ICS1722
Pin Configuration
CHG
DCHG
PFN
MMN
CMN
SEL0
VSS
SEL1
1
2
3
4
5
6
7
8
16-Pin DIP or SOIC
16
15
14
VDD
unused
VIN
OPREF
AUX1
AUX0
RC
MRN
ICS1722
13
12
11
10
9
Pin Definitions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Note:
Pin Name
CHG
DCHG
PFN
MMN
CMN
SEL0
VSS
SEL1
MRN
RC
AUX0
AUX1
OPREF
VIN
unused
VDD
Type
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
IN
Definition
Active high TTL compatible signal used to turn on an external current source to provide current to charge
the battery.
Active high TTL compatible signal available to turn on a discharge circuit.
Polling detect indicator. An active low turns on an external indicator to show the controller is polling for
the presence of the battery.
Maintenance mode indicator. An active low turns on an external indicator showing the battery is either in
the topping charge, maintenance charge or auxiliary condition mode. The indicator flashes during the
auxiliary discharge mode.
Charge mode indicator. An active low turns on an external indicator to show the controller is either in a
soft start charge or fast charge.
Tri-level input used with the SEL1 pin to program the device for the desired charge rate.
Ground.
Tri-level input used with the SEL0 pin to program the device for the desired charge rate.
Master reset signal. A logic low pulse greater than 700 ms initiates a device reset.
An external resistor and capacitor sets the frequency of the internal clock.
Tri-level input used with the AUX1 pin to program the device for an auxiliary operating mode.
Tri-level input used with the AUX0 pin to program the device for an auxiliary operating mode.
Open circuit (no battery) voltage reference. An external resistor divider on this pin sets the open circuit
voltage reference used to detect the presence of a battery.
Battery voltage normalized to one cell with an external resistor divider.
Ground.
Device supply =+5.0 VDC
Pins 9 and 13 have an internal pull-up.
Pins 6,8,11,12 float to 2.3V when unconnected.
2
GALAXY [ GALAXY POWER, INC. ]
