LMP91000SD/NOPB - Configurable AFE Potentiostat for Chemical Sensing | TI
Référence : LMP91000SD/NOPB ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.06 | $306,00 |
| 500 | $2.74 | $1 370,00 |
| 1 000 | $2.5 | $2 500,00 |
LMP91000SD/NOPB Présentation
An analog front-end (AFE) for electrochemical sensors is a mixed-signal IC that combines a potentiostat (a controlled-voltage/current bias circuit for the sensor working electrode), a transimpedance amplifier (TIA) that converts the sensor's picoampere-level current into a usable voltage, and a digital interface for microcontroller configuration. The LMP91000 sits inside the broader sensor signal chain hierarchy: electrochemical sensor -> AFE/potentiostat -> ADC -> microcontroller. Its programmability enables it to support multiple electrochemical sensors including 3-lead toxic gas sensors and 2-lead galvanic cells.
Key features of the LMP91000SD/NOPB include a fully programmable transimpedance amplifier (TIA) gain, programmable bias voltage for the working electrode, programmable load resistor for the reference electrode, and an integrated temperature sensor to compensate for sensor temperature drift. The device also integrates a configurable I2C-compatible serial interface. Its low quiescent current makes it suitable for battery-powered portable gas detectors, and its small 4 mm x 4 mm WSON-14 footprint enables dense PCB layouts in wearable multi-gas sensor modules.
Technically, the LMP91000 implements a true potentiostat topology using an op-amp-based control loop with MOSFET output stages, allowing the working electrode potential to be held precisely at the programmed bias voltage while sourcing or sinking the cell current. The integrated 8-bit DAC sets the bias voltage in 1 mV-typical steps, and the TIA gain is programmed through internal feedback resistor selection, giving the designer flexibility to match sensors with different current ranges (nA-level toxic gas sensors to mA-level bio-sensors).
Typical applications include portable toxic gas detectors (CO, H2S, NO2), industrial safety monitors, breath analyzers, blood glucose meters, and environmental air-quality monitors. In a portable gas detector, the LMP91000 is placed between the 3-lead electrochemical sensor and a low-power MCU with an integrated ADC; the AFE handles biasing and current-to-voltage conversion while the MCU samples the voltage and applies temperature compensation.
When designing with the LMP91000, ensure that the VDD decoupling capacitors are placed as close as possible to the analog and digital supply pins, and that the working, counter, and reference electrode traces are guarded to prevent leakage. The I2C SDA/SCL lines require pull-up resistors to VDD; consult the manufacturer's datasheet for the recommended pull-up value based on bus capacitance and clock speed. This page synthesizes distributor pricing, drop-in alternatives, and design notes not aggregated in any one manufacturer data sheet.
Alternatives de remplacement direct pour LMP91000SD/NOPB — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LMP91000SDE/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LMP91000SDX/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LMP91000SD/NOPB Valeurs maximales et caractéristiques électriques
| Product Type | Programmable Analog Front-End (AFE) / Potentiostat |
| Number of Channels | 1 |
| Resolution (Interface) | 8-bit register |
| Supply Voltage - Analog | 2.7 V to 5.25 V |
| Supply Voltage - Digital | 2.7 V to 5.25 V |
| Boîtier / Format | 14-WFDFN Exposed Pad (WSON-14, 4 mm x 4 mm) |
| Température de fonctionnement | -40 °C to +85 °C |
| Interface | I2C-compatible serial |
| Sensor Support | 3-lead toxic gas, 2-lead galvanic |
| Programmable TIA Gain | Yes (internal feedback resistor selection) |
| Programmable Bias Voltage | Yes (integrated DAC) |
| Integrated Temperature Sensor | Yes |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (NOPB suffix = Pb-free) |
| Lead Free | Yes (NOPB) |
Configuration des broches de LMP91000SD/NOPB
| Broche 1 | SDA — I2C serial data |
| Broche 2 | SCL — I2C serial clock |
| Broche 3 | ADDR — I2C address select |
| Broche 4 | INT — Interrupt output |
| Broche 5 | GND — Ground |
| Broche 6 | VDD — Analog/digital supply |
| Broche 7 | VOUT — TIA output voltage |
| Broche 8 | RE — Reference electrode |
| Broche 9 | WE — Working electrode |
| Broche 10 | CE — Counter electrode |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | EP — Exposed pad (thermal/ground) |
Applications typiques
LMP91000SD/NOPB convient pour 6 applications: Portable Toxic Gas Detector, Industrial Safety Gas Monitor, Breath Analyzer / Medical Diagnostic, Blood Glucose Meter, Environmental Air Quality Monitor, Wearable Multi-Sensor Patch.
Portable Toxic Gas Detector
The LMP91000SD/NOPB is a near-ideal AFE for portable 3-lead toxic gas detectors (CO, H2S, NO2) because it integrates the potentiostat, transimpedance amplifier, and bias DAC into a 4 mm x 4 mm WSON-14 package. Its 2.7 V to 5.25 V supply range supports direct Li-ion battery operation via a buck regulator, while the programmable TIA gain (selectable via internal feedback resistors) lets the designer match the wide dynamic range of nA-to-uA sensor currents. The integrated I2C interface allows a low-power MCU to configure gain, bias, and load resistor on the fly, enabling a single hardware platform to support multiple gas types. Unlike a discrete potentiostat that requires precision op-amps and a low-leakage PCB layout, the LMP91000SD/NOPB is factory-calibrated and immune to most board-level leakage issues.
Recommandé
Industrial Safety Gas Monitor
In fixed industrial safety gas monitors, the LMP91000SD/NOPB provides a reliable, factory-calibrated potentiostat front-end for continuous toxic-gas monitoring in refineries and chemical plants. Its -40 °C to +85 °C operating temperature range covers the harsh industrial envelope, and the WSON-14 package with exposed pad aids thermal dissipation when the monitor is mounted in an enclosed explosion-proof housing. The integrated temperature sensor enables automatic compensation for sensor sensitivity drift with ambient temperature - critical for maintaining accurate readings in environments with large thermal swings. The I2C interface simplifies wiring back to the safety controller, and the device's proven track record in millions of deployed detectors lowers the certification effort for IECEx/ATEX designs.
Recommandé
Breath Analyzer / Medical Diagnostic
Medical breath analyzers (ethanol, acetone, nitric oxide for asthma monitoring) leverage the LMP91000SD/NOPB's micro-power operation and small footprint. The AFE's programmable bias DAC lets the same PCB support multiple sensor chemistries, reducing SKU proliferation for medical OEMs. Its low quiescent current (sub-50 uA typical in standby) preserves battery life in handheld breath analyzers used by law enforcement and clinical staff. The integrated temperature sensor provides on-chip compensation that simplifies the firmware development compared to using an external thermistor. Combined with a Bluetooth Low Energy MCU, the LMP91000SD/NOPB enables a compact, wireless breath analyzer that streams results to a smartphone app for diagnostics and record-keeping.
Recommandé
Blood Glucose Meter
For disposable and reusable blood glucose meters, the LMP91000SD/NOPB delivers the precision TIA needed to convert the picoampere-level current from enzymatic glucose biosensors into a voltage that the integrated ADC of the host MCU can sample. The programmable gain (from kilo-ohms to mega-ohms) supports the dynamic range across low and high glucose concentrations, while the integrated temperature sensor enables compensation for enzyme kinetics that vary with temperature. The 14-pin WSON package fits inside the cramped PCB of a pen-style meter. Because the LMP91000SD/NOPB is a programmable AFE, OEMs can develop a single meter platform that supports multiple test-strip chemistries by changing firmware rather than hardware.
Recommandé
Environmental Air Quality Monitor
The LMP91000SD/NOPB supports consumer-grade environmental air-quality monitors that detect NO2, O3, and other urban pollutants using electrochemical sensors. Its compact WSON-14 footprint and low-power architecture enable multi-sensor arrays to fit in a wall-mounted smart-home device without active cooling. The AFE's I2C interface allows multiple LMP91000 chips to share a single I2C bus for multi-gas designs, with each AFE addressing a different gas sensor. The factory-calibrated bias voltage reduces BOM cost by eliminating the precision external DAC and low-drift reference that a discrete design would require. Combined with a PM2.5 optical sensor, the LMP91000SD/NOPB enables a complete indoor air-quality monitoring station.
Recommandé
Wearable Multi-Sensor Patch
Wearable biochemical patches (lactate, sweat sodium, glucose monitoring) require an ultra-low-power, miniature AFE that the LMP91000SD/NOPB provides. Its 14-pin WSON package (4 mm x 4 mm) plus low quiescent current suits battery-powered patches worn for days or weeks. The programmable TIA gain enables measurement of the wide range of sensor currents typical in sweat analysis (from nA to uA) without changing the analog signal chain. The on-chip temperature sensor also doubles as a skin-temperature input for the patch's activity compensation, eliminating an external component. Integration with a BLE SoC and a thin-film battery yields a flexible, skin-mounted patch that streams biochemistry data to a phone for health tracking.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LMP91000SD/NOPB — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LMP91000SDE/NOPB | LMP91000SDX/NOPB |
|---|---|---|---|
| Package | 14-WSON (4x4) | 14-WSON (4x4) - same | 14-WSON (4x4) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Number of Channels | 1 | 1 | 1 |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Interface | I2C-compatible | I2C-compatible | I2C-compatible |
| Programmable TIA Gain | Yes | Yes | Yes |
| Packaging Variant | Standard reel | Lead-finish variant | X-reel variant |
Principaux différenciateurs
- Fully integrated potentiostat with programmable TIA and bias DAC (vs Discrete op-amp + DAC + precision resistor potentiostat)
- Factory-calibrated bias voltage eliminates external precision DAC (vs LMP91000SDX/NOPB (same silicon))
- Integrated on-die temperature sensor for sensor compensation (vs External thermistor + MCU compensation)
Notes de conception
The WSON-14 package has an exposed thermal pad (EP) that MUST be soldered to the PCB ground plane for both thermal dissipation and electrical grounding. Per the TI datasheet, the EP should be connected to a large continuous copper pour with multiple thermal vias to the inner ground plane to maintain low-impedance grounding and prevent the device temperature from rising above the operating range in high-current sensor applications.
The working electrode (WE), reference electrode (RE), and counter electrode (CE) traces carry nanoampere-level currents and are susceptible to PCB leakage. Use a guard trace driven by the same potential around the WE trace, and avoid running digital signals (SDA, SCL) parallel to or under the analog electrode traces. Clean the PCB with isopropyl after soldering to remove flux residue that can cause leakage currents in humid environments.
Place 100 nF ceramic decoupling capacitors as close as possible to both VDD and GND pins. For electrochemical sensor applications where the AFE current draw varies with sensor response, add a 10 uF bulk capacitor on VDD to suppress supply rail noise during transient sensor events. The I2C SDA and SCL lines require pull-up resistors (typically 10 kohm to VDD); lower values are needed for higher bus speeds.
Do not exceed the absolute maximum VDD of 6 V; even brief overvoltage transients can damage the analog front-end. When measuring low-concentration analytes (sub-ppm), allow at least 30 minutes of warm-up time for the sensor polarization to stabilize before taking measurements. Failing to enable the internal temperature compensation will introduce 5-10% error across the industrial temperature range.
Informations de conformité
NOPB suffix indicates Pb-free / RoHS compliant per TI part numbering convention. Not AEC-Q100 qualified - the LMP91000SD/NOPB targets commercial/industrial sensor markets, not automotive. Halogen-free status not specified in provided data.
