The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 2017
Filed:
Apr. 27, 2015
Active-semi, Inc., Tortola, VG;
Steven Huynh, Fremont, CA (US);
XuCheng Wang, Guangdong, CN;
Active-Semi, Inc., , VG;
Abstract
An integrated circuit that senses ambient gas concentrations includes a microcontroller, gas sensors, heating resistors and an analog-to-digital converter. A first gas sensor measures a first attribute of a gas concentration, and a second gas sensor measures a second attribute of the gas concentration. The first attribute varies with the gas concentration differently than does the second attribute. The microcontroller controls the duty cycles of signals driven through the heating resistors to adjust the temperatures of the resistors, which are thermally coupled to the gas sensors. A first heating resistor increases the temperature of the first gas sensor to a first target temperature, and a second heating resistor increases the temperature of the second gas sensor to a second target temperature. The analog-to-digital converter converts the attributes measured by the first and second gas sensors into digital values. The microcontroller then uses the digital values to compute the gas concentration.