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LMP91002 Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical Sensing Applications
SNIS163B
April 2012 – October 2015
LMP91002
PRODUCTION DATA.
CONTENTS
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LMP91002 Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical Sensing Applications
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
I2C Interface
6.7
Timing Characteristics
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Potentiostat Circuitry
7.3.2
Transimpedance Amplifier
7.3.3
Control Amplifier
7.3.4
Internal Zero
7.3.5
2-Lead Galvanic Cell in Potentiostat Configuration
7.4
Device Functional Modes
7.4.1
Timeout Feature
7.5
Programming
7.5.1
I2C Interface
7.5.2
Write and Read Operation
7.5.3
Connection of More Than One LMP91002 to the I2C Bus
7.6
Register Maps
7.6.1
STATUS Register (Offset = 00h)
7.6.2
LOCK Register (Offset = 01h)
7.6.3
TIACN Register (Offset = 10h)
7.6.4
REFCN Register (Offset = 11h)
7.6.5
MODECN Register (Offset = 12h)
8
Application and Implementation
8.1
Application Information
8.1.1
Gas Sensor Interface
8.1.1.1
3-Lead Amperometric Cell In Potentiostat Configuration
8.1.2
Sensor Test Procedure
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Smart Gas Sensor Analog Front End
8.2.2.2
Smart Gas Sensor AFES on I2C Bus
8.2.3
Application Curves
9
Power Supply Recommendations
9.1
Power Consumption
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Community Resources
11.2
Trademarks
11.3
Electrostatic Discharge Caution
11.4
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
NHL|14
MPDS421
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snis163b_oa
snis163b_pm
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