HSDL-3601 Datasheet, PDF (3/31 Pages) Agilent(Hewlett-Packard) – IrDA Compliant 4 Mb/s 5 V Infrared Transceiver

3
Functional Block Diagram
V_CC
R1
LEDA (10)
TXD (9)
SP
MD0 (4)
MD1 (5)
RXD (8)
HSDL-3601
I/O Pins Configuration Table
Pin
Description
1 Supply Voltage
2 Analog Ground
3 FIR Select
4 Mode 0
5 Mode 1
6 No Connection
7 Ground
8 Receiver Data Output
9 Transmitter Data Input
10 LED Anode
Symbol
Vcc
AGND
FIR_SEL
MD0
MD1
NC
GND
RXD
TXD
LEDA
FIR_SEL (3)
CX1
GND (7)
CX2
V_CC (1)
AGND (2)
10 9 8 7 6 5 4 3 2 1
BACK VIEW (HSDL-3601 #007/#017)
10 9 8 7 6 5 4 3 2 1
BOTTOM VIEW (HSDL-3601 #008/#018)
Transceiver Control Truth Table
Mode 0 Mode 1 FIR_SEL RX Function
1
0
0
0
X
Shutdown
0
SIR
0
1
0
SIR
1
1
0
SIR
0
0
1
MIR/FIR
0
1
1
MIR/FIR
1
1
1
MIR/FIR
X = Don’t Care
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
EI
1
X
0
High^[1]
0
High^[2]
0
Low
X^[4]
Low
X= Don’t Care EI = In-Band Infrared Intensity at detector
Outputs
LED
RXD
On
Not Valid
Off
Low^[3]
Off
Low^[3]
Off
High
Not Valid
Not Valid
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.