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參數(shù)資料
| 型號(hào)： | TC818ACBU |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| 中文描述： | 自動(dòng)測(cè)距模擬到數(shù)字轉(zhuǎn)換器與數(shù)字顯示3-1/2 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 583K |
| 代理商： | TC818ACBU |
2002 Microchip Technology Inc.
DS21475B-page 5
TC818A
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
(64-Pin PQFP)
Symbol
Description
1
2
3
4
NC
OHM
20mA
BUZ
No connection.
Logic Input. “0” (Digital Ground) for resistance measurement.
Logic Input. “0” (Digital Ground) for 20mA full scale current measurement.
Buzzer. Audio frequency, 4kHz, output for continuity indication during resistance
measurement. A noncontinuous 4kHz signal is output to indicate an input over range
during voltage or current measurements.
32.768kHz Crystal Connection.
32.768kHz Crystal Connection.
Sets peak LCD drive signal: V
P
- V
DD
-V
DISP
. V
DISP
may also be used to compensate for
temperature variation of LCD crystal threshold voltage.
LCD Backplane #1.
LCD Backplane #2.
LCD Backplane #3.
LCD Annunciator segment drive for low ohms resistance measurement and current
measurement.
LCD Annunciator segment drive for resistance measurement and voltage measurement.
LCD Annunciator segment drive for k (“kilo-Ohms”), m (“milliamps” and “millivolts”) and
HOLD mode.
LCD segment drive for “b,” “c” segments and decimal point of least significant digit (LSD).
5
6
7
XTAL1
XTAL2
V
DISP
8
9
10
11
BP1
BP2
BP3
LO
/A
12
13
/V
k/m/HOLD
14
BCP0
(One’s digit)
AGD0
FE0
NC
BCP1
AGD1
FE1
BCP2
15
16
17
18
19
20
21
LCD segment drive for “a,” “g,” “d” segments of LSD.
LCD segment drive for “f” and “e” segments of LSD.
No connection.
LCD segment drive for “b,” “c” segments and decimal point of 2nd LSD.
LCD segment drive for “a,” “g,” “d” segments of 2nd LSD.
LCD segment drive for “f” and “e” segments of 2nd LSD.
LCD segment drive for “b,” “c” segments and decimal point of 3rd LSD
(hundred’s digit).
LCD segment drive for “a,” “g,” “d” segments of 3rd LSD.
LCD segment drive for “f,” “e” segments of 3rd LSD.
LCD segment drive for “b,” “c” segments and decimal point of MSD,
(thousand’s digit).
LCD annunciator segment drive for AC measurements, polarity, and auto-range operation.
LCD annunciator segment drive for AC for low battery indication and memory (relative
measurement).
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.
Positive battery supply connection.
Analog circuit ground reference point. Nominally 3V below V
CC
.
De-integrate output.
Ratiometric (resistance measurement) reference low voltage.
Reference capacitor negative terminal C
REF
= 0.1
μ
f.
Reference capacitor positive terminal C
REF
= 0.1
μ
f.
Reference voltage for voltage and current measurement. Nominally 163.85mV.
Standard resistor connection for 200
full scale.
Standard resistor connection for 2000
full scale.
22
23
24
AGD2
FE2
BCP3
25
26
AC/-/AUTO
-MEM/BATT
27
ANNUNC
28
29
30
31
32
33
34
35
36
V
CC
COM
DEINT
RM
REFL
C
REFL
C
REFH
REFHI
R1
R2
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