LMP91002 Series
Configurable AFE for Low Power H2S and CO Sensing Applications
Manufacturer: Texas Instruments
Catalog
Configurable AFE for Low Power H2S and CO Sensing Applications
Key Features
• Typical Values, TA= 25°CSupply Voltage 2.7 V to 3.6 VSupply Current (Average Over Time) < 10 µACell Conditioning Current Up to 10 mAReference Electrode Bias Current (85°C) 900-pA(Maximum)Output Drive Current 750 µAComplete Potentiostat Circuit to Interface to MostNot Biased Gas SensorsLow Bias Voltage DriftProgrammable TIA Gain 2.75 kΩ to 350 kΩI2C-Compatible Digital InterfaceAmbient Operating Temperature –40°C to 85°CPackage 14-pin WSONSupported by Webench Sensor AFE DesignerTypical Values, TA= 25°CSupply Voltage 2.7 V to 3.6 VSupply Current (Average Over Time) < 10 µACell Conditioning Current Up to 10 mAReference Electrode Bias Current (85°C) 900-pA(Maximum)Output Drive Current 750 µAComplete Potentiostat Circuit to Interface to MostNot Biased Gas SensorsLow Bias Voltage DriftProgrammable TIA Gain 2.75 kΩ to 350 kΩI2C-Compatible Digital InterfaceAmbient Operating Temperature –40°C to 85°CPackage 14-pin WSONSupported by Webench Sensor AFE Designer
Description
AI
The LMP91002 device is a programmable Analog Front End (AFE) for use in micro-power electrochemical-sensing applications. It provides a complete signal path solution between a not biased gas sensor and a microcontroller generating an output voltage proportional to the cell current.
The LMP91002’s programmability enables it support not biased electro-chemical gas sensor with a single design. The LMP91002 supports gas sensitivities over a range of 0.5 nA/ppm to 9500 nA/ppm. It also allows for an easy conversion of current ranges from 5 µA to 750 µA full scale. The LMP91002’s transimpedance amplifier (TIA) gain is programmable through the I2C interface. The I2C interface can also be used for sensor diagnostics. The LMP91002 is optimized for micro-power applications and operates over a voltage range of 2.7 V to 3.6 V. The total current consumption can be less than 10 µA. Further power savings are possible by switching off the TIA amplifier and shorting the reference electrode to the working electrode with an internal switch.
The LMP91002 device is a programmable Analog Front End (AFE) for use in micro-power electrochemical-sensing applications. It provides a complete signal path solution between a not biased gas sensor and a microcontroller generating an output voltage proportional to the cell current.
The LMP91002’s programmability enables it support not biased electro-chemical gas sensor with a single design. The LMP91002 supports gas sensitivities over a range of 0.5 nA/ppm to 9500 nA/ppm. It also allows for an easy conversion of current ranges from 5 µA to 750 µA full scale. The LMP91002’s transimpedance amplifier (TIA) gain is programmable through the I2C interface. The I2C interface can also be used for sensor diagnostics. The LMP91002 is optimized for micro-power applications and operates over a voltage range of 2.7 V to 3.6 V. The total current consumption can be less than 10 µA. Further power savings are possible by switching off the TIA amplifier and shorting the reference electrode to the working electrode with an internal switch.
