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參數資料
| 型號： | TSC2302IRGZRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| 封裝： | GREEN, PLASTIC, VQFN-48 |
| 文件頁數： | 30/85頁 |
| 文件大?。?/td> | 1483K |
| 代理商： | TSC2302IRGZRG4 |
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TSC2302
SLAS394 – JULY 2003
Conversion Controlled by TSC2302 Initiated By Host Responding to PENIRQ
This mode is provided for users who want more control over the A/D conversion process. This mode requires
more overhead from the host processor, so it is generally not recommended.
In this mode, the TSC2302 detects when the touch panel is touched and causes the PENIRQ line to go low. The
host recognizes the interrupt request, and then writes to the ADC control register to select one of the touch
screen scan functions (single X-, Y-, or Z-conversions, continuous X/Y or X/Y/Z1/Z2 Conversions). The
conversion process then proceeds as described above, and as outlined in Figure 48 through Figure 52.
The main difference between this mode and the previous mode is that the host, not the TSC2302, decides when
the touch screen scan begins after responding to a PENIRQ. In this mode, the host must either monitor both
PENIRQ and DAV, or wait a minimum time after writing to the A/D converter control register. This wait time can
be calculated from equation Equation 6 in the case of single conversions, or from equations Equation 4 or
Equation 5 in the case of multiple conversions. The nominal conversion times calculated by these equations
should be extended by approximately 12% to account for variation in the internal oscillator frequency.
36
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