MTCH102/105/108
2, 5 and 8-Channel Proximity/Touch Controller Product Brief
Description
The Microchip mTouch
®
MTCH102/105/108 Proximity/Touch Controller with simple digital output provides an easy way
to add proximity and/or touch detection to any application. This device family implements capacitive sensors with active
guarding capability. The sensitivity and power mode can be configured through the MTSA and MTPM pins. The
MTCH102/105/108 devices also use an advanced optimization algorithm to actively suppress noise from the signal to
achieve reliable proximity/touch detection.
Features
• Capacitive Proximity and Touch Detection System:
- High Signal to Noise Ratio (SNR)
- Adjustable sensitivity with compensation for
different sensor sizes
- Multi-stage Active noise suppression filters
- Automatic environmental compensation
- Support for wide range of sensor shape and
size
• Simple I/O Interface with existing System
• Smart Scan Scheduling
• Threshold Hysteresis
• Flexible Low-Power mode
• Brown-Out Protection
• Operating Voltage Range: 2.05V to 3.6V
• Operating Temperature: -40°C to +85°C
Application
•
•
•
•
•
Light Switch
Portable Device Enabler
White Goods and Appliance
Office Equipment and Toys
Display and Keypad Back-Lighting Activation
TABLE 1:
Device
MTCH101
MTCH102
MTCH105
MTCH108
Note 1:
A:
B:
MTCH10X FAMILY TYPES
Data Sheet Index
(A)
(B)
(B)
(B)
Sensor Input
1
2
(1)
5
(1)
8
(1)
Active Guard
N
Y
(1)
Y
(1)
Y
(1)
Digital Output
1
2
5
8
One of the sensor inputs can be configured as active guard output.
DS-40001664
Future Release
MTCH101 Single-Channel Proximity Detector
MTCH102/105/108 Dual-Channel Proximity/Touch Controller
Data Sheet Index:
(Unshaded devices are described in this document.)
Note:
For other small form-factor package availability and marking information, please visit
http://www.microchip.com/packaging
or contact your local sales office.
TABLE 2:
MTCH102
MTCH105
MTCH108
PACKAGES
MSOP
X
X
X
TSSOP
SSOP
UDFN
X
X
X
QFN
Packages
2015 Microchip Technology Inc.
Advance Information
DS40001780A-page 1
MTCH102/105/108
PIN DIAGRAMS
FIGURE 1:
8-LEAD SOIC, DFN
FIGURE 4:
V
DD
MTI0
MTI1
20-LEAD TSSOP
1
2
3
MTCH108
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
SS
MTO0
MTO1
MTSA
MTO2/GC
MTO3
MTO4
MTO5
MTO6
MTO7
V
DD
1
MTI0
MTPM
2
4
MTCH102
MTI1/Guard 3
8 V
SS
7 MTO0
6 MTO1/GC
5 MTSA
MTPM
MTI2/Guard
MTI3
MTI4
MTI5
MTI6
MTI7
Note:
See
Table 3
for the pin allocation table.
Note:
See
Table 5
for the pin allocation table.
FIGURE 2:
V
DD
MTI0
14-LEAD SOIC
1
2
MTCH105
FIGURE 5:
20-LEAD QFN
MTI0
V
DD
V
SS
MTO0
MTI1
14
13
12
11
10
9
8
V
SS
MTO0
MTO1
MTSA
MTO2/GC
MTO3
MTO4
MTPM
MTI2/Guard
MTI3
MTI4
MTI5
1
2
3
4
5
MTI1 3
MTPM 4
MTI2/ Guard
MTI3
MTI4
5
6
7
20
19
18
17
16
MTCH108
15
14
13
12
11
MTO1
MTSA
MTO2/GC
MTO3
MTO4
Note:
See
Table 4
for the pin allocation table.
Note:
See
Table 5
for the pin allocation table.
FIGURE 3:
16-LEAD QFN
V
DD
NC
NC
V
SS
16
15
14
13
MTI0
MTI1
MTPM
MTI2/Guard
1
2
3
4
MTCH105
12
11
10
9
MTO0
MTO1
MTSA
MTO2/GC
Note:
See
Table 4
for the pin allocation table.
MTI3
MTI4
MTO4
MTO3
5
6
7
8
DS40001780A-page 2
Advance Information
2015 Microchip Technology Inc.
MTI6
MTI7
MTO7
MTO6
MTO5
6
7
8
9
10
MTCH102/105/108
PIN ALLOCATION TABLES
TABLE 3:
Name
V
DD
MTI0
MTI1/Guard
MTPM
MTSA
MTO1/GC
MTO0
V
SS
8-PIN DESCRIPTION (MTCH102)
8-Lead SOIC
and DFN
1
2
3
4
5
6
7
8
Power Supply Input
Proximity/Touch Sensor 0 Input
Proximity/Touch Sensor 1 Input/Active Guard
Low-Power Mode Select
Sensitivity Adjust Input
MTI1 Detect Output (Active-Low)/Guard Control
MTI0 Detect Output (Active-Low)
Ground
Description
TABLE 4:
Name
V
DD
MTI0
MTI1
MTPM
MTI2/Guard
MTI3
MTI4
MTO4
MTO3
MTO2/GC
MTSA
MTO1
MTO0
V
SS
14-,16-PIN DESCRIPTION (MTCH105)
14-Lead
SOIC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16-Lead
QFN
16
1
2
3
4
5
6
7
8
9
10
11
12
13
Power Supply Input
Proximity/Touch Sensor 0 Input
Proximity/Touch Sensor 1 Input
Low-Power Mode Select
Proximity/Touch Sensor 2 Input/Active Guard
Proximity/Touch Sensor 3 Input
Proximity/Touch Sensor 4 Input
MTI4 Detect Output (Active-Low)
MTI3 Detect Output (Active-Low)
MTI2 Detect Output (Active-Low) /Guard Control
Sensitivity Adjust Input
MTI1 Detect Output (Active-Low)
MTI0 Detect Output (Active-Low)
Ground
Description
2015 Microchip Technology Inc.
Advance Information
DS40001780A-page 3
MTCH102/105/108
TABLE 5:
Name
V
DD
MTI0
MTI1
MTPM
MTI2/Guard
MTI3
MTI4
MTI5
MTI6
MTI7
MTO7
MTO6
MTO5
MTO4
MTO3
MTO2/GC
MTSA
MTO1
MTO0
V
SS
20-PIN DESCRIPTION (MTCH108)
20-Lead
TSSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
20-Lead
QFN
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Power Supply Input
Proximity/Touch Sensor 0 Input
Proximity/Touch Sensor 1 Input
Low-Power Mode Select
Proximity/Touch Sensor 2 Input/Active Guard
Proximity/Touch Sensor 3 Input
Proximity/Touch Sensor 4 Input
Proximity/Touch Sensor 5 Input
Proximity/Touch Sensor 6 Input
Proximity/Touch Sensor 7 Input
MTI7 Detect Output (Active-Low)
MTI6 Detect Output (Active-Low)
MTI5 Detect Output (Active-Low)
MTI4 Detect Output (Active-Low)
MTI3 Detect Output (Active-Low)
MTI2 Detect Output (Active-Low)/Guard Control
Sensitivity Adjust Input
MTI1 Detect Output (Active-Low)
MTI0 Detect Output (Active-Low)
Ground
Description
PIN DESCRIPTION
MTIx
Connect the sensor to this input. An additional resistor
of at least 4.7 kΩ is recommended for high-frequency
noise immunity.
GC
By grounding the GC pin, the active guard signal will be
enabled on the Guard pin.
MTSA
The voltage will determine the sensitivity. V
DD
voltage
will give the lowest sensitivity while GND voltage will
give the highest. A linear voltage sensitivity is imple-
mented between V
DD
and GND. A resistor ladder is
used to adjust the sensitivity.
GUARD
The waveform on the Guard pin will shield or guard
MTIx’s sensor from the effect of nearby noise sources
or power planes if the guard trace surrounds MTIx’s
trace and sensor. The Guard pin will be driven in phase
with MTIx to minimize the voltage difference between
the two pins.
MTPM
By grounding the MTPM pin, the MTCH102/105/108
will be in Low-Power mode, thus having a slower
response time. When the MTPM pin is at V
DD
, the
power consumption will be higher with a faster
response time.
MTOx
The MTOx pin is an open-drain output, which reports
the proximity/touch state of MTIx. A pull-up resistor is
required, and it will pull the line low when proximity/
touch is detected, and release the line when proximity/
touch is released.
DS40001780A-page 4
Advance Information
2015 Microchip Technology Inc.
MTCH102/105/108
TYPICAL CIRCUIT
FIGURE 6:
SYSTEM DIAGRAM FOR MTCH10X
V
DD
Touch
Sensor
MTI0
MTPM
MTO0
…...
…...
…...
Touch
Sensor
Active Guard
Embedded Controller
MTIx
MTOx
MTSA
Note 1:
2:
MTI1/Guard for MTCH102 and MTI2/Guard for MTCH105/108.
MTO1/GC for MTCH102 and MTO2/GC for MTCH105/108.
2015 Microchip Technology Inc.
Advance Information
DS40001780A-page 5
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