Coding trimming circuit and trimming method

Abstract

The invention provides a coding trimming circuit and a coding trimming method of a coding chip. The coding trimming circuit of the coding chip comprises a first signal input end, a second signal inputend and N programming signal output ends, wherein the first signal input end is used to couple a first wafer pad of the coding chip, and the first signal input end is used to receive a first signal;the second signal input end is used to couple a second wafer pad of the coding chip, and the second signal input end is used to receive a second signal; and the N programming signal output ends are used to output N programming signals, wherein N is greater than 2, and the N programming signal output ends are coupled to N fusing circuits in one-to-one correspondence; and by receiving the two signals, the coding trimming circuit of the coding chip controls the states of the N fusing circuits and further burns a code number of the coding chip. According to the scheme, multi-bit coding trimming can be performed by using only two signals, the wafer area and the difficulty of trimming operations can be reduced, and the yield can be increased.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an encoding trimming circuit and trimming method of an encoding chip. Background technique [0002] Each chip in the encoding chip has a unique encoding number (or address number or ID number), such as an encoding chip used for a remote control key, to control different car locks through different encoding numbers. In the prior art, the method for setting the N-bit code number of the encoding chip includes setting N chip pads on the encoding chip, or N trimming points, by performing signal trimming on the N trimming points, Realize the setting of N-bit code number. When the encoding chip has a large number of encoding numbers, it is necessary to arrange a large number of wafer pads on the wafer, which will occupy a large area of ​​the wafer, resulting in an increase in the area of ​​the wafer itself. In addition, the way of trimming the chip pads one by one will increase the complexi...

AI Technical Summary

Problems solved by technology

When the encoding number of the encoding chip has a lot of digits, it is necessary to arrange a large number of wafer pads on the wafer, which will occupy a large area of ​​the wafer, resulting i

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