RS485 click 3.3V

Product Code: MIKROE-989

Brand: MikroElektronika

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₹1,889.00

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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					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.