Transceiver Control Truth Table
Mode 0
Mode 1
FIR_SEL
1
0
X
0
0
0
0
1
0
1
1
0
0
0
1
0
1
1
1
1
1
X = Don't Care
RX Function
Shutdown
SIR
SIR
SIR
MIR/FIR
MIR/FIR
MIR/FIR
TX Function
Shutdown
Full Distance Power
2/3 Distance Power
1/3 Distance Power
Full Distance Power
2/3 Distance Power
1/3 Distance Power
Transceiver I/O Truth Table
Transceiver Mode
Active
Active
Active
Active
Shutdown
FIR_SEL
X
0
1
X
X
Inputs
TXD
1
0
0
0
X
[4]
EI
X
High
[1]
High
[2]
Low
Low
Outputs
LED
On
Off
Off
Off
Not Valid
RXD
Not Valid
Low
[3]
Low
[3]
High
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.
Recommended Application Circuit Components
Component
Recommended Value
R1
2.2 Ω ± 5%, 0.5 Watt, for 2.7 ≤ V
CC
≤ 3.3 V operation
2.7 Ω ± 5%, 0.5 Watt, for 3.0 ≤ V
CC
≤ 3.6 V operation
CX1
[5]
0.47 µF ± 20%, X7R Ceramic
CX2
[6]
6.8 µF ± 20%, Tantalum
Notes:
5. CX1 must be placed within 0.7 cm of the HSDL-3602 to obtain optimum noise immunity.
6. In "HSDL-3602 Functional Block Diagram" on page 1 it is assumed that Vled and V
CC
share the same supply voltage and filter capacitors. In case
the 2 pins are powered by different supplies CX2 is applicable for Vled and CX1 for V
CC
. In environments with noisy power supplies, including
CX2 on the V
CC
line can enhance supply rejection performance.
3
AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
