Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: DS2782
Edited by the Electronicstalk Editorial Team on 20 May 2005
Fuel gauge chip simplifies software
development
Dallas Semiconductor has augmented its stand-alone fuel gauge product line with the DS2782 fuel gauge.
Dallas Semiconductor has augmented its stand-alone fuel gauge product line with the DS2782 fuel gauge The DS2782 uses the industry-standard two-wire interface to communicate with the host
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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It calculates remaining capacity for Li+ and Li+-polymer batteries without need for host-side fuel-gauging algorithms, thus greatly simplifying software development.
Although it is optimised for single-cell applications, it can accommodate multicell applications with a few circuit modifications.
Typical applications for the DS2782 include digital still cameras, subnotebook computers, handheld PC-data terminals, and 3G multimedia wireless handsets.
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.
Also, 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 11bit with a resolution of 4.88mV over a range of 0 to 4.992V.
Temperature measurements are also 11bit and have a resolution of 0.125 degrees over the entire -40 to +85C operating range of the device.
Cell characterisation data and application performance parameters used to calculate the remaining battery capacity are stored in 24 bytes of on-chip nonvolatile memory.
An additional 16byte of nonvolatile memory are available for use by the host system or pack manufacturer.
The DS2782 is available in a tiny, 8-pin TSSOP package, small enough to fit on the side of a prismatic battery cell.
Prices start at $2.60 (1000-up, FOB USA).
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