E52030B54D

The device provides a high current driver for a transmitter LED and a high impedance I-V conversion for the photo current of the receiver diode. Optimized response of both amplifier and ADC allow short transmitter pulses while keeping high detection efficiency. The amplifier's band pass filter characteristics remove noise from the signal.Transmitter pulses and signal acquisition as well as signal evaluation are controlled by the embedded micro controller allowing the user to take full control over the system performance with the user defined program code running from FLASH memory.The configurable address allows bus operation with up to 255 detectors on each bus.

• Designed for network addressable optical smoke detectors
• 2-wire programmable bus operation with 8V to 50V supply
• Low quiescent current (down to 88 µA)
• Embedded 8-bit micro controller with 4-KB FLASH (µ-code) and 128 Byte RAM
• 28+4 Byte E²PROM for configuration data
• Configurable 500mA LED driver
• Configurable modulation current (240mA)
• Photo current input range (1.5 ... 45) nA
• Input bandpass filter: 0.45 .. 4.5 kHz
• 10 Bit ADC
• Thermistor input
• Programmable Bus interface
• 4 digital general purpose IOs
• JTAG debug and programming interface
• Minimum number of external components