• 0471-2471601

    24x7 phone assistance

  • Fast Delivery

    All product safe

Member Login

Welcome back, friend. Login to get started

Member Register


Add a Review

Image Alternative text Image Alternative text Image Alternative text

MAX232

18

The MAX232 IC is used to convert the TTL/CMOS logic levels to RS232 logic levels during serial communication of microcontrollers with PC. The controller operates at TTL logic level (0-5V) whereas the serial communication in PC works on RS232 standards (-25 V to + 25V). This makes it difficult to establish a direct link between them to communicate with each other.

  • Meets or Exceeds TIA/EIA-232-F and ITU Recommendation V.28
  • Operates From a Single 5-V Power Supply With 1.0-µF Charge-Pump Capacitors
  • Operates up to 120 kbit/s
  • Two Drivers and Two Receivers

The intermediate link is provided through MAX232. It is a dual driver/receiver that includes a capacitive voltage generator to supply RS232 voltage levels from a single 5V supply. Each receiver converts RS232 inputs to 5V TTL/CMOS levels. These receivers (R1 & R2) can accept ±30V inputs. The drivers (T1 & T2), also called transmitters, convert the TTL/CMOS input level into RS232 level.

 

The transmitters take input from controller’s serial transmission pin and send the output to RS232’s receiver. The receivers, on the other hand, take input from transmission pin of RS232 serial port and give serial output to microcontroller’s receiver pin. MAX232 needs four external capacitors whose value ranges from 1µF to 22µF.

 

Microcontroller

MAX232

RS232

Tx

T1/2 In

T1/2 Out

Rx

Rx

R1/2 Out

R1/2 In

Tx

 

 

PIN diagram:

Pin Description of MAX232

Pin Description: 

 

Pin No

Function

Name

1

Capacitor connection pins

Capacitor 1 +

2

Capacitor 3 +

3

Capacitor 1 -

4

Capacitor 2 +

5

Capacitor 2 -

6

Capacitor 4 -

7

Output pin; outputs the serially transmitted data at RS232 logic level; connected to receiver pin of PC serial port 

T2 Out

8

Input pin; receives serially transmitted data at RS 232 logic level; connected to transmitter pin of PC serial port

R2 In

9

Output pin; outputs the serially transmitted data at TTL logic level; connected to receiver pin of controller.

R2 Out

10

Input pins; receive the serial data at TTL logic level; connected to serial transmitter pin of controller.

T2 In

11

T1 In

12

Output pin; outputs the serially transmitted data at TTL logic level; connected to receiver pin of controller.

R1 Out

13

Input pin; receives serially transmitted data at RS 232 logic level; connected to transmitter pin of PC serial port

R1 In

14

Output pin; outputs the serially transmitted data at RS232 logic level; connected to receiver pin of PC serial port

T1 Out

15

Ground (0V)

Ground

16

Supply voltage; 5V (4.5V – 5.5V)

Vcc

 

The MAX232 IC is used to convert the TTL/CMOS logic levels to RS232 logic levels during serial communication of microcontrollers with PC. The controller operates at TTL logic level (0-5V) whereas the serial communication in PC works on RS232 standards (-25 V to + 25V). This makes it difficult to establish a direct link between them to communicate with each other.

Related Products

Image Alternative text
HC05 Wireless Bluetooth RF Transceiver Module Serial TTL
  • 274
  • 304
Image Alternative text
NEW RASPBERRY PI 3 MODEL B - 1.2GHz QUAD-CORE, 1GB RAM, inbuilt WiFi & Bluetooth
  • 2790
  • 3100
Image Alternative text
DC-DC Buck Converter Step Down Module LM2596 Power Supply Output 1.25V-35V
  • 90
  • 100
Image Alternative text
1N4007 - General Purpose Rectifier Diode
  • 1
  • 1
Image Alternative text
2P4M SCR THYRISTOR
  • 13
  • 14
Image Alternative text
CHAIN TRACK BELT DRIVE MECHANISM for ROBOTs
  • 749
  • 832