TI BQ2145B-KT

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
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