抵抗プログラマブル温度スイッチ搭載、±0.7℃ 温度センサ

製品詳細

Setpoint type Resistor Programmable Setpoint value (°C) -40 to 150 Operating temperature range (°C) -50 to 150 Accuracy over temp range (max) (°C) 1.5 Sensor gain (mV/°C) -12.924, -10.339, -7.752, -5.166 Output type Open drain, Push Pull Supply voltage (min) (V) 2.4 Supply voltage (max) (V) 5.5 Supply current (typ) (µA) 24 Number of comparator channels 1 Features Built-in hysteresis, Trip-Test Pin Rating Catalog Interface type Analog output, Switch
Setpoint type Resistor Programmable Setpoint value (°C) -40 to 150 Operating temperature range (°C) -50 to 150 Accuracy over temp range (max) (°C) 1.5 Sensor gain (mV/°C) -12.924, -10.339, -7.752, -5.166 Output type Open drain, Push Pull Supply voltage (min) (V) 2.4 Supply voltage (max) (V) 5.5 Supply current (typ) (µA) 24 Number of comparator channels 1 Features Built-in hysteresis, Trip-Test Pin Rating Catalog Interface type Analog output, Switch
TSSOP (PW) 8 19.2 mm² 3 x 6.4 WSON (NGR) 8 6.25 mm² 2.5 x 2.5
  • See LM57-Q1 datasheet for AEC-Q100 Grade 1/Grade 0/Grade 0 Extended (Qualified and Manufactured on an Automotive Grade Flow)
  • Trip Temperature Set by External Resistors with
    Accuracy of ±1.7°C or ±2.3°C from -40°C to +150°C
  • Resistor Tolerance Contributes Zero Error
  • Push-Pull and Open-Drain Switch Outputs
  • Wide Operating Temperature and Trip-Temperature Range of −50°C to 150°C,
  • Very Linear Analog VTEMP Temp Sensor Output
    with ±0.8°C or ±1.3°C Accuracy from -40°C to +150°C
  • Short-Circuit Protected Analog and Digital Outputs
  • Latching Function for Digital Outputs
  • TRIP-TEST Pin Allows In-System Testing
  • Low Power Minimizes Self-Heating to Under 0.02°C
  • See LM57-Q1 datasheet for AEC-Q100 Grade 1/Grade 0/Grade 0 Extended (Qualified and Manufactured on an Automotive Grade Flow)
  • Trip Temperature Set by External Resistors with
    Accuracy of ±1.7°C or ±2.3°C from -40°C to +150°C
  • Resistor Tolerance Contributes Zero Error
  • Push-Pull and Open-Drain Switch Outputs
  • Wide Operating Temperature and Trip-Temperature Range of −50°C to 150°C,
  • Very Linear Analog VTEMP Temp Sensor Output
    with ±0.8°C or ±1.3°C Accuracy from -40°C to +150°C
  • Short-Circuit Protected Analog and Digital Outputs
  • Latching Function for Digital Outputs
  • TRIP-TEST Pin Allows In-System Testing
  • Low Power Minimizes Self-Heating to Under 0.02°C

The LM57 device is a precision, dual-output, temperature switch with analog temperature sensor output for wide temperature industrial applications. The trip temperature (TTRIP) is selected from 256 possible values in the range of –40°C to +150°C. The VTEMP is a class AB analog voltage output that is proportional to temperature with a programmable negative temperature coefficient (NTC). Two external 1% resistors set the TTRIP and VTEMP slope. The digital and analog outputs enable protection and monitoring of system thermal events.

Built-in thermal hysteresis (THYST) prevents the digital outputs from oscillating. The TOVER and TOVER digital outputs will assert when the die temperature exceeds TTRIP and will de-assert when the temperature falls below a temperature equal to TTRIP minus THYST.

TOVER is active-high with a push-pull structure. TOVER is active-low with an open-drain structure. Tying TOVER to TRIP-TEST will latch the output after it trips. The output can be cleared by forcing TRIP-TEST low. Driving the TRIP-TEST high will assert the digital outputs. A processor can check the state of TOVER or TOVER, confirming they changed to an active state. This allows for in-situ verification that the comparator and output circuitry are functional after system assembly. When TRIP-TEST is high, the trip-level reference voltage appears at the VTEMP pin. The system could then use this voltage to calculate the threshold of the LM57.

The LM57 device is a precision, dual-output, temperature switch with analog temperature sensor output for wide temperature industrial applications. The trip temperature (TTRIP) is selected from 256 possible values in the range of –40°C to +150°C. The VTEMP is a class AB analog voltage output that is proportional to temperature with a programmable negative temperature coefficient (NTC). Two external 1% resistors set the TTRIP and VTEMP slope. The digital and analog outputs enable protection and monitoring of system thermal events.

Built-in thermal hysteresis (THYST) prevents the digital outputs from oscillating. The TOVER and TOVER digital outputs will assert when the die temperature exceeds TTRIP and will de-assert when the temperature falls below a temperature equal to TTRIP minus THYST.

TOVER is active-high with a push-pull structure. TOVER is active-low with an open-drain structure. Tying TOVER to TRIP-TEST will latch the output after it trips. The output can be cleared by forcing TRIP-TEST low. Driving the TRIP-TEST high will assert the digital outputs. A processor can check the state of TOVER or TOVER, confirming they changed to an active state. This allows for in-situ verification that the comparator and output circuitry are functional after system assembly. When TRIP-TEST is high, the trip-level reference voltage appears at the VTEMP pin. The system could then use this voltage to calculate the threshold of the LM57.

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種類 タイトル 最新の英語版をダウンロード 日付
* データシート LM57 Resistor-Programmable Temperature Switch and Analog Temperature Sensor データシート (Rev. E) PDF | HTML 2015年 7月 15日
EVM ユーザー ガイド (英語) LM57EVM Evaluation Module (EVM) User's Guide 2013年 9月 11日
アプリケーション・ノート AN-1984 LM57 Temperature Switch vs Thermistors (Rev. C) 2013年 5月 1日

設計と開発

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評価ボード

LM57EVM — LM57 評価基板

The Texas Instruments LM57EVM evaluation module helps designers evaluate the operation and performance of the LM57 Resistor-Programmable Temperature Switch and Analog Temperature Sensor.

ユーザー ガイド: PDF
パッケージ ピン数 ダウンロード
TSSOP (PW) 8 オプションの表示
WSON (NGR) 8 オプションの表示

購入と品質

記載されている情報:
  • RoHS
  • REACH
  • デバイスのマーキング
  • リード端子の仕上げ / ボールの原材料
  • MSL 定格 / ピーク リフロー
  • MTBF/FIT 推定値
  • 材質成分
  • 認定試験結果
  • 継続的な信頼性モニタ試験結果
記載されている情報:
  • ファブの拠点
  • 組み立てを実施した拠点

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