OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MTCH101-I/OT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
MTCH101
DS40001664B-page 4 Preliminary 2012-2013 Microchip Technology Inc.
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
FIGURE 2-2: TYPICAL CIRCUIT WITH HOST MCU
MTI
V
SS
MTSA
MTPM
V
DD
MTO
MTCH101
1
2
3
Proximity Sensor
R3
4.7k
R4
10k
10kR5
1kR6
C1
0.1 µF
6
5
4
R1
R2
V
DD
VDD
VDD
VDD
MTI
V
SS
MTSA
MTPM
V
DD
MTO
MTCH101
1
2
3
Proximity Sensor
R1
4.7k
R2
10k
10k
R3
4.7k
R4
C1
0.1 µF
6
5
4
Host
Digital output
Digital input
DAC output
V
DD
VDD
2012-2013 Microchip Technology Inc. Preliminary DS40001664B-page 5
MTCH101
3.0 SENSITIVITY ADJUSTMENT
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
Figure 3-1 to Figure 3-4.
FIGURE 3-1: FIXED SENSITIVITY
USING RESISTOR
LADDER
FIGURE 3-2: HARDWARE SENSITIVITY
ADJUST USING
POTENTIOMETER
FIGURE 3-3: SENSITIVITY
CONTROLLED BY HOST
USING DAC
FIGURE 3-4: SENSITIVITY
CONTROLLED BY HOST
USING PWM
MTSA
R3
VDD
10k
Note: Both R1 and R2 are recommended to be
greater than 100K for lower power consumption.
R1
R2
Note 1: Application Note AN538, “Using PWM to
Generate Analog Output”
has details
about how to choose appropriate R and C
values.
MTSA
R2
10k
Host
DAC
MTSA
R
Host
PWM
C
MTCH101
DS40001664B-page 6 Preliminary 2012-2013 Microchip Technology Inc.
4.0 POWER MODE
The MTCH101 has two power mode options: Normal
mode and Low-Power mode. The state of the MTPM
pin determines the power mode.
4.1 Normal Mode Option
The device will run in Normal mode if the MTPM pin is
set high and no proximity or touch is detected. In this
mode, after an active scan, sleep time is between 69
and 105 ms, as shown in Figure 4-1. The sleep time
depends on the V
DD voltage, the lower the voltage, the
more time it will be in the Idle state.
FIGURE 4-1: NORMAL MODE
4.2 Low-Power Mode Option
The device will run in Low-Power mode if the MTPM pin
is set low and no proximity or touch is detected. In this
mode, after an active scan, sleep time is between 572
and 845 ms, as shown in Figure 4-2. As in Normal
mode, the sleep time depends on the V
DD voltage, the
lower the voltage, the more time it will be in the Idle
state.
FIGURE 4-2: LOW-POWER MODE
Note: If the device makes a proximity or touch
detection, it will automatically perform
active scans continually. Once the device
releases from its proximity-detected state,
it will return to the power mode set by the
MTPM pin.
MTI
Active
Scan
Sleep: 69~105 ms
MTI
Active
Scan
Sleep: 572~845 ms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MTCH101-I/OT

Mfr. #:
Buy MTCH101-I/OT
Manufacturer:
Microchip Technology
Description:
Proximity Sensors Proximity 1 Input 1 Output Adjustable
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet