Dear TI' Engineer,
According to TI's reference, TI recommand TPS62730 to be the power supply of CC254x.
I use TPS62730 to power the CC2541, the TPS62730 output is 2.1V.
I found that when powered with TPS62730, the internal Flash cannot be accessed normaly, as the osal_nv_item_init() returns FAILED.
So I remove TPS62730 and use a TEK Programmable Power to power the CC2541.
I find that:
If VCC=1.9-2.2V, the BLE connection and characteristics read/write are OK. But NV Flash can not be accessed normally.
If VCC=2.3V-3V, the BLE connection and characteristics read/write are OK. And NV Flash can be accessed normally.
So, I think TPS62730 is not suitable for CC2541 if NV Flash access is needed. Am I right?
And besides TPS62733 and TPS62736, is there any other solution to provide ultra low power 2.3V? Because I find that TPS62733 and TPS62736 are a lot more expensive than TPS62730.
Thank you.
Frank