TC818A Просмотр технического описания (PDF) - Microchip Technology
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TC818A Datasheet PDF : 24 Pages
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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
-MEM
AC
AUTO
– + HOLD
LO W
kΩ
mVA
TABLE 3-4:
PAD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TYPICAL LCD CONFIGURATION
BP1
BP2
BP3
—
—
SCALE
X0
X1
X2
X5
X4
X3
X6
X7
X8
X11
X10
X9
X12
X13
X14
X17
X16
X15
X18
X19
X20
X23
X22
X21
X24
X25
X26
X29
X28
X27
X30
X31
X32
X35
X34
X33
X36
X37
X38
—
X40
X39
BPI
—
—
—
BP2
—
—
—
BP3
PAD
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BP1
—
—
BP1
—
—
HOLD
4B
4A
4F
3B
3A
3F
2B
2A
2A
1B
Z
AC
BP2
—
BP2
—
LOW
W
k
4C
4G
4E
3C
3G
3E
2C
2G
2G
1G
-MEM
y
BP3
BP3
—
—
A
V
m
—
4D
—
3P
3D
—
2P
2D
2D
1P
—
AUTO
© 2002 Microchip Technology Inc.
DS21475B-page 17
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