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MAX11802ETC Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX11802ETC Datasheet(HTML) 7 Page - Maxim Integrated Products |
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7 / 57 page  Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface _______________________________________________________________________________________ 7 TERM DEFINITION FIFO First-In First-Out Memory: The MAX11800–MAX11803 contain a 1024-bit FIFO that is used to store conversion results when operating in autonomous conversion mode. FIFO depth indicates the number of words (16-bit quantity) in the FIFO. Scan Scan: Generally, a single sequence of operations performed in DCM or ACM. The operations could include a panel setup operation, followed by a panel measurement operation, or a combined measurement operation. Scan Block Scan Block: Generally, a sequence of multiple operations performed in DCM or ACM. The operations could include panel-setup operations, panel-measurement operations, or combined measurement operations. Timed Scan Timed Scan: A scan or scan block operation that uses the on-chip oscillator and timer. The timer is controlled through the configuration registers and represents an array of fixed (time) quantities that are user selectable (MAX11800/MAX11801). Untimed Scan Untimed Scan: A scan or scan block operation that is controlled by the AP. This only applies to DCM. TAG Data Tag: Information appended to the end of an ADC conversion result. Tags indicate the type of measurement and touch status associated with each panel observation. See the definitions for ETAG and MTAG (also in Table 1). ETAG Event Tag: Data tags indicating the panel touch status observed during a measurement. MTAG Measurement Tag: Data tag indicating the type of measurement read back by the AP (either X, Y, Z1, or Z2). TIRQ Touch Interrupt Request: Active-low interrupt, indicating that a touch is present (CINT) or has been initiated (EINT) in DCM, or that new data is available in the FIFO in ACM. EINT Edge Interrupt Mode: Indicates, through TIRQ, that a touch has been initiated (EINT) in DCM. The duration that TIRQ is low is user programmable. CINT Continuous Interrupt Mode: Indicates, through TIRQ, that a touch is present (CINT) in DCM. TIRQ goes low to indicate the presence of a touch and stays low until the touch event ceases. CORINT Clear-on-Read Interrupt Mode: Used in ACM only. TIRQ goes low to indicate the presence of new FIFO data. The interrupt is cleared when the data is read by the AP (MAX11800/MAX11801). APER Aperture Mode: Available in ACM only. Reduces data writes to the FIFO by spatially filtering measurement data. CONT Continuous Bit: An option in DCM to return the MAX11800–MAX11803 to a panel setup (wait) mode (PSU) after a conversion, rather than a return to TDM (recommended only for applications with very long panel settling times and request controlling their own averaging). The continuous bit resides in bit 0 (R0) of the PSU and PMC registers. LPM Low-Power Mode: An idle mode used in DCM/EINT or ACM modes, when a touch is detected at the conclusion of the last measurement. This indicates a new measurement needs to be requested or scheduled (the touch-detect pullup is not engaged to save power). PUR Pullup Rough: A fast pullup mode, which uses the main X+ switch in parallel with the on-chip resistive pullup (50k Ω/100kΩ) to quickly slew the touch panel capacitances. RPUR ≤ 10Ω typical. PUF Pullup Fine: A slow (fine) pullup mode, which uses the on-chip resistive pullup to slew the touch-panel capacitances to their final values (RPUF = 50k Ω or 100kΩ) typical and is required for all applications. SAR ADC Successive Approximation Register ADC: An analog-to-digital converter that converts a continuous analog waveform into a discrete digital representation through a binary search through all possible quantization levels before finally converging upon a digital output for each conversion. I2C Inter-Integrated Circuit: A multimaster serial computer bus that is used to attach low-speed peripherals to other components using two bidirectional open-drain lines, serial data (SDA) and serial clock (SCL), pulled up with resistors. SPI Serial Peripheral Interface: A serial interface in which a master device supplies clock pulses to exchange data serially with a slave over two data wires (master-slave and slave-master). Table 1. Terminology (continued) |
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