Preliminary bq2145 Smart Battery Module with LEDs Features ä Complete smart battery solution for NiCd, NiMH, and Li-Ion battery packs ä Based on the bq2945 Gas Gauge IC ä Accurate measurement of available battery capacity ä Designed for battery pack integration: ä – Measures only 2.5 (L) x 0.7 (W) inches – I ncl ud e s G a s G aug e I C, c o nf ig u r a t ion EEPROM, and sense resistor – Five onboard state-of-charge LEDs with push-button activation – Low operating current for minimal battery drain A module development kit is also available for the bq2145. The bq2145B-KT or the bq2145LB-KT includes one configured module and the following: Critical battery information available over two-wire serial port 1) An EV2200-45 interface board that allows connection to the serial port of any AT-compatible computer. 2) Menu-driven software to display charge/discharge activity and to allow user interface to the Gas Gauge IC and serial E2PROM from any standard Windows 95 or 3.1x PC. General Description The bq2145 Smart Battery Module provides a complete solution for the design of intelligent battery packs. The bq2145 uses the SMBus protocol and supports Smart Battery Data commands in the SMB/SBD specifications. Designed for battery pack integration, the bq2145 combines the bq2945 Gas Gauge IC with a serial EEPROM on a small printed circuit board. The board includes all the necessary components to accurately monitor battery capacity and communicate critical battery parameters to the host system or battery charger. The bq2145 also includes five LEDs. The push-button switch activates the LEDs to show remaining battery capacity in 20% increments. Pin Descriptions Contacts are provided on the bq2145 for direct connection to the battery stack (B+, B-) and the two-wire interface (C, D). Please refer to the bq2945 data sheet for specific information on the operation of the Gas Gauge and communication interface. Unitrode configures the bq2145 based on the information requested in Table 1. The configuration defines the pack voltage, capacity, and chemistry and charge control parameters. The Smart Battery Module uses the onboard sense resistor to track charge and discharge activity of the battery pack. Figure 1 shows how the module connects to the cells. 5/99 1 B+ BAT+/Battery positive/Pack positive P- PACK-/Pack negative C SMBC/Communications clock D SMBD/Serial data B- BAT-/Battery negative CP2 Control pin 2 CP1 Control pin 1 bq2145 Preliminary Battery Pack Cells Bbq2145 B+ PPACK- PACK+ Load Charger FG2145-1.eps Figure 1. Module Connection Diagram 2 Preliminary bq2145 Table 1. bq2145 Module Configuration Customer Name: ______________________________________________________________________________________________ Contact: _______________________________________________________ Phone:____________________________ Address:________________________________________________________________________________________________ Sales Contact: __________________________________________________ Phone: ____________________________ Board Configuration LEDs and switch Display mode Discharge rate (3.0A max.) Duration at max. discharge Number of series cells ________________ ________________ Min ____________ ________________ ________________ Yes or No Relative or Absolute Avg ____________ Max ___________ EEPROM Configuration Remaining time alarm (min) Remaining capacity alarm (mAh) Charging voltage (mV) Design cpaacity (mAh) Design voltage (mV) Manufacturer date Serial number Fast-charging current (mA) Maintenance charging current (mA) Li-Ion taper current (mA) Maximum overcharge (mAh) Maximum temperature (°C) ∆T/∆t (°C/min) Fast-charge efficiency (%) Maintenance charge efficiency (%) Self-discharge rate (%/day) EDV1 (mV) EDVF (mV) Hold-off timer for ∆T/∆t (sec.) Manufacturer name Device name Chemistry Manufacturer data FAE Approval _______________ _______________ Sets the low time alarm level Sets the low capacity alarm level _______________ _______________ _______________ _______________ _______________ _______________ Typical Values NiMH Li-Ion 10 min 10 min C/10 C/10 _______________ Sets the requested charging voltage 65535 4.1V/cell Defines the battery pack capacity 3000 3600 Defines the battery pack voltage 12000 10800 Battery pack manufacturer date mm/dd/yy mm/dd/yy Battery pack serial number 0-65535 0-65535 Sets the requested charging current 1C 1C Sets the requested maintenance charging current C/20 0 Sets the upper limit for charge termination NA C/10 Sets the maximum amount of overcharge 256mAh 128mAh Sets the maximum charge temperature 61°C 61°C Sets the termination rate 3°C/3min 4.6°C/20s _______________ _______________ Sets the fast-charge efficiency factor Sets the maintence charge efficiency factor _______________ _______________ _______________ _______________ Sets the batterys self-discharge rate Sets the initial end-of-discharge warning Sets the final end-of-discharge warning _______________ _______________ _______________ _______________ Sets the hold off period for ∆T/∆t termination _______________ Programs manufacturer’s name (11 char. max) _______________ Programs device name (7 char. max) _______________ Programs pack’s chemistry (7 char. max) _______________ Open field (5 char. max) ____________________________________ 3 95% 80% 100% 100% 1.5%/day 0.2%/day 1.05V/cell 3.0V/cell 1.0V/cell 2.8V/cell 180s 320s bq bq bq36 bq202 NiMH LION 2040 2040 Date: ____________ bq2145 Preliminary bq2145 Schematic R12 10K 10K 2 16 15 14 13 12 11 10 9 1% 1 R17 100K 1 330 2 R3 1 2 1 1 1 C1 VCC R8 0.1UF 1 2 2 2 1 2 1 1 2 2 330 2 2 COLOR 1 1 R6 1 2 2 3 1 1 100 BAV99 1 1 1 C 2 D2 D5 SMBC 2 3 D6 D4 CP1 D7 4 DISPLAY BAV99 COLOR 1 R9 COLOR D3 CP2 2 100 COLOR 330 R15 3 COLOR 330 R2 1 1 1 1% 2 2 1 R4 0.1UF 1 330 R14 D1 1 TP4 TP3 1 1 1 R10 100K 2 SMBD 1 BAT1 2 0.05 3W PACK1 4 D B- R1 0.1UF 2 2 1 C3 1 R7 100 LiION 2 1% OPTIONAL SW1 1 1 2 2 100 R16 1 C4 1 2 2 2 1 P- NiMH 3 B+ R5 bq2945 C5 1 3 2 R11 U1 VCC VOUT SEG1 REF SEG2 SMBC SEG3 SMBD SEG4 CP2 SEG5 SB CPI DISP VSS SR BAT+ 1 3 1 1 0.1UF 1 2 3 4 5 6 7 8 1 Q2 2 1 R13 1 BZX84C6V2 1 1 1 2 C2 TP7 VCC TP1 VCC D9 2 1 2 TP2 2 8 VCC 7 WP 6 SCL 5 SDA A0 A1 A2 VSS 24LC01 BSS84ZX 1 1 2 3 4 2 100 BAW56 U2 BAV99 Q1 2N7002 2 3 D10 1 D8 OPTIONAL 6.2V VCC R18 1 TP5 1 3 1 SEE CHART 1 FOR RESISTOR VALUES. TP6 1 CHART 1 R4 # OF CELLS R5 R11 301K 86.5K 100K 2 499K 909K 100K 3 698K 909K 100K 4 6 8 9 10 12 499K 698K 806K 909K 909K 162K 402K 604K 909K 1M 100K 100K 100K 100K 86.5K Preliminary bq2145 bq2145 Board 5 bq2145 Preliminary Ordering Information bq2145 B – XXX 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: Smart Battery Module with LEDs Notes: 1. Requires configuration sheet (see Table 1) 2. Example production part number: bq2145LB-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. 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