LMP91000SD NSC [National Semiconductor], LMP91000SD Datasheet

LMP91000SD

Manufacturer Part Number

LMP91000SD

Description

Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical Sensing Applications

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LMP91000SD.pdf (24 pages)

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Sensor AFE System: Configurable AFE Potentiostat for

Low-Power Chemical Sensing Applications

General Description

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 pro-

portional 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 so-

lutions. 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 5µA to 750µA full

scale.

The LMP91000’s adjustable cell bias and transimpedance

amplifier (TIA) gain are programmable through the the I

terface. The I

nostics. 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 2.7V to 5.25V. The total cur-

rent consumption can be less than 10μA. Further power sav-

ings are possible by switching off the TIA amplifier and

shorting the reference electrode to the working electrode with

an internal switch.

Typical Application

C interface can also be used for sensor diag-

301325

AFE Gas Detector

LMP91000

C in-

Features

Typical Values, T

■

Applications

■

Supply voltage

Supply current (average over time)

Cell conditioning current up to

Reference electrode bias current (85°C)

Output drive current

Complete potentiostat circuit to interface to most chemical

cells

Programmable cell bias voltage

Low bias voltage drift

Programmable TIA gain

Sink and source capability

Ambient operating temperature

Package

Supported by Webench Sensor AFE Designer

Chemical species identification

Amperometric applications

Electrochemical blood glucose meter

C compatible digital interface

= 25°C

September 12, 2011

2.75kΩ to 350kΩ

2.7 V to 5.25 V

-40°C to 85°C

www.national.com

900pA (max)

14 pin LLP

30132505

<10 µA

10 mA

750µA

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