Title:
KEYBOARD SCANNING CIRCUIT, KEYBOARD KEY RECOGNITION METHOD, CHIP, AND KEYBOARD
Document Type and Number:
WIPO Patent Application WO/2023/116130
Kind Code:
A1
Abstract:
Disclosed in the present application are a keyboard scanning circuit, a keyboard key recognition method, a chip, and a keyboard. The keyboard scanning circuit comprises: a key value detection circuit, which is connected to a keyboard scanning input interface and is used for collecting a first level state corresponding to the keyboard scanning input interface; a state machine jump circuit, which is used for outputting the current keyboard state; and an output decoding circuit, which is connected to the key value detection circuit, the state machine jump circuit and a keyboard scanning output interface, and is used for controlling, when the current keyboard state is an idle state and the first level state jumps from a high level to a low level, the keyboard scanning output interface to perform key scanning. The key value detection circuit is further used for controlling the keyboard scanning output interface to perform key scanning, and then collecting a second level state corresponding to the keyboard scanning input interface; and the output decoding circuit is further used for performing key recognition according to the second level state. The keyboard scanning circuit can realize key scanning and key recognition, has high reliability, and does not need to additionally occupy running resources of a keyboard MCU.
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Inventors:
BU ENHUI (CN)
OUYANG FAN (CN)
YANG LINING (CN)
OUYANG FAN (CN)
YANG LINING (CN)
Application Number:
PCT/CN2022/124481
Publication Date:
June 29, 2023
Filing Date:
October 11, 2022
Export Citation:
Assignee:
XIAN CHIPSEA MICROELECTRONICS TECH CO LTD (CN)
International Classes:
H03M11/20
Foreign References:
| CN114257249A | 2022-03-29 | |||
| CN111880447A | 2020-11-03 | |||
| CN102075194A | 2011-05-25 | |||
| CN105634502A | 2016-06-01 | |||
| CN110932733A | 2020-03-27 | |||
| CN105634503A | 2016-06-01 |
Attorney, Agent or Firm:
BEIJING BEIHUI LAW FIRM (CN)
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