iC-NX 8-CHANNEL LIGHT-GRID PULSE DRIVER
●DESCRIPTION
■iC-NX is an eight-fold LED pulse driver for light curtain systems and light barriers.
■The device,which is controlled by a shift register,features an adjustable LED current sink with a set range of 0.4 to 1.8 A(at room temperature).The three stages of the shift register cell enable data to be safely transported,free of race conditions,in order to activate the pulse driver connected in a chain in a light curtain application.
■The positive temperature coefficient of the LED current sink largely compensates for the decrease in LED efficiency with a rise in temperature.Active discharge provided by short-circuiting the junction capacitance of the LED enables steep light pulses to be generated.The duration of this short circuit is determined by a monoflop which keeps the discharge path of the LED at a low impedance.In the event of light pulses occurring in rapid succession the monoflop is automatically reset to prevent cross currents.
■The current sink common to all eight channels prepares for a light pulse when DIN and subsequently one of the internal data inputs DIi(i=1...8)reads a high signal(NENABLE=lo).With the rising edge of CLK the first flip-flop in the active channel takes on the value of DIi and switches the current sink to out-put LEDi.The LED current sink is disconnected from the LEDi output with the rising edge of the next clock pulse.The duration of the LED current pulse is thus determined by the time difference between two rising CLK edges and should be no less than 0.5μs.
■The next channel in the chain is activated when at the falling edge of the second clock pulse the shift register transfers the high to output DOi.This must be enabled by SHEN being high;if this is not the case,a clock-synchronised reset of the entire chain is triggered.
●FEATURES
■1to 8 channels (hardware programmable)
■LED pulse current can be adjusted from 0.4 to 1.8 A via a single external low power resistor
■Positive pulse current temperature coefficient permits compensation of decreases in LED efficiency
■Short light pulses from 0.5 μs with steep edges
■Low standby current; device activated by input data
■Diagnostic message generated with LED interrupts
■LED short-circuit recognition
■Control logic with three-stage shift register
■Output buffer with 120Ω line adaptation
■Supply voltage range of 4.75 to 6 V
■Thermal and low-voltage shutdown
■Integrated protection against ESD
■Configured for safety systems according to IEC 1496-1
■Optional extended temperature range of -20 to 85 °C
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[ Protective equipment ][ ESPE ] |
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/11/18 |
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Rev C1 |
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471 KB |
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