TI BQ2150 Li-ion power gaugeâ ¢ module Datasheet

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
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Copyright  1999, Texas Instruments Incorporated
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