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1. (WO2013052618) MEASURING CAPACITANCE OF A CAPACITIVE SENSOR WITH A MICROCONTROLLER HAVING DIGITAL OUTPUTS FOR DRIVING A GUARD RING
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2013/052618    International Application No.:    PCT/US2012/058682
Publication Date: 11.04.2013 International Filing Date: 04.10.2012
IPC:
H03K 17/96 (2006.01)
Applicants: MICROCHIP TECHNOLOGY INCORPORATED [US/US]; 2355 West Chandler Blvd. Chandler, AZ 85224-6199 (US)
Inventors: LUNDSTRUM, Zeke; (US).
CURTIS, Keith; (US).
DAVISON, Burke; (US).
STEEDMAN, Sean; (US).
LEFAOU, Yann; (US)
Agent: SLAYDEN, Bruce, W., II.; King & Spalding LLP 401 Congress Ave. Suite 3200 Austin, TX 78701 (US)
Priority Data:
61/544,150 06.10.2011 US
13/633,523 02.10.2012 US
Title (EN) MEASURING CAPACITANCE OF A CAPACITIVE SENSOR WITH A MICROCONTROLLER HAVING DIGITAL OUTPUTS FOR DRIVING A GUARD RING
(FR) MESURE DE LA CAPACITÉ D'UN CAPTEUR CAPACITIF DOTÉ D'UN MICROCONTRÔLEUR AYANT DES SORTIES NUMÉRIQUES POUR COMMANDER UN ANNEAU DE GARDE
Abstract: front page image
(EN)A guard ring (320) is provided around each capacitive sensor plate and charged to substantially the same voltage as a voltage on the capacitive sensor plate. The guard ring reduces parasitic capacitances of the capacitive sensor plate caused by differences in voltage potentials between the capacitive sensor plate, and adjacent circuit conductors, ground planes and power planes. Two digital outputs (724, 728) and associated voltage divider resistors (708, 710) are used to drive the guard ring voltage to substantially the same voltage as the voltage on the capacitive sensor plate.
(FR)Selon l'invention, un anneau de garde (320) se trouve autour de chaque plaque de capteur capacitif et est chargé pour atteindre pratiquement la même tension que la plaque de capteur capacitif. Ledit anneau de garde limite les capacités parasites de la plaque de capteur capacitif provoquées par les différences de potentiels de tension entre la plaque de capteur capacitif et les conducteurs de circuit, les plans de masse et les plans de puissance adjacents. Deux sorties numériques (724, 728) et des résistances de division de tension (708, 710) associées servent à réguler la tension de l'anneau de garde afin qu'elle soit pratiquement égale à celle de la plaque de capteur capacitif.
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)