Datasheet

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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

♦ Integrated RS-232 and IrDA in Single 28-Pin SSOP

Package

♦ 370µA Supply Current

♦ IrDA 1.2 Compatible: 2.4kbps to 115kbps

Data Rate

♦ On-Board IR Encoder/Decoder Allows Use of

Non-IrDA UARTs

♦ +3.0V to +5.5V Single-Supply Operation

♦ Meet EIA/TIA-232 Specifications Down to +3V

♦ 200mA, High-Current Infrared LED Drive

♦ 1µA Low-Power Shutdown with RS-232

Receivers Active

MAX3130/MAX3131

3V to 5.5V, IrDA Infrared Transceiver with

Integrated RS-232 Interface

________________________________________________________________

Maxim Integrated Products

R2OUT

R2IN

T2OUT

RSSD

V-

C2-

IRSD

C2+

C1-

C1+

V+

N.C.

LEDC

PGND

PINC

AGND

N.C.

GND

BAUD16

T1OUT

R1IN

R1OUT

IRMODE (TXD)

T2IN

T1IN

EDGEDET (RXD)

SSOP

TOP VIEW

MAX3130

MAX3131

( ) ARE FOR MAX3131

19-1402; Rev 0; 11/98

PART

MAX3130CAI

MAX3130EAI

MAX3131CAI

0°C to +70°C

-40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SSOP

Pin Configuration

Ordering Information

MAX3131EAI -40°C to +85°C 28 SSOP

Summary of content (16 pages)

PAGE 1
9-1402; Rev 0; 11/98 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface Features The MAX3130/MAX3131 combine an IrDA 1.2 compatible 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 highgain/low-noise PIN-diode amplifier with 100µA of ambient photodiode current rejection at a +3V supply.
PAGE 2
MAX3130/MAX3131 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V AVCC to AGND .........................................................-0.3V to +6V VCC to AVCC .......................................................................±0.3V AGND, PGND to GND ........................................................±0.1V V+ to GND ...................................................
PAGE 3
V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface (VCC = AVCC = 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and VCC = AVCC = 3.3V.) PARAMETER CONDITIONS MIN TYP MAX UNITS IR Receiver Disable Time Delay until IAVCC < 1µA 10 µs IR Receiver Enable Time Delay until maximum IR receive data rate is valid 300 µs IR Receiver Output Pulse Width BAUD16 = static (Note 3) Data rate = 2.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VCC = AVCC = 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and VCC = AVCC = 3.3V.) PARAMETER CONDITIONS VCC = 3.
PAGE 5
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface RXD OUTPUT PULSE WIDTH vs. DISTANCE (115.2 kbps) 3.0 2.5 2.0 1.5 1 TRANSMITTER AT 235kbps 1 TRANSMITTER AT 15kbps 2 1 0 -1 -2 -3 -4 VOUT- -5 1.0 0 20 40 60 80 -6 100 0 1000 DISTANCE (cm) 4000 40 MAX3130 toc09 18 1 TRANSMITTER DRIVEN ONLY 35 5000 235kbps 30 -SLEW 12 ICC (mA) SLEW RATE (V/µs) 3000 SUPPLY CURRENT vs.
PAGE 6
MAX3130/MAX3131 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 vs. INFRARED INPUT RXD OUTPUT vs. INFRARED INPUT MAX3130 toc13 2V/div RXD OUTPUT 2V/div INFRARED INPUT 2V/div RXD OUTPUT 2V/div INFRARED INPUT 100µs/div VCC = 3.3V, 2400bps AT 10cm DISTANCE TEMIC BPV22NF TRANSMIT POWER 200mW/sr 2µs/div VCC = 3.3V, 115.
PAGE 7
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface PIN MAX3130 3 MAX3131 3 NAME FUNCTION T2IN 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. IRMODE IR Mode Control. Drive IRMODE low to connect R2OUT to the IR receiver output and T2IN to the IR transmitter input.
PAGE 8
MAX3130/MAX3131 3V to 5.
PAGE 9
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface MAX3130/MAX3131 ON RSSD C1+ C1 SHDN C1- V+ V- CHARGE PUMP C2+ C2 C3 C4 C2R1OUT RECEIVE LOGIC OUTPUTS OFF R1IN 5k RS-232 INPUTS R2IN R2OUT 5k EDGE T1OUT T1IN TRANSMIT LOGIC INPUTS T2IN T2OUT RS-232 OUTPUTS 232 IRMODE IR BAUD16 Rx TxIN ENDEC RxIN Tx EDGEDET EDGE fBAUD16 VCC GND 1µF RSET MAX3130 LEDC PGND PINC ON OFF IRSD BIAS 1.2V AVCC AGND 1µF Figure 1.
PAGE 10
MAX3130/MAX3131 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface ON C1+ C1 C1- V- C3 C4 C2R1OUT RS-232 RECEIVE LOGIC OUTPUTS OFF V+ CHARGE PUMP C2+ C2 RSSD SHDN R1IN RS-232 INPUTS 5k R2IN R2OUT 5k RS-232 TRANSMIT LOGIC INPUTS IrDA TRANSMIT LOGIC INPUT T1IN T1OUT T2IN T2OUT RS-232 OUTPUTS TXD RXD IrDA RECEIVE LOGIC OUTPUT BAUD16 Rx TxIN ENDEC Tx RxIN MAX3131 VCC GND 1µF fBAUD16 RSET LEDC PGND PINC ON OFF IRSD BIAS 1.2V AVCC AGND 1µF Figure 2.
PAGE 11
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface 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 determines 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.
PAGE 12
MAX3130/MAX3131 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface T2IN (TXD) 7CS INFRARED LED OUTPUT * 3CS 16CS CS = BAUD16 CLOCK CYCLES * HIGH = INFRARED LIGHT PULSE ( ) ARE FOR MAX3131 Figure 3b. ENDEC Operation, Transmitting Infrared 1µs and three BAUD16 clock cycles) into a full baud period (Figure 3a). Signals applied to TXD are inverted and compressed to three BAUD16 clock cycles by the ENDEC before being transmitted (Figure 3b).
PAGE 13
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface Use the following equations to calculate the power dissipation in each component: MAX3130 power dissipation = ISET · VDRV · duty cycle IR LED power dissipation = ISET · VIRLED · duty cycle RSET power dissipation = ISET2 · RSET · duty cycle For reliable operation, do not exceed maximum power dissipation of the components. PIN Photodiode Selection PIN photodiode selection is extremely important to system performance.
PAGE 14
MAX3130/MAX3131 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface Table 2. Required Capacitor Values VCC (V) C1 (µF) 3.0 to 3.6 0.1 C2, C3, C4 (µF) 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 STANDARD NON-IrDA UART µP MAX3130 RTS CTS T1IN R1OUT Tx Rx T2IN R2OUT LEDC BAUD16 PINC T1OUT R1IN T2OUT R2IN DB-9 RS-232 1 2 3 4 5 6 7 8 9 IrDA BAUD16 IRMODE 232 IrDA I/O Figure 4.
PAGE 15
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface TRANSISTOR COUNT: 1039 SSOP.
PAGE 16
MAX3130/MAX3131 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface NOTES Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.