Questions tagged [transceiver]
For questions about devices that are both transmitters and receivers.
236
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3
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2
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Difference between Single-supply and Dual-supply CAN Transceiver
I was about to choose the MCP2558FD CAN Transceiver for a personal project. I found on the datasheet the following diagram:
If my understanding is good, I can use it as a dual-supply Transceiver.
But ...
- 144
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2
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76
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What is the purpose of the choke inductor coil in this qrp radio transmitter?
After building and testing these circuits, I want to understand the purpose of the choke coil in these qrp trans(ceiver)mitter circuits.
https://www.qsl.net/py2ohh/trx/curumim/curumim.htm
I ...
- 13
1
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3
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108
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Do I need to put a ferrite bead near a RS485 receiver device power pin?
I'm using a MAX3094ECSE+ RS-422/485 receiver receiver datasheet for an application that is receiving quadrature encoder wires. Those wires are power, positive and negative signals from quadrature ...
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49
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What is the operation of this RS485 transceiver having this connection?
I am confuse with the R1 and R2 function. The "Direct Connection" wire is connected to another transceiver's DE/RE.
When the DE/RE is high, driver is enabled, and when the DE/RE is low, the ...
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2
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1
answer
38
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How to connect a full duplex line driver
I need to use two line drivers for the communication between two PCBs. I am currently using MAX3081 from Analog and this is what I see in the datasheet:
Image Source: Analog - MAX3080-MAX3089 ...
- 115
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0
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46
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Is it possible to use RF signal wires to let a model car center itself on it using phase differences?
I'm looking for a way to let a model car (1/24 to 1/18) know how centered it is on a road. I thought about using a buried wire in the middle of each lane of the road. Would it be possible to detect ...
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3
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4
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239
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MAX3232 capacitors voltage rating
I'm having a doubt about the voltage rating of the capacitors of the RS3232 (a UART to RS232 transceiver).
For C3 and C4 (storing the +- voltage rails for the transceiver), the never exceed voltages ...
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1
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83
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Can USB-to-SERIAL dongle be used to drive an RS-485 transceiver?
Pictured below is a simple arrangement used to read the Temperature sensor from the PC. Standard/Protocol is MODBUS RTU RS-485 Half-Duplex.
I've used this arrangement with both modpoll.exe and ...
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1
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68
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WiFi Transmitter/Receiver [closed]
I want to create a small, battery-powered electronic device to detect the presence of AC voltage after a power outage. It would then transmit notifications to that effect.
The two components of the ...
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1
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1
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62
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No light detected from 1310 nm IR optical transceiver AFBR-5813TQZ
I am trying to build a test application circuit for an AFBR-5813TQZ IR (1300 nm) optical transceiver. For now, I am only trying to verify that the transmitter works, so I have breadboarded the ...
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1
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112
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Using transceiver between DALI and microcontroller
Does anyone have experience using a transceiver between a microcontroller and DALI bus? Please see the attached wiring diagram. I am not sure what is wrong with the circuit, but when I measure the ...
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1
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92
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RF design_output impedance of the SX1280 LoRa transceiver
I searched the datasheet of the Semtech SX1280, but I can't find the output impedance of the SX1280 (RFIO's pin). Where can I find it?
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64
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Estimating max total supply current of all CAN transceivers on the bus
I'm designing the devices that should communicate via a long CAN bus (500+ meters). The power (24V) to the devices is delivered via the same bus cable (UTP5e), by the rest 3 pairs.
The limiting factor ...
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3
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Must RS-232 devices use the same logic level?
I want to interface a microcontroller with the RS-232 COM port of my PC.
My PC uses a 75232G IC, which uses +/-12V logic levels as per some multimeter tests.
Currently I'm planning to use the ...
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47
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How do transceivers interact with the Ether bus in classic Ethernet?
I am reading Computer Networks 5th Edition [Tanenbaum/Wetherall] and there is the following diagram section 3.1 about classic Ethernet.
I am a bit confused on how to interpret the physical connection ...
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25
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Noise calculation using RX channel bandwidth
I am working on calculating the thermal noise expected for a long-distance telemetry system based on the RFD900+ radio. According to the documentation, this radio is based on a Silabs1030 ...
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46
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Transceiver VCSEL failure analysis
We've had a number of optical transceivers fail recently and I am trying to track down the cause. It has happened with two different models: HFBR-53A5VSEMZ (now obsolete), and the TSP-D1CH2-C11.
Some ...
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417
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CAN controller with UART interface IC?
Recently I have new request to add CAN interface for communication, but there is no CAN interface in current MCU. Then I found I can add a CAN controller with SPI interface to achieve.
My question is ...
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0
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82
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Operating QSFP-28 at data rate other than 25Gbps per lane
We are designing a custom board for AD9082 and serdes of which are mapped to QSFP-28 port.This board will communicate with FPGA board using QSFP-28 module.
AD9082 and FPGA will linkup using JESD204C ...
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1
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38
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How can I improve my 20m transceiver microphone amplifier?
After weeks (on and off admittedly) of debugging, I finally figured out why my homebrew 20m transceiver was oscillating on transmit.
Despite all attempts to improve grounding (I have a single copper ...
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2
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807
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Why are capacitors and resistors commonly used with CAN High & CAN Low lines?
I often see resistors and capacitors connected to the CAN high and CAN low lines but in my experience, communication between nodes is still functional without these components. Can someone please ...
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3
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585
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How can I design a CAN BUS hardware interface for STM32? (TTL and CMOS issue)
I am designing a PCB based on STM32F446 and I want to include CAN BUS communication. I know I need a transceiver (from CAN_H and CAN_L to TX and RX) and a CAN Controller. I have thought about MCP2551 (...
1
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2
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60
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Kenwood transceiver output to amplifier buzzes when connected [closed]
My fire department uses a Kenwood TK690-H as a base radio. The system was used to (poorly) power 3 in ceiling speakers throughout the station.
Recently, I rewired the paging system in the station with ...
- 225
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246
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What chip is this? I suspect it's a CAN transceiver
I couldn't find this part number after googling.. both chips appear to say:
NXP
A42/3C
EVG000 (or EV0000)
nD921
but it's hard to read. Here's a pic below. I'm guessing they are the NXP TJA1042, ...
- 185
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1
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168
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What conditions can cause a PCB fuse to fail and act as a resistor?
Context: Tx circuit that shoots 24V pulses into a transformer to get 240V out of it. The purpose is to drive a piezoelectric transducer.
The circuit itself has a fuse protecting it at the entrance (...
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167
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CAN bus fault protection
Question:
Is there a way to implement with discrete components the 70V CAN bus fault protection found in some transceivers, such as TCAN1051H-Q1 ?
Background:
We are using the CAN transceiver ...
- 11
0
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0
answers
88
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Ethernet 100 BASE-TX Question
I'm using this Ethernet transceiver PHY to study the working of the RGMII interface.
I just want to understand 2 things.
1. What would be the output and input differential voltage levels on the pins 2,...
user220456
0
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725
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0
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1
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336
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voltage translation 1.8V and 3.3V using passive/active components
I have a chip that operates on 1.8V Vcc and has a digital interface I2C that also obviously outputs 1.8V signals and receives 1.8V signals. The datasheet says anything above 2V on VCC or digital input ...
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113
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Horrible buzzing on custom car bluetooth
I've got an older vehicle that is wired for a CD changer. I'm using a few components to trick it into playing Bluetooth.
Components
MCP2025
Transceiver for car's LIN bus
Regulates voltage (>12V ...
- 143
4
votes
1
answer
748
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Troubleshooting CANbus 2B comms on ESP32-WROVER-based custom PCB (ABOVE WARN, ERR PASSIVE, BUS ERROR)
I am building an ESP32 WROVER-based custom PCB which includes CANbus 2B communications. This PCB is a copycat of my breadboard project.
Though on my breadboard version, the CANbus works like. charm, ...
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312
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CAN bus termination resistor
I'm trying to design a CAN device where the user can select which device is the beginning/end device and activate the 120 ohm resistor accordingly. I've seen some examples using a switch, but I'm ...
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590
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Intra Pair Length Mismatch Tolerance For 12.5Gbps signals
I'm making a high-speed transceiver design and want some direction regarding layout of trace length from P to N. The speeds will be up to 12.5Gbps. I have been informed by a equalizer manufacturer ...
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47
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RFM69HCW Digital IO connection setup
I'm working to setup an RFM69HCW transceiver with an ARM microcontroller. I've read over the datasheet for the RFM69HCW and I see that DIO0 is the interrupt signal, so I've broken that one out, but ...
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736
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RS-485 communication with slave microcontrollers driving addressable LEDs?
I am trying to figure out how to achieve the master-slave configuration shown below.
The aim is to individually address an array of 150 mA LEDs, driven by the IS31FL3265A PWM driver. For this specific ...
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2
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684
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Maxim MAX3485ESA+T vs SP3485EN-L/TR
I have a question about the MAX3485ESA+T RS485 Transceiver.
I ordered a PCB with a MAX3485ESA+T and the project doesn't work. The previous design was with a SP3485EN-L/TR and it worked well, but I had ...
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0
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151
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How to create an RS485-compatible line driver with an adjustable slew rate?
I need to make an RS485 compatible line driver, capable of 12Mbit/s with fast slew rate, but with the capability to reduce the slew rate to about 50ns rise/fall time when operating at lower bitrates.
...
- 736
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1
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36
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Ethernet Transceiver Modem block scheme: 50:50 device in block scheme
This is a system architecture of the Optical Ethernet Transceiver Modem (OETM)
which allows a bidirectional transmission of optical signals and electrical signals (Ethernet). Given an optical input ...
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1
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126
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Invert signal from optical transceiver
I want to achieve electrically HIGH state in this receiver (Vo tag), when there is HIGH state in the fiber. What I get now is 5 V when there is no pulse in the fiber and 0.48 V when there is (RXVCC=5 ...
0
votes
1
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52
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force output on a MAX3232 RS-232 transceiver
I need to probe the output RX (DOUT1/2) nets (connected to one MCU's UART) of a MAX3232 RS232 transceiver, for this I'll use the PCB test points, but I'd also like to "force" logic levels on ...
2
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1
answer
581
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Do P/N matter for Diff Pair Clock Inputs to FPGA?
I have noticed on a schematic for an FMC card that the differential pairs of a differential LVDS oscillator do not match the corresponding FPGA transceiver reference clock pins. I.e. the P/N are ...
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0
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62
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SPI Line Switching for Redundant Design
I am in the process of designing a full-duplex transceiver board. I am using an ATmega328pb uC and a CC1125 radio. This is for a CubeSat project, so in the interest of redundancy, I'm I would like ...
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115
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AX5043 RF XCVR, problem making the automatic frequency control work in GMSK
I am working with the AX5043 RF transceiver from OnSemi.
I am using GMSK, and I am unable to make the automatic frequency control (AFC) work properly.
I am using a bitrate of 2400 bps. To be sure to ...
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0
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1
answer
24
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ENABLE and T/R pins on MAX7032 Tranciever
Last month I started working with electronics a bit. With no previous knowledge and I'm getting into PCB design for many different applications.
That being said please correct me if I misinterpret or ...
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2
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2
answers
667
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What is the simplest 100km RF communication link there is?
I am looking for a technology for sending sporadic bytes over RF hundreds of kilometers away - assume line of sight. What should I look into to do that? What frequency? What modulation? Perhaps what ...
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164
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CAN Transceiver circuit problem with TJA1042T/3
I am a novice designer who recently started designing circuits.
Using the STM32f407VGT MCU operating at 3.3V, using the CAN1TX(PB9) CAN1RX(PB8) pins, the circuit was configured by referring to NXP's ...
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351
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SN75176 with 3.3V
Can I connect the SN75176 RS485 transceiver with a 3.3V microcontroller? The datasheet says that it must be powered with 5V and all inputs / outputs are TTL, but I'm not sure since the minimum high ...
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1
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339
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Data Oversampling Transceivers
I am trying to find more information about data oversampling for transceivers when grabbing/sending a lower speed signal. I am looking into building a fully compliant HDMI 1.4b fpga core, and have ...
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123
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SMPS mode power supply for 868 MHz operation in S2LP
I am trying to design a PCB for 868 MHz operations using S2LP, referring to the schematic from steval fki868v2. I have attached the same here. I would like to use SMPS mode and BALUN for the operation....
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168
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Transceiver IC for radar
I'm trying to build a radar that functions in the ISM bands (433 MHz, 915 MHz, 2.4 GHz and 5.8 GHz). I'm trying to look for RF transceiver ICs that operate in these bands.
Most of the ICs I'm finding ...
