MAX3131EAI+ Maxim Integrated Products, MAX3131EAI+ Datasheet

IC TXRX W/RS232 28-SSOP

MAX3131EAI+

Manufacturer Part Number
MAX3131EAI+
Description
IC TXRX W/RS232 28-SSOP
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet

Specifications of MAX3131EAI+

Number Of Drivers/receivers
2/2
Protocol
RS232
Voltage - Supply
3 V ~ 5 V
Mounting Type
Surface Mount
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-1402; Rev 0; 11/98
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.
Personal Digital Assistants (PDAs)
Palmtop Computers
Battery-Powered Systems
Hand-Held Equipment
Peripherals
IrDA Applications
Cellular Phones
3V to 5.5V, IrDA Infrared Transceiver with
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Integrated RS-232 Interface
MAX3130CAI
MAX3130EAI
MAX3131CAI
MAX3131EAI
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
( ) ARE FOR MAX3131
TOP VIEW
PART
EDGEDET (RXD)
IRMODE (TXD)
BAUD16
R1OUT
T1OUT
AGND
AV
PINC
R1IN
T1IN
T2IN
GND
N.C.
V
CC
CC
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
10
11
12
13
14
1
2
3
4
5
6
7
8
9
0°C to +70°C
0°C to +70°C
Ordering Information
MAX3130
MAX3131
SSOP
Pin Configuration
28
27
26
25
24
23
22
21
20
19
18
17
16
15
28 SSOP
28 SSOP
28 SSOP
28 SSOP
PIN-PACKAGE
R2OUT
R2IN
T2OUT
RSSD
V-
C2-
C2+
C1-
C1+
V+
N.C.
LEDC
PGND
IRSD
Features
1

Related parts for MAX3131EAI+

MAX3131EAI+ Summary of contents

Page 1

... Palmtop Computers Battery-Powered Systems Hand-Held Equipment Peripherals IrDA Applications Cellular Phones ________________________________________________________________ Maxim Integrated Products 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. Integrated RS-232 Interface Integrated RS-232 and IrDA in Single 28-Pin SSOP Package 370µ ...

Page 2

IrDA Infrared Transceiver with Integrated RS-232 Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0. AGND .........................................................-0. .......................................................................±0. AGND, PGND to GND ........................................................±0. ...

Page 3

IrDA Infrared Transceiver with ELECTRICAL CHARACTERISTICS (continued 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1 values are +25°C and ...

Page 4

IrDA Infrared Transceiver with Integrated RS-232 Interface ELECTRICAL CHARACTERISTICS (continued 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1 values are +25°C and ...

Page 5

IrDA Infrared Transceiver with Integrated RS-232 Interface ( 3.3V, GND = AGND = PGND, C1–C4 = 0.1µ RXD OUTPUT PULSE WIDTH vs. DISTANCE (115.2 kbps) 4.0 TRANSMITTER POWER = 200mW/sr INPUT ...

Page 6

IrDA Infrared Transceiver with Integrated RS-232 Interface ( 3.3V, GND = AGND = PGND, C1–C4 = 0.1µ RXD OUTPUT vs. INFRARED INPUT MAX3130 toc13 2V/div 2V/div 2 s/div V = 3.3V, ...

Page 7

IrDA Infrared Transceiver with PIN NAME MAX3130 MAX3131 3 3 T2IN IRMODE 4 — — 4 TXD 5 5 R1OUT 6 6 R1IN 7 7 T1OUT 8 8 BAUD16 9 9 GND 11, ...

Page 8

IrDA Infrared Transceiver with Integrated RS-232 Interface MAX3130 LOGIC INPUTS CONTROL INPUTS RSSD IRMODE IRSD T1IN T2IN RS-232 IrDA Input Input RS-232 IrDA Input Input RS-232 RS-232 Input ...

Page 9

IrDA Infrared Transceiver with C1+ C1 C1- C2+ C2 C2- R1OUT RECEIVE LOGIC OUTPUTS R2OUT T1IN TRANSMIT LOGIC INPUTS T2IN 232 IRMODE IR Rx BAUD16 ENDEC RxIN f BAUD16 ON IRSD BIAS OFF Figure 1. MAX3130 Functional ...

Page 10

IrDA Infrared Transceiver with Integrated RS-232 Interface C1+ C1 C1- C2+ C2 C2- R1OUT RS-232 RECEIVE LOGIC R2OUT OUTPUTS T1IN RS-232 TRANSMIT LOGIC T2IN INPUTS IrDA TRANSMIT TXD LOGIC INPUT RXD IrDA RECEIVE LOGIC Rx TxIN BAUD16 ...

Page 11

IrDA Infrared Transceiver with 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 ...

Page 12

IrDA Infrared Transceiver with Integrated RS-232 Interface T2IN (TXD) 7CS INFRARED LED OUTPUT * CS = BAUD16 CLOCK CYCLES * HIGH = INFRARED LIGHT PULSE ( ) ARE FOR MAX3131 Figure 3b. ENDEC Operation, Transmitting Infrared 1µs ...

Page 13

IrDA Infrared Transceiver with Power dissipation of the MAX3130/MAX3131, IR LED, and R are based on the maximum LED current and SET duty cycle. Use the following equations to calculate the power dis- sipation in each component: ...

Page 14

IrDA Infrared Transceiver with Integrated RS-232 Interface Table 2. Required Capacitor Values V (V) C1 (µF) CC 3.0 to 3.6 0.1 4.5 to 5.5 0.047 3.0 to 5.5 0.1 STANDARD NON-IrDA P 232 IrDA I/O Figure 4. ...

Page 15

IrDA Infrared Transceiver with Chip Information TRANSISTOR COUNT: 1039 ________________________________________________________Package Information ______________________________________________________________________________________ Integrated RS-232 Interface 15 ...

Page 16

... 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. ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 16 © ...

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