Configurable analog front-end for mutual capacitance sensing and self capacitance sensing

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United States of America Patent

PATENT NO 9523725
APP PUB NO 20140312919A1
SERIAL NO

14322244

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Abstract

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Capacitance sensing circuits and methods are provided. A dual mode capacitance sensing circuit includes a capacitance-to-voltage converter having an amplifier and an integration capacitance coupled between an output and an inverting input of the amplifier, and a switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitive to voltage converter in a mutual capacitance sensing mode and responsive to self mode control signals for controlling signals supplied from the capacitive touch matrix to the capacitance-to-voltage converter in a self capacitance sensing mode, wherein the capacitance sensing circuit is configurable for operation in the mutual capacitance sensing mode or the self capacitance sensing mode.

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Patent Owner(s)

  • STMICROELECTRONICS ASIA PACIFIC PTE LTD;STMICROELECTRONICS S.R.L.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Angelini, Paolo Bologna, IT 32 953
Guedon, Yannick Singapore, SG 54 391
Guo, Dianbo Singapore, SG 36 657
Lasalandra, Ernesto San Donato Milanese, IT 37 813
Tan, Kien Beng Singapore, SG 49 432
Tripoli, Giovanni Carlo Rho, IT 9 139
Ungaretti, Tommaso Pavia, IT 15 334

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