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Method for daisy chain communication circuit transmission current testing

A technology for transmitting current and communication circuits, which is applied in the field of daisy chain communication circuit transmission current testing, which can solve the problems of lack of evaluation methods for anti-interference ability, and achieve the effects of avoiding test damage, reducing test costs, and preventing current backflow

Active Publication Date: 2021-03-12
BEIJING MXTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the daisy chain communication circuit has a relatively strong anti-interference ability, it lacks a method for judging this anti-interference ability. Through the test of the transmission current of the daisy chain communication circuit and the flipping threshold, the anti-interference ability can be judged intuitively

Method used

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  • Method for daisy chain communication circuit transmission current testing

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Embodiment

[0024] (1) DC power V0 is preset to 30V, DC power V1 is preset to 0V, DC power V2 is preset to 30V, the maximum output of DC power V1 is 10V, R1 is 10K, the maximum output of DC power V2 is 50V, and R2 is 20K , R0 chooses 10K, D1 and D2 choose Schottky diodes, the conduction voltage drop is about 0.3V, and ammeters A1, A2, A3 and A4 choose 1mA range;

[0025] (2) Power on the DC power supplies V0, V1, and V3 in sequence;

[0026] (3) Record the indication values ​​of the ammeters A2 and A3 after power-on, which are 58uA and 60uA respectively, which are the values ​​of the current transmitted by the daisy chain from bottom to top and from top to bottom when the logic is low;

[0027] (4) Gradually adjust the output voltage of DC power supply V1 upwards. When V1 is adjusted to about 1.5V, the value of ammeter A1 is 120uA. At this time, the value of ammeter A2 changes from 58uA to 190uA. Record the value of A1 at this time by The flipping threshold current of the daisy chain inp...

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Abstract

The invention discloses a method for daisy chain communication circuit transmission current testing. According to the method, a single tested circuit is configured to be in a slave mode; a direct-current power supply is connected with a diode and a current-limiting resistor in series to apply voltage to a daisy chain input port, so that a controllable current source can be formed; the current of the port onto which the voltage is applied is observed by using an ampere meter, and the current of the output port corresponding to the port is observed by using the ampere meter; and the magnitude ofthe applied voltage is gradually adjusted, and the current of input and output ports are observed. According to the method of the invention, the problem that the daisy chain circuit communication current is difficult to test is effectively solved, and the communication current can be tested by just using a single circuit and a common instrument with no cascade modes needed; according to the method, high logic, low logic and overturning threshold current values in a communication process can be observed, and the anti-interference capability of a daisy chain communication circuit can be visually reflected through test results.

Description

technical field [0001] The invention relates to a method for testing the transmission current of a daisy chain communication circuit, in particular to a method for testing the magnitude of the daisy chain transmission current and the flipping threshold. Background technique [0002] The daisy chain communication circuit transmits signals by current, and is often used in battery monitoring chips that work in cascaded mode. In the battery management system, the battery pack is generally composed of dozens of lithium-ion batteries in series. If a 6-channel battery monitoring chip is used for design, a large number of chips are required to be cascaded. Each chip is in a different voltage domain. work, and in the application environment of the battery management system, its frequent high-power charging and discharging conditions cause serious electromagnetic interference. In order to save system costs and increase anti-interference capabilities, the daisy chain interface that tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 胡文瑞王秀芝孔瀛田岭莫艳图崔旭彤王艳翔王立鹏柏晓鹤
Owner BEIJING MXTRONICS CORP
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