This refers to the power required for the output detector circuit (the photodiode and the amplifier). The HCPL-1458 is known for its wide supply range, making it highly versatile for systems running on both standard 5V logic and higher voltage rails. 3. Output Logic Levels ( VOLcap V sub cap O cap L end-sub VOHcap V sub cap O cap H end-sub VOLcap V sub cap O cap L end-sub
Industrial surroundings generate severe electromagnetic interference (EMI) and fast-switching voltage transients ( 1458 optocoupler datasheet
+24V Sensor Signal | [R_in] | +---+ (Pin 1) |-->| Input LED +---+ (Pin 2) | GND (24V System Ground) --------------------------------------- [Isolation Barrier] V_CC (+5V MCU Power) | [R_pullup] | +-----> To MCU GPIO Pin | +---+ (Pin 6) | / | Phototransistor |< | +---+ (Pin 5) | GND (MCU System Ground) Input Resistor ( Rincap R sub i n end-sub ): To target a safe driving current of from a 24V source: This refers to the power required for the
CTR is not linear across all current ranges. It typically peaks between 10 mA and 20 mA of forward current and drops off significantly below 1 mA. Application Circuit Design 1. Digital Logic Isolation (Microcontroller Interface) Output Logic Levels ( VOLcap V sub cap
The HCPL-1458 generally follows the standard high-speed optocoupler pinout: Description No internal connection 2 Input LED anode 3 Input LED cathode 4 No internal connection 5 6 VOcap V sub cap O Output voltage (Open collector) 7 No internal connection (or sometimes VEcap V sub cap E 8 VCCcap V sub cap C cap C end-sub Positive supply voltage Typical Applications
Features a Silicon NPN Phototransistor. When the infrared light strikes the base-collector junction of this phototransistor, it generates a current, allowing electrical conduction across the output terminals.
Because of its high dielectric isolation voltage (up to 5300 VRMScap V sub cap R cap M cap S end-sub ), the 1458 optocoupler is highly versatile.