bq2150H

The bq2150H Power Gauge Module provides a complete and compact solution for capacity monitoring of Li-Ion battery packs. Designed for battery pack integration, the bq2150 incorporates a bq2150H Gas Gauge IC, a current sense resistor,and all other components necessary to accurately monitor and display the capacity of 2 to 5 series cells.


The bq2150L includes five LEDs to display remaining capacity in 20% increments of the learned capacity. The LEDsareactivatedwiththeonboardpush-buttonswitch.


Contacts are provided on the bq2150H for direct connection to the battery stack (BAT+, BAT-) and the serial communications port (HDQ). The RBI input provides backup power to the bq2150H in the event that the cells are removed or the battery is turned off. The bq2150H hasa1F capacitor onboard connected to RBI to supply backup power for about an hour. In battery packs that use high-side FETs to control the charge/discharge of the Li-Ion cells, the RBI input can be wired to a single cell to provide prolonged data retention times. The SD input allows an external signal (active low) to turn the bq2050H IC off to minimize internal current consumption of the battery pack and maximize storage life of the pack in the system. When turned off, the bq2150H is non-functional, and the RBI power source maintains register information. Please refer to the bq2050H data sheetforthespecificsontheoperationoftheGasGauge.


Unitrode configures the bq2150H based on the information requested in Table 1. The configuration defines thenumber of series cells, the nominal battery pack capacity, and the Li-Ion battery type (coke or graphite anode).Figure1showshowthemoduleconnectstothecells.


A module development kit is also available for the bq2150. The bq2150HB-KT or the bq2150HLB-KT includesoneconfiguredmoduleandthefollowing:
1) An EV2200-50H interface board that allows connection to the serial port of an AT-compatible computer.
2) Menu-driven software to display charge/discharge activity and to allow user interface to the bq2150H fromanystandardWindows3.1xor95PC.