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Clearly, beeing battery operated does imply some compromises for the Espruino board itself as the key point is autonomy.
Sandisk specs, in my previous post, specify 2.7v to 3.6v and 100 mA at 25 MHz (200 mA at 50 MHz) which could be compatible with 3 AA rechargeable batteries for instance (3 * 1.2 v) directly connected after the voltage regulator. This could, on a battery operated mode, supply far more than enough mA for an SD card.
This is also compatible with the STM32F1 voltages and Amperes.
So the problem is that, either you slow down the writing speed to the SD card, and then it needs only 100 mA at write time, or, you are lucky to get an SD card that doesn't need so much power: No one reads or writes the spec's mA required for a particular SD card maker/model at least not until you got some failure.
Could this be a software only improvement suggestion?
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asez73
@Gordon
Yes, and the voltage regulator will only handle 150mA (larger Vregs waste way more current). It could be a problem but personally I haven't had troubles with it for SD cards - only WiFi where the chip does draw a lot of power.