TC820CKW データシートの表示（PDF） - TelCom Semiconductor Inc => Microchip
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TC820CKW
TelCom Semiconductor Inc => Microchip
TC820CKW Datasheet PDF : 22 Pages
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TC820
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
ELECTRICAL CHARACTERISTICS (Cont.)
Symbol
VIL
VIH
VOL
VOL
Parameter
Buzzer Frequency
Counter Timebase Period
Low Battery Flag Voltage
Input Low Voltage
Input High Voltage
Output Low Voltage,
UR, OR Outputs
Output High Voltage,
UR, OR Outputs
Control Pin
Pull-Down Current
Test Conditions
fOSC = 40kHz
fOSC = 40kHz
VDD to VSS
IL = 50µA
IL = 50µA
VIN = VDD
Min
Typ
Max
Units
—
5
—
kHz
—
1
—
Second
6.7
7
7.3
V
—
—
DGND + 1.5
V
VDD – 1.5
—
—
V
—
—
DGND + 0.4
V
VDD – 1.5
—
—
V
—
5
—
µA
PIN DESCRIPTION
Pin No.
(40-Pin
Package)
1
Pin No.
(44-Pin Flat
Package)
40
Symbol
L-E4
2
41
AGD4
3
42
BC4P3
4
43
HFE3
5
44
AGD3
6
1
BC3P2
7
2
OFE2
8
3
AGD2
9
4
BC2P1
10
5
PKFE1
11
6
AGD1
12
7
BC1BT
13
8
BP3
14
9
BP2
15
10
BP1
—
11
VDISP
16
12
DGND
17
13
ANNUNC
18
14
LOGIC
19
15
RANGE/
FREQ
3-152
Description
LCD segment driver for L ("logic LOW"), polarity, and "e" segment of most
significant digit (MSD).
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 "overrange," 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: VPEAK = (VDD ) –VDISP. VDISP may also be used to
compensate for temperature variation of LCD crystal threshold voltage.
Internal logic digital ground, the logic "0" level. Nominally 4.7V below VDD.
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.
Logic mode control input. When connected to VDD, 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 TC820 is in the voltage/frequency
measurement mode. This pin has a 5µA internal pull-down to DGND.
Dual-purpose input. In range mode, when connected to VDD, the integration time
will be 200 counts instead of 2000 counts and the LCD will display the analog input
divided by 10. (See text for limitation with TC820.) In frequency mode, this pin is the
frequency input. A digital signal applied to this pin will be measured with a 1-second
time base. There is an internal 5µA pull-down to DGND.
TELCOM SEMICONDUCTOR, INC.
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