Riverdi STM32 Evaluation Board User Manual Rev. 1.4
© 2021 Riverdi
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Hardware features
Module power supply
Possible to deliver from one of 2 USB ports on Eval Board (“Direct USB” or “STM32 USB”), in accordance
with USB standard (5.0 VDC max.)
Backlight power supply
7.2.1
Internal
For display sizes from 3.5” to 5.0”, the USB port gives enough power to get adequate backlight level.
Such backlight power supply configuration (jumper is in higher position, connects BL to 5V on P4) is
shown in the picture below.
For 7.0” displays, USB minimal power capability needs to be 700mA @ 5V (this is a combined power
of Eval Board, BT817Q board and backlight). Please make sure your USB source has enough current
efficiency. If not, use external 5V power source in the way described in point 6.2.2.
