I2C isolation circuit

Abstract

The invention discloses an I2C isolation circuit. The circuit comprises an SLC output control part and an SDA output control part; the SLC output control part comprises an input clock signal SLC_ETC,an input voltage signal VCC_ETC, an input voltage VCC, an input current limiting resistor R1, an input current limiting resistor R2, an N_MOS transistor Q1, an output clock signal SCL and an output current limiting resistor R3; and the SDA output control part comprises an input digital signal SDA_ETC, an input voltage signal VCC_ETC, the input voltage VCC, the input voltage VCC, an input current limiting resistor R4, an input current limiting resistor R5, an N_MOS transistor Q2, an output data signal SDA and an output current limiting resistor R6. Through the N_MOS transistors, the input digital signals SDA_ETC and SDA_ETC are converted into high and low levels of the output signals SCL and SDA, so that the communication response speed of an I2C bus can be guaranteed; when the input clocksignals SCL_ETC and SDA_ETC have high voltages to come, related devices connected with the I2C bus are protected from being not burnt out; and therefore, the circuit has the advantages of high stability, high voltage prevention and low cost.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an I2C isolation circuit. Background technique [0002] I2C is a popular serial protocol for power controllers, ADCs, DACs, EEPROMs, and other devices. In some data acquisition and power control equipment, it is necessary to isolate the I2C master from one or more slaves In order to solve problems such as noise, grounding and safety, the I2C communication of the prior art is that the bus is directly connected to the MCU to send data. When the input clock signal SCL_ETC and the input data signal SDA_ETC of the capacitor have high voltage, the high voltage passes through the I2C bus Direct access to MCU or other devices, resulting in component damage. [0003] Therefore, a technical problem that professional technicians in this field need to solve urgently is: how to innovatively propose a measure to provide an I2C isolation circuit to quickly and safely isolate the I2C signal an...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention discloses an I2C isolation circuit to solve the problem in the prior art that the related devices connected to the I2C bus are burned out when the input signals SCL_ETC and SDA_ETC have high voltage.

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