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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 6/34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
2.0
PIN DESCRIPTIONS
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number Pin Number
(40-PDIP) (44-PQFP)
Symbol
Description
1
40
L-E4
LCD segment driver for L ("logic LOW"), polarity, and "e" segment of most significant digit
(MSD).
2
3
4
5
6
7
8
9
10
11
12
13
14
15
—
41
42
43
44
1
2
3
4
5
6
7
8
9
10
11
AGD4
BC4P3
HFE3
AGD3
BC3P2
OFE2
AGD2
BC2P1
PKFE1
AGD1
BC1BT
BP3
BP2
BP1
V DISP
LCD segment drive for "a," "g," and "d" segments of MSD.
LCD segment drive for "b" and "c" segments of MSD and decimal point 3.
LCD segment drive for H ("logic HIGH"), and "f" and "e" segments of third LSD.
LCD segment drive for "a," "g," and "d" segments of third LSD.
LCD segment drive for "b" and "c" segments of third LSD and decimal point 2.
LCD segment drive for "over range," and "f" and "e" segments of second LSD.
LCD segment drive for "a," "g," and "d" segments of second LSD.
LCD segment drive for "b " and "c" segments of second LSD and decimal point 1.
LCD segment drive for "hold peak reading," and "f" and "e" segments of LSD.
LCD segment drive for "a," "g," and "d" segments of LSD.
LCD segment drive for "b" and "c" segments of LSD and "low battery."
LCD backplane #3.
LCD backplane #2.
LCD backplane #1.
Sets peak LCD drive signal: V PEAK = (V DD ) – V DISP . V DISP may also be used to
compensate for temperature variation of LCD crystal threshold voltage.
16
12
DGND
Internal logic digital ground, the logic "0" level. Nominally 4.7V below V DD .
17
13
ANNUNC Square-wave output at the backplane frequency, synchronized to BP1. ANNUNC can be
used to control display annunciators. Connecting an LCD segment to ANNUNC turns it
on; connecting it to its backplane turns it off.
18
14
LOGIC
Logic mode control input. When connected to V DD , the converter is in Logic mode. The
LCD displays "OL" and the decimal point inputs control the HIGH and LOW annunciators.
When the "low" annunciator is on, the buzzer will also be on. When unconnected or
connected to DGND, the is in the Voltage/Frequency Measurement mode. This pin has a
5 μA internal pull-down to DGND.
19
20
15
16
RANGE/
FREQ
DP0/LO
Dual purpose input. In Range mode, when connected to V DD , the integration time
will be 200 counts instead of 2000 counts.
Dual purpose input. Decimal point select input for voltage measurements. In logic mode,
connecting this pin to V DD will turn on the "low" LCD segment. There is an internal 5 μA
pull-down to DGND in Volts mode only. Decimal point logic:
DP1
0
0
1
1
DPQ
0
1
0
1
Decimal Point Selected
None
DP1
DP2
DP3
21
17
DP1/HI
Dual purpose input. Decimal point select input for voltage measurements. In Logic mode,
connecting this pin to V DD will turn on the "high" LCD segment. There is an internal 5 μ A
pull-down to DGND in Volts mode only.
22
18
BUZOUT Buzzer output. Audio frequency, 5kHz, output which drives a piezoelectric buzzer.
23
19
BUZIN
Buzzer control input. Connecting BUZIN to V DD turns the buzzer on. BUZIN is logically
OR’ed (internally) with the "logic level low" input. There is an internal 5 μ A pull-down to
DGND.
DS21476C-page 6
? 2007 Microchip Technology Inc.
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