AD5941
Recommended for New Designs
The AD5940 and AD5941 are high precision, low power analog front ends (AFEs) designed for portable applications that require high precision, electrochemical...
Datasheet
AD5941 on Analog.com
ADUCM355
Recommended for New Designs
The ADuCM355 is an on-chip system that controls and measures electrochemical sensors and biosensors. The ADuCM355 is an ultralow power, mixed-signal microcontroller...
Datasheet
ADUCM355 on Analog.com
AD5940
Recommended for New Designs
The AD5940 and AD5941 are high precision, low power analog front ends (AFEs) designed for portable applications that require high precision, electrochemical...
Datasheet
AD5940 on Analog.com
Hello,
I had the following question.
In the Application Examples of AD5940/41 Git you can find a Basic Application Example for Amperometry, Cyclic Amperometry, Voltammetry and Cyclic Voltammetry.
But I couldn't find an Application Example for Potentiometry or/and Open Circuit Potential.
Is there any of the application examples of AD5940/41 or ADUCM355 which could be taken as a basis for a Pententiometric Measurement Application or/and an Open Circuit Potential measurement ?
The only thread which goes into the direction of this topic is this one:
https://ez.analog.com/data_converters/precision_adcs/f/q-a/542089/ad5940-open-circuit-potentiometry
But I dont fully get it.
Can anyone provide a guidance which one of the application examples would the best one to start to implement a Potentiometric or/and Open Circuit measurement ?
Many Greetings
Hello Akila, sorry for my late reply, i had to do a bit of own research first to precise my question.
I found this thread https://ez.analog.com/data_converters/precision_adcs/f/q-a/116440/voltage-measurement-ocp-open-circuit-potential-using-the-ad5940-resp-aducm355/483997 which already gives good information how to do Potentiometric Measurement, but there is still some questions.
I want to implement the second method, mentioned in this thread:
1) Measure voltage of SE0 w.r.t. VERO0, (AD5940_ADCMuxCfgS (ADCMUXP_VSE0 ,ADCMUXN_VZERO0);)
2)Measure voltage of RE0 w.r.t. VZERO0, (AD5940_ADCMuxCfgS (ADCMUXP_VRE0 ,ADCMUXN_VZERO0);)
3) Subtract (1) from (2).
This is my problem :
In general if you want to configure a measurement with AD5940, three different kind of switch-configurations have to be done.
1) The two inputs of ADC from the ADC switch matrix which are already clear (ADCMUXP_VSE0, ADCMUXP_VRE0 and ADCMUXN_VZERO0)
2) The 15 switches of the Potentiostat circuit (in the code they adressed with SW(0) to SW(15)
3) The four switches of the Low Power DAC (in the code they adressed with "LPDACSW_VBIAS2LPPA | LPDACSW_VBIAS2PIN | LPDACSW_VZERO2LPTIA | LPDACSW_VZERO2PIN")
In the user Manual of AD5940 on page 38 (Figure 23), there is a picture where all this switches can be seen in.
The user manual and the code examples give good explanation on which switches to close for amperometric and voltametric measurement but not for Potentiometry.
Could you please give some clarification how to configure the switches mentioned in 2) and 3) for Potentiometric Measurements in reference to the Picture on Page 38 (Figure 23) of user manual ?
Thx in Advance
Laura
Hello Akila, sorry for my late reply, i had to do a bit of own research first to precise my question.
I found this thread https://ez.analog.com/data_converters/precision_adcs/f/q-a/116440/voltage-measurement-ocp-open-circuit-potential-using-the-ad5940-resp-aducm355/483997 which already gives good information how to do Potentiometric Measurement, but there is still some questions.
I want to implement the second method, mentioned in this thread:
1) Measure voltage of SE0 w.r.t. VERO0, (AD5940_ADCMuxCfgS (ADCMUXP_VSE0 ,ADCMUXN_VZERO0);)
2)Measure voltage of RE0 w.r.t. VZERO0, (AD5940_ADCMuxCfgS (ADCMUXP_VRE0 ,ADCMUXN_VZERO0);)
3) Subtract (1) from (2).
This is my problem :
In general if you want to configure a measurement with AD5940, three different kind of switch-configurations have to be done.
1) The two inputs of ADC from the ADC switch matrix which are already clear (ADCMUXP_VSE0, ADCMUXP_VRE0 and ADCMUXN_VZERO0)
2) The 15 switches of the Potentiostat circuit (in the code they adressed with SW(0) to SW(15)
3) The four switches of the Low Power DAC (in the code they adressed with "LPDACSW_VBIAS2LPPA | LPDACSW_VBIAS2PIN | LPDACSW_VZERO2LPTIA | LPDACSW_VZERO2PIN")
In the user Manual of AD5940 on page 38 (Figure 23), there is a picture where all this switches can be seen in.
The user manual and the code examples give good explanation on which switches to close for amperometric and voltametric measurement but not for Potentiometry.
Could you please give some clarification how to configure the switches mentioned in 2) and 3) for Potentiometric Measurements in reference to the Picture on Page 38 (Figure 23) of user manual ?
Thx in Advance
Laura
