Transceiver Control Truth Table
Mode 0
1
0
0
1
0
0
1
Mode 1
FIR_SEL
RX Function
Shutdown
SIR
SIR
SIR
MIR/FIR
MIR/FIR
MIR/FIR
TX Function
Shutdown
0
0
1
1
0
1
1
X
0
0
0
1
1
1
Full Distance Power
2/3 Distance Power
1/3 Distance Power
Full Distance Power
2/3 Distance Power
1/3 Distance Power
X = Don't Care
Transceiver I/O Truth Table
Inputs
TXD
Outputs
LED
Transceiver Mode
Active
Active
Active
Active
FIR_SEL
EI
RXD
Not Valid
X
0
1
X
X
1
0
0
0
X
High
High
Low
Low
On
Off
Off
Off
[1]
[3]
Low
Low
[2]
[3]
High
Not Valid
[4]
Shutdown
X
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
R1
Recommended Value
2.2 Ω 5ꢀ, 0.5 Watt, for 2.7 ≤ V ≤ 3.3 V operation
CC
2.7 Ω 5ꢀ, 0.5 Watt, for 3.0 ≤ V ≤ 3.6 V operation
0.47 µF 20ꢀ, X7R Ceramic
6.8 µF 20ꢀ, Tantalum
CC
[5]
CX1
CX2
[6]
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 share the same supply voltage and filter capacitors. In case
CC
the 2 pins are powered by different supplies CX2 is applicable for Vled and CX1 for V . In environments with noisy power supplies, including
CC
CX2 on the V line can enhance supply rejection performance.
CC
3
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