Microchip has expanded its battery management product line with an integrated, reprogrammable, fuel-gauge for two, three, and four series cell lithium-ion and lithium-polymer, or six to 12-cell nickel metal hydride and nickel cadmium applications.
The PS501 is a smart battery system (SBS) compliant device that provides precise predictions of battery capacity. It offers cell monitoring for safety conditions along with end of discharge control, thereby maximising battery life and runtime.
The PS501 battery manager IC combines Microchip's PIC18 microcontroller with its Accuron algorithm stored in 16 KB of on-chip Flash. It offers a low operating current of 150 μA, and when not in use, enters low power sleep mode using less than 1 μA.
Peripheral features also include a 16-bit sigma-delta integrating ADC and application-optimised mixed-signal circuitry. This enables precision measurement of battery current, temperature and voltage as well as direct connection of up to four series cell lithium-ion or lithium-polymer packs, says the company. EEPROM provides storage of customisable and 'learned' battery parameters. The PS501 integrates an accurate oscillator eliminating the need for an external crystal.
12 general-purpose pins support charge and safety control or user programmable digital I/O. Eight of them can be used as LED drivers and two are open drain for direct FET drive. Communication with the host is via SMbus protocol and development systems are available. The device is available in a Pb-free 28-pin SSOP package.
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