ICS1700AEB Galaxy Power, Inc., ICS1700AEB Datasheet - Page 3

• Manufacturer Part Number: ICS1700AEB
• Description: Ics1700a Evaluation Board.
• Manufacturer: Galaxy Power, Inc.

Operation
Before applying power to the board, ensure that the board is
properly initialized.
After applying power to the board:
Push and hold the reset switch SW2 for at least 700ms. All LEDs
should turn off while the switch is depressed. The green CM LED
will light and will remain lit until full charge is detected by the
ICS1700A. At that moment, the CM LED will start flashing at a 1
Hz rate, indicating that the topping charge stage has begun. The
CM LED will flash until a reset is issued either by interrupting the
power, removing the batteries or depressing the reset switch SW2.
Battery Polling
Upon power-up or after a reset is issued, any excess charge from
filter capacitors at the +BAT and +CUR terminals is removed with
a series of discharge pulses. After the discharge pulse series is
complete, the voltage at VIN must be greater than 0.5V when a
battery is present. If the voltage at VIN is less than 0.5V, the
ICS1700A assumes no battery is attached and initiates a polling
sequence.
The ICS1700A then applies a 100ms charge pulse. During the
pulse, the ICS1700A monitors the VIN pin to determine if the
divided down terminal voltage is greater than the internal 2.0V
reference. If the battery is present, the voltage is clamped below the
2.0V reference when the current pulse is applied and the fast
charge stage begins immediately. If a battery is not present, the
voltage at VIN rises above the 2.0V reference and the BF LED
lights immediately.
Set SW1-1 and SW1-2 for the correct charge rate.
Check to make sure the divider resistors R6 and R8 are of the
correct value to normalize the battery pack voltage to one cell.
If applicable, choose resistors R1, R2 and R3 to obtain the
required discharge current.
Set the external charging current source for the amplitude
required by SW1 settings.
3
The charge pulses repeat for 10 seconds. If the battery is installed
within 10 seconds, the ICS1700A will turn off the BF LED and
enter the fast charge stage. If the battery is not installed within 10
seconds, the BF LED remains on and the
ICS1700A shuts down. A reset must be issued to restart the
controller after installing the battery.
Battery Fault Detection
The ICS1700A will turn on the BF LED and shut down if the
battery is removed or if an open circuit occurs in the current path
anytime after fast charge has been initiated. When in the topping
charge or maintenance charge stages, a charge pulse may not occur
for several seconds. During the period between charge pulses, the
voltage at VIN should be greater than 0.5V if a battery is attached.
If the voltage at VIN is less than 0.5V, the ICS1700A assumes the
battery has been removed, a fault condition is indicated by the BF
LED, and the controller shuts down.
Out-of-Temperature Range
The OT LED activates if the battery is either too hot or too cold to
fast charge. If a thermistor is used, the ICS1700A employs internal
voltage references to determine if a battery is hot or cold. Note:
Remove R9 and replace with a jumper when using a thermistor. A
10k
typically used. See the ICS1700A data sheet for additional
information.
If a thermal switch is used, choose a switch that opens at 45 C or
lower. If a thermal protection device is not used, the TS terminal
must be grounded.
ICS strongly recommends the use of a thermal safety device in the
battery pack. One source of thermal switches is Portage Electric
Products, Inc., in North Canton, Ohio; [phone]. A source of
thermistors is Semetic USA (Ishizuka Electronics Corp.), Babylon,
NY; [phone].
@ 25 C thermistor with an external pull-up resistor is
ICS1700A Evaluation Board