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Lmp91000 configuration

Jordi Font
Prodigy 20 points

Other Parts Discussed in Thread: LMP91000, LMP91000EVM

Hello,

I want start to learn to use the LMP91000. I'm interested in a wide range of electrochemical cells. Then I've started with a O2 sensor (0 - 30 %) in potentiostat mode because I think it's the simplest. I'm using the LMP91000EVM with 3 V Vcc but I'm going to use 5 V.

I've configurated the LMP91000:

OP_MODE 011: 3-lead amperometric cell

INT_Z 10:67% Vref

BIAS_SIGN 0: Positive

BIAS 0000: 0% Vref

FET_SHORT 0: Disabled

RLOAD 11: 100 Ohm

TIA_GAIN 011: 3.5K

CE and RE shorted.

After waiting a stabilization time the Vout 1,185 V at 20,9 % O2 and 1.980 V at 0,0 % O2.

I have 2 questions:

1: Is there any way to achieve a Vout from 0 V (30 % O2) to 5 V (0 % O2) ?

2: When I remove the power supply and put it again I have to wait a stabilization time, because I believe the RLoad is also removed, then can I do anything for avoid this? Or maybe it's better to use the congfiguration like page 20 of datasheet (2-lead galvanic cell grond refered).

Thank you for the support.

Jordi.