SP3485 Low Power Half-Duplex RS-485 Transceiver

2 November 2022 - 0 Comments

SP3485 Transceiver

SP3485 Transceiver Pinout

The SP3485 is a 3.3V powered, half-duplex, low-power RS-485 transceiver that fully meets the requirements of the TIA/EIA-485 standard. The SP3485 includes a driver and a receiver, both of which can be independently enabled and disabled. When both are disabled, both the driver and the receiver output a high-impedance state. The SP3485 has a 1/8 load that allows 256 SP3485 transceivers to be connected to the same communication bus. Error-free data transfer of up to 12Mbps is possible. The SP3485 operates from a voltage range of 3.0 to 3.6V and features fail-safe, over-temperature protection, current limit protection, overvoltage protection, and other functions.

SP3485 Pinout Configuration

Pin	Name	Function
1	RO	Receiver output
2	RE	Receiver output enable active LOW
3	DE	Driver output enable active HIGH
4	DI	Driver input
5	GND	Ground connection
6	A	Non-inverting driver output / receiver input
7	B	Inverting driver output / receiver input
8	Vcc	Positive supply

Features

RS-485 and RS-422 transceiver
Operates from a single 3.3V supply
Interoperable with 5.0V logic
Driver/receiver enable
-7V to +12V common-mode input voltage range
Allows up to 32 transceivers on the serial bus
Compatibility with industry-standard 75176 pinout
Driver output short-circuit protection

Absolute Maximum Ratings

VCC 6.0V
Input Voltages
- Logic -0.3V to 6.0V
- Drivers -0.3V to 6.0V
- Receivers ±15V
Outputs
- Drivers ±15V
- Receivers -0.3V to 6.0V
Storage Temperature -65˚C to 150˚C
Maximum Junction Temperature, TJ 125˚C
Power Dissipation 600mW (derate 6.90mW/°C above 70°C)
ESD Rating Human Body Model (HBM) ±2kV

SP3485 Equivalent RS-485 Transceiver ICS

SP3481, UIMAX3485, MAX3485

Other RS-485 Transceiver

MAX485, SP485

Note: Complete technical details can be found in the SP3485 datasheet at this page’s end.

How To Use SP3485?

The SP3485 is a member of the family of 3.3V low-power half-duplex transceivers that meet the electrical specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with the MaxLinear SP481, SP483, and SP485 devices. The image below shows the typical application diagram for the SP3485.

SP3485 Application Circuit Diagram