LMP91000SDX【PDF 1/24 页】SPECIALTY ANALOG CIRCUIT, PDSO14

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LMP91000

September 6, 2011

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 5A to 750A full

scale.

The LMP91000’s adjustable cell bias and transimpedance

amplifier (TIA) gain are programmable through the the I2C in-

terface. The I2C interface can also be used for sensor diag-

nostics. An integrated temperature sensor can be read by the

user through the VOUT pin and used to provide additional

signal correction in the C 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 10

μA. 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.

Features

Typical Values, T

A = 25°C

■ Supply voltage

2.7 V to 5.25 V

■ Supply current (average over time)

<10 A

■ Cell conditioning current up to

10 mA

■ Reference electrode bias current (85°C)

900pA (max)

■ Output drive current

750A

■ Complete potentiostat circuit to interface to most chemical

cells

■ Programmable cell bias voltage

■ Low bias voltage drift

■ Programmable TIA gain

2.75k

to 350k

■ Sink and source capability

■ I2C compatible digital interface

■ Ambient operating temperature

-40°C to 85°C

■ Package

14 pin LLP

■ Supported by Webench Sensor AFE Designer

Applications

■ Chemical species identification

■ Amperometric applications

■ Electrochemical blood glucose meter

Typical Application

30132505

AFE Gas Detector

2011 National Semiconductor Corporation

301325

www.national.com

LMP91000

Sensor

AFE

System:

Configurable

AFE

Potentiostat

for

Low-Power

Chemical

Sensing

Applications

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