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Electrostatic discharge protecting circuit for USB interface chip

A USB interface, electrostatic discharge technology, applied in the field of electrostatic discharge protection circuit, can solve problems such as electrostatic discharge, and achieve effective protection

Active Publication Date: 2010-10-06
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that USB is easy to generate electrostatic discharge during application, the present invention proposes an ESD protection circuit for a USB interface or a chip with a USB interface, that is, the ESD protection circuit for data signal lines DP and DM to power and ground

Method used

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  • Electrostatic discharge protecting circuit for USB interface chip
  • Electrostatic discharge protecting circuit for USB interface chip
  • Electrostatic discharge protecting circuit for USB interface chip

Examples

Experimental program
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Effect test

Embodiment Construction

[0016] figure 1 Explain that the ESD protection circuit 1 used for the USB interface chip protects two PADs (pads) 3 and 7 of the differential data signal, DP2 is decomposed into DP_IN4 and DP_OUT5 after passing through the ESD protection circuit 1, and DM6 is decomposed into DM_IN8 and DM_OUT9.

[0017] figure 2 exist figure 1 On the basis of the ESD protection circuit 1 in , the ESD protection circuit is decomposed into the ESD protection circuit 10 of DP2 and the ESD protection circuit 11 of DM6. The ESD protection circuits 10 and 11 both refer to protection circuits for power supply and ground.

[0018] image 3 The ESD protection circuit of DP2 is given, including the protection resistor 16 between DP2 and DP_IN4, the protection resistor 17 between DP2 and DP_OUT5, the protection circuit 18 of DP2 to the power supply and the protection circuit 19 to the ground, and the protection circuit of DP_IN4 to the power supply The circuit 20 and the protection circuit 21 to t...

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Abstract

The invention provides an electrostatic discharge (ESD) protection circuit for a USB (Universal Serial Bus) interface chip. The communication between a device (device) with a USB interface and a host (host) is achieved through the USB interface, and the USB device is equipped with four pins, i.e. two data lines (DP, DM), a power supply (VCC) and a ground wire (GND). Due to the frequent insertion / removal of the USB device into / from the host, the USB interface chip needs very high ESD resistance. The invention provides a novel on-chip ESD protection circuit for the two data lines of the USB device.

Description

technical field [0001] The invention is an electrostatic discharge protection circuit for a USB interface chip, which is mainly applied to the USB interface chip and chip equipment with the USB interface to resist damage to the chip by static electricity. Background technique [0002] USB (Universal Serial Bus) refers to the Universal Serial Bus, which is an interface technology applied in the PC field. USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies at the end of 1994. At present, USB1.1 and USB2.0 are mainly used in PC motherboards, and the USB versions are very compatible. USB uses a 4-pin plug as a standard plug, and all peripherals can be connected in a daisy chain form, up to 127 external devices can be connected without loss of bandwidth. USB needs the support of host hardware, operating system and peripheral hardware to work. USB has the advantages of fast transmission speed (full speed of USB1.1 is 12Mbps, high speed of USB2.0 is 480...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/00
Inventor 周建锁
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD