Texas Instruments BQ2023PW

Description
The bq2023 is an advanced battery monitoring IC that accurately measures the charge and discharge currents in rechargeable battery packs. It is intended for pack integration and contains all the necessary functions to form the basis for an accurate battery gas gauge in cellular phones, PDAs, or other portable products.

Features
Provides accurate state-of-charge information for rechargeable batteries
Enhances power and charge management in the system
Supply operation down to 2.4 V; ideal for single-cell Li-Ion or Li-Pol applications
Communicates over single-wire SDQ™ serial interface
Resolves signals down to 3.05 μVh
High-accuracy coulometric charge and discharge current integration
Differential current sense input
Automatic and continuous offset calibration and compensation
32 bytes of general-purpose RAM, 224 bytes of FLASH, and 8 bytes of secure ID ROM
Internal temperature sensor with 0.25°K resolution eliminates the need for an external thermistor
Programmable digital output port
Battery-pack removal detection input places the IC in the sleep mode when the system is not present
High-accuracy internal timebase eliminates external crystal oscillator
Low power consumption:
Operating: 40 μA
Sleep: 1.5 μA

Applications
Cellular phones
PDAs
Other portable products