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 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. 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