參數(shù)資料
型號(hào)： TSC2301IPAGRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 35/95頁(yè)
文件大?。?/td> 1322K
代理商： TSC2301IPAGRG4
www.ti.com
t
coordinate +
2.5 ms ) 2 tPVS ) tPRE ) tSNS ) 2NAVG NBITS
1
fconv
) 4.4 ms
(4)
t
coordinate +
4.75 ms ) 3 tPVS ) tPRE ) tSNS ) 4NAVG NBITS
1
fconv
) 4.4 ms
(5)
TSC2301
SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004
If only X and Y coordinates are to be measured, then the conversion process is complete. Figure 51 shows a
flowchart for this process. The time it takes to go through this process depends upon the selected resolution,
internal conversion clock rate, averaging selected, panel voltage stabilization time, and precharge and sense
times.
The time needed to get a complete X/Y coordinate reading can be calculated by:
where:
tcoordinate = time to complete X/Y coordinate reading;
tPVS = panel voltage stabilization time, as given in Table 11;
tPRE = precharge time, as given in Table 18;
tSNS = sense time, as given in Table 19;
NAVG = number of averages, as given in Table 9; for no averaging, NAVG = 1;
NBITS = number of bits of resolution, as given in Table 8;
fconv = A/D converter clock frequency, as given in Table 10.
If the pressure of the touch is also to be measured, the process continues after the X-conversion is complete,
measuring the Z1 and Z2 values, and placing them in the Z1 and Z2 registers. This process is illustrated in
Figure 52. As before, this process time depends upon the settings described above. The time for a complete
X/Y/Z1/Z2 coordinate reading is given by:
40
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