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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LMP91000 Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical-Sensing Applications datasheet (Rev. I) | PDF | HTML | 2014/12/31 | ||
| 技術文章 | Designing signal chains for portable diagnostics | PDF | HTML | 2022/5/18 | |||
| 技術文章 | What is the IQ of your home or building? Is it indeed smart? | PDF | HTML | 2015/4/20 | |||
| 應用說明 | AN-2230 MSP430 Interface to LMP91000 Code Library (Rev. C) | 2013/5/1 | ||||
| 更多文件說明 | Sensor Analog Front Ends Brochure | 2012/10/30 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
LMP91000EVM — LMP91000 評估模組
德州儀器的 LMP91000EVM 評估模組 (EVM) 協助設計師評估 LMP91000 作為電化學感測器之感測器類比前端的運作與效能。LMP91000EVM 為該感測器 AFE 評估平台的一部分。
SPIO4 通訊板為一款資料擷取板；當 LMP91000 用於感測器 AFE 評估平台 (LMP91000EVM) 時，此通訊板為必要配件，且需另行訂購。
SNAC032 — MSP430 Interface to LMP91000 and LMP91002 Code Library
LMP9XXXXSENSORDEV-SW — LMP91000 Sensor AFE Software Download
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (NHL) | 14 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。