BQ2148LB [TI]
BQ2148LB;
| 型号： | BQ2148LB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | BQ2148LB 电池 |
| 文件： | 总8页 (文件大小：1206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary bq2148
Smart Battery Module with LEDs
and Pack Supervisor
Features
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Complete smart battery management solution for
Li-Ion battery packs
Accurate measurement of available battery
capacity
Provides overvoltage, undervoltage, and
overcurrent protection
Designed for battery pack integration:
–
–
Small size
Includes bq2040 and bq2058 ICs, and
configuration EEPROM
Unitrode configures the bq2168 based on the information
requested in Table 1. The configuration defines all the
EEPROM parameters and the protection threshold. Fig-
ure 1 shows how the module connects to the cells.
–
–
On-board charge and discharge control FETs
Low operating current for minimal battery
drain
The bq2148L includes four LEDs to display remaining capac-
ity in 25% increments of the learned capacity. The LEDs are
activated with the onboard push-button switch.
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Critical battery information available over two-wire
serial port
A module development kit is also available for the
bq2148. The bq2148B-KT or the bq2148LB-KT includes
one configured module and the following:
"L” version includes 4 push-button activated LEDs
to display state-of-charge information
1) An EV2200-40 interface board that allows connec-
tion to the serial port of any AT-compatible com-
puter.
General Description
The bq2148 Smaart Battery Module provides a complete
and compact battery management solution for Li-Ion bat-
tery 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.
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
PACK+/Pack positive
PACK-/Pack negative
Communications clock
Serial data
POS
NEG
SMBC
SMBD
ITEST
B1P
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.
Overcurrent test input
Battery 1 positive input
Battery 1 negative input
Battery 2 negative input
Battery 3 negative input
Battery 4 negative input
B1N
B2N
B3N
B4N
5/99
1
Preliminary bq2148
Table 1. bq2148 Module Configuration
Customer Name: ______________________________________________________________________________________________
Contact: _______________________________________________________ Phone:____________________________
Address:________________________________________________________________________________________________
Sales Contact: __________________________________________________
Phone: ____________________________
Board Configuration
LEDs and switch
Display mode
________________ Yes or No
________________ Relative or Absolute
Discharge current (3.9A max.) Min ____________
Duration at max. discharge ________________
Overvoltage threshold (4.25, 4.30, or 4.35V) ____________________________
Avg ____________ Max ___________
Number of series cells
_________________
EEPROM Configuration
Typical Values
Remaining time alarm (min) _______________ Sets the low time alarm level
10 min
Remaining capacity alarm
_______________ Sets the low capacity alarm level
(mAh)
C/10
Charging voltage (mV)
Design cpaacity (mAh)
Design voltage (mV)
Manufacturer date
Serial number
_______________ Sets the requested charging voltage
_______________ Defines the battery pack capacity
_______________ Defines the battery pack voltage
_______________ Battery pack manufacturer date
_______________ Battery pack serial number
4.1V/cell
3600
10800
mm/dd/yy
0-65535
1C
Fast-charging current (mA) _______________ Sets the requested charging current
Maintenance charging
current (mA)
Li-Ion taper current (mA)
Sets the requested maintenance charging
_______________ current
_______________ Sets the upper limit for charge termination
0
C/10
Maximum overcharge (mAh) _______________ Sets the maximum amount of overcharge
128mAh
61°C
4.6°C/20s
100%
_______________ Sets the maximum charge temperature
_______________ Sets the termination rate
Maximum temperature (°C)
∆T/∆t (°C/min)
Fast-charge efficiency (%)
_______________ Sets the fast-charge efficiency factor
Maintenance charge effi-
ciency (%)
_______________ Sets the maintence charge efficiency factor
100%
Self-discharge rate (%/day)
EDV1 (mV)
EDVF (mV)
_______________ Sets the batterys self-discharge rate
_______________ Sets the initial end-of-discharge warning
_______________ Sets the final end-of-discharge warning
0.2%/day
3.0V/cell
2.8V/cell
Sets the hold off period for ∆T/∆t
termination
_______________
320s
Hold-off timer for ∆T/∆t (sec.)
Manufacturer name
Device name
Chemistry
Manufacturer data
FAE approval:
_______________ Programs manufacturer’s name (11 char. max)
_______________ Programs device name (7 char. max)
_______________ Programs pack’s chemistry (5 char. max)
_______________ Open field (5 char. max)
bq
bq202
LION
2040
_______________
Date: ________________
2
bq2148 Preliminary
Battery Pack
Cells
B3N B2N B1N
B1P
POS
B4N
bq2148
NEG
PACK-
PACK+
Load
Charger
FG2148-1.eps
Figure 1. Module Connection Diagram
B1P
B1N
POS
B1P
B1N
POS
NC
Load
or
Charger
Load
or
Charger
B2N
B3N
B2N
B3N
B4N
NEG
B4N
NEG
Three-Cell Configuration
Four-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
Parameter
Value
Unit
Conditions
V
OP
Supply voltage (B1P to B4N)
18
V
DC
Maximum duration =
1.5µs
V
V
I
Maximum transient voltage (B1P to B4N)
Charging voltage (POS to NEG)
32
18
V
V
A
TR
CHG
V
> 6V
= 25°C
OP
Continuous charge/discharge current
3.9
CHG
T
A
T
Operating temperature
Storage temperature
0 to +70
°C
°C
OPR
T
-55 to +125
STG
Note:
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 con-
ditions 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
Conditions/Notes
Operating voltage, B1P to
B4N
V
OP
4.0
-
18
V
I
Operating current
-
-
-
-
350
50
µA
CCA
R
On resistance, B1P to POS
mΩ
T
A
= 25°C, V
= 10V
OP
ON
DC Thresholds (TA = TOPR)
Symbol
Parameter
Value
Tolerance
Unit
Notes
V
V
V
Overvoltage threshold
Charge enable voltage
Undervoltage limit
4.25
- 100mV
2.25
3.4
50mV
50mV
V
V
OV
V
CE
UV
OV
100mV
V
A
T
T
T
= 25°C
= 60°C
= 30°C
A
A
A
I
OC
Overcurrent limit
3.8
A
t
Undervoltage delay
Charge detect threshold
Overvoltage delay
950
70
ms
mV
ms
ms
50%
-60, +80
50%
UVD
V
t
CD
T
T
= 30°C
= 30°C
950
12
OVD
OCD
A
A
t
Overcurrent delay
60%
Note:
The thresholds above reflect the operation of a bq2148 using the standard bq2058 IC (V
= 4.25V).
OV
Specify other versions of the bq2058 by indicating the appropriate V
threshold in Table 1.
OV
Ordering Information
bq2148
B —
Customer Code:
1
Blank = Sample or Pre-production
KT = Evaluation system
2
XXX = Customer-specific; assigned by Unitrode
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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