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ADM1031ARQZ-REEL

更新时间： 2024-01-23 19:33:58

品牌	Logo	应用领域
安森美 - ONSEMI		风扇传感器换能器温度传感器监控控制器
页数	文件大小	规格书
30页	294K
描述
Intelligent Temperature Monitor and Dual PWM Fan Controller

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ADM1031ARQZ-REEL 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	Reach Compliance Code：	unknown
风险等级：	5.28	最大精度（摄氏度）：	3 Cel
主体宽度：	3.91 mm	主体高度：	1.55 mm
主体长度或直径：	4.9 mm	外壳：	PLASTIC
JESD-609代码：	e3	安装特点：	SURFACE MOUNT
位数：	8	最大工作电流：	3 mA
最高工作温度：	100 °C	最低工作温度：
输出接口类型：	2-WIRE INTERFACE	封装形状/形式：	RECTANGULAR
传感器/换能器类型：	TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL	最大供电电压：	5.5 V
最小供电电压：	3 V	表面贴装：	YES
端子面层：	MATTE TIN	端接类型：	SOLDER
Base Number Matches：	1

ADM1031ARQZ-REEL 数据手册

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ADM1031

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 27.

N × I

BIAS

Table 4. Local Sensor Extended Temperature

Resolution

OUT+

D+

D–

Extended Resolution

0.00°C

Local Temperature Low Bits

ADC

REMOTE

SENSING

TRANSISTOR

BIAS

DIODE

OUT–

0.25°C

LOW−PASS

FILTER

0.50°C

= 65kHz

0.75°C

Figure 18. Signal Conditioning

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

environment, a capacitor of value up to 1000 pF can be

placed between the D+ and D– inputs to filter the noise.

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 3 and Table 4.

To measure DV , the sensor is switched between

operating currents of I and N × I. The resulting waveform is

passed through a 65 kHz low−pass filter to remove noise,

then to a chopper−stabilized amplifier that performs the

functions of amplification and rectification of the waveform

Table 2. Temperature Data Format − (Local

Temperature and Remote Temperature High Bytes)

to produce a dc voltage proportional to DV . This voltage

is measured by the ADC to give a temperature output in

11−bit twos complement format. To further reduce the

effects of noise, digital filtering is performed by averaging

the results of 16 measurement cycles. An external

temperature measurement nominally takes 9.6 ms.

Temperature (5C)

−128°C

−125°C

−100°C

−75°C

Digital Output

1000 0000

1000 0011

1001 1100

1011 0101

1100 1110

1110 0111

1111 1111

0000 0000

0000 0001

0000 1010

0001 1001

0011 0010

0100 1011

0110 0100

0111 1101

0111 1111

Layout Considerations

−50°C

Digital boards can be electrically noisy environments and

care must be taken to protect the analog inputs from noise,

particularly when measuring the very small voltages from a

remote diode sensor. The following precautions should be

taken:

−25°C

−1°C

0°C

+1°C

1. Place the ADM1031 as close as possible to the

remote sensing diode. Provided that the worst

noise sources such as clock generators,

+10°C

+25°C

+50°C

data/address buses, and CRTs are avoided, this

distance can be 4 to 8 inches.

+75°C

+100°C

+125°C

+127°C

2. Route the D+ and D– tracks close together, in

parallel, with grounded guard tracks on each side.

Provide a ground plane under the tracks if possible.

3. Use wide tracks to minimize inductance and

reduce noise pickup. Ten mil track minimum

width and spacing is recommended.

Table 3. Remote Sensor Extended Temperature

Resolution

Extended Resolution

0.000°C

Remote Temperature Low Bits

000

001

010

011

100

101

110

111

10MIL

GND

0.125°C

0.250°C

D+

10MIL

0.375°C

0.500°C

D–

0.625°C

10MIL

0.750°C

GND

0.875°C

Figure 19. Arrangement of Signal Tracks

http://onsemi.com

1...7 8 91011 12 13...30

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