Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: DS2780
Edited by the Electronicstalk Editorial
Team on 06 December 2004
Lithium cell fuel gauge chip does the
lot
The DS2780 is a stand-alone fuel gauge that calculates remaining capacity for Li-ion and Li-ion polymer batteries without need for host-side fuel-gauging algorithms.
The DS2780 is a stand-alone fuel gauge that calculates remaining capacity for Li-ion and Li-ion polymer batteries without need for host-side fuel-gauging algorithms Thus, the DS2870 greatly simplifies software development
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The device provides 16bit current measurement, 11bit voltage and temperature measurements, and on-chip nonvolatile memory to store cell characterisation data and application performance parameters.
The DS2780 uses this measured and stored data to calculate the remaining capacity.
Additionally, the DS2780's on-chip algorithms and status-reporting capabilities automatically send alerts to the host processor.
This reduces the DS2780's amount of interaction with the processor and frees the processor for other operations.
Current is measured in the DS2780 by calculating the voltage drop across a low-value sense resistor.
The device can be programmed to compensate the current-sense resistor to correct for variation in its value over temperature.
This allows the use of lower cost sense resistors without compromising current measurement accuracy.
To improve current-measurement accuracy even further, the DS2780 also includes automatic current-offset correction and user-programmable gain compensation.
Additionally, the DS2780 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 1-Wire interface, which minimises the number of pack contacts.
Typical applications for the DS2780 include digital stills cameras, subnotebook computers, handheld PC data terminals and 3G multimedia wireless handsets.
The device is available in a tiny 8-pin TSSOP, 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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