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ADM1025A Datasheet(PDF) 12 Page - ON Semiconductor

Part No. ADM1025A
Description  Low Cost PC Hardware Monitor ASIC
Download  21 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADM1025A Datasheet(HTML) 12 Page - ON Semiconductor

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ADM1025/ADM1025A
Preliminary Technical Data
Rev. P5 | Page 12 of 21| www.onsemi.com
INPUT CIRCUITS
The internal structure for the analog inputs is shown in
Figure 14. Each input circuit consists of an input protection
diode, an attenuator, plus a capacitor to form a first order low-
pass filter that gives the input immunity to high frequency
noise.
Figure 14. Structure of Analog Inputs
Table 5. A/D Output Code vs. VIN
Input Voltage
A/D Output
12 VIN
5 VIN
VCC/3.3 VIN
2.5 VIN
VCCPIN
Decimal
Binary
<0.062
<0.026
<0.0172
<0.013
<0.012
0
0000 0000
0.062−0.125
0.026–0.052
0.017–0.034
0.013–0.026
0.012–0.023
1
0000 0001
0.125–0.188
0.052−0.078
0.034−0.052
0.026−0.039
0.023−0.035
2
0000 0010
0.188−0.250
0.078−0.104
0.052−0.069
0.039−0.052
0.035−0.047
3
0000 0011
0.250−0.313
0.104−0.130
0.069−0.086
0.052−0.065
0.047−0.058
4
0000 0100
0.313−0.375
0.130−0.156
0.086−0.103
0.065−0.078
0.058−0.070
5
0000 0101
0.375−0.438
0.156−0.182
0.103−0.120
0.078−0.091
0.070−0.082
6
0000 0110
0.438−0.500
0.182−0.208
0.120−0.138
0.091−0.104
0.082−0.093
7
0000 0111
0.500−0.563
0.208−0.234
0.138−0.155
0.104−0.117
0.093−0.105
8
0000 1000
4.000−4.063
1.666−1.692
1.100−1.117
0.833−0.846
0.749−0.761
64 (1/4 Scale)
0100 0000
8.000−8.063
3.330−3.560
2.200−2.217
1.667−1.680
1.499−1.511
128 (1/2 Scale)
1000 0000
12.000−12.063
5.000−5.026
3.300−3.317
2.500−2.513
2.249−2.261
192 (3/4 Scale)
1100 0000
15.312−15.375
6.380−6.406
4.210−4.230
3.190−3.203
2.869−2.881
245
1111 0101
15.375−15.437
6.406−6.432
4.230−4.245
3.203−3.216
2.881−2.893
246
1111 0110
15.437−15.500
6.432−6.458
4.245−4.263
3.216−3.229
2.893−2.905
247
1111 0111
15.500−15.563
6.458−6.484
4.263−4.280
3.229−3.242
2.905−2.916
248
1111 1000
15.625−15.625
6.484−6.510
4.280−4.300
3.242−3.255
2.916−2.928
249
1111 1001
15.625−15.688
6.510−6.536
4.300−4.314
3.255−3.268
2.928−2.940
250
1111 1010
15.688−15.750
6.536−6.562
4.314−4.330
3.268−3.281
2.940−2.951
251
1111 1011
15.750−15.812
6.562−6.588
4.331−4.348
3.281−3.294
2.951−2.964
252
1111 1100
15.812−15.875
6.588−6.615
4.348−4.366
3.294−3.307
2.964−2.975
253
1111 1101
15.875−15.938
6.615−6.640
4.366−4.383
3.307−3.320
2.975−2.987
254
1111 1110
>15.938
>6.640
>4.383
>3.320
>2.988
255
1111 1111


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