MAX11803 Maxim Integrated Products, MAX11803 Datasheet - Page 28

• 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
When using a measurement command with CONT = 1 in
a direct conversion mode, the MAX11800–MAX11803
perform a data tagging operation at the conclusion of the
command. The devices remain in the requested setup
mode in preparation for the succeeding measurement.
The panel does not return to TDM/LPM and the interrupt
status is not modified as a result of a measurement com-
mand with CONT = 1 issued. See Figure 12.
In direct conversion modes, the panel returns to a TDM
at the conclusion of a combined command and all data
are
MAX11803 then idle in a low-power mode determined
by the interrupt mode selected. See Figure 13.
The MAX11800–MAX11803 support measurement of an
auxiliary input using the internal ADC in direct conver-
sion mode only. When programmed, the devices sam-
Table 9. Panel Measurement Command Summary
28
HEX
7xh
7xh
7xh
7xh
7xh
7xh
7xh
7xh
______________________________________________________________________________________
tagged
R7
0
0
0
0
0
0
0
0
R6
1
1
1
1
1
1
1
1
accordingly.
R5
1
1
1
1
1
1
1
1
Auxiliary Measurement Command
R4
1
1
1
1
1
1
1
1
R3
0
0
0
0
1
1
1
1
Combined Commands
R2
The
0
0
1
1
0
0
1
1
R1
0
1
0
1
0
1
0
1
2
MAX11800–
C/SPI Interface
(CONT)
CONT
CONT
CONT
CONT
R0
(0)
(0)
(0)
(0)
ACCESS
Write
Write
Write
Write
Write
Write
Write
Write
ple and quantize the voltage at AUX using V
ADC reference. The MAX11800–MAX11803 store the
result in the same manner as X, Y, Z1, and Z2 measure-
ments, but do not add data tagging. The devices also
support averaging functions. Auxiliary measurements
do not require any panel setup procedure. There is no
combined command which includes an auxiliary mea-
surement. Register 0x0A specifies the configuration for
auxiliary measurements.
In CINT, the MAX11800–MAX11803 continue to monitor
for the touch status of the panel. The devices report any
change in touch status in real time during an auxiliary
measurement procedure.
When performing auxiliary measurements in edge
interrupt mode, the MAX11800–MAX11803 temporarily
suspend the panel touch monitoring. The devices noti-
fy the AP after the completion of the auxiliary measure-
ment when a new touch occurs during the auxiliary
measurement.
PAIRABLE
No
No
No
No
No
No
No
No
COMMAND
LENGTH
8
8
8
8
8
8
8
8
X, Y = combined command
measurement
X, Y, Z1 = combined
command measurement
X, Y, Z1, Z2 = combined
command measurement
AUX = conversion
X = measurement
Y = measurement
Z1 = measurement
Z2 = measurement
FUNCTION
DD
as the