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CAN module and method therefor

A CAN bus and signal technology, applied in the field of controller area network modules, can solve the problem of different rise time and fall time

Active Publication Date: 2018-05-11
NXP USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the physical layer open-drain topology of a typical CAN driver means that the rise and fall times of the voltage levels on the CAN bus channel 120 can vary significantly, causing asymmetric durations for bit states

Method used

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  • CAN module and method therefor
  • CAN module and method therefor
  • CAN module and method therefor

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Embodiment Construction

[0050] Example embodiments will now be described with reference to the accompanying drawings. It is to be understood, however, that the invention is not limited to the particular embodiments described herein and shown in the accompanying drawings, and that it will be apparent to those skilled in the art that modifications may be made without departing from the inventive concept. Various modifications and variations.

[0051] see now figure 2 , a simplified block diagram of part of a controller area network (CAN) module 200 is shown. The transceiver assembly 220 of the CAN module 200 includes a transmission path arranged to receive a digital transmission command signal 212 from the CAN controller 210 of the CAN module 200, and to transmit the signal received via the digital transmission command signal 212 on the CAN bus 230. The data. The transceiver assembly 220 additionally includes a receive path including a receiver assembly 260 arranged to generate a received data sign...

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Abstract

A CAN module comprises a bit duration compensation component arranged to generate a compensated transmit command signal for controlling a driver component to drive a dominant state on a CAN bus. The compensated transmit command signal comprises the dominant bits of a compensated-bit duration Tbit_cp=Tbit_Tx+tc, wherein tc comprises a compensation offset derived at least partly from a difference between the transmit-bit duration of a digital transmit command signal and the receive-bit duration of a received data signal.

Description

technical field [0001] The present invention relates to a Controller Area Network (CAN) module and a method of driving a dominant state on a CAN bus. Background technique [0002] Controller Area Network (CAN bus) is a communication standard designed to allow microcontrollers and devices to communicate with each other in hostless applications. CAN-FD (Flexible Data Rate) is an extension of the CAN standard that was developed to improve the achievable bandwidth of CAN networks. [0003] The bit rate requirement for the CAN-FD network is faster than that of the standard CAN network, where the current requirement is 5 Mbps and higher rates are planned in the future. In order to achieve the current 5Mbps data rate, a maximum transmission bit width (t_bit) of 200ns is required. [0004] figure 1 The bit transmission on the CAN bus is schematically shown. A logic state is shown at 110 that is provided to the CAN driver and is to be transmitted on the CAN bus. The voltage leve...

Claims

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Application Information

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IPC IPC(8): H04L12/40
CPCH04L12/40006H04L2012/40215G06F13/4286G05B2219/25032H04L12/4013H04L12/40169H04L12/4135H04B3/06H04L25/0286H04L12/40013
Inventor 洛朗·塞加拉菲利浦·瓜耶内克西蒙·贝特朗
Owner NXP USA INC
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