无线传感器

Hi

I have two hardware related question from my customer relating to his wireless sensor.

He is trying to reduce his BOM to the minimum possible.

His questions are:

We are using rechargeable Litihium based battery, this gives us fully charged voltage of about 4.2V. Current design has level shifters for IO that controls charging on/off and LDO for power input, these are to keep voltages within recommended range. Have you tried qualifying this part for higher voltages, any chance of being able to operate directly with 4.2 or by using simple diode in series etc to reduce voltage.
Have you tried making the design work without 32kHz oscillator. Many other wireless chips can use internal oscillator and calibrate it every cycle with high speed oscillator… Is this possible, and what would be concerns/limitations for doing this. Do you have any references for this?

问候

Martin