2

ICS1700A

Pin Configuration

Pin Definitions

ICS1700A

CHG

DCHG

PFN

OTN

CMN

AVSS

RC

THERM

VREF

VIN

VDD

SEL0

VSS

MRN

SEL1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

unused

16-Pin DIP

20-Pin SOIC

Pin Number

DIP

SOIC

Pin Name

Type

Definition

1

1

CHG

OUT

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

the battery.

2

2

DCHG

OUT

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

3

3

PFN

OUT

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

for the presence of the battery or has determined the battery has been removed.

4

5

CMN

OUT

Charge mode indicator. A continuous low shows the controller is in a soft start or fast charge. The indicator

flashes during the topping and maintenance charges.

5

7

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.

6

8

SEL0

IN

Input used with the SEL1 pin to program the device for the desired charge rate.

7

9

VSS

Ground.

8

10

AVSS

Ground.

9

11

SEL1

IN

Input used with the SEL0 pin to program the device for the desired charge rate.

10

12

MRN

IN

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

11

13

RC

IN

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

12

14

THERM

IN

Thermistor or thermal switch input for temperature sensing.

13

16

VREF

1.26V voltage reference.

14

18

VIN

IN

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

15

19

unused

Ground.

16

20

VDD

Device supply =+5.0 VDC

Note:

(DIP/SOIC)

Pin 6/8 has an internal pull-up.

Pin 9/11 has an internal pull-up.

Pin 10/12 has an internal pull-up.

Pin 12/14 has an internal pull-up.

Pins 4, 6, 15, and 17 are unconnected in the SOIC package.