UM-B-114
DA14531 Development Kit Pro Hardware User Manual
User Manual
Revision 1.4
23-Apr-2020
80 of 82
© 2021 Dialog Semiconductor
Load like SPI flash should be isolated from VBAT_HIGH in order to avoid overloading the rail during
boot. A dedicated GPIO pin can be used to provide power to an external flash memory either directly,
if the current requirements are within the current sourcing capabilities of the pin, or through a load
switch/power management IC. A secondary bootloader is necessary in order to support the powering
up of the external flash. In Figure 77 possible implementations are given.
Figure 77: Examples of SPI Flash power management using (top) analog switch (bottom)
directly GPIO
For more information regarding the boost operation and flash and secondary bootloader refer to [3]
and [4].
