3

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

Recommended Application Circuit Components

Component

Recommended Value

R1

0.47 µF ± 20%, X7R Ceramic

6.8 µF ± 20%, Tantalum

Notes:

5. CX1 must be placed within 0.7 cm of the HSDL-3602 to obtain optimum noise immunity.

Transceiver I/O Truth Table

Inputs

Outputs

Transceiver 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.