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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 21/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 3/4DGT LGC PROBE 40DIP |
| 标准包装： | 10 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.75 位数字 |
| 电流 - 电源： | 1mA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
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TC820
+9V
segments to the backplanes and segment drive lines.
1M Ω
R1
V H
TC820
1N4148
V DD
LOGIC
DP1/HI
The backplane drive frequency is obtained by dividing
the oscillator frequency by 240.
Backplane waveforms are shown in Figure 5-13 . These
appear on outputs BP1, BP2, and BP3. They remain the
same, regardless of the segments being driven.
R2
Logic
Probe Input
V L
1N4148
DP0/LO
BP1
1M Ω
R3
DGND
BP2
Note: Select R1, R2, R3 for desired logic thresholds.
BP3
FIGURE 5-11:
Window Comparator Logic
Probe.
FIGURE 5-13:
Backplane Waveforms.
Other display output lines have waveforms that vary
5.11
External Peak Detection
depending on the displays values. Figure 5-13 shows a
The TC820 will hold the highest A/D conversion or
frequency reading indefinitely when the PKHOLD input
set of waveforms for the a, g, d outputs of one digit for
several combinations of "on" segments.
is connected to V DD . However, the analog peak input
must be present during the A/D converter's signal
integrate period. For slowly changing signals, such as
temperature, the peak reading will be properly
converted and held.
If rapidly changing analog signals must be held, an
external peak detector should be added. An inexpensive
circuit can be made from an op amp and a few discrete
components, as shown in Figure 5-12 . The droop rate of
the external peak detector should be adjusted so that the
held voltage will not decay below the desired accuracy
level during the converter's 400 ms conversion time.
Segment
Line
All OFF
a Segment
ON
d, g OFF
a, g ON
V DD
V H
V L
V DISP
V DD
V H
V L
V DISP
V DD
V H
+9V
d OFF
V L
V DISP
10k Ω
V DD
V DD
V H
PKHOLD
All ON
V L
V DISP
V IN
TL061
1N4148
0.01μF
TC820
V IN +
FIGURE 5-14:
Waveforms.
Typical Display Output
Offset Null
V SS
0V
FIGURE 5-12:
External Peak Detector.
5.12
Liquid Crystal Display (LCD)
The TC820 drives a triplex (multiplexed 3:1) LCD with
three backplanes. The LCD can include decimal points,
polarity sign, and annunciators for over range, peak
hold, high and low logic levels, and low battery.
? 2007 Microchip Technology Inc.
DS21476C-page 21
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