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Microchip rolls resistor programmable logic-output temp switches

Posted: 15 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:temperature switch? logic resistor? battery-powered device?


Microchip Technology Inc.'s new resistor-programmable logic-output temperature switches enable designers to stock one device for measuring multiple temperature points.

The low-power devices' temperature-switch threshold can be programmed with a single external resistor, meaning designers can stock one device for measuring multiple temperature points by varying the external resistance value. With an operating voltage range of 2.7V to 5.5V and the ability to trigger for temperatures ranging from -40C to +125C with high accuracy, the MCP9509/10 switches enable better, smaller and less expensive designs.

Many applications require monitoring multiple temperature points within the system. The MCP9509/10 switches monitor temperature based on user-programmed resistance values. When the programmed temperature threshold is reached, the switches alert the system and the system can react accordingly.

User-programmable features, such as 2C and 10C (typical) switch hysteresis and output-structure configuration, mean the switches simplify designs and provide more flexibility to the designer.

Suited for battery-powered apps
The MCP9509 has a low static operating current of just 30?A and provides an open-drain output; while the MCP9510 has a static operating current of only 50?A and is offered in three different user-selectable output configurationsactive-low push pull, active-high push pull and active-low open-drain output with an internal 100k pull-up resistor.

The MCP9509/10 switches are well-suited for battery-powered applications in the industrial (power supplies, wireless handsets and meters, and multimeters); automotive (engine-temperature monitoring); medical (pharmaceutical storage-environment temperature control and refrigeration control); appliance (refrigerators and freezers); and consumer markets (PCs and peripherals).

The MCP9509 temperature switches are available in a 5-pin SOT-23 package; the MCP9510 in a 6-pin SOT-23 package. Both devices are priced at $0.61 each in 10,000-unit quantities.

- Clive Maxfield
Programmable Logic DesignLine

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