Preliminary bq2150H Li-Ion Power Gauge™ Module Features ä Complete bq2050H Power Gauge solution for Li-Ion battery packs ä Battery information available over a single-wire (HDQ) bidirectional serial port ä Control signals to enhance pack protection ä Battery state-of-charge monitoring for 2- to 5-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 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. General Description A module development kit is also available for the bq2150. The bq2150HB-KT or the bq2150HLB-KT includes one configured module and the following: The bq2150H 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 bq2150H Gas Gauge IC, a current sense resistor, and all other components necessary to accurately monitor and display the capacity of 2 to 5 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 EV2200-50H 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 bq2150H from any standard Windows 3.1x or 95 PC. Pin Descriptions Contacts are provided on the bq2150H for direct connection to the battery stack (BAT+, BAT-) and the serial communications port (HDQ). The RBI input provides backup power to the bq2150H in the event that the cells are removed or the battery is turned off. The bq2150H 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 bq2050H 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 bq2150H is non-functional, and the RBI power source maintains register information. Please refer to the bq2050H data sheet for the specifics on the operation of the Gas Gauge. Unitrode configures the bq2150H based on the information requested in Table 1. The configuration defines the 10/97 1 P1 HDQ/Serial Communications port P2 PSTAT/Protector status input 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 P9 CFC/Charge FET control output bq2150H Preliminary Battery Pack Cells P8 bq2150H P3 P7 PACK- PACK+ Load Charger FG2150H1.eps Figure 1. Module Connection Diagram Table 1. bq2150H Module Configuration Customer Name: ___________________________________________________________________________ Contact: _________________________________________ Phone: ______________________________ Address: _________________________________________________________________________________ _________________________________________________________________________________ Sales Contact: ____________________________________ Phone: ______________________________ Number of series battery cells (2-5) ____________________ Coke or graphite cell anode ____________________ Battery pack capacity (mAh) ____________________ Discharge rate into load (A) min. ________ avg. _________ max. _________ Charge rate ____________________ Self-discharge compensation (Y/N) ____________________ LEDs and switch (Y/N) ____________________ FAE Approval: __________________________________ 2 Date: _______________________________ Preliminary bq2150H bq2150H Schematic VCC VCC R11 BAT+ 1 100 R23 D1 R16 330 100K R19 100K R17 100K R14 R12 100K 2 100K GREEN C1 GREEN D4 GREEN D5 R22 Q1 2N7002 P9 CFC GREEN 4 BAV99 R25 PSTAT 1 2 1 16 15 14 13 12 11 10 9 D7 100 4 4 R26 R1 1 R20 R18 R15 R13 100K 100K 100K 100K 100K 1 R7 C4 0.1UF 2 1 2 2 4 MOMENTARY R4 BAT- 2 1 20K C3 0.1UF 1 See Table 1 for resistor values. R8 3 R9 3 R10 3 PACK1 GND 1 For 1 cell configuration install R11 and R9, for greater than 1 cell configuration install Q1, D6, and R2. 3 Sense resistor value depends on application. 4 For PSTAT function, install R25 and D10. If not using PSTAT, install 0 jumper at R26. 2150H/9-16-97/A 3 P5 1UF 3 NOT_USED 2 RBI 1 S1 R5 R27 P1 C5 1 VCC 1 10K BAV99 1% TABLE 1 R7 # OF CELLS R2 R6 2 200K 698K 100K 3 300K 1.1M 100K 4 499K 1.5M 100K 5 1M 1.3M 69.8K HDQ 1 D8 0.1UF 2 100 1% 3 R24 P2 BAV99 1 R6 C2 1 P4 BAV99 R2 LCOM VCC REF SEG1 SEG2 PSTAT HDQ SEG3 RBI SEG4 SB SEG5 CFC DISP SR VSS P3 D10 2 D6 BQ2050H 330 1 U1 1 2 3 4 5 6 7 8 GREEN SD 2 100K 2 0.1UF D3 330 R3 BZX84C5V1 VCC D2 R21 D9 2 1 2 P8 P7 P6 bq2150H Preliminary bq2150H Board Ordering Information bq2150H 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 Device: Li-Ion Power Gauge Module Notes: 1. Requires configuration sheet (Table 1) 2. Example production part number: bq2150HLB-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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