2

Functional Block Diagram

Ambient Light

Sensor

Sunlight

Cancellation

LED Driver with

Stuck High Protection

(4) Vcc

(5) NC

(6) PS_PFILT

(9) PS_ENB

(8) GND

(2) LEDON

(3) PS_DOUT

PIN

V-I Converter

TIA

Hysteresis

Comparator

(7) ALS_IOUT

Proximity Sensor ASIC

(10) LEDK

(1) NC

LED

I/O Pins Configuration Table

Pin

Symbol

Type

Description

1

NC

–

No Connection

2

LEDON

Digital I/P

LED Driver Input

LEDA will turn off when LEDON is stuck in high state for > Max-PW

3

PS_DOUT

Digital O/P

PS Digital Output

(Open drain output that requires a pull-up resistor of recommended value 10k

:)

PS_DOUT = LOW when PS_VPFILT > VTH

PS_DOUT = HIGH when PS_VPFILT < VTH

4

Vcc

Supply

Voltage Supply

5

NC

–

No Connection

6

PS_PFILT

Analog O/P

PS Analog Output

Connect to integration circuit (R3 and C3)

7

ALS_IOUT

Analog O/P

ALS analog current output

Connect to external load resistor R4. Recommended value 1k

:.

8

GND

Ground

Ground

9

PS_ENB

Digital I/P

PS Power Down Enable

ENB = 0 Normal mode operation, ENB = 1 Shut down mode

10

LEDK

Analog O/P

Connect to Cathode of LED (proximity sensor)

External current limiting resistor is used to control current flow in the LED