bq2150 Li-Ion Power Gauge™ Module Features ä Complete bq2050 Power Gauge solution for Li-Ion battery packs ä Battery information available over a single-wire bidirectional serial port ä Battery state-of-charge monitoring for 2- to 4-cell series applications ä On-board regulator allows direct connection to the battery ä “L” version includes push-button activated LEDs to display state-of-charge information ä Nominal capacity pre-configured ä Compact size for battery pack integration A module development kit is also available for the bq2150. The bq2150B-KT or the bq2150LB-KT includes one configured module and the following: General Description The bq2150 Power Gauge Module provides a complete and compact solution for capacity monitoring of Li-Ion battery packs. Designed for battery pack integration, the bq2150 incorporates a bq2050 Gas Gauge IC, a current sense resistor, and all other components necessary to accurately monitor and display the capacity of 2 to 4 series cells. The bq2150L includes five LEDs to display remaining capacity in 20% increments of the learned capacity. The LEDs are activated with the onboard push-button switch. 1) An 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 bq2050 from any standard DOS PC. 3) Source code for the TSR. Pin Descriptions Contacts are provided on the bq2150 for direct connection to the battery stack (BAT+, BAT-) and the serial communications port (DQ). The RBI input provides backup power to the bq2050 in the event that the cells are removed or the battery is turned off. The bq2150 has a 1µF capacitor onboard connected to RBI to supply backup power for about an hour. In battery packs that use high-side FETs to control the charge/discharge of the Li-Ion cells, the RBI input can be wired to a single cell to provide prolonged data retention times. The SD input allows an external signal (active low) to turn the bq2050 IC off to minimize internal current consumption of the battery pack and maximize storage life of the pack in the system. When turned off, the bq2050 is nonfunctional, and the RBI power source maintains register information. Please refer to the bq2050 data sheet for the specifics on the operation of the gas gauge. Unitrode configures the bq2150 based on the information requested in Table 1. The configuration defines the number of series cells, the nominal battery pack capacity, and the Li-Ion battery type (coke or graphite anode). Figure 1 shows how the module connects to the cells. 5/99 B 1 P1 DQ/Serial Communications port P2 No connect P3 BAT+/Battery positive/pack positive P4 SD/Shutdown P5 RBI/Register backup input P6 GND/Ground P7 PACK-/Pack negative P8 BAT-/Battery negative bq2150 Battery Pack Cells P8 bq2150 P7 P3 PACK+ PACKLoad Charger FG-9611 Figure 1. Module Connection Diagram Table 1. bq2150 Module Configuration Customer Name: ___________________________________________________________________________ Contact: _________________________________________ Phone: ______________________________ Address: _________________________________________________________________________________ _________________________________________________________________________________ Sales Contact: ____________________________________ Phone: ______________________________ Number of series battery cells (2-4) ____________________ Coke or graphite cell anode ____________________ Battery pack capacity (mAh) ____________________ Discharge rate into load (3.0A max) Min. ________ Avg. _________ Max. _________ Charge rate (3.0A max) ____________________ Nominal Available Capacity after reset (Programmed Capacity or Zero) ____________________ Self-discharge compensation (Y/N) ____________________ LEDs and switch (Y/N) ____________________ FAE Approval: _____________________________________ 2 Date:________________________________ bq2150 bq2150 Schematic Note: Schematic shows components that may not be placed on the board, depending on the configuration. 3 bq2150 bq2150 Board 4 bq2150 Absolute Maximum Ratings Symbol Parameter Minimum Maximum Unit Conditions VCC Relative to VSS -0.3 +7.0 V bq2050 All other pins Relative to VSS -0.3 +7.0 V bq2050 PSR Continuous sense resistor power dissipation - 3 W Thru-hole sense resistor - 1 W Surface-mount sense resistor ICHG Continuous charge/discharge current - 3.0 A TOPR Operating temperature 0 +70 °C TSTR Storage temperature -40 +85 °C Note: Commercial Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability. DC Electrical Characteristics (TA = TOPR) Symbol Parameter Minimum Typical Maximum - 4 Unit Conditions/Notes NumCell Number of series cells in battery pack 2 BAT+ Positive terminal of pack GND BAT- Negative terminal of pack GND - 0.3 - GND+2.0 V ICC Supply current at BAT1P terminal (no external loads) - 200 300 µA RDQ Internal pull-down 500k - - Ω1 IOL Open-drain sink current DQ - - 5.0 mA1 VOL Open-drain output low, IOL DQ - - 0.5 V1 VIHDQ DQ input high 2.5 - - V1 VILDQ DQ input low - - 0.8 V1 VOS Voltage offset - - 150 µV1 Note: NumCell * 3.6V NumCell * 5.4V 1. Characterized on PCB, IC 100% tested. 5 V IOL < 5mA bq2150 DC Voltage Thresholds (TA = TOPR) Symbol Parameter Minimum Typical Maximum Unit 1.45 1.47 1.49 V Notes BAT+/(2*NumCell)1 VEDVF Final empty warning VEDV1 First empty warning 1.50 1.52 1.55 V BAT+/(2*NumCell)1 VMCV Maximum single-cell voltage 2.20 2.25 2.30 V BAT+/(2*NumCell)1 VSRO Sense range -300 - +2000 mV SR, VSR + VOS2 VSRQ Valid charge 210 - - µV VSR + VOS 2, 3 VSRD Valid discharge - - -200 µV VSR + VOS 2, 3 Notes: 1. At SB input of bq2050 2. At SR input of bq2050. 3. Default value; value set in DMF register. Data Sheet Revision History Change No. Page No. 1 2 Updated Table 1 to include 3.0A limit 1 5 Added 3.0A maximum continuous charge/discharge current specification Note: Description Change 1 = May 1999 B changes from April 1999. Ordering Information bq2150 B — Customer Code: Blank = Sample or Pre-production1 KT = Evaluation system XXX = Customer-specific; assigned by Unitrode2 Package Option: B = Board-level product LED Option: L = LEDs plus switch Blank = No LEDs or switch Device: Li-Ion Power Gauge Module Notes: 1. Requires configuration sheet (Table 1) 2. Example production part number: bq2150LB-001 6 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. 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