Fully programmable smoke detector IC with integrated bus interface
The E520.32 combines a configurable 200 mA driver for the transmitter LED, a high impedance input for the voltage conversion to the receiver diode and a 2-wire bus interface. It is equipped with 4 KByte of flash ROM and 32 Byte of EEPROM. In addition to a wide photo input current range of 1.5nA to 45nA, the device also features a low current consumption of only 88 µA.
The fast responses of the amplifier and the 10-bit A/D converter allow short transmitter pulses at a high detection rate. Furthermore, due to the narrow band pass filter characteristics of the amplifier, interference signals and false alarms are avoided. The transmitter pulses are processed by the integrated 8-bit microcontroller. The numerous configuration options allow an optimization of the system’s performance. For example, up to 255 detectors can be connected to the bus interface. The chip is designed for an operating temperature range from ‑55 to +85°C and is provided in a SOIC14 package.
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