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LMP91000 Datasheet

Sensor AFE System

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LMP91000
September 12, 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 5µA to 750µA 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 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.
Features
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
750µA
Complete potentiostat circuit to interface to most chemical
cells
Programmable cell bias voltage
Low bias voltage drift
Programmable TIA gain
2.75kto 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
AFE Gas Detector
© 2011 National Semiconductor Corporation 301325
30132505
www.national.com
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National Semiconductor Electronic Components Datasheet

LMP91000 Datasheet

Sensor AFE System

No Preview Available !

www.DataSheet.co.kr
Ordering Information
Package
14-Pin LLP
Part Number
LMP91000SD
LMP91000SDE
LMP91000SDX
Connection Diagram
Package
Marking
L91000
Transport Media
1k Units Tape and Reel
250 Units Tape and Reel
4.5k Units Tape and Reel
14–Pin LLP
NSC Drawing
SDA14B
Pin Descriptions
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Name
DGND
MENB
SCL
SDA
NC
VDD
AGND
VOUT
C2
C1
VREF
WE
RE
CE
DAP
Top View
30132502
Description
Connect to ground
Module Enable, Active Low
Clock signal for I2C compatible interface
Data for I2C compatible interface
Not Internally Connected
Supply Voltage
Ground
Analog Output
External filter connector (Filter between C1 and C2)
External filter connector (Filter between C1 and C2)
Voltage Reference input
Working Electrode. Output to drive the Working Electrode of the chemical
sensor
Reference Electrode. Input to drive Counter Electrode of the chemical sensor
Counter Electrode. Output to drive Counter Electrode of the chemical sensor
Connect to AGND
www.national.com
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Datasheet pdf - http://www.DataSheet4U.net/


Part Number LMP91000
Description Sensor AFE System
Maker National Semiconductor
PDF Download

LMP91000 Datasheet PDF






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