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| 型号： | AD7873ARUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT TOUCHSCREEN 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 电阻 |
| 触摸面板接口： | 4 线 |
| 输入数/键： | 1 TSC |
| 分辨率（位）： | 12 b |
| 评估套件： | 可供 |
| 数据接口： | 串行 |
| 数据速率/采样率 (SPS，BPS)： | 125k |
| 电压基准： | 外部，内部 |
| 电源电压： | 2.2 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
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AD7873
Data Sheet
Rev. F | Page 18 of 28
PEN INTERRUPT REQUEST
The pen interrupt equivalent circuitry is outlined in Figure 33.
By connecting a pull-up resistor (10 k to 100 k) between +VCC
and this CMOS logic open-drain output, the PENIRQ output
remains high normally. If PENIRQ is enabled (see Table 8), when
the touch screen connected to the AD7873 is touched by a pen
or finger, the PENIRQ output goes low, initiating an interrupt to
a microprocessor. This can then instruct a control word to be
written to the AD7873 to initiate a conversion. This output can
also be enabled between conversions during power-down (see
Table 8), allowing power-up to be initiated only when the
screen is touched. The result of the first touch screen coordinate
conversion after power-up is valid, assuming any external
reference is settled to the 12-bit or 8-bit level as required.
Figure 34 assumes that the PENIRQ function was enabled in
the last write or that the part was just powered up so PENIRQ is
enabled by default. Once the screen is touched, the PENIRQ
output goes low a time tPEN later. This delay is approximately
5 s, assuming a 10 nF touch screen capacitance, and varies
with the touch screen resistance actually used. Once the START
bit is detected, the pen interrupt function is disabled and
the PENIRQ cannot respond to screen touches. The PENIRQ
output remains low until the fourth falling edge of DCLK after
the START bit is clocked in, at which point it returns high as
soon as possible, irrespective of the touch screen capacitance.
This does not mean that the pen interrupt function is now
enabled again because the power-down bits have not yet been
loaded to the control register. Regardless of whether PENIRQ is
to be enabled again, the PENIRQ output normally always idles
high. Assuming the PENIRQ is enabled again as shown in
Figure 34, then once the conversion is complete, the PENIRQ
output again responds to a screen touch. The fact that PENIRQ
returns high almost immediately after the fourth falling edge of
DCLK means the user avoids any spurious interrupts on the
microprocessor or DSP, which can occur if the interrupt request
line on the micro/DSP were unmasked during or toward the
end of conversion and the PENIRQ pin was still low. Once the
next start bit is detected by the AD7843, the PENIRQ function
is again disabled.
If the control register write operation overlaps with the data
read, a start bit is always detected prior to the end of
conversion, meaning that even if the PENIRQ function is
enabled in the control register, it is disabled by the start bit
again before the end of the conversion is reached, so
the PENIRQ function effectively cannot be used in this mode.
However, as conversions are occurring continuously,
the PENIRQ function is not necessary and is therefore
redundant.
Figure 33. PENIRQ Functional Block Diagram
Figure 34. PENIRQ Timing Diagram
Y+
Y–
ON
X+
TOUCH
SCREEN
EXTERNAL
PULL-UP
PENIRQ
ENABLE
+VCC
PENIRQ
100k
02164-
033
S
A2
A1
A0
1
0
8
1
13
16
MODE
SER/
DFR
SCREEN
TOUCHED
HERE
NO RESPONSE TO TOUCH
tPEN
PENIRQ
CS
DCLK
DIN
(START)
PD1 = 1, PD0 = 0, PENIRQ
ENABLED AGAIN
INTERRUPT
PROCESSOR
02164-
034
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7873ARUZ-REEL7 | 功能描述:IC ADC 12BIT TOUCHSCREEN 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 触摸屏控制器 系列:- 标准包装:96 系列:- 类型:- 触摸面板接口:- 输入数/键:- 分辨率（位）:- 评估套件:* 数据接口:- 数据速率/采样率 (SPS，BPS):- 电压基准:- 电源电压:- 电流 - 电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| AD7873BCP | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Rochester Electronics LLC 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Bulk |
| AD7873BCP-REEL | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
| AD7873BCP-REEL7 | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER 制造商:Analog Devices 功能描述:2.7V 12-BIT TOUCH SCREEN DIGITIZER I.C. - Tape and Reel |
| AD7873BCPZ | 制造商:Analog Devices 功能描述:TOUCH SCREEN DIGITIZER |
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