Datasheet > LM57BISDX-5

LM57BISDX-5

更新时间： 2024-11-21 05:42:23

品牌	Logo	应用领域
美国国家半导体 - NSC		开关传感器温度传感器
页数	文件大小	规格书
18页	529K
描述
Resistor-Programmable Temperature Switch and Analog Temperature Sensor

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LM57BISDX-5 数据手册

May 11, 2009

LM57

Resistor-Programmable Temperature Switch and Analog

Temperature Sensor

General Description

Applications

The LM57 is a precision, dual-output, temperature switch with

integrated analog temperature sensor. The trip temperature

(T_TRIP) is programmable by using two external 1% resistors.

Using extremely small packaged resistors (0.5 mm x 1 mm),

the LM57 can be programmed to any of 256 trip temperatures

while consuming very little board space. The V_TEMPoutput

delivers an analog output voltage which is inversely propor-

tional to the measured temperature.

Cell phones

■

Wireless transceivers

Digital cameras

Personal digital assistants (PDA's)

Battery management

Automotive

Disk drives

Built-in temperature hysteresis (T_HYST) keeps the output sta-

ble in an environment of thermal oscillation. The digital tem-

perature switch outputs will go active when the die tempera-

ture exceeds T_TRIPand will release when the temperature falls

below a temperature equal to T_TRIPminus T_HYST. One of the

digital outputs, T_OVER, is active-high with a push-pull structure.

The other digital output, T_OVER, is active-low with an open-

drain structure.

Games

Appliances

■

Features

Trip temperature set by external resistors

■

External resistor tolerance contributes zero error

Push-pull and open-drain temperature switch outputs

Driving the TRIP-TEST input high will make the digital outputs

active. A processor can read the logic level of the temperature

switch outputs, confirming that they changed to their active

state. This allows for in-situ verification that the comparator

and output circuitry are functional after system assembly.

When the TRIP-TEST pin is high, the trip-level reference volt-

age appears at the Vtemp pin. The system could then use this

voltage to calibrate the sensor for even tighter accuracy. Ty-

ing T_OVERto TRIP-TEST will latch the output after it trips. It

can be cleared by forcing TRIP-TEST low or powering off the

LM57.

Wide operating temperature and trip-temperature range of

−50°C to 150°C

Very linear analog V_TEMPtemperature sensor output

■

Analog and digital outputs are short-circuit protected

TRIP-TEST pin allows in-system testing

Latching function for the digital outputs

Very small 2.5 mm by 2.5 mm 8-Pin LLP package

■

Key Specifications

As it draws only 28µA max from its supply, it has very low self-

heating, about 0.02°C in still air.

Supply voltage

Supply current

Temperature switch accuracy

Analog (V_TEMP) Accuracy

Operating temperature

Hysteresis magnitude

2.4V to 5.5V

■

24 μA (typ)

±1.5°C

±0.7°C

−50°C to 150°C

5°C, 10°C

Connection Diagram

Typical Application

8 – Pin LLP

30080501

Top View

30080502

FIGURE 1. Over-Temperature Output to Microcontroller

Digital Input

300805

www.national.com

12 3 4 5 6 7...18

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与LM57BISDX-5相关器件

型号	品牌	获取价格	描述	数据表
LM57BISDX-5/NOPB	TI	获取价格	具有电阻可编程温度开关的 ±0.7°C 温度传感器 \| NGR \| 8 \| -50 to
LM57CISD-10	NSC	获取价格	Resistor-Programmable Temperature Switch and Analog Temperature Sensor
LM57CISD-10/NOPB	TI	获取价格	具有电阻可编程温度开关的 ±0.7°C 温度传感器 \| NGR \| 8 \| -50 to
LM57CISD-5	NSC	获取价格	Resistor-Programmable Temperature Switch and Analog Temperature Sensor
LM57CISD-5/NOPB	TI	获取价格	具有电阻可编程温度开关的 ±0.7°C 温度传感器 \| NGR \| 8 \| -50 to
LM57CISDX-10	NSC	获取价格	Resistor-Programmable Temperature Switch and Analog Temperature Sensor
LM57CISDX-10/NOPB	TI	获取价格	具有电阻可编程温度开关的 ±0.7°C 温度传感器 \| NGR \| 8 \| -50 to
LM57CISDX-5	NSC	获取价格	Resistor-Programmable Temperature Switch and Analog Temperature Sensor
LM57CISDX-5/NOPB	TI	获取价格	具有电阻可编程温度开关的 ±0.7°C 温度传感器 \| NGR \| 8 \| -50 to
LM57FEPWQ1	TI	获取价格	具有电阻可编程温度开关的汽车级、±0.7°C 温度传感器 \| PW \| 8 \| -50 t

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