Driver or library
LMP91000
Configurable AFE potentiostat for low-power electrochemical cell monitoring
Data sheet
LMP91000
- Typical Values, TA = 25°C
- Supply Voltage 2.7 V to 5.25 V
- Supply Current (Average Over Time) <10 µA
- Cell Conditioning Current Up to 10 mA
- Reference Electrode Bias Current (85°C) 900pA (max)
- Output Drive Current 750 µA
- Complete Potentiostat Circuit-to-Interface to Most
Chemical Cells - Programmable Cell Bias Voltage
- Low-Bias Voltage Drift
- Programmable TIA gain 2.75 kΩ to 350 kΩ
- Sink and Source Capability
- I2C Compatible Digital Interface
- Ambient Operating Temperature –40°C to 85°C
- Package 14-Pin WSON
- Supported by WEBENCH® Sensor AFE Designer
The LMP91000 is a programmable analog front-end (AFE) for use in micro-power electrochemical sensing applications. It provides a complete signal path solution between a sensor and a microcontroller that generates an output voltage proportional to the cell current. The LMP91000’s programmability enables it to support multiple electrochemical sensors such as 3-lead toxic gas sensors and 2-lead galvanic cell sensors with a single design as opposed to the multiple discrete solutions. The LMP91000 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 LMP91000’s adjustable cell bias and transimpedance amplifier (TIA) gain are programmable through the I2C interface. The I2C interface can also be used for sensor diagnostics. An integrated temperature sensor can be read by the user through the VOUT pin and used to provide additional signal correction in the µC or monitored to verify temperature conditions at the sensor.
The LMP91000 is optimized for micro-power applications and operates over a voltage range of 2.7 to 5.25 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.
Technical documentation
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View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LMP91000 Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical-Sensing Applications datasheet (Rev. I) | PDF | HTML | 31 Dec 2014 |
| Technical article | Designing signal chains for portable diagnostics | PDF | HTML | 18 May 2022 | |
| Technical article | What is the IQ of your home or building? Is it indeed smart? | PDF | HTML | 20 Apr 2015 | |
| Application note | AN-2230 MSP430 Interface to LMP91000 Code Library (Rev. C) | 01 May 2013 | ||
| More literature | Sensor Analog Front Ends Brochure | 30 Oct 2012 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LMP91000EVM — LMP91000 evaluation module
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, (...)
User guide: PDF
Support software
LMP9XXXXSENSORDEV-SW — LMP91000 Sensor AFE Software Download
National's configurable Sensor AFE ICs and WEBENCH® Sensor AFE Designer are part of an integrated hardware and software development platform to simplify sensor system design by enabling the engineer to select a sensor, design and configure the solution, and download configuration in minutes. (...)
Supported products & hardware
Products
Signal conditioners
Precision ADCs
Simulation model
LMP91000 PSpice Model For Configurable AFE Potentiostat
SNAM258.ZIP (34 KB) - PSpice Model
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WSON (NHL) | 14 | Ultra Librarian |
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