Dear Guru's,
i am willing to design a data-logger for my project which will connect and log various sensor outputs. I need to connect themrocouple k type, rtd pt100 , 4-20ma current sensor and a 1-10volt output sensor. All these sensors swapable on any channel. And my datalogger will have 12 channels.
I decided to go with psoc 5lp and i am working on it. Internal psoc 5Lp can read and is suffiecient for 4 channels. And my datalogger has 16 channels. Also i want to log data in sd card and usb drive also a modbus RS232 slave / tcp ip slave connection is required. I have completed all the modules . But now i got stuck when it came to pin limitations of psoc5Lp. I already invested in this chip and other sensors. Also time has been invested.
So decided to finish the project by using one last component which will take care of the pin limitation. So i need a helping hand regarding the analog switch / mux which can be cost .
I am lot confused about the analog mux Rds at on and matching as i think it will be difficult if the mv drops due to rds.
I need help to decide which analog switch /mux to be used . I am attaching the basic cirucitary for analog input section.
this is basic design for just four channel. I want to extend this to 16 channel. Is this circuit correct.
i am willing to design a data-logger for my project which will connect and log various sensor outputs. I need to connect themrocouple k type, rtd pt100 , 4-20ma current sensor and a 1-10volt output sensor. All these sensors swapable on any channel. And my datalogger will have 12 channels.
I decided to go with psoc 5lp and i am working on it. Internal psoc 5Lp can read and is suffiecient for 4 channels. And my datalogger has 16 channels. Also i want to log data in sd card and usb drive also a modbus RS232 slave / tcp ip slave connection is required. I have completed all the modules . But now i got stuck when it came to pin limitations of psoc5Lp. I already invested in this chip and other sensors. Also time has been invested.
So decided to finish the project by using one last component which will take care of the pin limitation. So i need a helping hand regarding the analog switch / mux which can be cost .
I am lot confused about the analog mux Rds at on and matching as i think it will be difficult if the mv drops due to rds.
I need help to decide which analog switch /mux to be used . I am attaching the basic cirucitary for analog input section.
this is basic design for just four channel. I want to extend this to 16 channel. Is this circuit correct.
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