MAX11803 Maxim Integrated Products, MAX11803 Datasheet - Page 40

• Manufacturer Part Number: MAX11803
• Description: (MAX11800 - MAX11803) Ultra-Small Resistive Touch-Screen Controllers
• Manufacturer: Maxim Integrated Products

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Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I
The sequence below shows the required command for-
mat for issuing conversion requests. A conversion
request cannot be paired with multiple commands or
instructions. Any conversion command issued while
previous commands are being executed is ignored.
The MAX11801/MAX11803 feature an I
2-wire serial interface consisting of a bidirectional serial
data line (SDA) and a serial clock line (SCL). SDA and
SCL facilitate bidirectional communication between the
MAX11801/MAX11803 and the master. The master (typ-
Figure 20. SPI Multiple-Byte Register Read Sequence
Figure 21. SPI Conversion Command
Figure 22. I
Figure 23. I
40
SPI Conversion Command (MAX11800/MAX11802)
SDA
SCL
SDA
SCL
______________________________________________________________________________________
START
START
DOUT
SCLK
2
2
C Single Register Write Sequence
C Multiple Register Write Sequence
DIN
CS
1
BYTE 1: DEVICE ADDRESS
0
WRITE ADDRESS
0
1
1
BYTE 1: DEVICE ADDRESS
1
0
0
WRITE ADDRESS
A1 A0
I
0
2
(MAX11801/MAX11803)
C-Supported Sequence
A
1
i
W
[6:0]
A
0
SCLK
N
DIN
CS
A1 A0
WRITE REGISTER NUMBER
BYTE 2: REG NUMBER = N
N
7
N
N
8
2
W
N
C-compatible,
9
A6
2
N
1
A
C/SPI Interface
N
A5
N
N
2
D
BYTE 2: FIRST REG NUMBER = N
i
[7:0]
A
WRITE REGISTER NUMBER
N
A4
D
3
BYTE 3: REG(N)[7:0] DATA
N
D
A3
D
WRITE DATA
N
4
16
D
A2
N
D
ically a microcontroller) initiates data transfer on the
bus and generates SCL. The I
10010xx; the last 2 bits of the I
configurable through the address inputs A[1:0].
Repeat the register address plus data pairs (byte 2 and
byte 3 in Figures 21, 22, and 23) to perform multiple
register writes. There is no limit to the number of regis-
ters written with a single command. For example, the
I
all required conversion options, and then issue a sepa-
rate I
17
2
5
C master can perform multiple register writes to set up
D
N
D
A1
2
6
N
D
C command to start a conversion process.
D
i+1
A
A0
N
[7:0]
7
Z
WRITE REGISTER NUMBER
BYTE 4: REG NUMBER = Z
A
Z
Wb
Z
8
D
Z
24
D
Z
BYTE 3: REG(N)[7:0] DATA
Z
25
I
D
2
WRITE DATA
Z
C Configuration Register Write
D
Z
D
A
i+2
D
D
[7:0]
(MAX11801/MAX11803)
D
BYTE 5: REG(Z)[7:0] DATA
D
2
2
D
C device address is
C address are user-
WRITE DATA
D
D
D
D
32
D
S
A
D
D
A
STOP
STOP