Powering from 3v3 only

[Paul Bidmead]

I am developing a product to use the OSD3358-512M-BAS and have struck an issue that i need clarification on.

Is it at all possible to power this device with 3v3 only?

this has come up as the board does not have a 5v supply available, from what info i can find it could be powered from the VBAT_IN but that will not trigger a power-on meaning it requires the button being pressed.

This brings me to another part of the question, Is it possible to configure the device to be “always on”?

[Eshtaartha Basu]

Hello Paul,

1. It is NOT possible to power this device with just 3.3V input. As given in section 7.1.3 of the OSD335x datasheet, the device will need a nominal input voltage of 3.7V if VIN_BAT input is used and 5V if VIN_AC or VIN_USB is used.

2. The OSD335x will require a falling edge on PMIC_IN_PB_IN (power button) to power up when powered only on battery (VIN_BAT). Once powered up, it is possible to keep the device always on by continuously supplying power through one of the three power inputs (VIN_AC, VIN_USB or VIN_BAT). The OSD335x has the capability to dynamically switch between VIN_AC, VIN_USB and VIN_BAT based on availability.

[Paul Bidmead]

Excellent thank you for your reply

[Eshtaartha Basu]

You’re welcome. Please let us know if you have any other queries.

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