TI BQ2148LB- Smart battery module with leds and pack supervisor Datasheet

Preliminary
bq2148
Smart Battery Module with LEDs
and Pack Supervisor
Features
ä
Complete smart battery management solution for
Li-Ion battery packs
ä
Accurate measurement of available battery
capacity
ä
Provides overvoltage, undervoltage, and
overcurrent protection
ä
Designed for battery pack integration:
–
Small size
–
I ncl ud e s b q 2 0 4 0 a nd b q 2 0 5 8 I C s, a n d
configuration EEPROM
–
On-board charge and discharge control FETs
–
Low operating current for minimal battery
drain
ä
Critical battery information available over two-wire
serial port
ä
"L” version includes 4 push-button activated LEDs
to display state-of-charge information
Unitrode configures the bq2168 based on the information
requested in Table 1. The configuration defines all the
EEPROM parameters and the protection threshold. Figure 1 shows how the module connects to the cells.
The bq2148L includes four LEDs to display remaining capacity in 25% increments of the learned capacity. The LEDs are
activated with the onboard push-button switch.
A module development kit is also available for the
bq2148. The bq2148B-KT or the bq2148LB-KT includes
one configured module and the following:
General Description
The bq2148 Smaart Battery Module provides a complete
and compact battery management solution for Li-Ion battery packs. Designed for battery pack integration, the
bq2168 combines the bq2040H Gas Gauge IC with the
bq2058 Supervisor IC on a small printed circuit board. The
board includes all the necessary components to accurately
monitor battery capacity and protect the cells from
overvoltage, undervoltage, and overcurrent conditions. The
board works with three or four Li-Ion series cells.
1)
An EV2200-40 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 bq2040
from any standard Windows 3.1x or 95 PC.
Pin Descriptions
The Gas Gauge IC uses the on-board sense resistor to
track charge and discharge activity of the battery pack.
Critical battery information can be accessed through the
serial communications port at SMBC/SMBD. The
bq2148 uses the SMBus communications protocol and
supports the Smart Battery Data Commands in the SBD
specification. The supervisor circuit consists of the
bq2058 and two FETs. The bq2058 controls the FETs to
protect the batteries during charge/discharge cycles and
short circuit conditions. The bq2168 provides contacts
for the positive and negative terminals of each battery in
the stack. Please refer to the bq2040 and bq2058 data
sheets for the specifics on the operation of the power
gauge and supervisor ICs.
5/99
1
POS
PACK+/Pack positive
NEG
PACK-/Pack negative
SMBC
Communications clock
SMBD
Serial data
ITEST
Overcurrent test input
B1P
Battery 1 positive input
B1N
Battery 1 negative input
B2N
Battery 2 negative input
B3N
Battery 3 negative input
B4N
Battery 4 negative input
Preliminary bq2148
Table 1. bq2148 Module Configuration
Customer Name: ______________________________________________________________________________________________
Contact: _______________________________________________________
Phone:____________________________
Address:________________________________________________________________________________________________
Sales Contact: __________________________________________________
Phone: ____________________________
Board Configuration
LEDs and switch
________________ Yes or No
Display mode
________________ Relative or Absolute
Discharge current (3.9A max.) Min ____________
Avg ____________
Duration at max. discharge
________________
Overvoltage threshold (4.25, 4.30, or 4.35V) ____________________________
Number of series cells
_________________
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)
Max ___________
_______________
Sets the low time alarm level
_______________
Sets the low capacity alarm level
_______________
_______________
_______________
_______________
_______________
_______________
_______________
_______________
_______________
_______________
Sets the requested charging voltage
Defines the battery pack capacity
Defines the battery pack voltage
Battery pack manufacturer date
Battery pack serial number
Sets the requested charging current
Sets the requested maintenance charging
current
Sets the upper limit for charge termination
Sets the maximum amount of overcharge
Sets the maximum charge temperature
∆T/∆t (°C/min)
Fast-charge efficiency (%)
Maintenance charge efficiency (%)
Self-discharge rate (%/day)
EDV1 (mV)
EDVF (mV)
_______________
_______________
Sets the termination rate
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
Hold-off timer for ∆T/∆t (sec.)
_______________
Manufacturer name
Device name
Chemistry
Manufacturer data
FAE approval:
_______________
_______________
_______________
_______________
_______________
Maximum temperature (°C)
Typical Values
10 min
C/10
4.1V/cell
3600
10800
mm/dd/yy
0-65535
1C
0
C/10
128mAh
61°C
4.6°C/20s
100%
100%
0.2%/day
3.0V/cell
2.8V/cell
Sets the hold off period for ∆T/∆t
320s
termination
Programs manufacturer’s name (11 char. max)
bq
Programs device name (7 char. max)
bq202
Programs pack’s chemistry (5 char. max)
LION
Open field (5 char. max)
2040
Date: ________________
2
bq2148 Preliminary
Battery Pack
Cells
B4N
B3N B2N B1N B1P
bq2148
NEG
POS
PACK-
PACK+
Load
Charger
FG2148-1.eps
Figure 1. Module Connection Diagram
B1P
NC
B1P
POS
B1N
B1N
Load
or
Charger
B2N
Load
or
Charger
B2N
B3N
B3N
B4N
POS
B4N
NEG
NEG
Four-Cell Configuration
Three-Cell Configuration
Note: B1P, B4N, POS, and NEG accomodate a #20 AWG stranded wire.
B1N, B2N, and B3N accomodate a #24 AWG stranded wire.
FG2158cc.eps
Figure 1. Module Connection Diagram
Absolute Maximum Ratings
Symbol
VOP
Parameter
Supply voltage (B1P to B4N)
Value
Unit
18
V
DC
Maximum duration =
1.5µs
VTR
Maximum transient voltage (B1P to B4N)
32
V
VCHG
Charging voltage (POS to NEG)
18
V
ICHG
Continuous charge/discharge current
3.9
A
TOPR
Operating temperature
0 to +70
°C
TSTG
Storage temperature
-55 to +125
°C
Note:
Conditions
VOP > 6V
TA = 25°C
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.
3
Preliminary bq2148
bq2148 Schematic
1
2
3
Component values depend on user-provided information in Table 1.
33153f_1.eps
4
bq2148 Preliminary
bq2148 Schematic (Continued)
33153f_2.eps
5
Preliminary bq2148
bq2148 Board
DS2148_F.eps
6
bq2148 Preliminary
DC Electrical Characteristics (TA = TOPR)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
4.0
-
18
V
VOP
Operating voltage, B1P to
B4N
ICCA
Operating current
-
-
350
µA
RON
On resistance, B1P to POS
-
-
50
mΩ
Conditions/Notes
TA = 25°C, VOP = 10V
DC Thresholds (TA = TOPR)
Symbol
Parameter
Value
Tolerance
Unit
VOV
Overvoltage threshold
4.25
± 50mV
V
VCE
Charge enable voltage
VOV - 100mV
± 50mV
V
VUV
Undervoltage limit
2.25
± 100mV
V
3.4
IOC
Overcurrent limit
tUVD
Undervoltage delay
A
3.8
Notes
TA = 25°C
A
TA = 60°C
950
±50%
ms
TA = 30°C
VCD
Charge detect threshold
70
-60, +80
mV
tOVD
Overvoltage delay
950
±50%
ms
TA = 30°C
tOCD
Overcurrent delay
12
±60%
ms
TA = 30°C
Note:
The thresholds above reflect the operation of a bq2148 using the standard bq2058 IC (VOV = 4.25V).
Specify other versions of the bq2058 by indicating the appropriate VOV threshold in Table 1.
Ordering Information
bq2148
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:
Smart Battery Module with LEDs and Pack Supervisor
Notes:
1. Requires configuration sheet (Table 1)
2. Example production part number: bq2148LB-001
7
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