ADT7483A

更新时间： 2024-02-21 07:25:52

品牌	Logo	应用领域
亚德诺 - ADI		传感器温度传感器
页数	文件大小	规格书
24页	502K
描述
Dual Channel Temperature Sensor and Over Temperature Alarm

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技术参数
数据手册

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ADT7483A 技术参数

是否无铅：	不含铅	生命周期：	Active
包装说明：	SSOP16,.25	针数：	16
Reach Compliance Code：	compliant	Factory Lead Time：	7 weeks
风险等级：	0.95	Is Samacsys：	N
最大精度（摄氏度）：	2.5 Cel	其他特性：	HYSTERESIS IS 0.5V
主体宽度：	3.91 mm	主体高度：	1.75 mm
主体长度或直径：	4.9 mm	JESD-609代码：	e3
安装特点：	SURFACE MOUNT	位数：	8
端子数量：	16	最大工作电流：	0.35 mA
最高工作温度：	125 °C	最低工作温度：	-40 °C
输出接口类型：	2-WIRE INTERFACE	封装主体材料：	PLASTIC/EPOXY
封装等效代码：	SSOP16,.25	封装形状/形式：	RECTANGULAR
电源：	3.3 V	传感器/换能器类型：	TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL
子类别：	Other Sensors	最大供电电压：	3.6 V
最小供电电压：	3 V	表面贴装：	YES
温度系数：	NEGATIVE ppm/ °C	端子面层：	Tin (Sn)
端接类型：	SOLDER	Base Number Matches：	1

ADT7483A 数据手册

ADT7483A

THEORY OF OPERATION

The ADT7483A is a local and 2x remote temperature sensor

and over/under temperature alarm. When the ADT7483A is

operating normally, the on-board ADC operates in a free-

running mode. The analog input multiplexer alternately selects

either the on-chip temperature sensor or one of the remote

temperature sensors to measure its local temperature. The ADC

digitizes these signals, and the results are stored in the local,

Remote 1, and Remote 2 temperature value registers.

emitter voltage (V_BE) of a transistor, operated at constant

current. Unfortunately, this technique requires calibration to

null the effect of the absolute value of V_BE, which varies from

device to device. The technique used in the ADT7483A is to

measure the change in V_BEwhen the device is operated at two

different currents.

Figure 15 shows the input signal conditioning used to measure

the output of a remote temperature sensor. This figure shows

the remote sensor as a substrate transistor, but it could equally

be a discrete transistor. If a discrete transistor is used, the

collector is not grounded and should be linked to the base. To

prevent ground noise interfering with the measurement, the

more negative terminal of the sensor is not referenced to ground

but is biased above ground by an internal diode at the D− input.

C1 can be optionally added as a noise filter (recommended

maximum value 1,000 pF).

The local and remote measurement results are compared with

THERM

the corresponding high, low, and

temperature limits

stored in on-chip registers. Out-of-limit comparisons generate

flags that are stored in the status register. A result that exceeds

the high temperature limit, the low temperature limit, or a

ALERT

remote diode open circuit causes the

output to assert

temperature limits causes the

ALERT

THERM

output to assert low. The

low. Likewise, exceeding

THERM

output can be

output.

THERM

reprogrammed as a second

To measure ΔV_BE, the operating current through the sensor is

switched among two related currents, I and N × I. The currents

through the temperature diode are switched between I and N × I,

giving ΔV_BE. The temperature is then calculated using the ΔV_BE

measurement.

The limit registers can be programmed, and the device

controlled and configured, via the serial SMBus. The contents

of any register can also be read back via the SMBus.

Control and configuration functions consist of:

The resulting ΔV_BEwaveforms pass through a 65 kHz low-pass

filter to remove noise and then to a chopper-stabilized

amplifier. This amplifies and rectifies the waveform to produce

a dc voltage proportional to ΔV_BE. The ADC digitizes this

voltage and produces a temperature measurement. To reduce

the effects of noise, digital filtering is performed by averaging

the results of 16 measurement cycles for low conversion rates.

At rates of 16, 32, and 64 conversions/second, no digital

averaging takes place.

•

Switching the device between normal operation and

standby mode.

•

Selecting the temperature measurement scale.

ALERT

Masking or enabling the

Switching Pin 13 between

output.

ALERT THERM2

and

Selecting the conversion rate.

TEMPERATURE MEASUREMENT METHOD

Signal conditioning and measurement of the local temperature

sensor is performed in the same manner.

A simple method of measuring temperature is to exploit the

negative temperature coefficient of a diode, measuring the base-

BIAS

N × I

OUT+

D+

TO ADC

REMOTE

SENSING

TRANSISTOR

LPF

f_C= 65kHz

D–

OUT–

BIAS

DIODE

CAPACITOR C1 IS OPTIONAL. IT IS ONLY NECESSARY IN NOISY ENVIRONMENTS. C1 = 1000pF MAX.

Figure 15. Input Signal Conditioning

Rev. 0 | Page 9 of 24

1...6 7 8910 11 12...24

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