Texas Instruments BQ2019PWG4

Description
The bq2019 advanced battery-monitoring IC accurately measures the charge and discharge currents in a rechargeable battery pack. In pack integration, the bq2019 is the basis of a comprehensive battery-capacity management system in portable applications such as cellular phones, PDAs, or other portable products.
The bq2019 works with the host controller in the portable system to implement the battery management system. The host controller interprets the bq2019 data and communicates meaningful battery data to the end-user or power-management system.
The bq2019 provides 64 bytes of general-purpose flash memory, 8 bytes of ID ROM, and 32 bytes of flash-backed RAM for data storage. The nonvolatile memory can maintain formatted battery-monitor information, identification codes, warranty information, or other critical battery parameters when the battery is temporarily shorted or deeply discharged.

Features
High-Accuracy Coulometric Charge and Discharge Current Integration With Offset Calibration
32 Bytes of General-Purpose RAM
96 Bytes of Flash (Including 32 Bytes of Shadow Flash)
8 Bytes of ID ROM
Internal Temperature Sensor Eliminates the Need for an External Thermistor
Multifunction Digital Output Port
High-Accuracy Internal Timebase Eliminates External Crystal Oscillator
Low Power Consumption
Operating: <80 μA
Sleep: <1.5 μA
Single-Wire HDQ Serial Interface

Applications
Ideal for Single-Cell Li-Ion or 3-Cell NiMH Applications