LMP91000: I am having issue while configuring O2 3 lead sensor with LMP91000

Jeet Sodagar

Part Number: LMP91000

Tool/software:

I am using LM91000EVM board and using O2 lead-free sensor which has -600mV bias and 100uA output at ambient air. Issue is that my bias is not being set and even after keeping it for an 2-3 Hour it does not respond. I am supplying 3.0V to LMP91000. Below is my settings.

TIA GAIN = 350k Ohm,

RLOAD = 33 Ohm,

Vref = internal source,

Vref divider = 20%,

Bias sign = Negative

is there any other issue with the settings?

Thank you so much in advance

3 months ago

0 Alex Thompson 3 months ago

TI__Expert 8515 points

Hi Jeet,

Are you able to send me what you are programming into each register? Have you set the Mode Control Register (0x12) to be in 3-lead amperometric cell mode?

Could you also please provide the O2 cell datasheet you are using? I want to confirm that the RLOAD is correct, and I can purchase it to try and recreate the issue.

Thanks

-Alex Thompson

0 Jeet Sodagar 3 months ago in reply to Alex Thompson

Prodigy 45 points

Sure,

0 Alex Thompson 3 months ago in reply to Jeet Sodagar

TI__Expert 8515 points

Jeet,

I accepted your friend request. Were you planning for share more information in your reply, or over private message?

Thanks

-Alex Thompson

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LMP91000: I am having issue while configuring O2 3 lead sensor with LMP91000