參數(shù)資料
型號(hào): TC818ACBUTR
元件分類(lèi): ADC
英文描述: 1-CH DUAL-SLOPE ADC, PQFP64
封裝: PLASTIC, QFP-64
文件頁(yè)數(shù): 9/24頁(yè)
文件大?。?/td> 528K
代理商: TC818ACBUTR
2005 Microchip Technology Inc.
DS21475C-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 61.04sec 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
2
X0
X1
X2
20
BP2
3
X5
X4
X3
21
BP1
4
X6
X7
X8
22
LOW
A
5
X11
X10
X9
23
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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