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Preliminary
bq2118
Power MinderTM Mini-Board
Features
a a a a 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 - - - a 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: 1. An EV2200-18 interface board that allows connection to the serial port of an AT-compatible computer. 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 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. 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.
2.
Pin Descriptions
BAT+ BATHDQ PACKWAKE RBI VCC Battery positive/pack positive Battery negative Communications port Pack negative Wakeup output Register backup input bq2018 supply voltage
5/99
1
bq2118 Preliminary
Battery Pack Cells
BATbq2118 PACKPACKLoad PACK+ BAT+
Charger
FG2118MCD.eps
Figure 1. Module Connection Diagram
Table 1. bq2118 Module Configuration
Customer Name: ___________________________________________________________________________ Contact: _________________________________________ Phone: ______________________________
Address: _________________________________________________________________________________ _________________________________________________________________________________ Sales Contact: ____________________________________ Number of series battery cells Coke or graphite cell anode Battery pack capacity (mAh) Discharge rate into load (4.0A max) Charge rate (4.0A max) Phone: ______________________________
____________________ ____________________ ____________________ Min. ________ Avg. _________ Max. _________ ____________________ Date:________________________________
FAE Approval: _____________________________________
2
Preliminary bq2118
bq2118 Schematic
BAT+
d
R6 Q1
SST113
WAKE
1K
s
C5
0.01F
2
D2
BZX84C5V6
U1
1 2 3 4 REG VCC VSS HDQ WAKE SR1 SR2 RBI 8 7 6 5
R2 BATC2
0.1F 100K
VCC
VCC C1
0.1F
BQ2018
R1 R3
0.05 1W
PACKC3
100K
R5 HDQ
100
2
0.1F
D3 D1
BZX84C5V6
R4 RBI C4
0.1F
BAV99
100K
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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Copyright (c) 1999, Texas Instruments Incorporated

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