RS485 click 3.3V

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  • MIKROE-989
  • MIKROE-989
Description RS485 click 3.3V  carries the  SN65HVD12  half-duplex, RS-485... more
Product information "RS485 click 3.3V"

Description

RS485 click 3.3V carries the SN65HVD12 half-duplex, RS-485 transceiver from Texas Instruments.  It is designed for balanced data transmission and complies with EIA standards RS-485 and RS-422. The click is designed to run on a 3.3V power supply. RS485 5V click communicates with the target microcontroller over UART interface, with additional functionality provided by the PWM pin on the mikroBUS™ line.

SN65HVD12 features

Internal ESD protection circuits protect the transceiver bus terminals against ±16-kV Human Body Model (HBM) electrostatic discharges and ±4-kV electrical fast transients (EFT).

The SN65HVD1x half-duplex family provides internal biasing of the receiver input thresholds for open-circuit, bus-idle, or short-circuit failsafe conditions, and a typical receiver hysteresis of 35 mV

How the click works

There are four screw terminals on the board Those marked with “+” and “-” are RS485 differential high and differential low communication lines. We added two more terminals for VCC and GND reference if needed for further interfacing. Communication with the board is done using simple UART interface.

Specifications

Type RS485
Applications Board is suitable for Low power RS-485 systems, DTE/DCE interface Packet switching, Local area networks (LNAs), Data concentration, Data multiplexers, Integrated services digital network (ISDN) and more
On-board modules SN65HVD12 differential line transceiver
Key Features On-board Bias and Termination resistors with related jumpers. Simple UART communication interface
Key Benefits Meets or Exceeds the Requirements of ANSI TIA/EIA-485-A
Interface GPIO,UART
Input Voltage 3.3V
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on RS485 click 3.3V corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
  NC 1 AN PWM 16 R/T Receive/transmit
  NC 2 RST INT 15 NC  
  NC 3 CS TX 14 RX UART data receive 
  NC 4 SCK RX 13 TX UART data transmit
  NC 5 MISO SCL 12 NC  
  NC 6 MOSI SDA 11 NC  
Power supply +3.3V 7 3.3V 5V 10 NC  
Ground GND 8 GND GND 9 GND Ground
 

Jumpers and settings

Designator Name Default Position Default Option Description
J1 PWR. SEL. Left 3.3V Do not touch, not selectable by user
J2 Bias Enable ON    
J3 Bias Enable ON    
J4 Term. ON    


If the board is the first node of the RS485 network, all three jumpers J2-J4 should be placed. If the board is a node in the middle, all jumpers should be removed. If the board is the last node of the RS485 network, place only J4 termination jumper.

Downloads

 mikroBUS™ Standard specification 

 LibStock: RS485 click 3.3V library 

 SN65HVD12 datasheet

 RS485 click 3.3V schematic

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