參數(shù)資料
型號： LM93CIMTX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： LJT 6C 6#12 PIN PLUG
中文描述： 16-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO56
封裝： MO-153EE, TSSOP-56
文件頁數(shù)： 14/92頁
文件大?。?/td> 654K
代理商： LM93CIMTX
12.0 Functional Description
(Continued)
Required External Level Shifting
Resistors for 12V Power Input
20068210
The +3.3V standby voltage is used as a reference for the
level shifting. Therefore, the tolerance of this voltage directly
effects the accuracy of the 12V reading. To minimize ratio
errors, a tolerance of better than
±
1% should be used. It is
recommended that the equivalent thevenin resistance of the
divider is between 1k and 7k to minimize errors caused by
leakage currents at extreme temperatures. To calculate the
ratio of R1 to R2 use this equation:
where V
IN
is the nominal input voltage of 12V, V
REF
is the
reference voltage of +3.3V andAD_IN is the voltage required
at the AD input for a
1
4
scale reading or 0.309V.
Therefore, for this case:
Using standard 1% resistor values for R1 of 5.76 k
and R2
of 1.4 k
yields an R1 to R2 ratio of 4.1143.
The input voltage V
IN
can be calculated using the value
register reading (VR) using this equation:
The table below summarizes the theoretical voltage values
for value register readings near 12V.
Value Register
15
16
17
18
19
20
21
22
23
24
25
26
V
IN
%
from 12V
-10.0563
-9.8505
-9.6448
-9.4390
-9.2332
-9.0275
-8.8217
-8.6159
-8.4101
-8.2044
-7.9986
-7.7928
-13.2068
-13.1821
-13.1574
-13.1327
-13.1080
-13.0833
-13.0586
-13.0339
-13.0092
-12.9845
-12.9598
-12.9351
Value Register
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
V
IN
%
from 12V
-7.5871
-7.3813
-7.1755
-6.9698
-6.7640
-6.5582
-6.3524
-6.1467
-5.9409
-5.7351
-5.5294
-5.3236
-5.1178
-4.9121
-4.7063
-4.5005
-4.2947
-4.0890
-3.8832
-3.6774
-3.4717
-3.2659
-3.0601
-2.8544
-2.6486
-2.4428
-2.2370
-2.0313
-1.8255
-1.6197
-1.4140
-1.2082
-1.0024
-0.7967
-0.5909
-0.3851
-0.1793
0.0264
0.2322
0.4380
0.6437
0.8495
1.0553
1.2610
1.4668
1.6726
1.8784
2.0841
2.2899
2.4957
-12.9104
-12.8858
-12.8611
-12.8364
-12.8117
-12.7870
-12.7623
-12.7376
-12.7129
-12.6882
-12.6635
-12.6388
-12.6141
-12.5894
-12.5648
-12.5401
-12.5154
-12.4907
-12.4660
-12.4413
-12.4166
-12.3919
-12.3672
-12.3425
-12.3178
-12.2931
-12.2684
-12.2438
-12.2191
-12.1944
-12.1697
-12.1450
-12.1203
-12.0956
-12.0709
-12.0462
-12.0215
-11.9968
-11.9721
-11.9474
-11.9228
-11.8981
-11.8734
-11.8487
-11.8240
-11.7993
-11.7746
-11.7499
-11.7252
-11.7005
L
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