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PDF MAX3131 Data sheet ( Hoja de datos )
| Número de pieza | MAX3131 | |
| Descripción | 3V to 5.5V / IrDA Infrared Transceiver with Integrated RS-232 Interface | |
| Fabricantes | Maxim Integrated | |
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19-1402; Rev 0; 11/98
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
General Description
The MAX3130/MAX3131 combine an IrDA 1.2 compati-
ble infrared transceiver with an RS-232 interface—all in
a single 3V-powered hybrid microcircuit. The infrared
transceiver supports IrDA data rates of 2.4kbps to
115kbps. The infrared receive channel provides a high-
gain/low-noise PIN-diode amplifier with 100µA of ambi-
ent photodiode current rejection at a +3V supply. A
high-power LED driver capable of sinking 200mA is
included in the infrared transmit path. The on-board
encoder/decoder (ENDEC) compresses/stretches sig-
nals to and from the external UART, allowing IrDA com-
munication even with non-IrDA UARTs.
A 2-driver/2-receiver RS-232 transceiver supports data
rates up to 120kbps. A proprietary, high-efficiency, dual
charge-pump power supply and a low-dropout trans-
mitter combine to deliver true RS-232 performance from
a single +3.0V to +5.5V supply. Selectable shutdown
for IR and RS-232 circuitry reduces supply current to
1µA.
The MAX3130 is optimized for applications using a sin-
gle UART for both infrared and RS-232 communication.
The infrared transmitter input and infrared receiver out-
put are multiplexed with one RS-232 transmitter input
and one RS-232 receiver output, respectively. The
MAX3131’s IrDA transceiver and RS-232 transceivers
are separate and have their own data inputs and outputs.
Both these devices require a minimum of external com-
ponents: four small 0.1µF capacitors, a photodiode, an
infrared LED, and a current-setting resistor.
Applications
Personal Digital Assistants (PDAs)
Palmtop Computers
Battery-Powered Systems
Hand-Held Equipment
Peripherals
IrDA Applications
Cellular Phones
Features
o Integrated RS-232 and IrDA in Single 28-Pin SSOP
Package
o 370µA Supply Current
o IrDA 1.2 Compatible: 2.4kbps to 115kbps
Data Rate
o On-Board IR Encoder/Decoder Allows Use of
Non-IrDA UARTs
o +3.0V to +5.5V Single-Supply Operation
o Meet EIA/TIA-232 Specifications Down to +3V
o 200mA, High-Current Infrared LED Drive
o 1µA Low-Power Shutdown with RS-232
Receivers Active
Ordering Information
PART
MAX3130CAI
MAX3130EAI
MAX3131CAI
MAX3131EAI
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
28 SSOP
28 SSOP
Pin Configuration
TOP VIEW
EDGEDET (RXD) 1
T1IN 2
T2IN 3
IRMODE (TXD) 4
R1OUT 5
R1IN 6
T1OUT 7
BAUD16 8
GND 9
VCC 10
N.C. 11
AVCC 12
AGND 13
PINC 14
( ) ARE FOR MAX3131
MAX3130
MAX3131
SSOP
28 R2OUT
27 R2IN
26 T2OUT
25 RSSD
24 V-
23 C2-
22 C2+
21 C1-
20 C1+
19 V+
18 N.C.
17 LEDC
16 PGND
15 IRSD
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
Typical Operating Characteristics (continued)
(VCC = AVCC = 3.3V, GND = AGND = PGND, C1–C4 = 0.1µF, RL = 3kΩ, TA = +25°C, unless otherwise noted.)
RXD OUTPUT PULSE WIDTH vs. DISTANCE
(115.2 kbps)
4.0
TRANSMITTER POWER = 200mW/sr
INPUT PULSE WIDTH = 1.63µs
3.5 TEMIC BPV22NF
VCC = 3.3V
3.0
2.5
2.0
1.5
1.0
0
20 40 60 80
DISTANCE (cm)
100
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5 VOUT+
4
3 1 TRANSMITTER AT 235kbps
1 TRANSMITTER AT 15kbps
2
1
0
-1
-2
-3
-4 VOUT-
-5
-6
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
RS-232 TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
18
16
14 -SLEW
12
10
8 +SLEW
6
4
2
0
0 1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
SUPPLY CURRENT vs. LOAD CAPACITANCE
(RS-232 TRANSMITTING)
40
1 TRANSMITTER DRIVEN ONLY
35
235kbps
30
25
120kbps
20
15
20kbps
10
5
0
0
1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
RXD OUTPUT
vs. INFRARED INPUT
MAX3130 toc11
RXD OUTPUT
vs. INFRARED INPUT
MAX3130 toc12
2V/div
RXD
OUTPUT
2V/div
RXD
OUTPUT
2V/div
INFRARED
INPUT
2V/div
INFRARED
INPUT
2µs/div
VCC = 3.3V, 115.2kbps AT 1cm DISTANCE
TEMIC BPV22NF
TRANSMIT POWER 200mW/sr
100µs/div
VCC = 3.3V, 2400bps AT 1cm DISTANCE
TEMIC BPV22NF
TRANSMIT POWER 200mW/sr
_______________________________________________________________________________________ 5
5 Page 
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
IR Transmitter
The infrared transmitter consists of an internal high-
power, open-drain MOSFET switch. This switch has an
on-resistance of less than 2Ω and is capable of switch-
ing 200mA of current. Internal buffering keeps the input
capacitance of the TXD pin extremely low to ease user
drive requirements. Connect an IR LED in series with a
current-setting resistor to select the appropriate IR out-
put power (see the Powering the IR LED section). The
transmitter is not current limited so do not exceed the
power dissipation of the external components during
high duty-cycle transmit schemes.
The TXD input controls the IR LED for the MAX3131.
The T2IN input controls the IR LED for the MAX3130
(IRMODE = low). With the ENDEC disabled (see IrDA
Encoder/Decoder (ENDEC) section), the IR LED is
turned on by a logic-high signal at the TXD or T2IN
input, for the MAX3131 and MAX3130 respectively.
IRMODE: Multiplexed RS-232 Operation
and IrDA Operation (MAX3130)
The MAX3130 has the capability to multiplex R2OUT and
T2IN between the IrDA infrared interface and the RS-232
electrical interface. The state of the IRMODE input deter-
mines which interface (infrared or RS-232) is multiplexed
to R2OUT and T2IN. When IRMODE is low, R2OUT acts
as the infrared receiver output and T2IN acts as the
infrared transmitter input. Also, while IRMODE is low, the
RS-232 charge pumps are shut down and the RS-232
transmitters are disabled (see Shutdown section). When
IRMODE is high, R2OUT and T2IN assume their func-
tions as the RS-232 data receive output and transmit
input, respectively. Also, while IRMODE is high, the IR
transmitter is disabled (turned off).
EDGEDET: Edge-Detection Circuitry
(MAX3130)
The MAX3130 has internal edge-detection circuitry that
monitors the RS-232 R2OUT line when IRMODE is low
and monitors the IrDA receive channel when IRMODE
is high. EDGEDET goes low when a positive or negative
edge is detected on either the RS-232 R2OUT line or
the IrDA receive channel (depending on the IRMODE
pin). This edge-detection feature is useful for initiating
an interrupt when data is received on the deselected
line. The EDGEDET signal is cleared when IRMODE is
toggled. Table 1 shows EDGEDET operation.
IrDA Encoder/Decoder (ENDEC)
The MAX3130 and MAX3131 provide an on-board
ENDEC to communicate with UARTs that are not IrDA
compatible. The ENDEC is enabled by applying a clock
with a frequency 16 times the baud rate to the BAUD16
input. This BAUD16 clock is commonly provided on
UARTs that do not have IrDA ENDEC capability. Figure
3 illustrates the operation of the ENDEC. The ENDEC
stretches the incoming infrared pulse (a pulse between
Table 1. EDGEDET Operation
IRSD RSSD IRMODE R2IN IrDA RxIN EDGEDET*
XX
0
X
XX
0
X
XX 1 X
XX 1 X
X = Don’t care
* EDGEDET is cleared by any transition on IRMODE.
INFRARED
PHOTODIODE INPUT *
1.41µs < t < 3CS
16CS
R2OUT (RXD)
WITH ENDEC DISABLED
R2OUT (RXD)
WITH ENDEC ENABLED
CS = BAUD16 CLOCK CYCLES
* HIGH = INFRARED LIGHT PULSE
( ) ARE FOR MAX3131
16CS
Figure 3a. ENDEC Operation, Receiving Infrared
32CS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX3131.PDF ] | |
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