ADM1031(2012) 查看數據表（PDF） - ON Semiconductor

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ADM1031
(Rev.:2012)

Intelligent Temperature Monitor and Dual PWM Fan Controller

ON Semiconductor 

ADM1031

I

NI

IBIAS

VDD

D+

REMOTE

SENSING

TRANSISTOR

D−

BIAS

DIODE

LOW-PASS FILTER

fC = 65 kHz

VOUT+

To ADC

VOUT−

Figure 18. Signal Conditioning

If a discrete transistor is used, then the collector is not

grounded, and is linked to the base. If a PNP transistor is

used, the base is connected to the D– input and the emitter

to the D+ input. If an NPN transistor is used, the emitter is

connected to the D– input and the base to the D+ input.

One LSB of the ADC corresponds to 0.125C, so the

ADM1031 can theoretically measure temperatures from

–127C to +127.75C, although –127C is outside the

operating range for the device. The extended temperature

resolution data format is shown in Table 7 and Table 8.

Table 6. TEMPERATURE DATA FORMAT − (LOCAL

TEMPERATURE AND REMOTE TEMPERATURE HIGH

BYTES)

Temperature (5C)

−128C

Digital Output

1000 0000

−125C

−100C

1000 0011

1001 1100

−75C

1011 0101

−50C

−25C

1100 1110

1110 0111

−1C

0C

1111 1111

0000 0000

+1C

0000 0001

+10C

+25C

0000 1010

0001 1001

+50C

+75C

0011 0010

0100 1011

+100C

0110 0100

+125C

+127C

0111 1101

0111 1111

Table 7. REMOTE SENSOR EXTENDED

TEMPERATURE RESOLUTION

Extended Resolution

0.000C

0.125C

0.250C

0.375C

0.500C

0.625C

0.750C

0.875C

Remote Temperature

Low Bits

000

001

010

011

100

101

110

111

The extended temperature resolution for the local and

remote channels is stored in the extended temperature

resolution register (Register 006), and is outlined in Table 22.

Table 8. LOCAL SENSOR EXTENDED

TEMPERATURE RESOLUTION

Extended Resolution

0.00C

0.25C

0.50C

0.75C

Local Temperature

Low Bits

00

01

10

11

To prevent ground noise interfering with the

measurement, the more negative terminal of the sensor is not

referenced to ground, but biased above ground by an internal

diode at the D– input. If the sensor is used in a very noisy

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