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TC818A датащи(PDF) 17 Page - Microchip Technology

номер детали TC818A
подробное описание детали  Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display
PDF  24 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC818A датащи(HTML) 17 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21475B-page 17
TC818A
3.16
External Crystal
The TC818A is designed to operate with a 32,768Hz
crystal. This frequency is internally divided by two to
give a 61.04µsec clock period. One conversion takes
8000 clock periods or 488.3msec (
≈ 2 conversions/
second). Integration time is 1638.5 clock periods or
100msec.
The 32kHz quartz crystal is readily available and
inexpensive. The 32kHz crystal is commonly used in
digital clocks and counters.
Several crystal sources exist. A partial listing is:
• Statek Corporation
512 N. Main
Orange, CA 92668
(714) 639-7810
TWX: 910-593-1355
TELEX: 67-8394
• Fox Electronics
5570 Enterprise Parkway
Fort Myers, FL 33905
(941) 693-0099
Contact manufacturer for full specifications.
FIGURE 3-13:
TYPICAL LCD
CONFIGURATION,
TC818A TRIPLEX
TABLE 3-4:
TYPICAL LCD CONFIGURATION
– +
W
LO
HOLD
-MEM
AC
Ω
k
mVA
AUTO
PAD
BP1
BP2
BP3
PAD
BP1
BP2
BP3
1
—
—
SCALE
19
—
—
BP3
2X0
X1
X2
20
—
BP2
—
3
X5
X4
X3
21
BP1
—
—
4X6
X7
X8
22
—
LOW
A
5
X11
X10X923
—
W
V
6
X12
X13
X14
24
HOLD
k
m
7
X17
X16
X15
25
4B
4C
—
8
X18
X19
X20
26
4A
4G
4D
9
X23
X22
X21
27
4F
4E
—
10
X24
X25
X26
28
3B
3C
3P
11
X29
X28
X27
29
3A
3G
3D
12
X30
X31
X32
30
3F
3E
—
13
X35
X34
X33
31
2B
2C
2P
14
X36
X37
X38
32
2A
2G
2D
15
—
X40
X39
33
2A
2G
2D
16
BPI
—
—
34
1B
1G
1P
17
—
BP2
—
35
Z
-MEM
—
18
—
—
BP3
36
AC
y
AUTO



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