Power Electronics

PowerSmart Battery Monitoring Device

Microchip Technology’s PS402 is a smart battery system (SBS)-compliant, battery management integrated circuit (IC) that integrates all rechargeable battery monitoring functions for nickel metal hydride (NiMH) batteries on a single chip. With accuracy to within ± 1%, the PS402 provides the host system and user with valuable information that can be used for enhanced power management while providing the system's user with optimum predictability.

The PS402 is a fuel gauge IC that combines Microchip's RISC-based, mirocontroller with an advanced 15-bit analog-to-digital (A/D) converter. Accurate information from the battery helps enable the user to balance critical tasks with runtime while extending the life of the battery.

Microchip's Accuron technology refers to its advanced battery models and patented algorithms, which are stored in on-chip programmable memory. The PS402 incorporates Accuron Technology to provide a high-accuracy, cost-effective solution for NiMH applications.

In addition, the low-component count on a PS402-based solution reduces implementation cost and circuit board size. The PS402 minimizes space requirements through integration of a precision time base, regulator, and temperature sensor. The precise, on-chip time base eliminates the need for an external crystal while the PS402 derives its power directly from the battery, eliminating the need for an external regulator. To monitor battery temperature, the user can select an integrated temperature sensor or an external thermistor. The host communication uses a compliant SBData v1.1 command set over SMBus™ v1.1 2-wire interface.

For more information, visit www.microchip.com.

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