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TSC2004 Fiches technique(PDF) 44 Page - Burr-Brown (TI) |
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TSC2004 Fiches technique(HTML) 44 Page - Burr-Brown (TI) |
44 / 54 page www.ti.com Conversion Controlled by TSC2004 Initiated by Host (TSMode 2) t COORDINATE + OH1 f OSC )2 @ tPVS)tPRE)tSNS) OH DLY1 f OSC )2 @ N @ (B)2) @ f OSC f ADC )OHCONV @ 1 f OSC ) L PPRO f OSC (7) Detecting Touch PINTDAV Programmed: As , CFR2,D[15:14]=10 PENIRQ As , CFR2,D[15:14]=11or01 DAV As and , CFR2,D[15:14]=00 PENIRQ DAV Programmed for Host- Controlled Mode (PSM=0) TSC Not Addressed P ogra r mm d for X-Y ScanMode e Reading X-Data Register WaitingforHostto WriteInto ControlByte1D[6:3] Sample,Conversion, andPreprocessingfor YCoordinate TouchisStillHere Reading Y-Data Register TSC NotAddressed TSC NotAddressed Detecting Touch TouchisDetected TouchisDetected Sample,Conversion, andPreprocessingfor XCoordinate Detecting Touch t COORDINATE Detecting Touch Sample,Conversion, andPreprocessingfor YCoordinate TSC2004 SBAS408A – JUNE 2007 – REVISED AUGUST 2007 In TSMode 2, the TSC2004 detects when the touch panel is touched and causes the internal Pen-Touch signal to activate, which lowers the PINTDAV output if it is programmed as PENIRQ. The host recognizes the interrupt request, and then writes to the A/D Converter Control register to select one of the two touch screen scan functions: 1. X-Y-Z Scan (converter function select bits C[3:0] = Control Byte 1 D[6:3] = 0000); or 2. X-Y Scan (converter function select bits C[3:0] = Control Byte 1 D[6:3] = 0001). See Table 7 for more information on the converter function select bits. The conversion process then proceeds as shown in Figure 39; see the previous sections for more deatils. The main difference between this mode and the previous mode is that the host, not the TSC2004, decides when the touch screen scan begins. The time needed to convert both X and Y coordinates under host control (not including the time needed to send the command over the I2C bus) is given by: Figure 39. Example of an X and Y Coordinate Touch Screen Scan using TSMode 2 44 Submit Documentation Feedback |
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