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Dallas Semiconductor Corp: DS75 2-Wire Thermal Watchdog Product Announcement
DS75 2-Wire Thermal Watchdog

Product Features
The DS75 2-Wire Thermal Watchdog is a drop-in replacement for the National Semiconductor LM75CIM-x, a widely used 2-wire temperature sensor in personal computers. It is fully software- and pinout-compatible with the LM75 in the power-on default mode, but offers two advantages over the National product. The first is that resolution of the temperature reading can be adjusted to 10, 11, or 12 bits from the default value of 9 by changing two bits in the SRAM configuration register. These two configuration bits are undefined in the LM75, so changing them will not lose functionality. The second advantage is that only one DS75 part will cover the full power supply range of 2.7V < VDD < 5.5V while maintaining the specified accuracy of ±2.0°C over the range -25°C to +100°C and ±3.0°C over the range -55°C to +125°C.
Key Features
- Fully pinout- and software-compatible with the National Semiconductor LM75CIM-x
- Measures temperature from -55°C to +125°C in 0.5°C (9-bit) increments (-67°F to +257°F in 0.9°F increments) in the default mode
- Resolution enhanceable to 10, 11, or 12 bits by adjusting device configuration in software
- Thermometer is precise to within ±2.0°C across the -25°C to +100°C range
- Supply voltage range covers 2.7V to 5.5V, maintaining spec accuracy over the full supply range
- Converts temperature to a digital word in 150 ms (max.) in the default (9-bit mode)
- Over-temperature and hysteresis setpoints are user-definable in software
- Dedicated thermostatic output with two distinct transfer functions
- Programmable over-temperature fault tolerance
- Data is read/written over an addressable (3-bit) 2-wire serial interface, allowing for multipoint sensing on a single 2-wire bus
Packages
- 150 mil 8-pin SOIC (DS75S)
- 2500-piece SOIC reel (DS75S-TRL)
Applications
The DS75 is well-suited for the broad computing market, including desktop, mobile, workstations, and servers. With the addressability of the DS75, multipoint sensing within one platform allows monitoring of the CPU, power converters, PCMCIA sockets, video drivers, and docking station. Non-PC applications include printers, fax machines, copiers, or any microcontroller-based, thermally sensitive system.
Availability
- Samples: NOW (DS75S)
- Production: Volume in Dec '97
- DS75 data sheet is available on Dallas Semiconductor's Web site or through the Faxback service
Factory Contacts
Mike Overlaur, Product Manager
Tel: (972) 371-6167
Fax: (972) 371-3717
E-mail: mike.overlaur@dalsemi.com
Datasheets and other product information available from:
Fax-on-demand: (972) 371-4441
FTP Site: ftp://ftp.dalsemi.com/
World Wide Web: http://www.dalsemi.com/
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