Embedded Temperature Sensor for Multilevel Current LED Driver

Author

Shih-Chang Hsia ; Ming-Hwa Sheu ; Jhih-Jian Jhou ; Sheng-Yueh Lai

Author_Institution

Dept. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Douliou, Taiwan

Volume

14

Issue

8

fYear

2014

fDate

Aug. 2014

Firstpage

2801

Lastpage

2806

Abstract

In this paper, we propose an embedded temperature sensor for the control of light emitting diode (LED) driving current, providing linear sensing, in which the output of the analog voltage corresponds to the current temperature. Sensing levels are truncated to four regions: 1) 120°C; 2) 140°C; 3) 160°C; and 4) 180°C. Thus, an increase in temperature is met with a corresponding drop in driving current to avoid burning the chip. A test chip was fabricated in using the TSMC 0.25-um CMOS process based on high-voltage mixed signals, in which two-channel LED drivers were embedded with two temperature sensors. The chip proved highly effective in all tests.

Keywords

CMOS integrated circuits; driver circuits; electric current control; intelligent sensors; light emitting diodes; temperature sensors; LED driving current control; TSMC CMOS process; embedded temperature sensor; high-voltage mixed signal; light emitting diode; linear sensing; multilevel current LED driver; size 0.25 mum; temperature 120 degC; temperature 140 degC; temperature 160 degC; temperature 180 degC; test chip fabrication; CMOS integrated circuits; Inverters; Light emitting diodes; Temperature measurement; Temperature sensors; Vehicles; LED driver; TSMC; Temperature sensor;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2014.2316284

Filename

6798660