Product details


Features Transimpedance Amplifier Operating temperature range (C) -40 to 85 Vs (Min) (V) 2.7 Vs (Max) (V) 3.6 Rating Catalog open-in-new Find other Signal conditioners

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WSON (NHL) 14 16 mm² 4 x 4 open-in-new Find other Signal conditioners


  • Typical Values, TA = 25°C
  • Supply Voltage 2.7 V to 3.6 V
  • Supply Current (Average Over Time) < 10 µA
  • Cell Conditioning Current Up to 10 mA
  • Reference Electrode Bias Current (85°C) 900-pA
  • Output Drive Current 750 µA
  • Complete Potentiostat Circuit to Interface to Most
    Not Biased Gas Sensors
  • Low Bias Voltage Drift
  • Programmable TIA Gain 2.75 kΩ to 350 kΩ
  • I2C-Compatible Digital Interface
  • Ambient Operating Temperature –40°C to 85°C
  • Package 14-pin WSON
  • Supported by Webench Sensor AFE Designer
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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.

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Technical documentation

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Type Title Date
* Datasheet LMP91002 Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical Sensing Applications datasheet (Rev. B) Oct. 29, 2015
User guides SPIO-4 Precision Signal-Path Controller Board User Guide (Rev. A) May 05, 2018
Technical articles SigCon Architect: The keys to your high-speed design Oct. 27, 2015
Technical articles Make signal conditioning easy with WEBENCH® Interface Designer Jan. 27, 2015
Technical articles Get Connected: Equalization Oct. 15, 2014
Technical articles One part for all: Multi-standard signal conditioners Mar. 07, 2014
Application notes AN-2230 MSP430 Interface to LMP91000 Code Library (Rev. C) May 01, 2013
More literature Sensor Analog Front Ends Brochure Oct. 30, 2012
User guides LMP91000EVM User's Guide (Rev. A) Jun. 22, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The Texas Instruments LMP91000EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMP91000 Sensor Analog Front End for Electrochemical sensor. The LMP91000EVM is part of the Sensor AFE evaluation platform.

The SPIO4 communication board is a data capture board (...)

  • Supports 3-lead electrochemical cells and 2-lead galvanic cell in potentiostat configuration
  • Includes LMP91000 Gas Sensor AFE and ADC161S626 16-bit converter

Software development

SNAC032.ZIP (51 KB)
SNAC007.ZIP (27314 KB)

Design tools & simulation

SNIM001.ZIP (33 KB) - PSpice Model

CAD/CAE symbols

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WSON (NHL) 14 View options

Ordering & quality

Support & training

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