June 25, 2001 - National Semiconductor Corporation (NYSE:NSM), continuing its leadership in the temperature sensor market, today introduced the LM88 dual remote diode temperature comparator, and the LM26 temperature sensor, featuring a customized, preset thermostat trip point with analog temperature sensing output. National's LM88 and LM26 temperature sensors are ideal for applications in PC notebooks, desktops, workstations and servers, as well as in portable battery-powered systems.
National's two new devices safeguard systems without requiring additional BIOS support. These products begin monitoring as soon as the system is powered up.
With its large offering of individual solutions, National has one of the industry's broadest portfolios of analog temperature sensors, remote diode temperature sensors and systems hardware monitoring products.
"We keep expanding National's temperature sensor portfolio because we are committed to offering customers the highest accuracy, lowest power and smallest packaging in the industry," said Zaryab Hamavand, marketing manager for National's thermal solutions products. "National's newest temperature sensor products integrate safety features and improved performance that exceed competitive offerings."
LM88
National's LM88 is a dual remote diode temperature sensor, with three digital comparator outputs. The LM88 incorporates a Delta-Sigma analog-to-digital converter to reduce noise injection from the remote diodes. Its low noise immunity makes sensing temperature remotely quieter than competitive solutions. The three comparator outputs are driven by over-temperature register settings for each diode, and one critical temperature register setting common for both channels. These outputs are factory programmed and can be customized to many different system needs. The open drain outputs are configurable to over temperature or under temperature comparisons and can be used as interrupts or as a system shutdown.
The LM88 senses the temperature of a two-target integrated circuit, such as a Pentium III processor or a diode-connected 2N3904 transistor. Additionally, the LM88 can be used as an inexpensive four-step fan controller for the PC market. The flexibility of the LM88 enables system designers the ability to customize their thermal solutions to specific system needs.
LM26
National's LM26 is a precision, single digital output, low-power thermostat. Utilizing factory programming, the LM26 can offer different trip points as well as different digital output functionality. The trip point can be factory preset in 1?C increments in the range of -55?C to 110?C. The digital output can be preset to open drain active low or push-pull active high. The hysteresis input enables system designers to select between 2?C or 10?C of hysteresis.
This device not only acts as a thermostat, but also has an analog voltage output. This output enables system designers to perform functionality testing on the LM26 after the device has been mounted on the PCB. Also, the LM26 has excellent immunity to power supply noise, which helps prevent false tripping. These features, coupled with the +/- 3?C of trip point accuracy, set the LM26 apart from the competition. The flexibility and superior performance of the LM26 enable system designers to optimize their thermal solution based on their system needs.
Pricing and Availability
The LM88 is available now in an MSOP-8 package and is priced at $0.85 in 1000-unit quantities. The LM26 is available now in a SOT23-5 package and is priced at $0.59 in 1000-unit quantities. For more information on customizing the LM88 and LM26 for your system needs, visit National's World Wide Web site at http://www.national.com/pf/LM/LM88.html and http://www.national.com/pf/LM/LM26.html. For more information on National Semiconductor's data conversion products, visit http://www.national.com/appinfo/tempsensors/.
About National Semiconductor
National Semiconductor is the premier analog company driving the information age. Combining real-world analog and state-of-the-art digital technology, the company is focused on the fast growing markets for wireless handsets; information appliances; information infrastructure; and display, imaging and human interface technologies. With headquarters in Santa Clara, California, National reported sales of $2.1 billion for fiscal year 2001 and employs about 9,700 people worldwide. Additional company and product information is available on the World Wide Web at www.national.com.
