adm9240 Analog Devices, Inc., adm9240 Datasheet - Page 9

• Manufacturer Part Number: adm9240
• Description: Low Cost Microprocessor System Hardware Monitor
• Manufacturer: Analog Devices, Inc.

REV. 0
+12 V
0.062–0.125
0.125–0.187
0.188–0.250
0.250–0.313
0.313–0.375
0.375–0.438
0.438–0.500
0.500–0.563
4.000–4.063
8.000–8.063
12.000–12.063
15.313–15.375
15.375–15.438
15.438–15.500
15.500–15.563
15.563–15.625
15.625–15.688
15.688–15.750
15.750–15.813
15.813–15.875
15.875–15.938
The input ranges of the analog inputs are shown in more detail
in Table I.
The +V
core voltages, and have an input range from 0 V to 3.6 V. If
only a single processor core voltage is being monitored, the
V
achieved by using a resistive divider network referenced to a
known positive dc voltage. This is illustrated in Figure 4.
INPUT CIRCUITS
The internal structure for the analog inputs is shown in Figure
3. Each input circuit consists of an input protection diode, an
attenuator, plus a capacitor to form a first order low-pass filter
which gives the input immunity to high frequency noise.
CCP2
<0.062
>15.938
IN
input may be used to monitor the –12 V supply. This is
CCP1
and +V
+5 V
0.026–0.052
0.052–0.078
0.078–0.104
0.104–0.130
0.130–0.156
0.156–0.182
0.182–0.208
0.208–0.234
1.666–1.692
3.330–3.560
5.000–5.026
6.380–6.406
6.406–6.432
6.432–6.458
6.458–6.484
6.484–6.510
6.510–6.536
6.536–6.562
6.562–6.588
6.588–6.615
6.615–6.640
CCP2
<0.026
>6.640
IN
inputs are used to measure processor
+3.3 V
0.017–0.034
0.034–0.052
0.052–0.069
0.069–0.086
0.086–0.103
0.103–0.120
0.120–0.138
0.138–0.155
1.100–1.117
2.200–2.217
3.300–3.317
4.210–4.230
4.230–4.245
4.245–4.263
4.263–4.280
4.280–4.300
4.300–4.314
4.314–4.331
4.331–4.348
4.348–4.366
4.366–4.383
<0.0172
>4.383
Input Voltage
IN
Table I. A/D Output Code vs. V
+2.5 V
0.013–0.026
0.026–0.039
0.039–0.052
0.052–0.065
0.065–0.078
0.078–0.091
0.091–0.104
0.104–0.117
0.833–0.846
1.667–1.680
2.500–2.513
3.190–3.203
3.203–3.216
3.216–3.229
3.229–3.242
3.242–3.255
3.255–3.268
3.268–3.281
3.281–3.294
3.294–3.307
3.307–3.320
<0.013
>3.320
IN
l
l
l
l
l
l
l
l
l
l
l
l
–9–
+V
0.014–0.028
0.028–0.042
0.042–0.056
0.056–0.070
0.070–0.084
0.084–0.098
0.098–0.112
0.112–0.126
0.900–0.914
1.800–1.814
2.700–2.714
3.445–3.459
3.459–3.473
3.473–3.487
3.487–3.501
3.501–3.515
3.515–3.529
3.529–3.543
3.543–3.558
3.558–3.572
3.572–3.586
<0.014
>3.586
CCP1
Figure 3. Internal Structure of Analog Inputs
+V
+V
+3.3V
+2.5V
IN
CCP2
CCP1
+12V
+5V
+V
0.014–0.028
0.028–0.042
0.042–0.056
0.056–0.070
0.070–0.084
0.084–0.098
0.098–0.112
0.112–0.126
0.900–0.914
1.800–1.814
2.700–2.714
3.445–3.459
3.459–3.473
3.473–3.487
3.487–3.501
3.501–3.515
3.515–3.529
3.529–3.543
3.543–3.558
3.558–3.572
3.572–3.586
<0.014
>3.586
CCP2
122.2k
42.7k
91.6k
61.1k
36.7k
42.7k
111.2k
97.3k
22.7k
55.2k
80.9k
97.3k
Decimal
64 (1/4 Scale)
128 (1/2 Scale) 10000000
192 (3/4 Scale) 11000000
50pF
35pF
25pF
25pF
25pF
50pF
245
246
247
248
249
250
251
252
253
254
255
1
2
3
4
5
6
7
8
0
A/D Output
ADM9240
MUX
Binary
00000000
00000001
00000010
00000011
00000100
00000101
00000110
00000111
00001000
01000000
11110101
11110110
11110111
11111000
11111001
11111010
11111011
11111100
11111101
11111110
11111111