ISL29021

FN6732 Rev 0.00

Page 2 of 12

March 3, 2009

Pinout

ISL29021

(8 LD ODFN

TOP VIEW)

Block Diagram

1

2

3

8

7

6

VDDD

VDDA

GND

IRDR

INT

SDA

4

5

REXT

SCL

EXPOSED PAD CAN BE CONNECTED TO GND OR

ELECTRICALLY ISOLATED

Pin Descriptions

PIN NUMBER PIN NAME

DESCRIPTION

1

VDDD

Positive digital supply: 2.5V to 3.63V.

2

VDDA

Positive analog supply: 2.5V to 3.63V, VDDA and VDDD should be externally shorted.

3

GND

Ground.

4

REXT

External resistor pin setting the internal reference current and the conversion time. 499k

 with 1% tolerance resistor

is recommended.

5SCL

6SDA

7INT

Interrupt pin; LO for interrupt/alarming. The INT pin is an open drain.

8

IRDR

IR LED driver pin connecting to the anode of the external IR LED. The source current of the IR LED driver can be

Exposed pad connected to ground or electrically isolated.

VDDA

REXT

GND

SDA

SCL

IR PHOTODIODE

IR DATA

4

3

6

2

FOSC

IREF

5

IRDR

ISL29021

ARRAY

PROCESS

INTEGRATION

ADC

8

VDDD

1

INT

7

COMMAND

REGISTER

DATA

REGISTER

IR DRIVER

INTERRUPT