2

ICS1702

Pin Configuration

Pin Definitions

20-Pin DIP or SOIC

ICS1702

CHG

DCHG

PFN

CMN

MMN

VSS

AUX1

RC

THERM

OPREF

VIN

VDD

AVSS

OTN

SEL1

MRN

SEL0

AUX0

DTSEL

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

unused

Pin Number

Pin Name

Type

Definition

1

CHG

OUT

Active high TTL compatible signal used to turn on an external current source to provide current to charge

the battery.

2

DCHG

OUT

Active high TTL compatible signal available to turn on a discharge circuit.

3

PFN

OUT

Polling detect indicator. An active low turns on an external indicator to show the controller is polling for

the presence of the battery.

4

MMN

OUT

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. This signal is also applied with the

out-of-temperature range indicator when the controller is in a cold battery charge mode. The indicator

flashes during the auxiliary discharge mode.

5

CMN

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.

6

OTN

OUT

Out-of-temperature range indicator. An active low turns on an external indicator showing the battery is

out of the normal fast charge temperature range.

7

SEL0

IN

Tri-level input used with the SEL1 pin to program the device for the desired charge rate.

8

VSS

Ground.

9

AVSS

Ground.

10

SEL1

IN

Tri-level input used with the SEL0 pin to program the device for the desired charge rate.

11

MRN

IN

Master reset signal. A logic low pulse greater than 700 ms initiates a device reset.

12

RC

IN

An external resistor and capacitor sets the frequency of the internal clock.

13

DTSEL

IN

Selects temperature slope and/or voltage slope termination.

14

AUX0

IN

Tri-level input used with the AUX1 pin to program the device for an auxiliary operating mode.

15

AUX1

IN

Tri-level input used with the AUX0 pin to program the device for an auxiliary operating mode.

16

THERM

IN

Thermistor or thermal switch input for temperature sensing.

17

OPREF

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.

18

VIN

IN

Battery voltage normalized to one cell with an external resistor divider.

19

unused

Ground.

20

VDD

Device supply =+5.0 VDC

Note:

Pin 11 has an internal pull-up.

Pin 16 has an internal pull-up.

Pin 13 has an internal pull-down.

Pins 7, 10, 14, 15 float to 2.3V when unconnected.