MAX11803 Maxim Integrated Products, MAX11803 Datasheet - Page 42

• 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
In direct conversion mode, commands automatically
set the readback target register and streamline data
gathering. See the Command and Register Maps sec-
tion for specific details for all such commands. The
MAX11801/MAX11803 automatically set the default
readback register to the XMSB location when a com-
mand requesting is received and a XY combined mea-
surement is received. If the XY command is issued and
allowed to complete, the device can then be followed
directly by a streamlined read sequence and data
readback commences from the XMSB register.
Accepted direct conversion commands always modify
the current internal register location and effectively
override the resumed readback behaviors and any reg-
ister settings made in response to previously complet-
ed direct conversion commands.
Data readback commences from the last written register
location when the streamlined readback sequence is
issued following a configuration write operation. When
modifying the contents of the operating mode configura-
tion register (0x0B) using a write sequence, then issuing
a streamlined readback sequence, the contents of regis-
ter 0x0B are provided. Register write operations always
modify the current internal register location and effectively
override the resumed readback behaviors.
Figure 26 shows the required command format for issu-
ing conversion requests. A conversion request cannot
be paired with multiple commands or instructions. Any
conversion command issued while previous commands
Figure 26. I
42
• Direct Conversion Read Operations (MAX11801/
• Read Operations Following Write Operations
I
2
MAX11803)
(MAX11801/MAX11803)
C Conversion Command (MAX11801/MAX11803)
______________________________________________________________________________________
2
SDA
SCL
C Conversion Command
START
1
0
BYTE 1: DEVICE ADDRESS
WRITE ADDRESS
0
1
2
0
C/SPI Interface
A1
A0
W
A
are being executed is ignored and the readback target
register is not modified.
The command map consists of the user-configuration reg-
isters (read/write), TSC data readback commands (read
only), and TSC panel setup and conversion commands
(write only).
There are six blocks of user-accessible registers and
commands that control all operations of the
MAX11800–MAX11803. The register blocks and com-
mands consist of the following:
1) Status and Configuration Registers: 00h to 0Bh
2) FIFO Data Readback Command: 50h
3) Data Readback Commands: 52h to 5Bh
N
• Sets modes of operation––ACM or DCM
• Settings to accommodate various panel sizes
• Averaging and noise settings
• Measurement resolution
• Auxiliary settings
• General part status reporting
• Autonomous conversion mode only (MAX11800/
• Allows reading FIFO contents when operating in
• Direct conversion mode only (MAX11800/
• Allows reading measurement results when in DCM
N
(panel time constant)
MAX11801)
ACM
MAX11802)
CONVERSION COMMAND
N
N
N
Command and Register Map
N
N
User-Accessible Registers
N
A
STOP