Overview
The Texas Instruments LMP91000SDX/NOPB is a programmable analog front-end (AFE) designed for micro-power electrochemical sensing applications. This component provides a complete signal path solution between a sensor and a microcontroller, generating an output voltage proportional to the cell current. It is highly versatile, supporting multiple electrochemical sensors such as 3-lead toxic gas sensors and 2-lead galvanic cell sensors with a single design, thereby eliminating the need for multiple discrete solutions.
Key Specifications
| Type | Description |
|---|---|
| Category | Data Acquisition/Analog Front End (AFE) |
| Manufacturer | Texas Instruments |
| Package | WSON-14 (4x4) |
| 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 |
| Operating Temperature Range | -40°C to 85°C |
| Interface | I²C Compatible Digital Interface |
Key Features
- Programmable cell bias voltage and transimpedance amplifier (TIA) gain through I²C interface.
- Supports gas sensitivities over a range of 0.5 nA/ppm to 9500 nA/ppm.
- Easy conversion of current ranges from 5 µA to 750 µA full scale.
- Complete potentiostat circuit for interfacing to most chemical cells.
- Low-bias voltage drift and sink/source capability.
- Integrated temperature sensor for additional signal correction or temperature monitoring.
- Optimized for micro-power applications with total current consumption less than 10 µA.
- Supported by WEBENCH® Sensor AFE Designer).
Applications
The LMP91000SDX/NOPB is designed for various electrochemical sensing applications, including:
- 3-lead toxic gas sensors
- 2-lead galvanic cell sensors
- Other micro-power electrochemical sensing applications where a programmable AFE is required).
Q & A
- What is the primary function of the LMP91000SDX/NOPB?
The LMP91000SDX/NOPB is a programmable analog front-end (AFE) for micro-power electrochemical sensing applications, providing a complete signal path solution between a sensor and a microcontroller).
- What types of sensors does the LMP91000SDX/NOPB support?
The LMP91000SDX/NOPB supports multiple electrochemical sensors, including 3-lead toxic gas sensors and 2-lead galvanic cell sensors).
- What is the supply voltage range for the LMP91000SDX/NOPB?
The supply voltage range is from 2.7 V to 5.25 V).
- What is the operating temperature range for the LMP91000SDX/NOPB?
The operating temperature range is from -40°C to 85°C).
- How is the cell bias voltage and TIA gain programmed?
The cell bias voltage and TIA gain are programmable through the I²C interface).
- What is the maximum output drive current of the LMP91000SDX/NOPB?
The maximum output drive current is 750 µA).
- Does the LMP91000SDX/NOPB have an integrated temperature sensor?
Yes, it has an integrated temperature sensor that can be read through the VOUT pin).
- What is the typical supply current consumption of the LMP91000SDX/NOPB?
The typical supply current consumption is less than 10 µA).
- Is the LMP91000SDX/NOPB supported by any design tools?
Yes, it is supported by WEBENCH® Sensor AFE Designer).
- What package type does the LMP91000SDX/NOPB come in?
The LMP91000SDX/NOPB comes in a WSON-14 (4x4) package).
