Hello,
I am designing a custom board for the DA14580 (QFN48) chip and I want it to be operating in boost mode since I will be providing 1.5V as the VBAT. My question is can the DA14580 be programmed under this mode? I have reviewed multiple documents and still not entirely sure so I decided to ask.
Also, for programming, is the RST pin actually needed for the SWD (JTAG) interface? In the document UM-B-065, page 12, section 5 Programming reference designs using CIB, it shows that the RST pin is needed. However in the schematic of the development kit basic, the RST pin is connected to ground, since the inverter in charge of switching the porlarity of the reset signal coming from the Atmel chip is not mounted. Similarly in the schematic for the wireless keyboard the RST pin is connected directly to GND.
Finally, if the RST signal is not needed, the SWD interface can be as follows?
- VBAT = 1.5v
——SWCKL
- SWDIO
- GND
Thanks,
Hi mjr3vk,
Yes, it can be programmed when the device is operating under boost mode, regarding the RST pin, its good to have it on your board but its not mandatory or required when you program the device via JTAG, it is required only when the programming is done via the UART interface. Yes these are the required connections in order to program the device via JTAG, you can also find this at the FAQs in the Dev kits & Ref Designs section.
Thanks MT_dialog