MAX11802EWC+T Maxim Integrated Products, MAX11802EWC+T Datasheet - Page 19

IC TOUCH SCREEN CTLR 12-WLP

MAX11802EWC+T

Manufacturer Part Number
MAX11802EWC+T
Description
IC TOUCH SCREEN CTLR 12-WLP
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet

Specifications of MAX11802EWC+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 ~ 85°C
Mounting Type
Surface Mount
Package / Case
12-WLP
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Resolution
11 bits
Interface Type
I2C, SPI
Supply Voltage (max)
3.6 V
Supply Voltage (min)
1.7 V
Conversion Rate
34.4 KSPs
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX11802EWC+T
MAX11802EWC+TTR
Z1 and Z2 measurements determine the resistance
between the two planes within the panel sensor during
a touch (R
properties of the panel, one of two equations extract the
value of R
sure and area of the touch applied to the panel. Allow
adequate time for the panel to settle when switching
between position and pressure measurements. Figure 5
shows the physical setup of the panel when performing
pressure measurements.
Z1 and Z2 measurements allow observation of the volt-
age on either side of the effective R
With both Z1 and Z2 measurements available, compute
R
Figure 4. Position Measurements
Table 2. Operating Modes, Conditions, and Options
1
2
3
Low-Power, Ultra-Small Resistive Touch-Screen
OPERATION
MAX11800–
In ACM, the choices are limited to X and Y scan, or X and Y and Z1 scan, or X and Y and Z1 and Z2 scan.
In DCM, MTAG is always used. For DCM with CONT = 0, the following ETAGs are used: 00 = touch present (data valid), 10 = no
A separate configuration register for delay time, sampling time, averaging, and ADC resolution settings configures the AUX input.
MAX11800/
TOUCH
MAX11803
MAX11801
touch present (data may be invalid), 11 = measurement in progress (data invalid). For DCM with CONT = 1, the panel cannot be
scanned for a touch because panel setup switches are configured in a measurement mode; therefore, ETAG = 00 is used if a mea-
surement is not in progress, or ETAG = 11 if a measurement is in progress.
PANEL
MODE
X-
DCM
ACM
AUX
X POSITION MEASUREMENT
as follows:
TOUCH
TOUCH
R
TOUCH
PSU PMC CMC TDM LPM AVG FIFO APER
Yes
Yes
No
, providing information about the pres-
1
). Depending on the known physical
______________________________________________________________________________________
X+
V
DD
Yes
Yes
Yes
Y+
Y-
1
3
Pressure Measurements
ADC
INPUT
Yes
Yes
No
PANEL
1
X-
Y POSITION MEASUREMENT
Yes
Yes
No
Controllers with I
TOUCH
R
Yes
TOUCH
No
INPUT
resistance.
ADC
Yes
Yes
Yes
X+
3
Y+
Y-
Yes
No
No
V
DD
Yes
No
No
If only a Z1 measurement is available, compute
R
The power applied across the panel during pressure
measurements is greatly dependent on R
the physical position of the touch. The maximum power
dissipation in the panel during a pressure measurement
is approximately P
Figure 5. Pressure Measurements
R
TOUCH
TOUCH
PANEL
PUR
PUF
Yes
Yes
No
X-
Z1 PRESSURE MEASUREMENT
R
TOUCH
=
⎝ ⎜
as follows:
CONT MTAG ETAG
R
Yes
No
No
XPLATE POSITION
R
TOUCH
=
2
N BITX
INPUT
2
X
R
ADC
Yes
Yes
No
XPLATE
X+
C/SPI Interface
Z
2
= V
Y+
Y-
⎠ ⎟
Yes
Yes
No
⎝ ⎜
V
DD
DD
2
N BI
X
2
Z
2
POSITION
1
PANEL
2
T T Z
/R
N BITX
X-
Z2 PRESSURE MEASUREMENT
Z1, Z2
X, Y,
TOUCH
Yes
Yes
No
1
⎠ ⎟
R
YPLATE
EINT CINT
R
Yes
. This maximum
No
No
TOUCH
Z
Z
2
⎝ ⎜
1
1
TOUCH
Yes
X+
No
No
Y
1
POSITION
2
N BIT
Y+
Y-
COR
ADC
INPUT
INT
Yes
Y Y
No
No
and
V
DD
19
⎠ ⎟

Related parts for MAX11802EWC+T