All Questions
Tagged with can transceiver
33
questions
0
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0
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70
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How does CAN transceivers output CANH=3.5V and CANL=1.5V? [duplicate]
This is a questions that has been asked but did not find a clear answer. How it is the 3.5V achieved on CAN_H? Assuming there is 0.5V voltage drop on the internal diode, 0.1V on the internal MOSFET ...
3
votes
2
answers
162
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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 ...
- 154
1
vote
1
answer
85
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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 ...
- 35
2
votes
3
answers
890
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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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3
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2
answers
1k
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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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3
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1k
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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
vote
1
answer
381
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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
2
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3
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323
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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 ...
- 21
4
votes
1
answer
1k
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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, ...
- 222
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0
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409
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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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1
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0
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206
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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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0
votes
2
answers
2k
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CAN bus expander circuit
I am trying to design a CAN bus expander. In this case I could implement star topology of multiple buses in parallel. It would avoid having problems with reflections and delay.
For this purpose I ...
0
votes
0
answers
633
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Normal Mode of CAN Controller in STM32L476 Nucleo Board is Not Working
I am using STM32L476RG Nucleo board which contains only one CAN controller(bx_CAN1) and SN65HVD233 as a CAN Transceiver. I could able to test the CAN controller by using "LOOPBACK Mode".
...
0
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2
answers
387
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SN65HVD232: Will it work if VCC = 5V?
Datasheet - SN65HVD232
Full part no - SN65HVD232D
My schematic -
Hi all, there is a problem in my PCB where 5V track is connected to VCC pin instead of 3.3V. Actual input should be 3.3V as per ...
3
votes
2
answers
1k
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How is a CAN transceiver's common mode voltage range extended?
The CAN Standard states a max. common mode voltage of -2 V to +7 V. There are transceivers however, that allow for e.g. +-25 V common mode voltage range. How is that achieved? I imagine (I do not ...
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