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Application Scenario: Isolated Digital Signal Transmission
In this application, we will use the PC81716NIP1H to transmit a digital signal from one circuit to another while ensuring electrical isolation between them. When sensitive systems or components need to be shielded from noise, interference, or voltage spikes, this is frequently required.
Circuit Connection:
To create an isolated digital signal transmission circuit, follow these steps:
1. Input Side (Transmitter):
- Connect the anode (A) of the PC81716NIP1H's internal LED to a current-limiting resistor (R1). Considering the forward voltage and current parameters of the LED, select the suitable resistor value to limit the LED current.
- Attach the LED's cathode (K) to the transmitter circuit's ground (GND).
- To drive the LED, connect the opposite end of the current-limiting resistor (R1) to the collector (C) of an NPN transistor (T1).
- Connect the base (B) of T1 to your digital signal source (e.g., a microcontroller GPIO pin) through a current-limiting resistor (R2). Ensure that the base resistor (R2) is appropriately chosen to drive the transistor into saturation when the input signal is high.
2. Output Side (Receiver):
- Connect the collector (C) of the phototransistor (located inside the PC81716NIP1H) to the supply voltage (Vcc) of the receiver circuit.
- Connect the emitter (E) of the phototransistor to the ground (GND) of the receiver circuit.
- Connect a pull-up resistor (R3) between the collector (C) of the phototransistor and Vcc. The value of R3 should be chosen to ensure proper voltage level shifting and noise immunity.
- The output signal (OUT) is taken from the junction between the collector (C) of the phototransistor and the pull-up resistor (R3).
3. Considerations:
- Ensure that the forward voltage and current requirements of the PC81716NIP1H's internal LED are met to achieve proper operation.
- Select appropriate resistor values (R1, R2, and R3) based on the LED and transistor specifications, as well as your input and output voltage levels.
- Take into account the response time of the optocoupler when dealing with high-frequency signals. The PC81716NIP1H is designed for high-speed applications, but be aware of any limitations in your specific scenario.
- Maintain appropriate safety measures when working with isolated circuits to prevent electrical hazards.
In summary, the PC81716NIP1H optocoupler can be used to create an isolated digital signal transmission circuit, ensuring electrical separation between the input and output sides. Proper resistor values, voltage levels, and response times should be considered during the design process to achieve reliable signal transmission and isolation.
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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
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