Application Circuit of Low Noise Op-Amp TC75S67TU for Pulse Sensor Reference Guide
■This reference guide describes the specifications, circuits, circuit patterns, usage, and operation of the pulse sensor using the low-noise operational amplifier TC75S67TU (hereinafter, this sensor). This sensor is useda microcontroller and configured to display the operation control and measurement status on a PC. Please refer when designing pulse sensors using TC75S67TU.
●Introduction
■The pulse sensor described in this reference guide is a reflective pulse sensor using an light sensor SFH7051 manufactured by OSRAM Corporation as a sensor device. The sensor unit, which detects the amount of light reflected in the living body, and the amplifier unit, which amplifies the output signal from the sensor unit, are separate boards. The sensor unit is made of a flexible board for consideration of wearable applications in which the sensor unit is brought into direct contact with the living body.
■The sensor and amplifier are connected by a three-wire cable, and the signal from the sensor is amplified by the amplifier and output to the microcontroller. In the document, the microcontroller is theArduino,and it controlsthe operation of this sensor and display the results on the PC. Since the power supply also uses a 5 V DC voltage supplied from the Arduino,it can be used as a pulse sensor if there is the Arduino and a personal computer in addition to this sensor.
■Components other than Op-amps are also surface-mounted, and the sensor section is 30 mmφ and the amplifier section is 20 mm×20 mm, making the circuit board compact and easy to use.
■Note that the circuit and board pattern prepared in the reference design of the pulse sensor described in this guide are provided with jumpers and lands for unmounted elements in consideration of scalability such as changing the bias voltage of the Op-amp. In circuit diagrams and bill of materials, jumpers are written as 0 Ω, and unmounted elements are written as "Not mounted". Also, the wiring on the circuit diagram is indicated by a dotted line.
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Low Noise Op-Amp 、 light sensor 、 Photo sensor 、 Operational amplifier |
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User's Guide |
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Please see the document for details |
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SOT-353F;SOT-353 |
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English Chinese Chinese and English Japanese |
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2019-12-18 |
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Rev.2 |
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RD159-RGUIDE-02 |
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2 MB |
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