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| can_faq:can_bitrates [2018/08/21 23:08] – external edit 127.0.0.1 | can_faq:can_bitrates [2020/07/25 12:36] (current) – heinz |
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| ===== What are commonly used bit rates? ===== | ===== What are commonly used bit rates? ===== |
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| | **The following is only valid for classical CAN** or may be the arbitration bit rate of CAN FD. CAN FD has a second, the data bit rate. |
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| The most used industrial CAN protocols are using: | The most used industrial CAN protocols are using: |
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| For determining the timing register contents see at: | For determining the timing register contents see at: |
| [[ http://www.can-wiki.info/bittiming/tq.html | CAN Bit Timing Calculator]] | [[ http://www.bittiming.can-wiki.info/ | CAN Bit Timing Calculator]] |
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| Bit rates are programmed by specifying the values of some CAN controller registers, commonly called "bit timing" registers. The time base is typical derived from a quartz oscillator. Although very flexible, not all bit timings are possible. For a successful communication, the nodes at the network should agree on a bit-timing within a certain accuracy. We suggest to use a maximum tolerance of the generated bit frequency of 0.1%. The best would be to use a oscillator frequency of multiples of 8 MHz. (16 or 24 MHz) Using other frequencies is asking for trouble. For a more detailed description application notes from Philips and Bosch are available. | Bit rates are programmed by specifying the values of some CAN controller registers, commonly called "bit timing" registers. The time base is typical derived from a quartz oscillator. Although very flexible, not all bit timings are possible. For a successful communication, the nodes at the network should agree on a bit-timing within a certain accuracy. We suggest to use a maximum tolerance of the generated bit frequency of 0.1%. The best would be to use a oscillator frequency of multiples of 8 MHz. (16 or 24 MHz) Using other frequencies is asking for trouble. For a more detailed description application notes from Philips and Bosch are available. |
