Overview
The LMP91000SDE/NOPB from Texas Instruments is a programmable analog front-end (AFE) configurable potentiostat IC, designed for micro-power electrochemical sensing applications. It provides a complete signal path solution between a sensor and a microcontroller, generating an output voltage proportional to the cell current. This device supports multiple electrochemical sensors, including 3-lead toxic gas sensors and 2-lead galvanic cell sensors, with a single design, eliminating the need for multiple discrete solutions.
Key Specifications
| Parameter | Value |
|---|---|
| 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) | 900 pA (max) |
| Output Drive Current | 750 µA |
| Programmable TIA Gain | 2.75 kΩ to 350 kΩ |
| Ambient Operating Temperature | –40°C to 85°C |
| Package | 14-Pin WSON |
Key Features
- Complete potentiostat circuit for interfacing with most chemical cells
- Programmable cell bias voltage and transimpedance amplifier (TIA) gain via I²C interface
- Low-bias voltage drift and high accuracy
- Sink and source capability
- I²C compatible digital interface for sensor diagnostics and configuration
- Integrated temperature sensor accessible through the VOUT pin
- Supported by WEBENCH® Sensor AFE Designer
Applications
The LMP91000SDE/NOPB is ideal for various electrochemical sensing applications, including:
- Toxic gas detection using 3-lead sensors
- Galvanic cell sensing using 2-lead sensors
- Environmental monitoring
- Industrial process control
- Medical diagnostics
Q & A
- What is the supply voltage range of the LMP91000SDE/NOPB?
The supply voltage range is 2.7 V to 5.25 V.
- What is the average supply current of the LMP91000SDE/NOPB?
The average supply current is less than 10 µA.
- What types of sensors does the LMP91000SDE/NOPB support?
The device supports 3-lead toxic gas sensors and 2-lead galvanic cell sensors.
- How is the TIA gain and cell bias voltage programmed?
The TIA gain and cell bias voltage are programmable through the I²C interface.
- What is the operating temperature range of the LMP91000SDE/NOPB?
The operating temperature range is –40°C to 85°C.
- Does the LMP91000SDE/NOPB have an integrated temperature sensor?
Yes, it has an integrated temperature sensor accessible through the VOUT pin.
- What is the package type of the LMP91000SDE/NOPB?
The package type is a 14-Pin WSON.
- Is the LMP91000SDE/NOPB still in production?
No, the LMP91000SDE/NOPB is no longer in production. A drop-in replacement with upgraded functionality is available as LMP91000SDX/NOPB.
- What tool supports the design of the LMP91000SDE/NOPB?
The device is supported by WEBENCH® Sensor AFE Designer.
- What is the maximum output drive current of the LMP91000SDE/NOPB?
The maximum output drive current is 750 µA.
