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Optical Rotary Encoder
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MuchMore:
Hey

I was planing on using some Bourns EM14 encoder. However they are using 5V on VCC and my µC is on 3.3V. So I was wondering if the output signals are open collector type, than I can just pull them up to 3.3V and have no problems. But if they are internally pulled to 5V I will have to level shift.
Has someone used them before?

Thanks
Ian.M:
RTFM!  Hint: see datasheet spec VO(HI)
langwadt:

--- Quote from: MuchMore on August 20, 2019, 11:15:29 pm ---Hey

I was planing on using some Bourns EM14 encoder. However they are using 5V on VCC and my µC is on 3.3V. So I was wondering if the output signals are open collector type, than I can just pull them up to 3.3V and have no problems. But if they are internally pulled to 5V I will have to level shift.
Has someone used them before?

Thanks

--- End quote ---

doesn't look like open collector, put series resistor or voltage divider on the output
SiliconWizard:
This encoder does not just contain passive switches, it requires a 5+/-0.25V power supply to operate (see datasheet). It contains a LED/photodiode or phototransistor and a small ASIC.
mark03:
The requirement for 5V on [virtually?] all optical encoders is one of those marketplace mysteries which defies explanation.  There's nothing inside the package that needs 5V, and it makes interfacing with most modern systems slightly annoying.  Presumably, manufacturers are using 5V because all of their peers are too.  (This is possibly related to the "we don't implement feature X because there's no demand for it" fallacy, with the 'evidence' being that no one else offers feature X either :palm:)
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