Capacitive fingerprint identification chip, mobile terminal and chip control method

Abstract

The invention relates to the semiconductor field, and discloses a capacitive fingerprint identification chip, a mobile terminal and a chip control method; the capacitive fingerprint identification chip comprises an induction array, a first analog-to-digital converter, a second analog-to-digital converter, a data selector, an analog front end AFE and a processing module; the data selector is respectively connected with the first analog-to-digital converter, the second analog-to-digital converter and the processing module. The embodiment also provides the mobile terminal corresponding to the chip and the chip control method; the capacitive fingerprint identification chip has expansion functions.

Description

technical field [0001] The invention relates to the field of semiconductors, in particular to a capacitive fingerprint identification chip, a mobile terminal and a chip control method. Background technique [0002] Capacitive fingerprint identification chips refer to chip products embedded with capacitive fingerprint identification technology, which can realize image acquisition, feature extraction and feature comparison of fingerprints on a chip. , capacitive sensor technology is the use of alternating order and sensor electric plates arranged side by side, the form of alternating plates is two capacitive plates, and the valleys and ridges of the fingerprint become the dielectric between the plates, and the sensor detects the constant dielectric between the two Variations to generate fingerprint images. Through the capacitive fingerprint identification chip, developers can easily realize the function of fingerprint identification, which greatly reduces the threshold of the...

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Problems solved by technology

[0003] However, the inventor found in the process of realizing the present invention that the current capacitive fingerprint recognition chip can only realize a single sensing fingerprint recognition and does not have an expansion function. Other sensing chips also have the problem of single function, so the mobile terminal in When implementing multiple sensing functions, multiple capacitive fingerprint sensing chips need to be used. If sensors with other functions, such as pressure sensors, need to be added to the mobile terminal, a pressure sensor chip needs to be added, which increases the hardware volume of the mobile terminal and makes the terminal The number of chips in the

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