@kimot said in Nano minimum voltage:
But it do NOT means with 16Mhz crystal on Arduino Nano ...
Well the AtMega328 has an option to use internal RC oscillation and hence don't need to use the 16MHZ crystal.
yes we agree that with low voltage you must use 1MHz, -> 8MHZ div8
From the link I have provided above, read chap 9.6:
Calibrated Internal RC Oscillator
By default, the Internal RC Oscillator provides an approximate 8.0MHz clock. Though voltage and temperature
dependent, this clock can be very accurately calibrated by the user. See Table 29-9 on page 313 for more
details. The device is shipped with the CKDIV8 Fuse programmed. See ”System Clock Prescaler” on page 45
for more details.
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in Table 9-11. If
selected, it will operate with no external components.
And yes it's possible and maybe needed to calibrate the internal RC, that you need to test
And yes you need also to change fuse for BOD (Brown out detection) as this by default close down the ATMega328 below 2.7V
read chap 10.2: BOD Disable