Microcontroller with 140 plus I/O

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Hi, I am looking for microcontroller PIC by Microchip or Arduino having 140 plus I/O for temperature/humidity monitor. There are solutions with external serial/parallel chips and external multiplexers but it's not so easy to find compact solution for which we don't need to make a big PCB. I appreciate if you have any suggestion in selecting Microcontroller with 130 plus I/O.
 

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The Temp/Humidity sensors, analog or digital ?

Of course there is a 3'rd option, use ESP8266 with each sensor, and do everything
wireless. Although that takes power / sensor and a chip (ESP8266).


Regards, Dana.
 

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go to any distributor, such as digi-key or mouser, etc
search for processors or FPGAs with lots of pins - say 250 or more.
then examine the data sheet for the number of available (non-dedicated) I/O pins

alternatively, use 2 or 3 or 4 ICs that have 70, or 50, or 40 available I/O pins
considering that these processors may only be about 1/2 a centimeter on a side,
together they make a small board

the real size issue is going to be the 140 or so temperature/humidity input pins
and routing them to 1 (or more) ICs.
 

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Hi,

so 140 IO is the only requirement.
No:
* digital / analog
* voltage range / levels
* speed
* communication informations, interface, protocol
* wiring / cable length
* ...

Klaus
 

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Two chips, each with 12 bit ADC 1 Msps, analog mux (75 channels), Vref, COM, and a lot more on each chip.

So 75 channel solution in each chip. ARM core also onchip. PSOC 4200L family.




Regards, Dana.
 
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