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newRPL: [UPDATED April 27-2017] Firmware for testing available for download
04-12-2016, 01:17 PM
Post: #256
RE: newRPL: [UPDATED Mar-09-16] Firmware for testing available for download
(04-12-2016 10:09 AM)Nigel (UK) Wrote:  
(04-12-2016 08:10 AM)Nigel (UK) Wrote:  Just to confirm my readings (this time with a proper power supply and crocodile clips):
  • Current when power is first applied - 82.4 mA
  • Current when switched off: 4.2 mA
  • Current when switched on from the keyboard: 42.4 mA
  • Current when switched off again from the keyboard - 6.8 mA
Subsequent currents are all close to 42mA (on) and between 5mA and 10mA (off).

Nigel (UK)

One extra piece of information that might give a clue: I've left the calculator turned off for about 2 hours and the current settled at about 4 mA. Removing the SD card causes the current to jump up to 10 mA. Re-inserting the card causes the current to drop back to 4 mA again, even before the card is properly seated. Simply having the card mostly in without pushing causes the current to drop.

Nigel (UK)

Good info, thanks. I'll look into the SD card pins.
However, I haven't changed batteries in several weeks, and 4mA with 800 mAh rechargeable batteries should last 200 hrs, or 8 days and change. Add normal daily usage at work and I should've been replacing batteries every week or more often.
That tells me my unit doesn't leak current like yours, but I have no idea why. Han reported big power consumption too, I'd like to hear if he still has that problem.
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RE: newRPL: [UPDATED Mar-09-16] Firmware for testing available for download - Claudio L. - 04-12-2016 01:17 PM

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