Hello Dear All...
We have CN0359 dev kit and we want to use the hardware as a refference in our design.
Power consumption is important for us , because our design will work with batteries. Actually we want to build portable EC meter with the reference of CN0359 design.
We measure the power consumption of the CN0359 and it was like around 350mA.
When we cancelled the LCD and All amplifiers used in EC measuring.
The power consumption decreased to 130mA which is too much for us.
From there we observed that LCD and EC measuring use around 220 mA.
We want to take some advised from you to reduce the power consumption.
First we need to make same changes in hardware if possible.
Secondly we want to change the CN0359 source code. We are thinking to add some sleep mode codes to source code.
For both of them we kindly wait support from Engineering Zone family...
Any advise guys ?
So you can certainly make some changes to the hardware to help satisfy your lower power requirements.
Before you start making hardware changes, I would start making changes to the software and implement the "sleep mode" code to see where that can get your current consumption down too. The source code can be found on the wiki page. (https://wiki.analog.com/resources/eval/user-guides/circuits-from-the-lab/CN0359#schematic_bill_of_materials_gerber_files_source_code) This is going to tell you what range you can get to without changing the hardware, so you have a better idea of what you could change.
In the hardware itself, I would start looking at removing things like the RS-232 communication chip and the LCD (you already did this). Then have a look at the power converters, there are probably a few newer power devices that can get the power rails needed with better efficiency in our Power by Linear product family.
In general I would recommend leaving the analog signal chain alone if you can, because once you start modifying that, then you are going to start to lose the measurement accuracy and range of the EC meter.
Thank you for advices Brandon ... We will do that.