Features
Complete smart battery solution for NiCd, NiMH,
and Li-Ion battery packs
Based on the bq2092 or bq2040 Gas Gauge IC
Ideal for DR35 or DR36 type packs
Narrow board fits in the crevice formed by two
adjacent battery packs
Accurate measurement of available battery
capacity
Designed for battery pack integration:
Measures only 3.5 (L) x 0.3 (W) inches
I n cl u d e s G a s G a u g e I C, c o n f i g u r a t i o n
EEPROM, and sense resistor
Four onboard state-of-charge LEDs with
push-button activation
Low operating current for minimal battery
drain
Critical battery information available over two-wire
serial port
General Description
The bq219XL Smart Battery Module provides a com-
plete solution for the design of intelligent battery packs.
The bq219XL uses the SMBus protocol and supports the
Smart Battery Data commands in the SMB/SBD specifi-
cations.
Designed for battery pack integration, the
bq219XL combines the bq2092 or bq2040 Gas Gauge IC
with a serial EEPROM on a small printed circuit board.
The board includes all the necessary components to ac-
curately monitor battery capacity and communicate
critical battery parameters to the host system or battery
charger.
The bq219XL also includes four LEDs.
The
push-button switch activates the LEDs to show remain-
ing battery capacity in 25% increments.
Contacts are provided on the bq219XL for direct connec-
tion to the battery stack (B+, B-) and the two-wire inter-
face (C, D). Please refer to the bq2092 or bq2040 data
sheet for specific information on the operation of the Gas
Gauge and communication interface.
Unitrode configures the bq219XL based on the informa-
tion 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 ac-
tivity of the battery pack. Figure 1 shows how the mod-
ule connects to the cells.
A module development kit is also available for the
bq219XL.
The bq219XLB-KT includes one configured
module and the following:
1)
An EV2200-92 or 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 Gas
Gauge IC and serial E
2
PROM from any standard
Windows 95 or 3.1x PC.
Pin Descriptions
B+
BAT+/Battery positive/Pack positive
P-
PACK-/Pack negative
C
SMBC/Communications clock
D
SMBD/Serial data
B-
BAT-/Battery negative
STAT
STAT/No connect
1
Smart Battery Module with LEDs
bq219XL
6/98
5-3
Preliminary
bq219XL
Customer Name: ______________________________________________________________________________________________
Contact: _______________________________________________________
Phone:____________________________
Address:________________________________________________________________________________________________
Sales Contact: __________________________________________________
Phone: ____________________________
Board Configuration
IC type
________________
bq2040 or bq2092
LEDs and switch
________________
Yes or No
Display mode
________________
Relative or Absolute
Discharge rate (3.0A max.)
Min ____________
Avg ____________
Max ___________
Duration at max. discharge
________________
Number of series cells
________________
EEPROM Configuration
Typical Values
NiMH
Li-Ion
Remaining time alarm (min) _______________
Sets the low time alarm level
10 min
10 min
Remaining capacity alarm
(mAh)
_______________
Sets the low capacity alarm level
C/10
C/10
Charging voltage (mV)
_______________
Sets the requested charging voltage
65535
4.1V/cell
Design cpaacity (mAh)
_______________
Defines the battery pack capacity
3000
3600
Design voltage (mV)
_______________
Defines the battery pack voltage
12000
10800
Manufacturer date
_______________
Battery pack manufacturer date
mm/dd/yy mm/dd/yy
Serial number
_______________
Battery pack serial number
0-65535
0-65535
Fast-charging current (mA)
_______________
Sets the requested charging current
1C
1C
Maintenance charging
current (mA)
_______________
Sets the requested maintenance charging
current
C/20
0
Li-Ion taper current (mA)
_______________
Sets the upper limit for charge termination
NA
C/10
Maximum overcharge (mAh) _______________
Sets the maximum amount of overcharge
256mAh
128mAh
Maximum temperature (
C) _______________ Sets the maximum charge temperature
61
C
61
C
T/t (C/min)
_______________
Sets the termination rate
3C/3min
4.6C/20s
Fast-charge efficiency (%)
_______________
Sets the fast-charge efficiency factor
95%
100%
Maintenance charge effi-
ciency (%)
_______________
Sets the maintence charge efficiency factor
80%
100%
Self-discharge rate (%/day)
_______________
Sets the batterys self-discharge rate
1.5%/day
0.2%/day
EDV1 (mV)
_______________
Sets the initial end-of-discharge warning
1.05V/cell
3.0V/cell
EDVF (mV)
_______________
Sets the final end-of-discharge warning
1.0V/cell
2.8V/cell
Hold-off timer for
T/t (sec.) _______________
Sets the hold off period for
T/t
termination
180s
320s
Manufacturer name
_______________
Programs manufacturer's name (11 char. max)
bq
bq
Device name
_______________
Programs device name (7 char. max)
bq36
bq202
Chemistry
_______________
Programs pack's chemistry (5 char. max)
NiMH
LION
Manufacturer data
_______________
Open field (5 char. max)
2040
2040
FAE Approval: ________________
Date: ___________________
Table 1. bq219XL Module Configuration
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