Datasheet > ADM1032ARM-1RL7

ADM1032ARM-1RL7

更新时间： 2024-01-22 12:16:21

品牌	Logo	应用领域
安森美 - ONSEMI		光电二极管
页数	文件大小	规格书
18页	197K
描述
SPECIALTY ANALOG CIRCUIT, PDSO8, MO-187AA, MSOP-8

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技术参数
数据手册

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ADM1032ARM-1RL7 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	TSSOP	包装说明：	MO-187AA, MSOP-8
针数：	8	Reach Compliance Code：	not_compliant
HTS代码：	8542.39.00.01	风险等级：	5.04
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	S-PDSO-G8
长度：	3 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	8
最高工作温度：	120 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	225	认证状态：	Not Qualified
座面最大高度：	1.1 mm	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	3 V	标称供电电压 (Vsup)：	3.3 V
表面贴装：	YES	温度等级：	OTHER
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3 mm	Base Number Matches：	1

ADM1032ARM-1RL7 数据手册

ADM1032

Layout Considerations

6. If the distance to the remote sensor is more than

eight inches, the use of twisted pair cable is

recommended. This works up to about 6 feet to

12 feet.

7. For really long distances (up to 100 feet), use

shielded twisted pair, such as Belden #8451

microphone cable. Connect the twisted pair to D+

and D− and the shield to GND close to the

ADM1032. Leave the remote end of the shield

unconnected to avoid ground loops.

Digital boards can be electrically noisy environments, and

the ADM1032 is measuring very small voltages from the

remote sensor, so care must be taken to minimize noise

induced at the sensor inputs. The following precautions

should be taken.

1. Place the ADM1032 as close as possible to the

remote sensing diode. Provided that the worst

noise sources, that is, clock generators,

data/address buses, and CRTs, are avoided, this

distance can be four to eight inches.

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.

Because the measurement technique uses switched

current sources, excessive cable and/or filter capacitance

can affect the measurement. When using long cables, the

filter capacitor can be reduced or removed.

Cable resistance can also introduce errors. 1 W series

resistance introduces about 1°C error.

3. Use wide tracks to minimize inductance and

reduce noise pickup. 10 mil track minimum width

and spacing is recommended.

Power Sequencing Considerations

Power Supply Slew Rate

When powering up the ADM1032 you must ensure that

GND

D+

10 MIL

the slew rate of V is less than 18 mV/ms. A slew rate larger

than this may cause power-on-reset issues and yield

unpredictable results.

D−

THERM Pin Pullup

As mentioned above, the THERM signal is open drain and

GND

requires a pullup to V . The THERM signal must always

be pulled up to the same power supply as the ADM1032,

unlike the SMBus signals (SDA, SCL and ALERT) that can

be pulled to a different power rail. The only time the

THERM pin can be pulled to a different supply rail (other

Figure 18. Typical Arrangement of Signal Tracks

4. Try to minimize the number of copper/solder

joints, which can cause thermocouple effects.

Where copper/solder joints are used, make sure

that they are in both the D+ and D− path and at the

same temperature.

than V ) is if the other supply is powered up simultaneous

with, or after the ADM1032 main V . This is to protect the

internal circuitry of the ADM1032. If the THERM pullup

supply rail were to rise before V , the POR circuitry may

Thermocouple effects should not be a major

problem since 1°C corresponds to about 200 mV

and thermocouple voltages are about 3 mV/°C of

temperature difference. Unless there are two

thermocouples with a big temperature differential

between them, thermocouple voltages should be

much less than 200 mV.

not operate correctly.

Application Circuit

Figure 19 shows a typical application circuit for the

ADM1032, using a discrete sensor transistor connected via

a shielded, twisted pair cable. The pullups on SCLK,

SDATA, and ALERT are required only if they are not

already provided elsewhere in the system.

The SCLK and SDATA pins of the ADM1032 can be

interfaced directly to the SMBus of an I/O controller, such

as the Intel 820 chipset.

5. Place a 0.1 mF bypass capacitor close to the V

pin. In very noisy environments, place a 1000 pF

input filter capacitor across D+ and D− close to the

ADM1032.

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