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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 7/34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
TABLE 2-1:
PIN FUNCTION TABLE (CONTINUED)
Pin Number Pin Number
(40-PDIP) (44-PQFP)
Symbol
Description
24
20
FREQ/
VOLTS
Voltage or frequency measurement select input. When unconnected, or connected
VOLTS to DGND, the A/D converter function is active. When connected to V DD , the
frequency counter function is active. This pin has an internal 5 μ A pull-down to DGND.
25
21
PKHOLD Peak hold input. When connected to V DD , the converter will only update the display if a
new conversion value is greater than the preceding value. Thus, the peak reading will be
stored and held indefinitely. When unconnected, or connected to DGND, the converter
will operate normally. This pin has an internal 5 μ A pull-down to DGND.
—
22
UR
Under range output. This output will be HIGH when the digital reading is 380 counts or
less.
—
23
OR
Over range output. This output will be HIGH when the analog signal input is greater
than full scale. The LCD will display "OL" when the input is over ranged.
26
27
28
29
30
31
32
33
34
35
36
—
37
38
39
40
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
V SS
COM
C REF +
C REF -
V REF +
V REF -
V IN -
V IN +
V BUFF
C AZ
V INT
EOC/
HOLD
OSC1
OSC2
OSC3
V DD
Negative supply connection. Connect to negative terminal of 9V battery.
Analog circuit ground reference point. Nominally 3.3V below V DD .
Positive connection for reference capacitor.
Negative connection for reference capacitor.
High differential reference input connection.
Low differential reference input connection.
Low analog input signal connection.
High analog input signal connection.
Buffer output. Connect to integration resistor.
Auto-zero capacitor connection.
Integrator output. Connect to integration capacitor.
Bi-directional pin. Pulses low (i.e., from V DD to DGND) at the end of each conversion. If
connected to V DD , conversions will continue, but the display is not updated.
Crystal oscillator (input) connection.
Crystal oscillator (output) connection.
RC oscillator connection.
LCD segment drive for "a," "g," and "d" segments of MSD.
? 2007 Microchip Technology Inc.
DS21476C-page 7
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