bq2118

The bq2118 Power Minder mini-board provides a complete and compact solution for charge and discharge counting of all types of battery chemistries, including NiCd, NiMH, or Li-Ion batteries. Designed for battery pack integration, the bq2118 incorporates a bq2018 Power Minder IC, supply voltage regulator, sense resistor, and backup capacitor on a small circuit board. The module provides direct connections for the positive and negative terminals of the series cells in the battery pack, and can fit in the crevice formed by two adjacent cells. The bq2118 allows a battery pack to be equipped easily with accuratecharge/dischargecountingelectronics.


Unitrode configures the bq2118 based on the information requested in Table 1. The configuration defines the battery chemistry, the number of series cells, and the charge/discharge current. Figure 1 shows how the mod-uleconnectstothecells.


A module development kit is also available for the bq2118. The bq2118B-KT includes one configured mod-uleandthefollowing:
1. An EV2200-18 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 bq2118 fromanystandardWindows3.1or95PC.