
and adjusts the threshold to automatically
achieve the best press/release behavior
- User-defined "minimum shift" values specify
the lowest amount of signal change to
activate a state transition. Automatic
thresholds never decrease below these
settings.
- Automatic Environmental Compensation
• No Required External Components
• Low-Power mode: Highly Configurable
Low-Power mode
- 1ms to 4s Sleep interval between sensor
samples
• Response Time as Low as 10 mS
• Hardware Error Detection notifies if either sensors
is shorted to VDD, VSS, or the other sensor
• Operating Voltage Range: 1.8V to 3.6V
• Operating Temperature: -40oC to +85oC
GENERAL DESCRIPTION
PACKAGE TYPE
The device is available in 8-lead SOIC and DFN.
FIGURE 1:
8-PIN SOIC, DFN DIAGRAM
FOR MTCH112
SOIC, DFN
VDD
1
8
VSS
MTO/INT
2
7
MTI1/MTGRD0
MTI0
3
6
SCL
RESET
4
5
SDA
TABLE 1:
Name
The Microchip mTouch™ MTCH112 Dual Channel
Proximity/Touch Controller provides an easy way to
add proximity and/or touch sensor detection to any
application. The device implements either two
capacitive sensors or one sensor and one active guard
driver. The optional device configuration through I2C™
allow presets to be loaded in a production environment.
Automatic calibration routines are used by default to
choose the best options, so user configuration is not
required.
2012 Microchip Technology Inc.
The MTCH112 uses a sophisticated optimization
algorithm to actively eliminate noise from the signal.
While the noise level is being measured, the
requirements for a proximity or touch detection are
updated to reflect the degree of uncertainty in the
readings. When a press is detected for the first time,
the threshold is automatically calibrated to choose a
smart threshold for the ‘release’ and next press. This
creates a system that dynamically optimizes the signalto-noise ratio for its environment.
MTCH112
FEATURES
8-PIN DESCRIPTION
8-Pin SOIC
and DFN
Description
VDD
1
Power Supply Input
MTO/INT
2
Detect Output (Active-Low)
Notification Interrupt Pin
MTI0
3
Proximity/Touch Sensor
Input
RESET
4
Device Reset (Active-Low)
SDA
5
I2C™ Data
SCL
6
I2C™ Clock
MTI1/
MTGRD0
7
Proximity/Touch Sensor
Input and Active Guard
Shield for MTI0
VSS
8
Ground Reference
Advance Information
DS41659A-page 1
MTCH112
TABLE 2:
POWER CONSUMPTION
CLKSEL
16 MHz
SLEEP (S)
1.8V
3.0V
Typ (µA)
Typ (µA)
CLKSEL
32 MHz
3.6V
SLEEP (S)
Typ (µA)
Typ (µA)
0
640
990
0
1952
2350
0.001
580
900
0.001
1780
2140
0.002
540
830
0.002
1630
1970
0.004
460
710
0.004
1400
1690
0.008
360
560
0.008
1090
1320
0.016
250
390
0.016
760
915
0.032
160
240
0.032
470
570
0.064
89
140
0.064
270
320
0.128
48
74
0.128
150
170
0.256
25
38
0.256
75
91
0.512
13
20
0.512
39
46
1
6.8
11
1
20
24
2
3.6
5.5
2
10
12
4
1.9
3.0
4
5
6
8
1.1
1.8
8
3
3
16
0.7
1.1
16
1.7
2
32
0.5
0.8
32
1
1
64
0.4
0.7
64
0.8
0.9
128
0.3
0.6
128
0.7
0.7
256
0.3
0.5
256
0.6
0.6
PIN DESCRIPTION
MTO
MTI
Connect the sensor to this input. An additional resistor
of at least 4.7k is recommended for best noise
immunity. Sensors up to 40 pF in capacitance are
supported. Sensors work best when the base
capacitance is minimized. This will maximize the
percentage change in capacitance when a finger is
added to the circuit.
MTGRD0
The waveform on MTGRD0 will shield or guard MTI0's
sensor from the effect of nearby noise sources or
power planes if MTGRD0's trace surrounds MTI0's
trace and sensor. The pin will be driven in phase with
MTI0 to minimize the voltage differential between the
two pins. This does not interfere with measuring
capacitive changes on the MTI1 sensor.
DS41659A-page 2
3.0V
The mTouchTM output pin is always driven to either VDD
or VSS by the device. The MTCH112 OUTCON register
determines the behavior of the MTO/INT pin. The pin is
always active-low, but the states in which this output
occurs can be adjusted in the device's OUTCON
register. If no options are selected for output states, the
MTO pin acts as an interrupt to a master device. The
MTCH112 will pulse low for at least 1ms if any state
changes occur. Further information must be
determined by communicating through I2C with the
device.
SDA/SCL
These pins are the serial data (SDA) and clock (SCL)
connections of the I2C interface. They should be
connected to the I2C master SDA and SCL signals with
a 1.5k pull-up resistor to VDD.
Advance Information
2012 Microchip Technology Inc.
MTCH112
REVISION HISTORY
Revision A (October 2012)
Initial release of this Product Brief.
2012 Microchip Technology Inc.
Advance Information
DS41659A-page 3
MTCH112
NOTES:
DS41659A-page 4
Advance Information
2012 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
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•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
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•
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•
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Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash
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MTP, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
Analog-for-the-Digital Age, Application Maestro, BodyCom,
chipKIT, chipKIT logo, CodeGuard, dsPICDEM,
dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
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SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
GestIC and ULPP are registered trademarks of Microchip
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All other trademarks mentioned herein are property of their
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© 2012, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 9781620766361
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2012 Microchip Technology Inc.
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Advance Information
DS41659A-page 5
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