TI BQ2118MODULE Power minderâ ¢ mini-board Datasheet

Preliminary
bq2118
Power Minder™ Mini-Board
Features
ä
Complete and compact charge/discharge counter
ä
Combines the bq2018, voltage regulator, sense
resistor, and backup capacitor on a single PCB
ä
Communicates charge/discharge information to a
host with a single-wire interface
ä
Designed for battery pack integration
ä
–
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 module and the following:
General Description
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
accurate charge/discharge counting electronics.
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
from any standard Windows 3.1 or 95 PC.
Pin Descriptions
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 module connects to the cells.
5/99
1
BAT+
Battery positive/pack positive
BAT-
Battery negative
HDQ
Communications port
PACK-
Pack negative
WAKE
Wakeup output
RBI
Register backup input
VCC
bq2018 supply voltage
bq2118 Preliminary
Battery Pack
Cells
BATbq2118
BAT+
PACKPACK-
PACK+
Load
Charger
FG2118MCD.eps
Figure 1. Module Connection Diagram
Table 1. bq2118 Module Configuration
Customer Name: ___________________________________________________________________________
Contact: _________________________________________
Phone: ______________________________
Address: _________________________________________________________________________________
_________________________________________________________________________________
Sales Contact: ____________________________________
Phone: ______________________________
Number of series battery cells
____________________
Coke or graphite cell anode
____________________
Battery pack capacity (mAh)
____________________
Discharge rate into load (4.0A max)
Min. ________ Avg. _________ Max. _________
Charge rate (4.0A max)
____________________
FAE Approval: _____________________________________
2
Date:________________________________
Preliminary bq2118
bq2118 Schematic
BAT+
R6
d
WAKE
Q1
1K
SST113
s
C5
2
D2
BZX84C5V6
U1
0.01µF
1
2
3
4
VCC
REG
VCC
VSS
HDQ
VCC
WAKE
SR1
SR2
RBI
R2
8
7
6
5
BATC2
100K
BQ2018
R1
0.1µF
C1
R3
0.1µF
0.05
1W
PACK100K
C3
R5
HDQ
0.1µF
100
D3
2
D1
R4
BZX84C5V6
RBI
C4
BAV99
100K
0.1µF
2018typAp.eps
3
bq2118 Preliminary
bq2118 Board
Ordering Information
bq2118
B – XXX
Customer Code:
Blank = Sample or Pre-production1
KT = Evaluation system
XXX = Customer-specific; assigned by Unitrode2
Package Option:
B = Board-level product
Device:
Power Minder Mini-Board
Notes:
1. Requires configuration sheet (see Table 1)
2. Example production part number: bq2118B-001
4
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