3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
Pin Description (continued)
PIN
MAX3130
MAX3131
NAME
FUNCTION
TTL/CMOS RS-232 Transmitter Input. For the MAX3130, drive
IRMODE
low to connect
T2IN to the IR transmitter input, and drive
IRMODE
high to connect T2IN to the RS-232
transmitter input. For the MAX3131, T2IN is always connected to the RS-232 transmitter
input.
IR Mode Control. Drive
IRMODE
low to connect R2OUT to the IR receiver output and
T2IN to the IR transmitter input. Driving
IRMODE
low also shuts down the RS-232
charge pump and puts the RS-232 transmitter outputs in a high-impedance state. Drive
IRMODE
high to connect R2OUT to the RS-232 receiver output and connect T2IN to the
RS-232 transmitter input.
IR Transmitter TTL/CMOS Data Input
TTL/CMOS RS-232 Receiver Output
RS-232 Receiver Input
RS-232 Transmitter Output
16-Times Baud-Rate Input. To use the ENDEC, apply a signal that is 16 times the baud
rate into BAUD16. Connect BAUD16 to GND or V
CC
to disable the ENDEC.
Ground
3.0V to 5.5V Supply Voltage
No Connection.
Do not make connections to these pins.
Analog Supply Voltage V
CC
for IR Signal Processing. AV
CC
range is 3.0V to 5.5V.
Analog Ground for IR Signal Processing. Connect to GND.
Silicon PIN Photodiode Input. Connect PINC to the cathode of the PIN photodiode.
Connect the anode of the PIN photodiode to GND.
Shutdown Input for the IrDA Transceiver Circuitry
Power Ground for IR LED Driver. Connect to GND.
Open-Drain Output for Driving the IR LED. Connect LEDC to the cathode of the IR LED.
+5.5V Generated by the Internal Charge Pump
Positive Terminal of the Voltage-Doubling Charge-Pump Capacitor
Negative Terminal of the Voltage-Doubling Charge-Pump Capacitor
Positive Terminal of the Inverting Charge-Pump Capacitor
Negative Terminal of the Inverting Charge-Pump Capacitor
-5.5V Generated by the Internal Charge Pump
Shutdown Input for the RS-232 Transmitters and Charge Pump
RS-232 Transmitter Output
RS-232 Receiver Input
TTL/CMOS RS-232 Receiver Output. For the MAX3130, drive
IRMODE
low to connect
R2OUT to the IR receiver output, and drive
IRMODE
high to connect R2OUT to the
RS-232 receiver output. For the MAX3131, R2OUT is always internally connected to the
RS-232 receiver output.
MAX3130/MAX3131
3
3
T2IN
4
—
IRMODE
—
5
6
7
8
9
10
11, 18
12
13
14
15
16
17
19
20
21
22
23
24
25
26
27
4
5
6
7
8
9
10
11, 18
12
13
14
15
16
17
19
20
21
22
23
24
25
26
27
TXD
R1OUT
R1IN
T1OUT
BAUD16
GND
V
CC
N.C.
AV
CC
AGND
PINC
IRSD
PGND
LEDC
V+
C1+
C1-
C2+
C2-
V-
RSSD
T2OUT
R2IN
28
28
R2OUT
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7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
