LMP91000: Control frequency of bias Voltage and read the value to plot it with respect to the current out.

Hi Jain,
Couple of questions and comments for you:
(1) You want to plot Vout vs. bias voltage? For bias you meant CE going into the electrochemical sensor, right?
(2) Do you have a electrochemical sensor connected to the CE-RE-WE terminals? If the sensor is not connected and there is no gas presence to trigger the current change in WE you shouldn't see any change.
(3) Why do you need this data? If you select a gas sensor for your app, all settings should be fixed for proper operation.

TI clarify my comments in (3) you can go to the part product page at www.ti.com/.../LMP91000 and find Webench Designer Tool at the right of the page.
This tool will allow you to select a sensor based on your application (what gas you need to detect) or , if your preferred sensor is not in the list, load the parameters as well using the setting NEW.

All bias conditions and registers settings will be defined for you. I highly recommend to run the tutorial first to become familiar with this design help tool.

Regards,
Jose

Hi Jose

Thank you for your response.

1. I want to plot the Iout vs the sweeping bisa voltage.

2. I have three electrodes dipped in a solution. (Using same concept of potentiostat for cyclic voltametry)

3. I want to plot this data in a graph and analyse its peak current is corresponding to which voltage.

The data should something like 0.6 v - 1mA, 0.5 v - 0.5mA, 0.4v ..... and so on, this is just assumed data i hope you get it.

In addition to my previous post, this is a reference paper which I am following. And want to plot something like figure 4.

0027.08095460.pdf

And what is your question to the forum? Your experiments are clear and you should be able to do it as long as your Arduino SW is right.

Sir

I want to program The BIAS_SIGN register such that it switchs automatically from negative to positive and
from positive to negative in order to obtain a full range CV.

How to do it?