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1. (WO2017152019) CORE INDEPENDENT PERIPHERAL BASED ULTRASONIC PROXIMITY SENSING PERIPHERAL

Pub. No.:    WO/2017/152019    International Application No.:    PCT/US2017/020603
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sat Mar 04 00:59:59 CET 2017
IPC: G01S 7/523
G01S 15/10
Applicants: MICROCHIP TECHNOLOGY INCORPORATED
Inventors: CURTIS, Keith E.
SUMAGUE, Kristine Angelica
STRAM, Anthony
Title: CORE INDEPENDENT PERIPHERAL BASED ULTRASONIC PROXIMITY SENSING PERIPHERAL
Abstract:
A proximity sensing function is implemented using a collection of core independent peripherals (CIPs) in a microcontroller without software overhead to the central processor during operation thereof. A pulse width modulation (PWM) peripheral generates a high frequency drive signal that is on for a short duration to an ultrasonic transmitting transducer. An ultrasonic receiving transducer receives reflected ultrasonic pulses during an integration time window. The received pulses are detected and integrated into a voltage value. The integrated voltage value is compared to a prior voltage value average, and if different, generates a proximity sense signal of an object. Direction, distance and speed of the object may also be determined from the voltage values.