參數(shù)資料
型號(hào)： ADM1025ARQ
廠商： ON Semiconductor
文件頁(yè)數(shù)： 2/19頁(yè)
文件大?。?/td> 0K
描述： IC MONITOR SYS/VOLT 5CH 16QSOP
產(chǎn)品變化通告： MFG CHG Notification ADI to ON Semi
LTB Notification
標(biāo)準(zhǔn)包裝： 98
應(yīng)用： PC，PDA
接口： I²C
電源電壓： 3 V ~ 5.5 V
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 管件
安裝類型： 表面貼裝
ADM1025, ADM1025A
http://onsemi.com
10
allow for the tolerance of these supply voltages, the A/D
converter produces an output of . full scale (decimal 192) for
the nominal input voltage and so has adequate headroom to
cope with overvoltages. Table 6 shows the input ranges of
the analog inputs and output codes of the A/D converter.
When the ADC is running, it samples and converts an
input every 11.6 ms, except for the external temperature (D+
and D) input. This has special input signal conditioning and
is averaged over 16 conversions to reduce noise; a
measurement on this input takes nominally 34.8 ms.
Input Circuits
The internal structure for the analog inputs is shown in
Figure 13. 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.
Table 6. 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
Temperature Measurement System
Internal Temperature Measurement
The ADM1025/ADM1025A contains an on-chip band
gap temperature sensor whose output is digitized by the
on-chip ADC. The temperature data is stored in the Local
Temperature Value Register (Address 27h). As both
positive and negative temperatures can be measured, the
temperature data is stored in twos complement format, as
shown in Table 7. Theoretically, the temperature sensor and
ADC can measure temperatures from 128C to +127C
with a resolution of 1C, although temperatures below 0C
and above +100C are outside the operating temperature
range of the device.
External Temperature Measurement
The ADM1025/ADM1025A can measure temperature
using an external diode sensor or diode-connected transistor
connected to Pins 9 and 10.
The forward voltage of a diode or diode-connected
transistor, operated at a constant current, exhibits a negative
temperature coefficient of about 2 mV/C. Unfortunately,
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