CMOS battery fuel gauges reduce power consumption
The LC709201F, LC709202F, and LC709203F ICs claims to combine high levels of accuracy with the industry’s lowest power consumption for competitive devices performing this function. The devices also reduce component count and system cost, as, unlike competing devices, they do not require a current sensing resistor to effect a solution.
ON Semiconductor’s new battery monitor devices reduce measurement errors to below ± 5 percent (for LC709201F and LC709202F) or below ± 2.8 percent (LC709203F) by employing a unique correction technology to ascertain temperature and voltage. Low current consumption minimizes the drain on battery power helping to extend time between charging cycles. This is enhanced further on the LC709202F and LC709203F by a sub 0.2 µA power saving sleep mode feature. In addition, the LC709203F also has a 2 µA ECO Mode.
Key features of the LC709201F include an I2C interface and communications pin, plus further pins for battery temperature reading control, analog voltage input for battery temperature, reset, test and power supply. The LC709202F and LC709203F add an alert function – which is configurable on the LC709203F – to indicate low relative state of charge (RSOC) and battery voltage and external alarm / interrupt for low battery warning. Additionally, the LC709203F can accommodate any emerging Lithium Ion battery chemistry type by a table re-writing system.
Packaging and Pricing
The LC709201F and LC709202F are offered in Pb-free VCT-16 packages, and the LC709203F in Pb-free VDFN-8 and WLCSP-9 packages. Pricing for the devices ranges from $0.66 to $2.00 per unit in quantities for 2,000 units.
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