Product category: Analogue and Mixed Signal ICs
News Release from: Maxim Integrated Products | Subject: DS2781
Edited by the Electronicstalk Editorial Team on 23 January 2006
Fuel gauge chip keeps
watch over lithium cells
Operating directly from a 2.5 to 10V power source, the DS2781 is a stand-alone fuel gauge that calculates remaining capacity for single- and dual-cell Li+ and Li+ polymer battery packs
The device includes 16bit current measurement, and 11bit voltage and temperature measurements. On-chip nonvolatile memory stores cell characterisation data and application performance parameters. The DS2781 uses this measured and stored data to calculate the remaining battery capacity. Additionally, the on-chip algorithms and status reporting capabilities reduce the amount of interaction necessary between the device and the host processor.
This article was originally published on Electronicstalk on 23 January 2006 at 8.00am (UK)
Related stories
Integrated battery chip replaces three
Single-cell stand-alone fuel gauge integrates a single-cell Li-ion protector and SHA-1 authentication in a tiny 3 x 5mm TDFN package
Direct-conversion tuner cuts satellite BoM
The MAX2120 is ideal for DVB-S and free-to-air applications in which low cost and ease of use are key requirements
Software development is thus greatly simplified.
The DS2781 measures current by calculating the voltage drop across a low-value sense resistor.
Programming can compensate the current-sense resistor to correct for variation in its value over temperature, thus allowing use of lower cost sense resistors without compromising current measurement accuracy.
To improve current measurement accuracy even further, the DS2781 also provides automatic current-offset correction and user-programmable gain compensation.
Additionally, the DS2781 contains 40byte of EEPROM: 24byte to store the cell characterisation data and application parameters, and 16byte for use by the host system or pack manufacturer.
Communication between the device and the host is handled through a single-wire interface, reducing the number of pack contacts to one.
Typical applications for the DS2781 include digital video cameras, commercial two-way radios, industrial PDAs, handheld PC data terminals, and portable GPS navigation systems.
The device is available in a tiny lead-free 8-pin TSSOP package, small enough to fit on the side of a prismatic battery cell.
Prices start at $2.90 (1000-up, FOB USA).
• Maxim Integrated Products: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• NEW
• Electronicstalk Home Page
Related Business News
Taiwan stocks end down in biggest...
...drop in over 1 yr. Taipei, July 27 (Reuters) - Taiwan shares fell 4.22 percent on Friday to their lowest close in three weeks, marking their largest one-day percentage drop in more than a year, after a sell-off on Wall Street hurt big exporters such as TSMC .
Nippon Oil Aug refining seen flat, eyes Sudan crude
Tokyo, July 27 (Reuters) - Japan's top oil refiner Nippon Oil Corp. will keep its August processing volumes steady versus a year ago to meet summer gasoline demand and is seeking more Nile Blend crude to meet higher utility use.
Fluor Gains Eastman Chemical Gasification Plant Feed Work
Fluor Corporation announced today that it was selected by Eastman Chemical Company to provide front-end engineering and design work for a $1.6 billion gasification project along the Texas Gulf Coast.
Migao Corporation Secures Preferential Natural Gas Prices
Toronto, Ontario-- - Migao Corporation , a leading producer of specialty potash fertilizers for the Chinese market, is pleased to announce that it has negotiated preferential natural gas prices in Sichuan Province from China Petroleum & Chemical Corpora
South Korean envoy to meet Afghan...
...president over hostage crisis. A Seoul presidential envoy heading to Afghanistan will seek an urgent meeting with President Hamid Karzai to try to save 22 South Koreans kidnapped by the Taliban, officials said.
Search the Pro-Talk network of sites
