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Measures only 3.5 (L) x 0.3 (W) inches
Incl ud e s G as Ga u g e I C, c o nf i g u r a t io n
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 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.
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.
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
6/98
2)
Pin Descriptions
B+
P-
C
D
B-
STAT
BAT+/Battery positive/Pack positive
PACK-/Pack negative
SMBC/Communications clock
SMBD/Serial data
BAT-/Battery negative
STAT/No connect
1
1
2
3
4
5
6
7
