A kind of led driving chip and led driving circuit

Abstract

The invention discloses an LED driving chip and an LED driving circuit. The driving chip includes a port detection module, an internal control codec module and a PWM display module. The present invention uses the internal control codec module to extract the display data required by the LED driver chip of the current level from the display data stored inside when there is no data input at the input terminal, and output the synchronization code to the LED driver chip of the next level; at the input terminal When the synchronization code is input, according to the corresponding relationship between the preset synchronization code and the internally stored display data, the display data required by the current-level LED driver chip is extracted from the internally stored display data, and the synchronization is output to the next-level LED driver chip code; the PWM display module controls the LED light display according to the display data. Therefore, even if there is a weak soldering of the driver chip, the subsequent driver chips can still control the LED lights to display the content that needs to be displayed according to the corresponding relationship between the synchronization code and the display data, and realize synchronous display, so that the entire display system can continue to display.

Description

technical field [0001] The invention relates to the technical field of LED lamp control, in particular to an LED driving chip and an LED driving circuit. Background technique [0002] At present, in the prior art, the LED driver chips of the serial display system are connected in series step by step, and the external control data (including display data) is transmitted step by step between the LED driver chips of each level. When one or more LED driver chips are in the state of weak soldering, open short circuit, floating, etc., the external control data cannot be transmitted to the next-level LED driver chips, and the subsequent LED driver chips cannot control the LEDs for display. In this regard, the existing LED driver chips have two types of driving technologies to solve the above problems, which are as follows: [0003] Type A is the normal display of the LED driver chip under the control of normal external control data. When the data input terminal is abnormally short...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an LED driver chip and an LED driver circuit, aiming at solving the problem of failure of a certain LED driver chip in the serial display system in the prior art, which causes the failure of the subsequent driver chip. The problem that the connected LED lights cannot be displayed and cannot be displayed synchronously

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