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Less than 0.5 square inches
Small size allows it to fit in the crevice formed
by two adjacent cells
Low operating current
Direct connections for the pack cells and
communications port
A module development kit is also available for the
bq2118. The bq2118B-KT includes one configured mod-
ule and the following:
1.
An EV2200-18 interface board that allows connec-
tion to the serial port of an AT-compatible com-
puter.
Menu-driven software to display charge/discharge
activity and to allow user interface to the bq2118
from any standard Windows 3.1 or 95 PC.
General Description
The bq2118 Power Minder mini-board provides a com-
plete 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 mod-
ule provides direct connections for the positive and nega-
tive 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
accurate charge/discharge counting electronics.
Unitrode configures the bq2118 based on the informa-
tion 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-
ule connects to the cells.
2.
Pin Descriptions
BAT+
BAT-
HDQ
PACK-
WAKE
RBI
V
CC
Battery positive/pack positive
Battery negative
Communications port
Pack negative
Wakeup output
Register backup input
bq2018 supply voltage
5/99
1
1
2
3
4
5
