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MAX11800ETC+ Datasheet(PDF) 23 Page - Maxim Integrated Products |
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MAX11800ETC+ Datasheet(HTML) 23 Page - Maxim Integrated Products |
23 / 59 page Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface ______________________________________________________________________________________ 23 Combined Commands Combined commands reduce AP interaction with the MAX11800–MAX11803 by allowing multiple measure- ments. For example, the MAX11800–MAX11803 can be instructed to provide X and Y data, or X and Y and Z1 data, or X and Y and Z1 and Z2 data using a single command. Data Tagging In direct conversion modes, all measurement data is contained in a 16-bit word. X, Y, Z1, and Z2 information is stored independently. Each word consists of 12 bits of measurement data plus a 2-bit measurement type (MTAG) and a 2-bit event tag (ETAG). The measure- ment tag identifies whether the data represents an X, Y, Z1, or Z2 result. The event tag indicates the point at which the data is sampled (initial, midpress, or release) during the touch event. When trying to read a result that is pending, the entire data stream is read back as FFFFh and the event tag as 11b, indicating that the cor- responding measurement is in progress and that the data stream is to be ignored. For combined commands, all data locations requested by the command are marked FFFFh, pending the completion of the entire command and the proper tagging of the data. See Table 5. Direct conversion modes do not use the internal FIFO or support the aperture function (see the Aperture Modes and Options section). Each measurement type uses a single location in the (16-bit) memory. The AP must retrieve the data from the last requested measure- ment before moving on to the next measurement of the type. Auxiliary measurement data is not tagged because it is not related to panel operation. Auxiliary measurement data is stored and read back identically to the other direct conversion data. The tag locations for auxiliary measurement data are always set to 0000b, unless the read occurs when an auxiliary measurement is in progress. In this situation, the tag locations read 1111b and the data stream reads back FFFFh. Low-Power Modes There are also two low-power modes, LPM and TDM. LPM only applies when in DCM with edge interrupt mode or ACM during periods following a conversion where the panel was observed to be touched and a subsequent panel measurement is required and/or scheduled. During LPM, all circuitry is off, including the on-chip touch-detect pullup resistors used in the touch-detect circuitry. In direct conversion modes, a user-request ini- tiates the next operation and all circuitry is off until a user-command is received. Therefore, the current con- sumption is primarily due to junction leakage. In autonomous conversion mode, an on-chip oscillator and timer are constantly running. Therefore, the device current consumption is primarily determined by the oscillator and timer. During TDM, all circuitry is off except the on-chip pullup resistor. This is an untimed mode (oscillator and timer are off) for both ACM and DCM (no digital current). This mode only consumes current through the on-chip pullup resistor when a touch is present. The device can be powered down through register 0x0B when no panel input is expected or needed, and, therefore, no power is consumed through the panel. INDEX 15 14 13 12 11 10 9 8 7 65 4321 0 Byte MSB Byte LSB Byte 12-Bit Content Position MSBs Position LSBs Measure Event 8-Bit Content Position Data Trailing Zeros* Measure Event Table 5. Data Word Structure (All Direct Conversion Modes) AVERAGING MODE NUMBER OF SAMPLES TAKEN NUMBER OF HIGH SAMPLES REMOVED NUMBER OF LOW SAMPLES REMOVED NUMBER OF REMAINING SAMPLES AVERAGED 14 11 2 28 22 4 316 4 4 8 Table 4. Median Averaging Operations * When using averaging with 8-bit conversions, these positions may be filled with fractional data due to averaging operations. |
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