MIKROE-223 mikroElektronika, MIKROE-223 Datasheet - Page 2

• Manufacturer Part Number: MIKROE-223
• Description: Daughter Cards & OEM Boards MAX232 (MAX232N) ADAPTER BOARD
• Manufacturer: mikroElektronika

Specifications of MIKROE-223

• Rohs: yes
• Description/function: MAX232 Board
• Interface Type: RS-232

MAX232 Board
MAX232 Board
A standard serial interface RS232C for a PC uses voltage levels in a range between -12V and +12V. For the serial signal used by
this standard, a voltage ranging between -3 and -12V stands for a logic one (1), whereas a voltage in a range between +3V and
+12V stands for a logic zero (0). In order to adjust this signal to voltage levels present on the microcontroller pins (TTL standard),
it is necessary to use a voltage level converter. The MAX232 board features a built-in circuit MAX232 used to perform necessary
adjustment. This circuit is powered with a single 5V voltage. It is used to convert a serial signal from TTL to RS232C standard and vice
versa by means of a built-in voltage generator.
There are two connectors provided on the MAX232 board. The female connector DB9 enables connection with devices that use
RS232 standard (usually a PC), whereas the 6-pin connector enables connection with the microcontroller pins intended for serial
communication (USART).
Figure 2: MAX232 board connected to a development system via
Figure 1: MAX232 additional board
proto board
The MAX232 additional board can be connected to a microcontroller provided on the development system. In this case, a PROTO
board should be used for connection with the development system’s I/O port. If the MAX232 board is connected to some other device,
the connection is established via the appropriate 6-pin female connector or a flat cable.
The board is connected to a PC via a standard serial cable provided with a pair of male-female connectors DB9.
Figure 3: MAX232 board connection schematic
MikroElektronika