BQ2050SND119TR

The BQ2050SND119TR is one member of the BQ2050 series.The bq2050 Lithium Ion Power Gauge(TM) IC is intended for battery-pack or in-system installation to maintain an accurate record of available battery capacity. The 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 of BQ2050SND119TR and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available capacity information across a wide range of operating conditions.Battery capacity of BQ2050SND119TR is automatically recalibrated, or"learned," in the course of a discharge cycle from full to empty.

Features of the BQ2050SND119TR are:(1)conservative and repeatable measurement of available capacity in Lithium Ion rechargeable batteries; (2)designed for battery pack integration:120A typical operating current,small size enables imple-mentations in as little as 1/2 square inch of PCB; (3)integrate within a system or as a stand-alonedevice:display capacity via single-wire serial communication port or direct drive of LEDs; (4)measurements compensated for current and temperature;(5)self-discharge compensation using internal temperature sensor; (6)16-pinnarrowSOIC.

The absolute maximum ratings of the BQ2050SND119TR can be summarized as:(1)relative to Vss(all other pins):-0.3 to 7.0V;(2)operating temperature:-40 to 85;(3)relative to Vss(ref):-0.3 to 8.5V;(4)relative to Vss(Vsr):-0.3 to 7.0V.The final section is used to stop the transmission by returning the DQ pin to a logic-high state by at least a period, tSSU, after the negative edge used to start communication. The final logic-high state should be held until a period, tSV, to allow time to ensure that the bit transmission was stopped properly.The timings for data and break communication are given in the serial communication timing specification and illustration sections.The interface uses a command-based protocol, where the host processor sends a command byte to the bq2050.The command directs the bq2050 to either store the next eight bits of data received to a register specified by the command byte or output the eight bits of data specified by the command byte.