Due to shock requirements we cannot use a crystal.
Can the VDD output be used to power a 4.5mA MEMS oscillator?
If the MIC (VIN) is unused should the pin be left floating or tied to some level?
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Due to shock requirements we cannot use a crystal.
Can the VDD output be used to power a 4.5mA MEMS oscillator?
If the MIC (VIN) is unused should the pin be left floating or tied to some level?
Hi,
VDD is an input pin for the digital power supply, not an output.
VIN should be tied to GND with a 0.47uF cap if not being used to prevent noise from coupling into the circuit.
Best regards,
Jeff McPherson
HI,
The data sheet indicates that VDD is an "Internally-generated power supply voltage".
Was hoping to avoid adding an LDO for the oscillator.
Hi,
Sorry, you're right those are all internal supplies generated by Vbus. However I wouldn't use those to supply other devices as they were not designed to be loaded like that. If you want to take advantage of an existing supply, you could probably use VBUS.
Best regards,
Jeff McPherson