Pin Functions
Pin
Pin Function Description
P Positive Input Supply Voltage. Provides
Pin
Pin Function Description
Vin
power to the charger. Vin can range
from 4.75V to 6V and should be
bypassed with at least a 1μF capacitor.
Charge Current Output. Provides charge current to the battery and
BAT-
regulates the final float voltage to 4.2V. SE9020C/D will automatically
identify the polarity so this pin can be connected to BAT+ also.
LED1 is lit on when the Vin is connected to any voltage between 4.75V
GND
Ground.
LED1
and 6V.
Charge Current Output. Provides
charge current to the battery and
regulates the final float voltage to 4.2V.
SE9020C/D will automatically identify
the polarity so this pin can be
connected to BAT- also.
With SOT-23-6L package. LED2 supports 2 options to indicate the
Charging and Full of the battery. With SE9020D, the LED2 will flash at
5Hz frequency during charging. When the battery is full, LED2 will
BAT+
LED2
output a constant voltage and the flashing will stop. With SE9020C,
LED2 can drive a standard 7-color IC-LED.
With DIP-8 package LED2 can only drive a standard 7-color IC-LED.
With DIP-8 package the LED3 will flash
at 5Hz frequency during charging.
LED3
When the battery is full, LED3 will
output a constant voltage and the
flashing will stop
NC
With DIP-8 package NC is the unused PIN
Typical Operating Characteristics
Revision 2/16/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 4
SEAWARD [ Seaward Electronics Inc. ]
