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MAX11800 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX11800 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 57 page Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface 6 _______________________________________________________________________________________ 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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