Microchip Technology

The RE46C190 is not recommended for new designs. Please use the RE46C191 for all new designs. The RE46C190 is a low voltage, low current programmable photoelectric smoke detector IC. This circuit will provide all the required features for a photoelectric smoke detector with minimal external components. Programmable setup, calibration and feature selection are the key to reduced component count and reduced manufacturing costs. The boost regulator insures proper operation of the infrared diode and the piezo horn under low battery conditions.

The RE46C194 is a lowpower, low voltage CMOS photoelectric type smoke detector ASIC. With minimalexternal components, this circuit will provide all the required functions and features for aphotoelectric smoke detector. Programmablesetup, calibration and feature selection are the key to reduced component countand reduced manufacturing costs. The low averageoperating current of the RE46C194 allows smoke detectors to achieve 10-yearoperation with lithium ion batteries. Theboost regulator insures proper operation of the infrared diode and the piezoelectrichorn under low battery conditions. The design incorporatesa programmable gain integrating photo amplifier for use with an infrared emitterdiode. The infrared emitter drivecurrent is programmable along with smoke alarm limits which provides thedesigner with exceptional flexibility when designing a smoke detector. Smart IO with CO temporal horn pattern allows the RE46C194 to be used in combined CO and photoelectric smoke detectors.

The RE46C311 operational amplifier (op amp) has a very low input bias current of less than 6 pA at 60 °C with a low typical operating current of 600 nA, an offset voltage that is less than 1 mV and a gain bandwidth product of 10 kHz. The RE46C311 uses advanced CMOS technology, which provides high-speed operation, high open-loop gain, rail-to-rail input and rail-to-rail output swing. The RE46C311 operates with a single supply voltage that can be as low as 1.8V, while drawing less than 1.0 µA of quiescent current per amplifier. The RE46C311 is available in standard 8-lead PDIP and SOIC packages. This amplifier is ideal for high impedance low input bias current sensors such as ionization smoke detectors and pH electrodes, low-power battery-operated devices, and portable equipment.

The RE46C317 is a CMOS Piezoelectric Horn Driver ICs with built-in boost converter. It is intended for use in 3V battery or battery-backed applications. The circuit features a DC-to-DC boost converter and a driver circuit suitable for driving a piezoelectric horn. The RE46C317 is compatible with the RE46C117 and offers lower stand-by current. The RE46C317 provides a tri-state input for Horn Enable.

The RE46C318 is a CMOS Piezoelectric Horn Driver ICs with built-in boost converter. It is intended for use in 3V battery or battery-backed applications. The circuit features a DC-to-DC boost converter and a driver circuit suitable for driving a piezoelectric horn. The RE46C318 is compatible with the RE46C117 and offers lower stand-by current.

The RE46C600 is a low power CMOS ionization smoke detector MCU companion IC. The RE46C600 provides all of the analog, interface, and power regulation functions for a micro controller-based ionization smoke detector. It is intended for use in both 3V battery and AC battery-backed applications. It features a boost converter and horn driver circuit suitable for driving a piezoelectric horn, a 4.0V regulator for micro-controller voltage regulation, an operational amplifier and an interconnect circuit for communication with other smoke detectors units.

The RE46C800 is a low power CMOS carbon monoxide detector companion IC. The RE46C800 provides all of the analog, interface, and power management functions for a microcontroller based CO or toxic gas detector. It is intended for use in both 3V and 9V battery or battery-backed applications. It features a high performance operational amplifier, a 3.3V regulator for microcontroller voltage regulation, a boost converter, horn driver circuit suitable for driving a piezoelectric horn, an LED driver, and an I/O circuit for communication with interconnected units.

The RE46C803 is a low voltage low power CMOS carbon monoxide detector companion IC. The RE46C803 provides all of the analog, interface, and power regulation functions for a microcontroller-based CO or toxic gas detector. The RE46C803 is intended for use in standalone 3V battery applications. It features a boost converter and horn driver circuit suitable for driving a piezoelectric horn, an LED driver, a 3.3V regulator for microcontroller voltage regulation, a 1.8V regulator for the CO op amp supply, and a high performance operational amplifier and reference for CO detection.