40X2 power question

[wagp]

In the section 1 manual, page 8 it says,

"Outputs:
Each output can sink or source 20mA. This is enough to light an LED but will
not, for instance, drive a motor. Total maximum current per chip is 90mA."

My question:
Does the 90mA per chip limit apply to the 40X2?

 

[eclectic]

See page 427 here:

http://ww1.microchip.com/downloads/en/DeviceDoc/41412F.pdf

It's the 40X2 "base" chip from
http://www.picaxe.com/What-is-PICAXE/PICAXE-Chip-Labels/

e

 

[hippy]

I've updated http://www.picaxeforum.co.uk/showthread.php?11963-PICAXE-I-O-Current-Capability

PICAXE-28X2 / 40X2 ( 18F25K22 / 18F45K22 )

Sourced through chip : 200mA
Sunk through chip : 300mA
Sourced for all ports combined : 185mA
Sunk for all ports combined : 200mA
Sourced or sunk per pin : 25mA

 

[Buzby]

Sunk through chip : 300mA
Sunk for all ports combined : 200mA

Hi hippy,

I don't worry much about currents through my PICAXES, I never drive anything more than an LED.

But those figures confuse me.

Where does the remaining 100mA go ?

Cheers,

Buzby

 

[hippy]

But those figures confuse me.

Not as confusing as those figures which state maximum rating for ports greater than for the chips !

For this case I guess what it's saying is that I/O current through the ports cannot be greater than 200mA or greater than 300mA minus whatever else on-chip peripherals are using.

 

[wagp]

Thanks guys