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Looking at the ILI9341 datasheet Electrical Characteristics, I just can't find information about power consumption. The information is also missing from the LCD module datasheet (ER-TFT024-3).
I know that ILI9341 supports sleep modes where power is low, but I can't find data on power consumption under regular conditions.

My intention is to power the LCD (not the backlight!) from MCU pin under the assumption that continuous current will be in the 20mA neighborhood, or even less than that. (I'll drive the backlight by a MOSFET).

  • Is it common to drive low-power peripherals from MCU IO pin? Are there any pitfalls except from the current rating (and voltage) of the IO pin?
  • Does anyone have some experience with ILI9341 or similar module, and can confirm my assumptions about its low power consumption?

Update

When measuring VDDI + VCI with multimeter I observe a flat 8mA...

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  • \$\begingroup\$ The current consumption of the peripheral IC may have positive spikes, which may fry the pin. \$\endgroup\$ – Mike Spark Oct 30 '18 at 22:36
  • \$\begingroup\$ I consider MCU I/O pins as signal outputs, not as power sources - I might use them directly to light an LED, but never to supply power to other devices. \$\endgroup\$ – Peter Bennett Oct 31 '18 at 0:49

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