MAX11800 datasheet(6/57 Pages) MAXIM

Part #	MAX11800

Description	Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Power, Ultra-Small Resistive Touch-Screen

Controllers with I2C/SPI Interface

6

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TERM

DEFINITION

Panel,

Touch Screen,

Touch Panel

Resistive Touch Sensor: Panel, or touch screen, or touch panel are used interchangeably to denote the

resistive touch sensor.

TSC

Touch-Screen Controller: Devices attached to a touch screen that provide the interface between an

application processor (AP) and touch screen.

X+

X Position Positive I/O: Analog I/O from resistive touch screen. See Figure 4 for configuration and

measurement details.

X-

X Position Negative I/O: Analog I/O from resistive touch screen. See Figure 4 for configuration and

measurement details.

Y+

Y Position Positive I/O: Analog I/O from resistive touch screen. See Figure 4 for configuration and measurement

details.

Y-

Y Position Negative I/O: Analog I/O from resistive touch screen. See Figure 4 for configuration and

measurement details.

RTOUCH

Touch Resistance: Represents the resistance between the X and Y planes of a resistive touch screen during a

touch event.

Z1

Z1 Measurement: A resistive touch-screen measurement to determine the resistance between the two planes

within the panel sensor during a touch event (RTOUCH). See Figure 5 for configuration and measurement details.

Z2

Z2 Measurement: A resistive touch-screen measurement to determine the resistance between the two planes

within the panel sensor during a touch event (RTOUCH). See Figure 5 for configuration and measurement details.

AUX

Auxiliary Input: Analog input to the MAX11800–MAX11803 that can be used to monitor external conditions

such as battery voltage or temperature.

ADC

Analog-to-Digital Converter: Circuit used to transform analog information into a form suitable for digital operations.

AP

Application Processor: An external microcontroller or microprocessor that interfaces to and controls the

general operation of the MAX11800–MAX11803.

AVG

Averaging Mode: The ability to average consecutive measurement results to reduce noise from switch

bounce, power-supply ripple, and incomplete settling.

MAF

Median Averaging Filter: The MAF first removes the minimum and maximum samples before taking the

average of the remaining sample set.

SAF

Straight Averaging Filter: The SAF takes the average of an entire sample set.

TDM

Touch-Detect Mode: An untimed mode that monitors the panel for a touch using a user-selectable panel

pullup resistor of either 50k

or 100k .

DCM

Direct Conversion Mode: A mode of operation in which the AP requests individual panel setup and

conversion operations or automated combinations of measurements (X and Y, X and Y and Z1, or X and Y and

Z1 and Z2). The AP maintains control over the initiation of panel setup, measurements, and the sampling

f

ACM

Autonomous Conversion Mode: A mode of operation in which the MAX11800/MAX11801 idle in TDM until a

touch event occurs. After a touch is detected, the MAX11800/MAX11801 begin an automated sequence of

measurements determined by the user configuration registers.

PSU

Panel Setup Command: User-programmable modes for the purpose of allowing the panel sufficient time to

settle, prior to the start of measurements. PSU commands configure the on-chip multiplexer in preparation to

perform either X, Y, Z1, or Z2 measurements. Durations can either be specified and managed by the

MAX11800–MAX11803 (in ACM and DCM) or managed by the AP (in DCM).

PMC

Panel Measurement Command: Individual measurements of X or Y position and Z1 or Z2 pressure measurements.

CMC

Combined Measurement Command: Combinations of PMCs (X and Y, X and Y and Z1, or X and Y and Z1 and

Z2) offered by the MAX11800–MAX11803 and executed in series to reduce AP bus and interrupt activity.

Table 1. Terminology

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