Bus signal isolation circuit for DS18B20 temperature sensor

• Main Authors: QI YUAN, TIAN HAOXIN, WANG LINLIN, GAO QICHAO, HUANG XINRONG, XIAO WENWEI, LIU HANCHAO, YAN KANGTING, ZHANG YALI, ZHAO DEHUA, LU XIAOYANG
• Format: Patent
• Language: Chinese; English
• Published: 26.03.2021
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; PULSE TECHNIQUE

The invention discloses a bus signal isolation circuit for a DS18B20 temperature sensor. The bus signal isolation circuit comprises a short-circuit protection module, a counter, a clock signal module,an indication circuit and a power supply module, wherein the short-circuit protection module comprises an iic bus signal end, a temperature sensor, an N-channel field effect transistor, an inductor RT6, an inductor RT7, a triode QR1 and a triode QR2; the N-channel field effect transistor is hung between the iic bus and a signal line of the temperature sensor; the gate of the N-channel field effect transistor is connected with a QR1 collector; the QR1 collector is connected with one end of an RT6; the other end of the RT6 is connected with a high level; an emitter of the QR1 is grounded; the base of the QR1 is connected with the counter; a QR2 emitter is connected with a temperature sensor signal line; a QR2 collector is connected with one end of the RT7; and the other end of the RT7 is connected with a high level