Texas Instruments BQ2145MODULE, BQ2145LMODULE, BQ2145LB-KT, BQ2145B-KT Datasheet
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:
–
Measures only 2.5 (L) x 0.7 (W) inches
–
Includes Gas Gauge IC, configuration
EEPROM, and sense resistor
–
Five onboard state-of-charge LEDs with
push-button activation
–
Low operating current for minimal battery
drain
ä Critical battery information available over two-wire
serial port
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 com
bines 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 in
cludes five LEDs. The push-button switch activates the
LEDs to show remaining battery capacity in 20% incre
ments.
Contacts are provided on the bq2145 for direct connec
tion to the battery stack (B+, B-) and the two-wire inter
face (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 informa
tion requested in Table 1. The configuration defines the
pack voltage, capacity, and chemistry and charge control
parameters. The Smart Battery Module uses the on
board sense resistor to track charge and discharge activ
ity of the battery pack. Figure 1 shows how the module
connects to the cells.
A module development kit is also available for the
bq2145. The bq2145B-KT or the bq2145LB-KT includes
one configured module and the following:
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 E
2
PROM from any standard
Windows 95 or 3.1x PC.
Pin Descriptions
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
1
Smart Battery Module with LEDs
Preliminary
bq2145
5/99
2
FG2145-1.eps
Battery Pack
B-
P-
B+bq2145
Load
Charger
Cells
PACK+PACK-
Figure 1. Module Connection Diagram
bq2145
Preliminary
3
Customer Name: ______________________________________________________________________________________________
Contact: _______________________________________________________ Phone:____________________________
Address:________________________________________________________________________________________________
Sales Contact: __________________________________________________ Phone: ____________________________
Board Configuration
LEDs and switch ________________ Yes or No
Display mode ________________ Relative or Absolute
Discharge rate (3.0A max.) Min ____________ Avg ____________ Max ___________
Duration at max. discharge ________________
Number of series cells ________________
EEPROM Configuration Typical Values
NiMH Li-Ion
Remaining time alarm (min) _______________ Sets the low time alarm level 10 min 10 min
Remaining capacity alarm
(mAh)
_______________ Sets the low capacity alarm level C/10 C/10
Charging voltage (mV) _______________ Sets the requested charging voltage 65535 4.1V/cell
Design cpaacity (mAh) _______________ Defines the battery pack capacity 3000 3600
Design voltage (mV) _______________ Defines the battery pack voltage 12000 10800
Manufacturer date _______________ Battery pack manufacturer date mm/dd/yy mm/dd/yy
Serial number _______________ Battery pack serial number 0-65535 0-65535
Fast-charging current (mA) _______________ Sets the requested charging current 1C 1C
Maintenance charging
current (mA) _______________
Sets the requested maintenance charging
current C/20 0
Li-Ion taper current (mA) _______________ Sets the upper limit for charge termination NA C/10
Maximum overcharge (mAh) _______________ Sets the maximum amount of overcharge 256mAh 128mAh
Maximum temperature (°C)
_______________ Sets the maximum charge temperature
61°C61°C
∆T/∆t (°C/min)
_______________ Sets the termination rate 3°C/3min 4.6°C/20s
Fast-charge efficiency (%) _______________ Sets the fast-charge efficiency factor 95% 100%
Maintenance charge effi
-
ciency (%)
_______________ Sets the maintence charge efficiency factor 80% 100%
Self-discharge rate (%/day) _______________ Sets the batterys self-discharge rate 1.5%/day 0.2%/day
EDV1 (mV) _______________ Sets the initial end-of-discharge warning 1.05V/cell 3.0V/cell
EDVF (mV) _______________ Sets the final end-of-discharge warning 1.0V/cell 2.8V/cell
Hold-off timer for ∆T/∆t (sec.)
_______________
Sets the hold off period for ∆T/∆t
termination
180s 320s
Manufacturer name _______________ Programs manufacturer’s name (11 char.
max)
bq bq
Device name _______________ Programs device name (7 char. max) bq36 bq202
Chemistry _______________ Programs pack’s chemistry (7 char. max) NiMH LION
Manufacturer data _______________ Open field (5 char. max) 2040 2040
FAE Approval ____________________________________ Date: ____________
Table 1. bq2145 Module Configuration
Preliminary
bq2145
Loading...