MAX11802EWC+T Maxim Integrated Products, MAX11802EWC+T Datasheet - Page 16

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

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

Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I
The MAX11800–MAX11803 contain standard features
found in a typical resistive touch-screen controller as
well as advanced features found only on Maxim touch-
screen controllers. Standard features included in the
MAX11800–MAX11803 are:
Advanced features found in the MAX11800/MAX11801
include:
Advanced features found in the MAX11802/MAX11803
include:
16
• 4-wire touch-screen interface
• X/Y coordinate measurement
• Touch pressure measurement
• Direct conversion operation—requires direct AP
• Single commands—AP initiates all activity, one
• Ratiometric measurement
• 12-bit SAR ADC
• Single 1.7V to 3.6V supply
• Programmable touch-detect pullup—50kΩ or
• Auto power-down control for low-power operation
• Autonomous conversion operation—minimal AP
• On-chip FIFO—buffers up to 16 consecutive mea-
• Data tagging—records measurement and touch-
• Filtering—reduces noise using straight or median
• Aperture mode—provides spatial filtering
• Combined commands—multiple operations per-
• User-programmable acquisition modes
• Programmable interrupt output drive
• Data tagging—records measurement and touch
involvement
command at a time
100kΩ
involvement
surements
event information
averaging
formed with a single AP command
event information
______________________________________________________________________________________
Detailed Description
2
C/SPI Interface
The MAX11800/MAX11801 operate in one of two top-
level modes: direct conversion mode (DCM) or
autonomous conversion mode (ACM). Direct conver-
sion mode requires the AP to initiate all activity to and
from the MAX11800/MAX11801. DCM is the operating
mode that most standard resistive touch-screen con-
trollers use. ACM allows the MAX11800/MAX11801 to
perform measurements automatically and inform the AP
when they are complete, reducing data transfers on the
serial bus as well as generating fewer interrupt
requests. The MAX11802/MAX11803 operate in DCM
only. DCM requires the AP to initiate all activity to and
from the MAX11802/MAX11803. DCM is the operating
mode that most standard resistive touch-screen con-
trollers use.
Both DCM and ACM support averaging, data tagging,
and combined commands. Certain commands and
operations are only available in DCM, while others are
only available in ACM. See Figures 3a and 3b and
Table 2 for details.
Position measurements determine either the X or Y
coordinates of the point of contact on the panel sensor.
Allow adequate time for the panel to settle when switch-
ing between X and Y measurements. Figure 4 shows
the physical setup of the panel when performing posi-
tion measurements.
The element R
the X and Y planes of the panel sensor. R
not contribute to the error when performing position
measurements. R
required between each valid measurement.
The panel end-to-end resistance in the direction of
measurement determines the power applied across the
panel. The panel dissipates power in the X elements
when performing an X direction measurement and dis-
sipates power in the Y elements when performing a Y
direction measurement.
• Filtering—reduces noise using straight or median
• Combined commands—multiple operations per-
• User-programmable acquisition modes
• Programmable interrupt output drive
averaging
formed with a single AP command
TOUCH
TOUCH
represents the resistance between
Position Measurements
affects the panel settling time
TOUCH
does