Hi All,
I am modifying a product ( says Product A ) from USB connectoin to Bluetooth.
It is very simple to do a RS232 replacement.
But the output originally is USB, that is a trouble. I need to use a USB (host?) chip to ouput RS232 signal, and one more level shift for my final Bluetooth UART input.
My Bluetooth is 3V. The product A use USB as power, and I measure the VDD and GND is 5V ( when original Prodcut A operating ).
Does that mean I can only use 5V for product A ( so I need a PWM ? if I use battery 3.0V)
Does it possible to use 3V for Product A.
because I think every chip has its own operation range.
but my co-worker just tell me, 3V seems not enough, why say so ? becaues it is not in USB range?
or he is wrong?
Best regards, Boki.