TC815CBU 查看數據表（PDF） - Microchip Technology
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TC815CBU
Microchip Technology
TC815CBU Datasheet PDF : 26 Pages
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TC815
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 Plastic)
Quad Flat Package
Symbol
Description
1
NC
Logic Input. “0” (Digital Ground) for resistance measurement.
2
OHM
Logic Input. “0” (Digital Ground) for 20mA full scale current measurement.
3
20mA
Audio frequency, 4kHz, output for continuity indication during resistance measurement.
4
BUZ
Audio frequency, 4kHz, output for continuity indication during resistance measurement. A
non-continuous 4kHz signal is output to indicate an input overrange during voltage or
current measurements.
5
XTAL1 32.768kHz Crystal Connection.
6
XTAL2 32.768kHz Crystal Connection.
7
VDISP
Sets peak LCD drive signal: VP - VDD - VDISP. VDISP may also be used to compensate for
temperature variation of LCD crystal threshold voltage.
8
BP1
LCD Backplane #1.
9
BP2
LCD Backplane #2.
10
BP3
LCD Backplane #3.
11
LOΩ/A LCD Annunciator segment drive for low ohms resistance measurement and current
measurement.
12
Ω/V
LCD Annunciator segment drive for resistance measurement and voltage measurement.
13
k/m/HOLD LCD Annunciator segment drive for k (“kilo-ohms”), m (“milliamps” and
“millivolts”) and HOLD mode.
14
BCP0
LCD segment drive for “b,” “c” segments and decimal point of least significant digit (LSD).
(One’s digit)
15
ADG0
LCD segment drive for “a,” “g,” “d” segments of LSD.
16
FE0
LCD segment drive for “f” and “e” segments of LSD.
17
NC
No connection.
18
BCP1
LCD segment drive for “b,” “c” segments and decimal point of 2nd LSD.
19
AGD1
LCD segment drive for “a,” “g,” “d” segments of 2nd LSD (Ten’s digit).
20
FE1
LCD segment drive for “f” and “e” segments of 2nd LSD.
21
BCP2
LCD segment drive for “b,” “c” segments and decimal point of 3rd LSD
(Hundred’s digit).
22
AGD2
LCD segment drive for “a,” “g,” “d” segments of 3rd LSD.
23
FE2
LCD segment drive for “b,” “c” segments and decimal point of 3rd LSD.
24
BCP3
LCD segment drive for “b,” “c” segments and decimal point of MSD
(Thousand’s digit).
25
AC/-/AUTO LCD annunciator drive signal for AC measurements, polarity, and auto-range operation.
26
-MEM/BATT LCD annunciator drive signal for low battery indication and Memory
(Relative Measurement) mode.
27
VSSD
Negative battery supply connection for internal digital circuits. Connect to negative terminal
of battery.
28
VCC
Positive battery supply connection.
29
ANALOG Analog circuit ground reference point. Nominally 2.6V below VCC.
COM
30
RMREFH Ratiometric (Resistance measurement) reference high voltage.
31
RMREFL Ratiometric (Resistance measurement) reference low voltage.
32
CREFL
Reference capacitor negative terminal CREF 0.1µf.
33
CREFH
Reference capacitor positive terminal CREF 0.1µf.
34
REFHI Reference voltage for voltage and current measurement; nominally 163.85mV.
© 2002 Microchip Technology Inc.
DS21474B-page 5
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