IIC bus interface electrostatic protection circuit

An electrostatic protection, bus interface technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. Elevated effect

Inactive Publication Date: 2015-08-05
GUANGDONG CORRECTITUDE POWER CURRENCY ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even after the above measures are taken, in actual use and during electrostatic discharge tests, it is found that the IIC interface of the MCU or peripheral devices is often damaged by static electricity
And this kind of damage is usually permanent, even if the power is turned on again after a power failure, it cannot be recovered

Method used

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  • IIC bus interface electrostatic protection circuit
  • IIC bus interface electrostatic protection circuit

Examples

Experimental program
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Embodiment Construction

[0009] Such as figure 2 , the electrostatic protection circuit of the IIC bus interface is characterized in that: a transient suppression diode (TVS tube) is set on both the SCL (serial clock line) and the SDA (serial data line) of the IIC bus to the ground, the The breakdown voltage value of the TVS tube is less than the limit voltage of the protected IIC interface, and greater than the normal working voltage of the IIC interface. For example: when the 24C512 chip is applied at 3.3V voltage, the maximum limit voltage of its IIC interface is 6V, at this time, the protection voltage value of the TVS tube can be selected to be 5V. The corresponding TVS tube model can be GBLC05C, its breakdown voltage is 5V, and the junction capacitance is 3pF at 1MHz, the capacitance of the junction capacitance will not affect the normal communication of IIC.

[0010] When static electricity is conducted to the IIC interface, the IIC interface will generate high voltage to the ground, and the ...

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Abstract

The invention discloses an IIC bus interface electrostatic protection circuit which is characterized in that SCL and SDA two lines of an IIC bus are respectively provided with a grounded TVS diode; and when static electricity is conducted to an IIC bus interface, the IIC bus interface generates a high voltage to the earth, and the TVS diode can immediately work a protection function to prevent the interface from being damaged due to rising of IIC bus interface voltage, and thus the circuit plays an electrostatic protection function on the IIC bus interface.

Description

technical field [0001] The invention relates to an electronic circuit with an IIC bus interface, in particular to an electrostatic protection circuit for the IIC interface of a component. Background technique [0002] At present, a large number of peripheral devices with IIC interfaces are used in embedded systems to communicate with microprocessors, such as EEPROM chips, Flash chips, clock chips, etc., all of which provide IIC bus interfaces. In practical applications, the IIC interface of the microcontroller (MCU) is connected to the IIC interface of the peripheral device to realize the master-slave communication function. [0003] At present, the anti-interference miss of external components is very scarce. Usually, the measure of wrapping the IIC communication line with pull-up resistors, decoupling capacitors and PCB ground network is mainly used to increase the anti-interference ability, such as figure 1 . However, measures such as setting pull-up resistors, decoupli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 廖志梅
Owner GUANGDONG CORRECTITUDE POWER CURRENCY ELECTRIC CO LTD
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