IIC communication filter circuit

A filter circuit and communication technology, applied in the direction of frequency selection two-terminal-to-network, multi-terminal-to-network, etc., can solve the problems of low IIC communication frequency and unguaranteed IIC communication stability.

Active Publication Date: 2021-05-28
WUXI ETEK MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the frequency of IIC communication is low, and the upper limit of high-speed IIC communication frequency is 400KHz
If the communication...

Method used

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  • IIC communication filter circuit

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Embodiment

[0017] figure 1 It is the circuit structure diagram of this embodiment. The IIC communication filter circuit of the present invention includes an RC filter circuit 2, a first inverter group INV1, a second inverter group INV2, a Schmitt trigger SMT1 and a loop 1;

[0018] The first inverter group INV1 includes a number of odd inverters connected in series; the second inverter group INV2 includes a number of odd inverters connected in series; the loop 1 includes a third inverter group INV3 and a tri-state gate 3; The third inverter group INV3 includes a number of even-numbered inverters connected in series;

[0019] The signal output end of the first inverter group INV1 is connected to the signal input end of the second inverter group INV2, and the signal output end of the second inverter group INV2 is connected to the signal input end of the RC filter circuit 2, and the RC filter circuit The signal output terminal of 2 is connected to the signal input terminal of Schmitt trig...

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PUM

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Abstract

An IIC communication filter circuit comprises an RC filter circuit, a first inverter group, a second inverter group, a Schmitt trigger and a loop, the loop is used for improving the steep degree of the output signal edge of the Schmitt trigger; the RC filter circuit is used for filtering burr signals higher than the characteristic frequency; the first inverter group comprises an odd number of inverters which are connected in series; the second phase inverter group comprises an odd number of phase inverters which are connected in series; the loop comprises a third inverter group and a three-state gate; and the third inverter group comprises an even number of inverters which are connected in series. The IIC communication filter circuit can efficiently filter an IIC bus, meanwhile, the steep degree of the output signal edge of a Schmitt trigger is improved, the probability of secondary burrs is reduced, and therefore the stability of IIC communication is guaranteed.

Description

technical field [0001] The invention relates to a filter circuit, in particular to an IIC communication filter circuit. Background technique [0002] IIC communication is a communication bus method widely used today, which is characterized by input and output functions, and multiple devices can share the same group of buses. However, the frequency of IIC communication is low, and the upper limit of high-speed IIC communication frequency is 400KHz. If the communication signal is not suppressed from glitches and high-frequency signals are not filtered out, then the stability of IIC communication cannot be guaranteed. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an IIC communication filter circuit, which can efficiently filter the IIC bus and suppress the glitch of the communication signal, thereby ensuring the stability of the IIC communication. [0004] In order to solve the problems of the technologies descr...

Claims

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Application Information

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IPC IPC(8): H03H11/04
CPCH03H11/04
Inventor 汪东袁敏民汤大勇史良俊
Owner WUXI ETEK MICROELECTRONICS
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