IRMT6452 Datasheet, PDF (2/7 Pages) Vishay Siliconix – SIDE VIEW IRMS6452/TOP VIEW

Table 1. Input/Output Functional Description
Symbol I/O Type
Polarity Function
RxD
Output
Active
Low
This output indicates received serial data. It is a push-pull CMOS driver capable of driv-
ing a standard CMOS or TTL load. No external pull-up or pull-down resistor is required.
This output may switch indeterminately when the module is transmitting. This output pin
is in tri-state mode when the module is in shutdown mode and during digital serial pro-
gramming operations. RxD is high at initializaton.
TxD
Input
Active
High
This CMOS input is used to transmit serial data when SD/ Mode is low. An on-chip pro-
tection circuit disables the LED driver if the TxDpin is asserted for longer than 60 µs.
When used in conjunction with the SD/ Mode pin. TxD is low at initializaton.
SD/ Mode Input
Active
High
Assertion of this pin high for a period of time exceeding 400 µs places the module into
shutdown mode. On the falling edge of this signal, the state of the TxDpin is sampled and
used to set receiver low bandwidth (TxD= Low) or high bandwidth (TxD= High) mode.
See Figures 7 and 8 for timings. SD is low at initializaton
V_CC
Positive Supply
-
GND
Ground (Power)
-
Connect to positive power supply (2.7 V to 5.25 V). Placement of a 1.0 µF to 10.0 µF de-
coupling ceramic capacitor as close as possible to the V_CC pin is recommended.
Connect to power supply ground. A solid ground plane is recommended.
NC
No Connect
-
This pin could be connected to ground.
L _EDA
L _EDC
Input
Output
-
This pin can be connected directly to V_CC. No series resistor is required.
-
LED cathode. Leave this pin unconnected. This pin may be monitored to determine the
state of the LED.
Figure 1. Block Diagram
V_CC
SD/Mode
TxD
Amp
Mode &
Power
Control
Comp
Driver
RxD
V_CC
LEDA
Driver
LEDC
GND
Figure 2. Minimum Vishay Low-Power Integrated Infrared
Transceiver Circuit Diagram
V_CC
C1= 1 µF to 10 µF
IR
Controller
IRTX
GPO
IRRX
V_CC LEDA
LEDC
NC
TxD
IRMS6452
SD/ Mode
RxD
GND
Table 2. Recommended Operating Conditions
Symbol
Parameter
Min
V _CC
Supply Voltage
2.7
T_A
Ambient Operating
-25
Temperature
Typical
Table 3. DC Electrical Characteristics
Symbol
Parameter
Min Typical
I_CC
Supply Current; Listening
2.0
3.2
I_CC
Supply Current; Receiving
3.8
I_SD
Supply Current; Shutdown
50
Table 4. Receiver DC Electrical Characteristics
Symbol
Parameter
Min
Typical
V _OL
RxD Output Low Voltage
I_OL
Static Sink Current on RxD
V _OH
RxD Output High Voltage
Vcc-0.5
I_OH
Static Source Current on RxD
RL
RxD Rosistive Load
2.2
C_L
RxD Capacitive Load
Document Number: 82579
Revision 05-July-02
Max
5.25
75
Max
4.5
15
100
Max
0.5
2.4
2.4
50
Unit
V
˚C
Unit
mA
mA
nA
Unit
V
mA
V
mA
kΩ
pF
Conditions
Conditions
Typical value obtained at Vcc=5 V
Interface and optical input power dependent
V_SD=V_CC
Conditions
2.2KΩ load.
2.2KΩ load.
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