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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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TSC2000IPW 数据表(PDF) 31 Page - Texas Instruments |
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TSC2000IPW 数据表(HTML) 31 Page - Texas Instruments |
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31 / 34 page  31 www.ti.com TSC2000 SBAS257 FIGURE 24. AUX1 Measurement Process. FIGURE 25. AUX2 Measurement Process. FIGURE 26. Port Scan Mode. Host Writes A/D Converter Control Register Start Clock Port Scan Done Yes No Is Data Averaging Done Yes No Is Data Averaging Done Store Battery Input 1 in BAT1 Register Power Down A/D Converter Power Up A/D Converter Power Up Reference Convert Battery Input 1 Store Battery Input 2 in BAT2 Register Convert Battery Input 2 Yes No Is Data Averaging Done Yes No Is Data Averaging Done Store Auxiliary Input 1 in AUX1 Register Convert Auxiliary Input 1 Store Auxiliary Input 2 in AUX2 Register Convert Auxiliary Input 2 Issue Data Available Power Down Reference Turn Off Clock Host Writes A/D Converter Control Register Start Clock Auxiliary Input 2 Done Yes No Is Data Averaging Done Store Auxiliary Input 2 in AUX2 Register Power Down A/D Converter Power Up A/D Converter Power Up Reference Convert Auxiliary Input 2 Issue Data Available Power Down Reference Turn Off Clock Host Writes A/D Converter Control Register Start Clock Auxiliary Input 1 Done Yes No Is Data Averaging Done Store Auxiliary Input 1 in AUX1 Register Power Down A/D Converter Power Up A/D Converter Power Up Reference Convert Auxiliary Input 1 Issue Data Available Power Down Reference Turn Off Clock OPERATION—AUXILIARY MEASUREMENT The two auxiliary voltage inputs can be measured in much the same way as the battery inputs, as shown in Figures 24 and 25. Applications might include external temperature sensing, ambient light monitoring for controlling the back- light, or sensing the current drawn from the battery. OPERATION—PORT SCAN If making measurements of all the analog inputs (except the touch screen) is desired on a periodic basis, the Port Scan mode can be used. This mode causes the TSC2000 to sample and convert both battery inputs and both auxiliary inputs. At the end of this cycle, the battery and auxiliary result registers will contain the latest values. Thus, with one write to the TSC2000, the host can cause four different measure- ments to be made. The flowchart for this process is shown in Figure 26. The time needed to make a complete port scan is given by: t 7.5 s + t + 4N N 1 f 4.4 s READING REF AVG BITS CONV =µ + µ • (8) |
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