The BQ2050HSN-A508G4 is a Li-ion Gas Gauge with high-speed 1-wire (HDQ) interface and 5 LED drivers. This IC monitors a voltage drop across a sense resistor connected in series between the negative battery terminal and ground to determine charge and discharge activity of the battery. Compensations for battery temperature, self-discharge and rate of discharge are applied to the charge counter to provide available capacity information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or "learned," in the course of a discharge cycle from full to empty. Nominal available capacity may be directly indicated using a five segment LED display. These segments are used to graphically indicate available capacity. The BQ2050H also supports a simple single-line bidirectional serial link to an external processor (common ground). The 5kB HDQ bus interface reduces communications overhead in the external microcontroller.
● Accurate measurement of available capacity in Li-ion batteries
● Provides a low-cost battery management solution for pack integration
● Complete circuit can fit in as little as 1/2 square inch of PCB
● 120µA Typical low operating current
● <100nA Data retention current
● Monitors and controls charge FET in Li-ion pack protection circuit
● Direct drive of remaining capacity LEDs
● Measurements automatically compensated for rate and temperature
● Green product and no Sb/Br
