3

I/O Pins Configuration Table

Pin

Description

Symbol

1

Supply Voltage

Vcc

2

Analog Ground

AGND

3

FIR Select

FIR_SEL

4

Mode 0

MD0

5

Mode 1

MD1

6

No Connection

NC

7

Ground

GND

8

Receiver Data Output

RXD

9

Transmitter Data Input

TXD

10

LED Anode

LEDA

Transceiver Control Truth Table

Mode 0

Mode 1

FIR_SEL

RX Function

TX Function

1

0

X

Shutdown

Shutdown

0

0

0

SIR

Full Distance Power

0

1

0

SIR

2/3 Distance Power

1

1

0

SIR

1/3 Distance Power

0

0

1

MIR/FIR

Full Distance Power

0

1

1

MIR/FIR

2/3 Distance Power

1

1

1

MIR/FIR

1/3 Distance Power

X = Don’t Care

Transceiver I/O Truth Table

Transceiver

Inputs

Outputs

Mode

FIR_SEL

TXD

EI

LED

RXD

Active

X

1

X

On

Not Valid

Active

0

0

Off

Active

1

0

Off

Active

X

0

Low

Off

High

Shutdown

X

Low

Not Valid

Not Valid

X= Don’t Care

EI = In-Band Infrared Intensity at detector

Notes :

1. In-Band EI

≤ 115.2 kb/s and FIR_SEL = 0.

2. In-Band EI

≥ 0.576 Mb/s and FIR_SEL = 1.

3. Logic Low is a pulsed response. The condition is maintained for duration dependent on the pattern and strength of the incident

intensity.

4. To maintain low shutdown current, TXD needs to be driven high or low and not left floating.

Functional Block Diagram

TXD (9)

MD0 (4)

MD1 (5)

RXD (8)

FIR_SEL (3)

GND (7)

AGND (2)

VCC (1)

R1

VCC

SP

HSDL-3601

CX1

CX2

LEDA (10)

87

6

5

432

1

9

10

87

6

5

432

1

9

10

BACK VIEW (HSDL-3601 #007/#017)

BOTTOM VIEW (HSDL-3601 #008/#018)