Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: DS2784
Edited by the Electronicstalk Editorial Team on 09 August 2007
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.
The DS2784 from Maxim Integrated Products is billed as the industry's first single-cell stand-alone fuel gauge to integrate a single-cell Li-ion protector and SHA-1 authentication in a tiny 3 x 5mm TDFN package Previously, three separate ICs would have been required to give the same functionality that the DS2784 provides
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Small enough to fit on the side of a prismatic battery cell, the DS2784 is ideal for space-sensitive portable applications that use single-cell Li-ion battery packs, including mid-/high-end phones, smartphones, PDAs, portable navigation/GPS devices, digital still and video cameras, and VoIP phones.
The DS2784's fuel gauge estimates available capacity based on coulomb count, discharge rate, temperature, and cell characteristics.
To reduce development effort and time to market, it combines a precision, analogue front-end for measuring current and voltage with a proven, embedded fuel-gauge algorithm.
On-chip temperature measurements eliminate the need for a thermistor in the battery pack.
Additionally, the DS2784 can use temperature data to enable gain and temperature-coefficient compensation in the current measurement, thereby allowing the use of a low-cost current-sense resistor.
The single-cell Li-ion protector monitors for cell overvoltage, undervoltage, overcurrent, and short-circuit conditions.
Thresholds are user-programmable and can be locked to prevent accidental overwrites.
The DS2784's built-in charge pump enables cell protection to be implemented with high-side N-channel FETs.
This configuration maximises battery life by reducing the on-resistance of the protection FET as the cell voltage decreases.
It also allows the host system to communicate with the battery pack, even during a fault condition.
The integrated, secure challenge-response authentication algorithm provides exceptional protection against the counterfeiting of battery packs, thereby increasing safety and reliability for the end-user, as well as protecting and enhancing the reputation of the product manufacturer.
It utilises a SHA-1 algorithm with a 64bit secret and communicates with the host over the DS2784's 1-Wire interface.
The DS2784 enables a battery pack to meet IEEE1725-2006 safety, identification, and authentication requirements.
It is available in a lead-free 3 x 5mm 14-pin TDFN package.
Prices start at US $2.94 (1000-up).
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