MAX11800TEVS+ Maxim Integrated Products, MAX11800TEVS+ Datasheet - Page 28

• Manufacturer Part Number: MAX11800TEVS+
• Description: KIT EVAL TOUCH SCREEN
• Manufacturer: Maxim Integrated Products

Specifications of MAX11800TEVS+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I
Figure 11. Command and Measurement Flow (DCM)
Table 9. Panel Measurement Command Summary
28
0x7Ah
0x7Bh
0x7Ch
0x7Dh
0x70h
0x72h
0x74h
0x76h
0x78h
0x79h
0x7Eh
0x7Fh
HEX
______________________________________________________________________________________
ACCESS
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
N
N
N
N
Z1 MEAS CMD
Z2 MEAS CMD
X MEAS CMD
Y MEAS CMD
Z1 PSU CMD
Z2 PSU CMD
X PSU CMD
Y PSU CMD
LPM
Y
Y
Y
Y
Y
Y
Y
Y
PAIRABLE
N
N
N
N
No
No
No
No
No
No
No
No
No
No
No
No
2
C/SPI Interface
COMMAND LENGTH
8
8
8
8
8
8
8
8
8
8
8
8
by delaying the conversion time or by adding an addi-
tional panel setup time (t
ing configuration register (0x05). The advantage of
using a dedicated panel setup time is that the ADC
does not consume power during this interval. The
required panel setup time is a function of the panel
end-to-end resistance, the capacitance of the panel,
and any board-level components.
When using a measurement command with CONT = 1 in
a direct conversion mode, 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 command 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-
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
tagged
X, Y = combined command measurement
X, Y, Z1 = combined command measurement
X, Y, Z1, Z2 = combined command measurement
AUX = conversion
X = measurement, CONT = 0
X = measurement, CONT = 1
Y = measurement, CONT = 0
Y = measurement, CONT = 1
Z1 = measurement, CONT = 0
Z1 = measurement, CONT = 1
Z2 = measurement, CONT = 0
Z2 = measurement, CONT = 1
accordingly.
Auxiliary Measurement Command
PSU
FUNCTION
) using the panel setup tim-
Combined Commands
The
MAX11800–
DD
as the