ICS1722
Pin Configuration
1
2
3
16
15
14
13
12
11
10
9
VDD
CHG
unused
DCHG
PFN
VIN
MMN
CMN
SEL0
4
5
6
7
8
OPREF
AUX1
AUX0
ICS1722
VSS
RC
SEL1
MRN
16-Pin DIP or SOIC
Pin Definitions
Pin Number
1
Pin Name
CHG
Type
OUT
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.
2
3
DCHG
PFN
OUT
OUT
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.
4
MMN
OUT
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.
5
CMN
OUT
IN
6
7
SEL0
VSS
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.
8
9
10
11
12
13
SEL1
MRN
RC
AUX0
AUX1
OPREF
IN
IN
IN
IN
IN
IN
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.
14
15
16
VIN
unused
VDD
IN
Ground.
Device supply =+5.0 VDC
Note:
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. ]
