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Thermostat output temperature sensor IC debuts

Posted: 22 Nov 2007     Print Version  Bookmark and Share

Keywords:Temperature witching function; high-accuracy reference; circuit design 

Thermostat sensor IC

ROHM has developed thermostat output temperature sensor ICs that electronically detect the temperature in current and next generation electronic products requiring temperature control and circuits that generate heat, such as power supplies and motor drivers.

Normally, a thermistor or comparator is used for temperature detection. However, these require precision reference voltages and complicated circuitry. ROHM's new ICs integrate a high precision reference voltage source, comparator, and constant current circuit with a temperature detection element into a single chip, simplifying circuit design and reducing costs. Two series are offered, the BDExxx0G (open drain, active low) that can switch between 3 levels, centered around the detection temperature (+5°C or −5°C), and the BDFxxx0G series (open drain, active low), featuring 9-interval switching, also centered at the detection temperature (+2.5°C, +5°C, +7.5°C, +10°C, −2.5°C, −5°C, −7.5°C, or −10°C). This eliminates the need to stock multiple temperature ICs −required when the detection temperature changes due to circuit modification or target operating environment −reducing costs while increasing design flexibility.

Samples of 90°C and 120°C detector units in the BDExxx0G series (sample price: Rs.138.42 (3.5$)) and 100°C detector models in the BDFxxx0G series (sample price: Rs.170.06 (4.3$)) are available, with mass production scheduled for December.

Main Features of the BDExxx0G Series and BDFxxx0G Series; Wide detection temperature range of BDExxx0G Series: 15 types from −20°C to +120°C, in increments of 10°C and BDFxxx0G Series: 8 types from −20°C to +120°C, in increments of 20°C .The detection temperature switching function based on control pins are in BDExxx0G Series: switching among three levels from +5°C or −5°C, centered around the detection temperature and in BDFxxx0G Series: switching among nine levels from +2.5°C, +5°C, +7.5°C, +10°C, −2.5°C, −5°C, −7.5°C, or −10°C, centered around the detection temperature.High temperature detection accuracy: ±4°C (±5°C for 120°C detection: BDE1200G, BDF1200G).Its low current consumption is 16µA typ.and its detection temperature hysteresis is 10°C typ.

Features include open Drain output and active Low operation along with ±4°C temperature detection accuracy that eliminates the need for complicated designs. Compact package types of BDExxx0G Series is SSOP5 ( and BDFxxx0G Series is SSOP6 (

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