Power_Minder_?_Mini-Board
Features
Complete and compact charge/discharge counter
Combines the bq2018, voltage regulator, sense
resistor, and backup capacitor on a single PCB
Communicates charge/discharge information to a
host with a single-wire interface
Designed for battery pack integration
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
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.
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.
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
BAT+
Battery positive/pack positive
BAT-
Battery negative
HDQ
Communications port
PACK-
Pack negative
WAKE
Wakeup output
RBI
Register backup input
V
CC
bq2018 supply voltage
1
Power MinderTM Mini-Board
Preliminary
bq2118
5/99
2
bq2118
Preliminary
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: _____________________________________
Date:________________________________
Table 1. bq2118 Module Configuration
FG2118MCD.eps
Battery Pack
BAT-
PACK-
BAT+
bq2118
Load
Charger
Cells
PACK+
PACK-
Figure 1. Module Connection Diagram
3
RBI
SR2
SR1
WAKE
HDQ
VSS
VCC
REG
BQ2018
U1
1
2
3
4
5
6
7
8
C1
VCC
SST113
Q1
BAT+
BZX84C5V6
D1
2
HDQ
BZX84C5V6
D2
2
100
R5
C4
C2
C3
BAV99
D3
100K
d
s
R4
RBI
PACK-
BAT-
1W
0.05
R1
100K
R3
100K
R2
WAKE
1K
R6
VCC
0.01
F
0.1
F
0.1
F
0.1
F
0.1
F
C5
2018typAp.eps
bq2118 Schematic
Preliminary
bq2118
4
bq2118 Board
bq2118
Preliminary
bq2118
B XXX
Package Option:
B = Board-level product
Device:
Power Minder Mini-Board
Customer Code:
Blank = Sample or Pre-production
1
KT = Evaluation system
XXX = Customer-specific; assigned by Unitrode
2
Ordering Information
Notes:
1.
Requires configuration sheet (see Table 1)
2.
Example production part number: bq2118B-001
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1999, Texas Instruments Incorporated
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