MAX11800 Datasheet, PDF (44/56 Pages) Maxim Integrated Products – Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface

Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I²C/SPI Interface
Table 18. Status and Configuration Registers
HEX
00h
01h
02h
R6 R5 R4 R3 R2 R1 R0 ACCESS
0000000
R
0 0 0 0 0 0 1 R/W
0 0 0 0 0 1 0 R/W
PAIRABLE
No
Yes
Yes
AUTOINCREMENT
DATA
LENGTH
FUNCTION
Yes
8
General status
Yes
8
General configuration
Yes
8
Measurement resolution
configuration
03h 0 0 0 0 0 1 1 R/W
Yes
Yes
8
Measurement averaging
configuration
04h 0 0 0 0 1 0 0 R/W
Yes
Yes
8
ADC sample time
configuration
05h 0 0 0 0 1 0 1 R/W
Yes
Yes
8
Panel setup times
configuration
06h 0 0 0 0 1 1 0 R/W
Yes
Yes
8
ADC delay initial conversion
configuration
07h 0 0 0 0 1 1 1 R/W
Yes
Yes
8
Touch-detect pullup times
configuration
08h 0 0 0 1 0 0 0 R/W
Yes
Autonomous mode timing
Yes
8
configuration (MAX11800/
MAX11801)
09h 0 0 0 1 0 0 1 R/W
Yes
0Ah 0 0 0 1 0 1 0 R/W
Yes
0Bh 0 0 0 1 0 1 1 R/W
Yes
Aperture settings (auto)
Yes
8
configuration (MAX11800/
MAX11801)
Yes
8
Auxiliary measurement
configuration
Yes
8
Operating mode
configuration
Data Readback Commands
Autonomous Conversion Mode
Use the readback command 0x50 to read back available
FIFO data in autonomous conversion modes (AUTO = 1)
(MAX11800/MAX11801). The oldest available data is
read out first. Data blocks vary from 32 to 64 bits in
length, depending on the scan mode selected. Reading
back longer than one block results in reading back the
next available block. The end-of-file indicator is read
back when no unread data is available in the FIFO. This
command does not autoincrement and the register
address does not advance beyond 0x50. See the FIFO
Data Block Readback Structure section for more details.
Direct Conversion Mode
Use the readback commands 0x52 to 0x5B to read
back available measurement data gathered in direct
conversion mode (AUTO = 0). Random data access is
supported within this register space and the commands
autoincrement up to register 0x5B. The register
address does not advance beyond register 0x5B.
Attempting to read back a pending conversion results
in data being tagged invalid. See the Direct Conversion
Mode Operations section for more details.
The panel setup and conversion commands are not
pairable in write mode as each command modifies the
panel setting both during and after the command,
based on conversion executions and CONT bit set-
tings. All direct conversion commands modify the
expected I²C read register location to support the data
streamlining protocol. Table 21 shows the resulting
read register settings by command type applicable to
I²C variants.
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