Datasheet > ADT7422

ADT7422

更新时间： 2023-12-20 18:46:03

品牌	Logo	应用领域
亚德诺 - ADI		温度传感传感器温度传感器
页数	文件大小	规格书
23页	411K
描述
适用于 VSM 应用的精度为 ±0.1°C 的 16 位数字 I2C?温度传感器

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

ADT7422 数据手册

ADT7422

Data Sheet

APPLICATIONS INFORMATION

THERMAL RESPONSE TIME

POWERING FROM A SWITCHING REGULATOR

Thermal response is a function of the thermal mass of the

temperature sensor and is heavily influenced by the mass of the

object the IC is mounted to. For example, a large PCB containing

large amounts of copper tracking can act as a large heat sink and

slow the thermal response. For a faster thermal response, it is

recommended to mount the sensor on the smallest PCB possible.

Precision analog devices such as the ADT7422 require a well

filtered power source. If the ADT7422 is powered from a switching

regulator, noise may be generated above 50 kHz that can affect

the temperature accuracy specifications. To prevent this issue, use

an RC filter between the power supply and the ADT7422 V_DDpin.

Carefully consider the value of the components used to ensure that

the peak value of the supply noise is less than 1 mV. Mount the

RC filter as far away from the ADT7422 as possible to ensure

that the thermal mass is kept as low as possible.

Figure 11 shows the typical response time of less than two seconds

to reach 63.2% of the temperature span. The temperature value

is read back as a 16-bit value through the digital interface. The

response time includes all delays incurred on the chip during

signal processing.

TEMPERATURE MEASUREMENT

The ADT7422 accurately measures and converts the temperature

at the surface of the semiconductor chip. Thermal paths run

through the leads, the exposed pad, and the plastic package.

When the ADT7422 is used to measure the temperature of a

nearby heat source, the thermal impedance between the heat

source and the ADT7422 must be considered because it impacts

the accuracy and thermal response of the measurement.

SUPPLY DECOUPLING

The ADT7422 must have a decoupling capacitor connected

between V_DDand GND. Otherwise, incorrect temperature

readings are obtained. A 0.1 µF decoupling capacitor, such as a

high frequency ceramic type, must be used and mounted as

close as possible to the V_DDpin of the ADT7422.

For air or surface temperature measurements, take care to

isolate the package, leads, and exposed pad from ambient air

temperature. Use of a thermally conductive adhesive helps to

achieve a more accurate surface temperature measurement.

If possible, power the ADT7422 directly from the system power

supply. This arrangement, shown in Figure 22, isolates the

analog section from the logic-switching transients. If a separate

power supply trace is not available, generous supply bypassing

still reduces supply line induced errors. Local supply bypassing

consisting of a 0.1 µF ceramic capacitor is critical for the

temperature accuracy specifications to be achieved.

QUICK GUIDE TO MEASURING TEMPERATURE

To measure temperature in continuous conversion mode

(default power-up mode), take the following steps:

TTL/CMOS

LOGIC

CIRCUITS

1. When the ADT7422 is powered up, read the device ID

(Register Address 0x0B) to verify the setup. The ID reads

0xCB.

0.1µF

ADT7422

2. When consistent, consecutive readings are obtained from

Step 1, read the configuration register (Register Address 0x03),

_CRITsetpoint registers (Register Address 0x08 and Register

POWER

SUPPLY

Address 0x09), T_HIGHsetpoint registers (Register Address 0x04

and Register Address 0x05), and T_LOWsetpoint registers

(Register Address 0x06 and Register Address 0x07).

Compare the values to the specified defaults in Table 13. If

all readings match, the interface is operational.

3. Write to the configuration register to set the ADT7422 to

the desired configuration.

Figure 22. Use of Separate Traces to Reduce Power Supply Noise

4. Read the temperature value most significant byte register

followed by the temperature value least significant byte

measurement.

Rev. A | Page 22 of 23

1...19 20 212223

中文翻译

下载PDF

与ADT7422相关器件

型号	品牌	获取价格	描述	数据表
ADT7460	ONSEMI	获取价格	dBCOOL Remote Thermal Monitor and Fan Controller
ADT7460	ADI	获取价格	dB COOL?? Remote Thermal Controller and Fan Controller
ADT7460ARQ	ADI	获取价格	dB COOL?? Remote Thermal Controller and Fan Controller
ADT7460ARQ	ONSEMI	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO16, MO-137AB, QSOP-16
ADT7460ARQ	ROCHESTER	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO16, 0.025 INCH PITCH, MO-137AB, QSOP-16
ADT7460ARQ-REEL	ONSEMI	获取价格	Remote Thermal Monitor and Fan Controller
ADT7460ARQ-REEL	ROCHESTER	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO16, MO-137AB, QSOP-16
ADT7460ARQ-REEL7	ONSEMI	获取价格	IC SPECIALTY ANALOG CIRCUIT, PDSO16, MO-137AB, QSOP-16, Analog IC:Other
ADT7460ARQ-REEL7	ROCHESTER	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO16, MO-137AB, QSOP-16
ADT7460ARQZ	ONSEMI	获取价格	dBCOOL Remote Thermal Monitor and Fan Controller

与ADT7422相关文章

压敏电阻器在直流电路中的过压保护应用探讨
2024-06-07

4
电感耐压值及其与电感大小的关系
2024-06-07

9
CNY17F光耦合器：特性、应用、封装、引脚功能及替换型号解析
2024-06-07

5
DS1307资料解析：特性、引脚说明、替代推荐
2024-06-07

5

产品中心

服务支持

精选活动

关于我们

帮助中心

ADT7422

ADT7422 数据手册

与ADT7422相关器件

与ADT7422相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

ADT7422

ADT7422 数据手册

与ADT7422相关器件

与ADT7422相关文章

您还可以找

您在本页遇到什么问题？