Hi,
Is it possible to power external devices through VDD ports of NRF52833 provided we follow the VDDH supply configuration?
We are looking to power sensors from the controller. The total current will be less than 10mA.
Thank you,
Chethan
Hi,
Is it possible to power external devices through VDD ports of NRF52833 provided we follow the VDDH supply configuration?
We are looking to power sensors from the controller. The total current will be less than 10mA.
Thank you,
Chethan
External power from the VDD pin is not supported on the nRF52833.
Hi,
Needed one more clarification for the power supply.
Does NRF52833 operate at 3.7V connected to VDD?
We have 3.6V batteries and initially their voltage will be a little high. Can NRF still operate with this slight extra voltage?
Thanks ketiljo.
Can we get the different modes and currents for it?
We are designing a low power product and every uA is crucial.
With the ldo turned on, does it burn complete power across vddh - regout0? Or is there some smart mechanism which avoids this?
You will be better off using the nRF52840 as this have a DCDC mode for REG0 (VDDH). This is a lot better for low current applications. The nRF52833 doesn't have DCDC mode at REG0 so this will just burn off the current as any other LDO.
The nRF52840 can power external circuitry as well.
Only if 52840 could support 105 deg
Ok. The best will be to use an external DCDC converter to take the battery voltage down to 3 V or so as this will be much more efficient than the LDO in the nRF52833.
I didn't expect hat you needed 105 degrees since you where talking about batteries, that won't work too unless the battery is somewhere else?
We are using a variant of lithium thionyl chloride batteries which can support up to 125 deg. Its an industrial iot application with very stringent requirements
We are using a variant of lithium thionyl chloride batteries which can support up to 125 deg. Its an industrial iot application with very stringent requirements
The advice will be to use an external DCDC converter with the nRF52833 then. Or maybe the nRF52820 can fit the bill: https://www.nordicsemi.com/News/2020/03/Nordic-nRF52820-SoC-the-sixth-addition-to-the-nRF52-Series?utm_campaign=SoMe%20promotion&utm_source=facebook&utm_medium=social&utm_content=News%20release:%20nRF52820
We ended up using an external DCDC. Thanks for your help though. Appreciate it. nRF52820 looks interesting but we need a large RAM size as well
Is there any plan of supporting 105 deg with 256kb RAM in the future?
The new nRF53 series possibly, here's the first device: https://infocenter.nordicsemi.com/topic/ps_nrf5340/keyfeatures_html5.html
Hi ketiljo,
Had one more query on the hardware design.
In infocentre, the following is mentioned:
Note: If SPIM0, SPIM1, or SPIM2 is used with 8 Mbps data rate, the recommended GPIOs for the clock signal (SCK) are P0.27, P1.08, P0.04, and P1.09.
Any reason for using this particular lines?
We have been using SPI at 8MHz with P0.17 and seems to be working fine. So wondering why the special note above?
Thank you,
Chethan
It works with other pins as well. These pins where probably looked as the best suited when it comes to not disturbing the radio. As long as you don't use any of the pins that are recommended for low frequency use only, you're fine.