BBS:      TELESC.NET.BR
Assunto:  Re: PI PICO W minimum voltage..
De:       The Natural Philosopher
Data:     Thu, 14 May 2026 22:17:20 +0100
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On 14/05/2026 18:08, druck wrote:
> On 13/05/2026 14:06, The Natural Philosopher wrote:
>> On 13/05/2026 12:12, druck wrote:
>>> On 12/05/2026 14:04, The Natural Philosopher wrote:
>>>> I measure at the far end of the chain
>>>
>>> How? Multimeter, USB power measuring dongle, oscilloscope.
>>>
>> Sigh
>>
>> The Pi PICO W has three ADCs on board and one is connected directly
>> to VSYS by a voltage divider. I transmit that data every time the
>> device successfully activates.
> 
> I'm not sure I trust something to measure it's own voltage, when it
> might be experiencing low voltage.
> 
That is probably because you have not understood the first thing about 
how a PI PICO W is constructed.

It has its own onboard buck/boost regulators and the ADC is driven from 
a stabilised 3V line

The rest of the chip runs on a less well regulated 3.3V.

The chip runs down to 1.8V

The ADC is not set up to 'measure its own voltage' but that of the 
incoming voltage TO the chip.


> ---druck

-- 
The lifetime of any political organisation is about three years before 
its been subverted by the people it tried to warn you about.

Anon.


--- PyGate Linux v1.5.14
 * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

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