CTPM Application Note
2
FocalTech Systems, Ltd. Confidential
1 I
2
C Interface
1.1 CTPM interface to Host
Figure 1-1 shows how CTPM communicates with the Host，there are three kind of communication between
CTPM and Host，we will introduce each communication in this section.
Transfer the data via I
2
C
Send interrupt when there is a valid touch
Host send Wakeup signal to CTPM
CTP
CTP
Controller
TX
RX
MCU Host
Serial
Interface
/INT
/WAKE
Figure 1-1 CTPM and Host connection
The Power Supply voltage of CTPM is 2.8V~3.3V, interface supply voltage is 2.8V~3.3V. There are Control
Interface and Data Interface. As
Figure 1-1 demonstrates, Serial interface is the data interface, /INT and /WAKE are
the control inte
rface. For the detail, please refer to Table 1-1.
Table 1-1 Des
cription for TP module and Host interface
Port Name Voltage Polar Description
Serial
interface
2.8~3.3V Serial interface is for data transfer between Host and CTPM.
CTPM support both I2C and SPI interface
/INT 2.8~3.3V LOW The interrupt from the CTPM to the Host
/WAKE* 2.8~3.3V LOW Wakeup signal from host to the CTPM
1.2 I
2
C Read/Write Interface description
Write N bytes to I2C slave
S
A
6
A
5
A
4
A
3
A
2
A
1
A
0
R
W
A
R
6
R
5
R
4
R
3
R
2
R
1
R
0
A
R
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
A
D
7
…
D
6
D
5
D
4
D
3
D
2
D
1
D
0
A
D
7
P
Slave Addr Data Address[X] Data [X] Data [X+N-1]
START
WRITE
ACK
ACK
ACK
ACK
STOP
Set Data Address
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