Capacitive touch screen signal receiving circuit

Abstract

The invention discloses a capacitive touch screen signal receiving circuit. The circuit comprises N one-out-of-eight multiplexers, N operational amplifiers and N ten-bit AD converters, wherein one oneone-out-of-eight multiplexer, one operational amplifier and one ten-bit AD converter form a basic unit for receiving one path of signal; the one-out-of-eight multiplexers are enabled to be controlledto input signals for the operational amplifiesr; and a charge transfer method is used for detecting an induction capacitor, the operational amplifiers output following analog signals, the analog signals are converted into binary numbers with the bit width of ten bits through the ten-bit AD converters, and the binary numbers are transmitted to subsequent operation, so that multichannel analog signals are quickly and efficiently received and converted into digital signals in parallel. The capacitive touch screen signal receiving circuit is simple in basic unit structure, simple in repeated structure, high in reliability and high in transmission speed, and sufficient time is reserved for subsequent operation of the whole system.

Description

technical field [0001] The present invention relates to the technical field of capacitive touch screens, in particular to a signal receiving circuit of a capacitive touch screen. Background technique [0002] In the field of large-size capacitive touch screens, in order to ensure that the screen is larger and the resolution is still high, more receiving channels for sensor sensing signals are required, so there are more receiving signals, so quickly receive analog signals and convert them into digital signals. It is very necessary and important to reserve sufficient time for subsequent complex calculation operations, etc., to minimize the touch sensing time and improve the working speed of the device. [0003] For a capacitive touch screen with a large size and a large number of receiving channels, for a circuit in which all channels receive signals in sequence, although the number of components is small and the circuit board area is small, it takes too long and the efficien...

AI Technical Summary

Problems solved by technology

[0003] For a capacitive touch screen with a large size and a large number of receiving channels, for a circuit in which all channels receive signals in sequence, although the number of components is small and the circuit board area is small, it takes too long and the efficiency is very low; for all channels at the same time A circuit that receives signals in parallel can receive and transmit all channel signals in one unit of time, which takes less time, but requires a huge number of components, a large circuit board area, a lot of waste of resources, high cost, and high power consumption

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