TI BQ2150HLB-

Preliminary
bq2150H
Li-Ion Power Gauge™ Module
Features
ä
Complete bq2050H Power Gauge solution for Li-Ion
battery packs
ä
Battery information available over a single-wire
(HDQ) bidirectional serial port
ä
Control signals to enhance pack protection
ä
Battery state-of-charge monitoring for 2- to 5-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
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.
General Description
A module development kit is also available for the
bq2150. The bq2150HB-KT or the bq2150HLB-KT includes one configured module and the following:
The bq2150H 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 bq2150H Gas Gauge IC, a current
sense resistor, and all other components necessary to accurately monitor and display the capacity of 2 to 5 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 EV2200-50H 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 bq2150H
from any standard Windows 3.1x or 95 PC.
Pin Descriptions
Contacts are provided on the bq2150H for direct connection to the battery stack (BAT+, BAT-) and the serial
communications port (HDQ). The RBI input provides
backup power to the bq2150H in the event that the cells
are removed or the battery is turned off. The bq2150H
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
bq2050H 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 bq2150H is
non-functional, and the RBI power source maintains
register information. Please refer to the bq2050H data
sheet for the specifics on the operation of the Gas Gauge.
Unitrode configures the bq2150H based on the information requested in Table 1. The configuration defines the
10/97
1
P1
HDQ/Serial Communications port
P2
PSTAT/Protector status input
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
P9
CFC/Charge FET control output
bq2150H Preliminary
Battery Pack
Cells
P8
bq2150H
P3
P7
PACK-
PACK+
Load
Charger
FG2150H1.eps
Figure 1. Module Connection Diagram
Table 1. bq2150H Module Configuration
Customer Name: ___________________________________________________________________________
Contact: _________________________________________
Phone: ______________________________
Address: _________________________________________________________________________________
_________________________________________________________________________________
Sales Contact: ____________________________________
Phone: ______________________________
Number of series battery cells (2-5)
____________________
Coke or graphite cell anode
____________________
Battery pack capacity (mAh)
____________________
Discharge rate into load (A)
min. ________ avg. _________ max. _________
Charge rate
____________________
Self-discharge compensation (Y/N)
____________________
LEDs and switch (Y/N)
____________________
FAE Approval: __________________________________
2
Date: _______________________________
Preliminary bq2150H
bq2150H Schematic
VCC
VCC
R11
BAT+
1
100
R23
D1
R16
330
100K
R19
100K
R17
100K
R14
R12
100K
2
100K
GREEN
C1
GREEN
D4
GREEN
D5
R22
Q1
2N7002
P9
CFC
GREEN
4
BAV99
R25
PSTAT
1
2
1
16
15
14
13
12
11
10
9
D7
100
4
4
R26
R1
1
R20
R18
R15
R13
100K
100K
100K
100K
100K
1
R7
C4
0.1UF
2
1
2
2
4
MOMENTARY
R4
BAT-
2
1
20K
C3
0.1UF
1 See Table 1 for resistor values.
R8
3
R9
3
R10
3
PACK1
GND
1
For 1 cell configuration install R11 and R9,
for greater than 1 cell configuration install Q1, D6, and R2.
3 Sense resistor value depends on application.
4
For PSTAT function, install R25 and D10.
If not using PSTAT, install 0 jumper at R26.
2150H/9-16-97/A
3
P5
1UF
3
NOT_USED
2 RBI
1
S1
R5
R27
P1
C5
1
VCC
1
10K
BAV99
1%
TABLE 1
R7
# OF CELLS
R2
R6
2
200K 698K 100K
3
300K 1.1M 100K
4
499K 1.5M 100K
5
1M 1.3M 69.8K
HDQ
1
D8
0.1UF
2
100
1%
3
R24
P2
BAV99
1
R6
C2
1
P4
BAV99
R2
LCOM VCC
REF
SEG1
SEG2 PSTAT
HDQ
SEG3
RBI
SEG4
SB
SEG5
CFC
DISP
SR
VSS
P3
D10
2
D6
BQ2050H
330
1
U1
1
2
3
4
5
6
7
8
GREEN
SD
2
100K
2
0.1UF
D3
330
R3
BZX84C5V1
VCC
D2
R21
D9
2
1
2
P8
P7
P6
bq2150H Preliminary
bq2150H Board
Ordering Information
bq2150H
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
Device:
Li-Ion Power Gauge Module
Notes:
1. Requires configuration sheet (Table 1)
2. Example production part number: bq2150HLB-001
4
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