RS485 Shield for OLEDUINO v2
This is a fault protected RS485 shield for OLEDUINO-V2, SN65HVD1782 chip used as RS485 transreceiver, designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring faults, connector failures, cable crushes, and tool mis-applications. The devices are also robust to ESD events with high levels of protection to the human-body-model specification.
This is a fault protected RS485 shield for OLEDUINO-V2, SN65HVD1782 chip used as RS485 transreceiver, designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring faults, connector failures, cable crushes, and tool mis-applications. The devices are also robust to ESD events with high levels of protection to the human-body-model specification.
The devices combine a differential driver and a differential receiver, which operate from a single power supply. In the SN65HVD1782, the driver differential outputs and the receiver differential inputs are connected internally to form a bus port suitable for half-duplex (two-wire bus) communication. These devices are characterized from–40°C to 125°C. These devices are fully compliant with ANSI TIA/EIA 485-A with a 5V supply and can operate with a 3.3V supply with reduced driver output voltage for low power applications.
It can be paired with the OLEDUINO-V2, enabling the creation of a miniature RS485 interface with OLED display.
Features
- Power Supply 5V (Supports 3.3V)
- Screw Terminal for RS485 Connections
- PCB Dimensions 25.4 x 25.4 mm
Connections
- CN1: Pin 1 = RS485 Channel B, Pin 2 = RS485 Channel A
- CN2: Optional
Arduino vs RS485 Connections
- Digital Pin D10 = RO/Receiver Output
- Digital Pin D02 = RE/Receiver Enable
- Digital Pin D03 = DE/Transmitter Enable
- Digital Pin D11 = DI/Data Input
Schematic
Parts List
| NO. | QNTY. | REF. | DESC. | MANUFACTURER | SUPPLIER | SUPPLIER PARTN NO |
|---|---|---|---|---|---|---|
| 1 | 1 | CN1 | 2 PIN SCREW TERMINAL PITCH 5.08MM | PHOENIX | DIGIKEY | 277-1247-ND |
| 2 | 1 | CN2 | 4 PIN MALE HEADER OPTIONAL | WURTH | DIGIKEY | 732-5317-ND |
| 3 | 1 | C1 | 100nF/50V CERAMIC SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 4 | 4 | R1,R2,R3,R4 | 10K 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 5 | 3 | U3,R5,R11 | DNP | DIGIKEY | ||
| 6 | 1 | R6 | 120E 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 7 | 4 | R7,R8,R9,R10 | 0E 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
| 8 | 1 | U1 | 10 PIN FEMALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-2859-ND |
| 9 | 1 | U2 | SN65HVD08 SOIC8 | TI | DIGIKEY | 296-23802-1-ND |
| 10 | 2 | U1 | 8 PIN FEMALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-61300811821-ND |
Connections
Gerber View
Photos
