描述 Description

The IC E520.24 provides two high current driver for a transmitter LED and a high impedance I-V conversion for the current of the photo 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 processor (μP) allowing the user to take full control over the system performance with the user defined program code running from Instruction Memory. Up to two independent red LED driver can be used to indicate alarm or device status as controlled by the μP. Up to 8 GPIOs can be used to control additional external components. The configurable address allows bus operation with a huge number of detectors on the LN24 bus.

特性 Features

·2-Wire bus operation with 8V to 50V supply, low supply current down to 88μA
·Configurable bus transceiver
·Embedded 8-bit μC with 4kByte Flash-ROM
·Sensitive input for photo diode and programmable LED driver
·Thermistor input for separate temperature surveillance
·4 GPIOs combined with programming interface for factory configuration

應(yīng)用 Application

·Simplifies design of addressable smoke detectors required by legislation
·Fully programmable smoke detectors
·Device with GPIOs and LN24 bus interface
·Alarm Switch Controller