Features
➤
bq2903 fast charge control evaluation and
development system for rechargeable alkaline
batteries such as Renewal® from Rayovac®
➤
Optional on-board 300mA current-limited charge
supply
➤
Fast charge of three or four alkaline cells
➤
Pulsed charge terminated by minimum current and
backed up by a maximum voltage safety termination
➤
Selectable end-of-discharge voltage
➤
Charge status indicator LEDs
➤
Datalog capability for charge and discharge currents
through the serial port of a PC
General Description
The EV2903 Evaluation System provides a development
and evaluation environment for the bq2903 Recharge-
able Alkaline Charge/Discharge Controller IC. The
EV2903 incorporates a bq2903, a bq2014 Gas Gauge IC,
an onboard discharge N-FET, and all other hardware
needed to charge three or four rechargeable alkaline
batteries, such as Renewal from Rayovac.
Fast charge is terminated when the average charge
rate falls below approximately 3% of the fast charge
rate. For safety, charging is inhibited if the voltage of
any cell is greater than 3.0V during charge or if the
voltage of any cell is less than 0.4V when not charging
(open-circuit voltage).
The user provides batteries and DC power supply. The
user configures the EV2903 for the number of cells
(three or four), end-of-discharge voltage, and on-board or
off-board current regulation.
Contents
1
EV2903 printed circuit board containing:
a) bq2903 PDIP IC
b) All programming jumpers
c)
Rayovac housing for three or four
Renewal™ batteries
d) Two status LEDs
e)
RS-232 serial port interface
1
Documentation kit including data sheets,
schematics, and user’s manual
1
EV2903 User Interface Program diskette
This program runs on any PC-compatible
computer running Windows 3.x and
equipped with a standard RS-232
(COM1, COM2, COM3, or COM4) serial port,
and provides the user with a complete menu-
driven system to control, monitor, and log
data from the EV2903 Evaluation Board.
The User Interface Program communicates
with the bq2903 over the DQ serial I/O port
using the RS-232 interface
1
RS-232 Cable
1
EV2903
bq2903 Evaluation System
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