Datasheet
MTCH6301 PROJECTED CAPACITIVE TOUCH CONTROLLER
DS41663A-page 6 2012 Microchip Technology Inc.
4.0 LAYOUT
4.1 Typical Application Circuit
The following schematic portrays a typical application
circuit, based on a 12RX/9TX touch sensor.
FIGURE 4-1: TYPICAL APPLICATION CIRCUIT
4.2 Touch Sensor Design
Please refer to the mTouch Sensing Solution design
center at www.microchip.com/mtouch for additional
information regarding design and layout of touch
sensors.
4.3 Sensor Layout Configuration
To properly configure a sensor from a physical layout
standpoint, the following registers must be correctly
configured:
• RX Pin Map/TX Pin Map
• RX Scaling Coefficient/TX Scaling Coefficient
•Flip State
4.3.1 RX/TX PIN MAP
By default, the RX and TX pins are set as shown in the
Typical Application Circuit (Figure 4.1). If you require a
different layout or a different amount of sensor chan-
nels, the RX and TX pins are configured via pin map
arrays. To access these arrays, reference Section 5.0
“Communication Protocol” and Section 6.0 “Mem-
ory Map” of this document.
The RX and TX lines are configurable for the purpose
of making trace routing and board layout more conve-
nient. Please note that while RX pins can be used as
TX pins instead, a single pin cannot be used as BOTH
an RX and a TX channel concurrently. The pin maps
are comprised of “Pin Map ID” numbers, which are
shown in Table 4-1 .
Master I
2
C™
Controller
MTCH6301
TX3
TX2
TX1
TX0
VSS
VDD
RX0
RX1
RX2
RX3
RX4
30
31
32
33
29
28
27
26
25
24
23
4
3
2
1
5
6
7
8
9
10
11
TX15
TX16
TX17
SDA
TX14
VSS
VCAP
INT
N/C
RX12
RX11
TX9
TX10
TX11
SCL
VDD
VSS
TX5
TX6
TX7
TX8
TX4
41
42
43
44
40
39
38
37
36
35
34
RX9
RX10
TX12
TX13
VSS
VDD
RESET
RX8
RX7
RX6
RX5
15
14
13
12
16
17
18
19
20
21
22
10 µF
20k O
0.1 µF
0.1 µF
0.1 µF
RX0 RX11
TX0 TX8
GPIO/INT
SCL
SDA
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