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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TSC2004 Fiches technique(PDF) 36 Page - Burr-Brown (TI) |
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TSC2004 Fiches technique(HTML) 36 Page - Burr-Brown (TI) |
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36 / 54 page  www.ti.com TSC2004 SBAS408A – JUNE 2007 – REVISED AUGUST 2007 BTD2-BTD0—Batch Time Delay mode. These are the selection bits that specify the delay before a sample/conversion scan cycle is triggered. When it is set, Batch Time Delay mode uses a set of timers to automatically trigger a sequence of sample-and-conversion events. The mode works for both TSC-initiated scans (XYZ or XY) and host-initiated scans (XYZ or XY). A TSC-initiated scan (XYZ or XY) can be configured by setting the PSM bit in CFR0 to '1' and C[3:0] in Control Byte 1 to '0000' or '0001'. In the case of a TSC-initiated scan (XYZ or XY), the sequence begins with the TSC responding to a pen touch. After the first processed sample set completes during the batch delay, the scan enters a wait mode until the end of the batch delay is reached. If a pen touch is still detected at that moment, the scan continues to process the next sample set, and the batch delay is resumed. The throughput of the processed sample sets (shown in Table 21 as sample sets per second, or SSPS) is regulated by the selected batch delay during the time of the detected pen touch. A TSC-initiated scan (XYZ or XY) can be configured by setting the PSM bit in CFR0 to '1' and C[3:0] in Control Byte 1 to '0000' or '0001'. Note that the throughput of the processed sample set also depends on the settings of stabilization, precharge, and sense times, and the total number of samples to be processed per coordinates. If the accrual time of these factors exceeds the batch delay time, the accrual time dominates. Batch delay time starts when the pen touch initiates the scan function that converts coordinates. A host-initiated scan (XYZ or XY) can be configured by setting the PSM bit in CFR0 to '0' and C[3:0] in Control Byte 1 to '0000' or '0001'. For the host-initiated scan (XYZ or XY), the host must set TSC internal register C[3:0] in Control Byte 1 to '0000' or '0001' initially after a pen touch is detected; see Conversion Controlled by TSC2004 Initiated by Host (TSMode 2), in the Theory of Operation section. After the scan (XYZ or XY) is engaged, the throughput of the processed sample sets is regulated by the selected batch delay timer, as long as the initial detected touch is not interrupted. Table 21. Touch Screen Throughput and Batch Selection Bits BATCH DELAY SELECTION THROUGHPUT FOR TSC-INITIATED DELAY TIME OR HOST-INITIATED SCAN, XYZ OR XY BTD2 BTD1 BTD0 (ms) (SSPS) 0 0 0 0 Normal operation throughput depends on settings. 0 0 1 1 1000 0 1 0 2 500 0 1 1 4 250 1 0 0 10 100 1 0 1 20 50 1 1 0 40 25 1 1 1 100 10 For example, if stabilization time, precharge time, and sense time are selected as 100 μs, 84μs, and 96μs, respectively, and the batch delay time is 2ms, then the scan function enters wait mode after the first processed sample set until the 2ms of batch delay time is reached. When the scan function starts to process the second sample set (if the screen is still touched), the batch delay restarts at 2ms (in this example). This procedure remains regulated by 2ms until the pen touch is not detected or the scan function is stopped by a stop bit or any reset form. 36 Submit Documentation Feedback |
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