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SE9021 Datasheet(PDF) 6 Page - Seaward Electronics Inc.

Part # SE9021
Description  Standalone Linear Lithium Battery Charger
PDF  8 Pages
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Manufacturer  SEAWARD [Seaward Electronics Inc.]
Direct Link  http://www.seawardinc.com
Logo SEAWARD - Seaward Electronics Inc.

SE9021 Datasheet(HTML) 6 Page - Seaward Electronics Inc.

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Revision 11/2/2010
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 6
Typical Operating Characteristics
SE9021 Charging Curve
0
50
100
150
200
250
300
3.5
3.6
3.7
3.8
3.9
4
4.1
4.2
4.3
4.4
Battery Voltage (V)
Series2
Application Notes:
LED1
RED
LED2
Green
LED3
Blue
R2
1K
R3
1K
R1
1K
Bat-
Bat+
Vcc
GND
C1
220uF
4.75V ~ 6V
LED4
Yellow
R4
1K
Table#1. Waterfall LED Application.
The typical SE9021 display Logic is shown below:
System States
Power Supply
Condition
Battery
Condition
LED1
LED2
LED3
LED4
Battery Detection
Disconnected
Connected
ON
OFF
OFF
OFF
Power Detection
Connected
Disconnected
OFF
OFF
OFF
OFF
Charging
Flashing
Flashing
Flashing
Flashing
Near Completion
Fast
Flashing
Fast
Flashing
Fast
Flashing
Fast
Flashing
Battery Full
Connected
Connected
ON
ON
ON
ON
Battery Shorted
Shorted
OFF
OFF
OFF
OFF



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