Powering a micro SD card from Prop pins?

Comments

• Mike Green Posts: 23,101

  2013-07-22 08:15 edited 2013-07-22 08:15

  The main problem is that peak current for some SD cards can be well over the 40mA that a Propeller I/O pin is capable of. There are ways around this because the peak current is transient and the average current is well below the maximum, but the fixes would be much more complicated than just running the SD card off the Prop's power supply.
• Hugh Posts: 362

  2013-07-22 08:33 edited 2013-07-22 08:33

  Mike Green wrote: »

  The main problem is that peak current for some SD cards can be well over the 40mA that a Propeller I/O pin is capable of. There are ways around this because the peak current is transient and the average current is well below the maximum, but the fixes would be much more complicated than just running the SD card off the Prop's power supply.

  
  That's a 'yes' to hopeless na
• Mike Green Posts: 23,101

  2013-07-22 08:46 edited 2013-07-22 08:46

  There's a big difference between wishful thinking and hopeless na
• prof_braino Posts: 4,313

  2013-07-22 10:37 edited 2013-07-22 10:37

  So you really need tp use the prop pin to supply power. or just control power?
  
  For example, use a transistor controled by a prop pin to switch poweroff?
• Duane Degn Posts: 10,588

  2013-07-22 15:26 edited 2013-07-22 15:26

  Cluso99 recently posted a thread about using Prop pins for power. His warning about adding medium to large capacitor probably saved me from killing yet another Prop.