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TPS8802: difference between LMP91000

Part Number: TPS8802
Other Parts Discussed in Thread: LMP91000, , TPS8804,

Hi E2E,

There is a CO sensor application. In the smoke & heat detector EERD, I found there are two sensors in subsystem ''Gas detection analog front-end''.

i would like to know the difference between TPS8802EVM and LMP91000. 

Thank you

Best regards,


  • Hi Angela,

    The TPS8802 is designed for smoke alarms. It has the amplifiers and drivers for a photoelectric smoke sensor, 2-terminal carbon monoxide sensor, interconnect interface, piezo horn driver, battery test load. It also has LDO regulators and a boost converter for connection to a 3V or 9V battery, microcontroller, and the internal analog circuitry. The TPS8804 is similar but does not have the battery test, horn driver, interconnect, or boost converter.

    The LMP91000 is an AFE for gas/chemical sensors, including 3-terminal and 2-terminal carbon monoxide sensors. It has programmable reference voltages and amplifier gains. It also has a temperature sensor.

    Both systems are optimized for low power consumption. The TPS8802 has a wider input voltage range and has regulators for connecting to a variety of power sources.

    Both systems support 2-terminal CO sensors. The LMP91000 supports 3-terminal CO sensors. The LMP91000 also has a temperature sensor.

    The TPS8802 is designed for use in smoke alarms with CO sensors, where the LMP91000 is designed for use in gas/chemical detectors.

    If you are looking for an AFE for a CO sensor, LMP91000 is the better choice. If you need an AFE with regulators and a horn driver for a CO detector, TPS8802 is the better choice.

    I hope this answers your question. Feel free to email me with more information on the customer's requirements and I can give you a recommendation for which device would be a better fit.