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MAX11800 Datasheet(PDF) 24 Page - Maxim Integrated Products |
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MAX11800 Datasheet(HTML) 24 Page - Maxim Integrated Products |
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24 / 57 page  Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface 24 ______________________________________________________________________________________ Z1 ACQUIRE Z2 ACQUIRE TOUCH DETECT TOUCH- DETECT FINE PULLUP TOUCH- DETECT FINE PULLUP TIME IS UP SETUP X PANEL Y ACQUIRE X DETECT AUX ACQUIRE AVERAGE CONVERSION LAST CONVERSION TIME IS UP DONE AND CONTINUOUS DONE AND CONTINUOUS AVERAGE CONVERSION LAST CONVERSION NO COMMAND NO COMMAND NO COMMAND USER COMMAND INTERNAL TRANSITION SETUP Y PANEL SETUP Z PANEL Figure 8. State Machine Transitions (Direct Conversion Mode) Panel Setup, Measurement, and Scan Commands To simplify measurement procedures, the MAX11800– MAX11803 support three types of commands: panel setup commands (PSU), panel measurement commands (PMC), and combined measurement commands (CMC). In direct conversion mode, the MAX11800–MAX11803 can use all three types of commands. Using individual panel setup and measurement commands allow for a high degree of customization based on decisions made by the AP, while using combined commands signifi- cantly simplifies the complete measurement process and reduces communications between the AP and the MAX11800–MAX11803. In autonomous mode, the MAX11800–MAX11803 use combined commands to control and automate all aspects of panel setup, measurements, and timing. See the Operating Mode Configuration Register (0x0B) sec- tion for more details. Direct Conversion Mode Operations In direct conversion mode, 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 combined). Unlike autonomous conversion modes, the AP maintains control over the initiation of panel setup, measurements events, and the sampling frequency. Figure 8 shows the state machine transitions for direct conversion mode. Interrupt Modes The MAX11800–MAX11803 support two direct conver- sion interrupt modes. The two direct conversion modes are the continuous interrupt mode (CINT) and the edge interrupt mode (EINT). Continuous Interrupt Mode In continuous interrupt mode, the panel returns to TDM and idle. The current status of the panel is then sent through TIRQ. The continuous interrupt mode is the least efficient mode in current consumption for long duration of touches. The power consumption is approxi- mated by PTOUCH = VDD2/RPU. The power consump- tion levels observed when the panel is not touched is limited by the junction leakage currents of the MAX11800–MAX11803. |
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Similar Description - MAX11800 |
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