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Roseljr
New member
Username: Roseljr
Post Number: 1
Registered: 10-2021
| | Posted on Thursday, October 21, 2021 - 10:05 pm: | 
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Is it possible to add 3.3V to the working voltage of CD4066?
Or add 5V voltage and connect the control terminal to the IO terminal of C8051F060 (3.3V working voltage), can CD4066 be controlled?
Introduction of CD4066:
https://www.utmel.com/components/cd4066-quad-bilateral-switches-ic-equivalent-pinout-and-uses?id=519
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Ke0koy
Junior Member
Username: Ke0koy
Post Number: 41
Registered: 12-2018
| | Posted on Friday, October 22, 2021 - 2:09 pm: |
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The datasheet for the CD4066 states that the device can have a supply voltage between 3-18v and the input voltages for switching operation have a range based on the supply voltage. For supply voltages of 5v, 10v and 15v, the inputs must be, for the low control input state, 1v, 2v, 2v or lower, respectively. For the high input control state, minimum voltages of 3.5v, 7v, and 11v respectively. For example, if the CD4066 is powered from 5v, the input signals must be lower than 2v (low) and higher than 3.5v (high) for the switch to function.
Therefore, a high level signal of 3.3v from the C8051F060 would be too low to switch the 4066, even with the 4066 running off a low supply voltage like 5v.
You will need to add a non-inverting buffer between the output of the C8051F060 and the input of the CD4066 to get that signal level up. Just keep in mind the sink and source current limits of the I/O pins when designing a buffer circuit so you don't fry the MCU. |
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