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bus communication transceiver

A bus communication and transceiver technology, applied in the field of bus communication transceivers, can solve problems such as duty cycle changes, and achieve excellent real-time characteristics.

Active Publication Date: 2018-05-11
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, changes in the duty cycle are sometimes caused by changes in the total load connected to the bus

Method used

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  • bus communication transceiver
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Examples

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Effect test

no. 1 example

[0023] Figure 1A is a block diagram schematically showing a configuration example of the bus communication transceiver LTr and the bus LBS in the first embodiment. will refer to Figure 1A The components of the bus communication transceiver LTr and bus LBS shown are described.

[0024] exist Figure 1A The bus communication transceiver LTr shown in includes a transmission signal input node TX, a transmission circuit part TXC, a bus connection node LBT, a reception circuit part RXC, a reception signal output node RX, a delay time measurement circuit part DTM, a slave resistor IsS, and first diode D1. The transmission circuit section TXC includes an output waveform adjustment circuit section OWR and an output circuit section OPC. The output circuit part OPC includes a second diode D2 and an N-channel type transistor N1. The bus LBS comprises a bus common main resistance IsM and a capacitance C which is the total bus capacitance including the capacitances of all loads conne...

no. 2 example

[0068] Figure 4 is a circuit diagram schematically showing the configuration of the bus communication transceiver LTr in the second embodiment, particularly, the delay time measurement circuit section DTM and the output waveform adjustment circuit section OWR. It should be noted that since the overall configuration of the bus communication transceiver LTr and the bus LBS in the second embodiment is the same as that in Figure 1A The same as the first embodiment shown in , so the description is omitted.

[0069] exist Figure 4 The configuration of the bus communication transceiver LTr in the second embodiment shown in the Figure 1B The configuration of the bus communication transceiver LTr in the first embodiment shown in is almost the same and different points will be described below. That is, the bus communication transceiver LTr in the second embodiment is the same as the configuration formed by adding the second inverter INV2 and the fourth switch SW4 to the bus commu...

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Abstract

A bus communication transceiver measures a delay time in response to a rising time of a signal and and adjusts a falling waveform of the same signal based on the measurement result. A signal waveform, especially, a duty ratio can be adjusted in a predetermined standard range. Also, the bus communication transceiver realizes an excellent real-time operation, without receiving influence of a variation of the voltage supplied to the bus, and a variation of a total of loads connected with the bus. The bus communication transceiver measures the delay time by using the signal and adjusts the waveform of the signal.

Description

technical field [0001] The present invention relates to a bus communication transceiver, and more particularly, to a bus communication transceiver capable of being connected to a single-wire bus. Background technique [0002] A network protocol used when performing communication through a single-wire bus such as LIN (Local Interconnect Network) is known. In the case of LIN, the network is mainly installed on cars and used to control various devices such as door mirrors and door locks. [0003] In LIN, waveforms of signals to be input to and output from the bus are normalized to satisfy various conditions. The duty cycle is included in these conditions and is the ratio of the time for a signal higher than a predetermined voltage to the time for a signal lower than a predetermined voltage. The duty cycle varies according to changes in the environment of the LIN, and there are cases where the signal wavelength deviates from the standard range. [0004] In the case of LIN, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/296
CPCH04L25/026H03K6/04H04L7/00H04L7/0045H04L25/06
Inventor 木内秀树
Owner RENESAS ELECTRONICS CORP