TI BQ219XL

Preliminary
bq219XL
Smart Battery Module with LEDs
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 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
–
Four onboard state-of-charge LEDs with
push-button activation
–
Low operating current for minimal battery
drain
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.
A module development kit is also available for the
bq219XL. The bq219XLB-KT includes one configured
module and the following:
Critical battery information available over two-wire
serial port
General Description
The bq219XL Smart Battery Module provides a complete 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 specifications. 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 accurately 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 remaining battery capacity in 25% increments.
1)
An EV2200-92 or EV2200-40 interface board that
allows connection to the serial port of any ATcompatible 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.
Pin Descriptions
Contacts are provided on the bq219XL for direct connection to the battery stack (B+, B-) and the two-wire interface (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 information requested in Table 1. The configuration defines the
pack voltage, capacity, and chemistry and charge control
6/98
1
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
bq219XL Preliminary
Battery Pack
Cells
Bbq219XL
B+
PPACK-
PACK+
Load
Charger
FG219XL1.eps
Figure 1. Module Connection Diagram
2
Preliminary bq219XL
Table 1. bq219XL Module Configuration
Customer Name: ______________________________________________________________________________________________
Contact: _______________________________________________________
Phone:____________________________
Address:________________________________________________________________________________________________
Sales Contact: __________________________________________________
Phone: ____________________________
Board Configuration
IC type
LEDs and switch
Display mode
Discharge rate (3.0A max.)
Duration at max. discharge
Number of series cells
________________
________________
________________
Min ____________
________________
________________
bq2040 or bq2092
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:
Typical Values
NiMH
Li-Ion
10 min
10 min
_______________
Sets the low time alarm level
_______________
Sets the low capacity alarm level
_______________
_______________
_______________
_______________
_______________
_______________
_______________
_______________
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
95%
100%
_______________
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
_______________
_______________
_______________
_______________
C/10
80%
5-3
100%
1.5%/day 0.2%/day
1.05V/cell 3.0V/cell
1.0V/cell 2.8V/cell
Sets the hold off period for ∆T/∆t
180s
termination
_______________ Programs manufacturer’s name (11 char. max)
bq
_______________ Programs device name (7 char. max)
bq36
_______________ Programs pack’s chemistry (5 char. max)
NiMH
_______________ Open field (5 char. max)
2040
________________
Date: ___________________
_______________
C/10
320s
bq
bq202
LION
2040
bq219XL Preliminary
bq219XL Schematic
219xlb
4
Preliminary bq219XL
bq219XL Board
5
bq219XL Preliminary
Ordering Information
bq219XL B – XXX
Customer Code:
Blank = Sample or Pre-production1
KT = Evaluation system
XXX = Customer-specific; assigned by Unitrode2
Package Option:
B = Board-level product
Device:
Smart Battery Module with LEDs
Notes:
1. Requires configuration sheet (see Table 1)
2. Example production part number: bq219XLB-001
6
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