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Dallas Semi rolls new fuel gauge

Posted: 26 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:dallas semiconductor? ds2782? fuel gauge?

Dallas Semiconductor augments its stand-alone fuel gauge product line with the DS2782 fuel gauge. The DS2782 uses the industry-standard 2-wire interface to communicate with the host, and calculates remaining capacity for Li+ and Li+-polymer batteries without need for host-side fuel-gauging algorithms, which, according to Dallas, greatly simplifies software development.

Though designed for single-cell applications, the DS2782 can accommodate multicell applications with a few circuit modifications.

The DS2782 measures several battery parameters including current, voltage and temperature. Built-in current-offset correction and user-programmable gain compensation improve current measurement accuracy. In addition, the device can be programmed to compensate the current-sense resistor to correct variation in its value over temperature. This enables the use of less accurate, lower cost sense resistors. Voltage measurements are 11-bit with a resolution of 4.88mV over a range of 0 to 4.992V. Temperature measurements are also 11-bits and have a resolution of 0.125C over the entire -40C to 85C operating range of the device.

Cell characterization data and application performance parameters used to calculate the remaining battery capacity are stored in 24 bytes of on-chip nonvolatile memory. An additional 16 bytes of nonvolatile memory are available for use by the host system or pack manufacturer.

Typical applications for the DS2782 include digital still cameras, subnotebook computers, handheld PC-data terminals and 3G multimedia wireless handsets.

The DS2782 is available in a tiny, 8-pin TSSOP package. Prices start at $2.60 (1,000-up, FOB USA).

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