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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： | 10/85頁 |
| 文件大小： | 1483K |
| 代理商： | TSC2302IRGZRG4 |
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High Except
When TEMP1,
TEMP2 Activated
Internal
50 kW
VDD
PENIRQ
VDD
TEMP1
TEMP2
TEMP DIODE
Y+ or X+ Drivers on,
or TEMP1, TEMP2
Measurements Activated
Y+
X+
Y–
ON
TSC2302
SLAS394 – JULY 2003
Figure 44. PENIRQ Functional Block Diagram
In modes where the TSC2302 needs to detect if the screen is still touched (for example, when doing a
PENIRQ-initiated X, Y, and Z conversion), the TSC2302 must reconnect the drivers so that the 50-k
resistor is
connected again. Because of the high value of this pullup resistor, any capacitance on the touch screen inputs
cause a long delay time, and may prevent the detection from occurring correctly. To prevent this, the TSC2302
has a circuit which allows any screen capacitance to be precharged through a low-resistance connection to VDD,
so that the pullup resistor doesn’t have to be the only source for the charging current. The time allowed for this
precharge, as well as the time needed to sense if the screen is still touched, can be set in the configuration
control register. All other drivers (X-,Y+, Y-) are off during precharging.
This does point out, however, the need to use the minimum capacitor values possible on the touch screen inputs.
These capacitors may be needed to reduce noise, but too large a value increases the needed precharge and
sense times, as well as panel voltage stabilization time.
In self-controlled modes where the TSC2302 automatically performs conversions when it detects a pen touch, it
is generally not necessary for the host processor to monitor PENIRQ. Instead, the host must monitor DAV, which
goes low when data is available in the appropriate data register, and returns high when all new data has been
read back by the host.
18
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