TEMPERATURE DETECTING CIRCUIT OF ELECTRONIC TIMEPIECE

• Main Authors: OGUCHI KIKUO, AKAHA MASAO
• Format: Patent
• Language: English
• Published: 17.10.1984
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; ELECTRONIC TIME-PIECES; HOROLOGY; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR; TIME-INTERVAL MEASURING

PURPOSE:To realize a fully integrated temperature detecting circuit by forming two kinds of resistance which generate different temperature signals on the same semiconductor substrate for a temperature detecting circuit which used a thermistor. CONSTITUTION:The temperature detecting circuit is only formed on the same semiconductor substrates monolithically by generating two kinds of different temperature signal. Namely, a switch 101 which uses a P-ch, MOSFET, or PNP bipolar transistor, resistance element 102, resistance elements 103-105 which differ in temperature signal from the resistance element 102, and inverters 106- 108 for temperature detection are arranged properly. A converting circuit 109 which performs temperature conversion from binary logical outputs of the elements 106-108 is also formed on the same semiconductor substrate. The elements 102 and 103-105 are made different in temperature precision only by using resistances which differ in temperature signal such as low-density diffused resistances, high-temperature diffused resistances, and MOS resistances.