MAX11800GTC/V+T Maxim Integrated Products, MAX11800GTC/V+T Datasheet - Page 45

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MAX11800GTC/V+T

Manufacturer Part Number
MAX11800GTC/V+T
Description
IC TOUCH SCREEN CTRLR LP 12WQFN
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet

Specifications of MAX11800GTC/V+T

Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Resolution (bits)
12 b
Data Interface
Serial, SPI™
Data Rate/sampling Rate (sps, Bps)
105k
Voltage - Supply
1.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
12-WQFN Exposed Pad
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Figure 30. I
All direct conversion commands automatically set the
readback target register, streamlining data gathering
operations. See the register map for specific details for
all such commands. For example, if the user writes a
command requesting an XY combined measurement,
the MAX11801/MAX11803 automatically set the default
readback register pointer to the XMSB location. Thus, if
the XY command is issued and allowed to complete, it
can then be followed directly by a streamlined read
sequence of the format, as shown in Figure 29, and
newly acquired data is read back, commencing with
the XMSB register.
Note that accepted direct conversion commands
always modify the current internal register location and
effectively override the resumed readback behaviors
and any register settings made in response to previous-
ly completed direct conversion commands. Users wish-
ing to override this behavior can use still use the
standard readback sequences of the format, as shown
in Figures 28 and 29.
If the streamlined readback sequence is issued follow-
ing a configuration write operation, data readback com-
mences from the last written register location. Thus, if
the user modifies the contents of the Operating Mode
Configuration register (0x0B) using a write sequence
and then issues a streamlined readback sequence, the
contents of register 0x0B are provided.
Note that register write operations always modify the
current internal register location and effectively override
the resumed readback behaviors.
Figure 30 shows the required command format for
issuing conversion and measurement requests. A
request cannot be paired with multiple commands or
Low-Power, Ultra-Small Resistive Touch-Screen
Read Operations Following Write Operations
2
Commands (MAX11801/MAX11803)
SDA
C Conversion and Measurement Commands
SCL
I
2
C Conversion and Measurement
START
Direct Conversion Read Operations
______________________________________________________________________________________
1
0
BYTE 1: DEVICE ADDRESS
Controllers with I
WRITE ADDRESS
0
1
0
A1
A0
W
A
instructions. Any command issued while previous com-
mands are being executed is ignored and the read-
back 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
4) I
N6
CONVERSION OR MEASUREMENT COMMAND
• 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 (MAX11800/
• Allows reading FIFO contents when operating in
• Direct conversion mode (MAX11800/MAX11802)
• Allows reading measurement results when in DCM
• Direct conversion mode (MAX11801/MAX11803)
• Allows reading measurement results when in DCM
2
C Readback Registers: 52h to 58h
N5
(panel time constant)
MAX11801)
ACM (MAX11800/MAX11801)
N4
N3
2
N2
C/SPI Interface
Command and Register Map
N1
N0
User-Accessible Registers
X
A
STOP
45

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