I am also thinking to replace my Atmegas with the STM32 controller.
I reviewed your circuit (http://jeelabs.net/attachments/download/2532/pnz-rev3.pdf) and have a few questions:
* what kind of diode do you use for the reset
* why did you change the 5V C2 capacitor from 1uF to 4.7uF and the 3.3V C1 capacitor from 10uF to 22uF?
are this all ceramic capacitors?
* Where did you get the stm32l0 controller from....I couldn´t find it for a regular price.
Thanks a lot in advance!
RE: JNZ Circuit - Added by jcw 25 days ago
- the diode is a Schottky diode, I used a RB751V40T1G, but just about any type should do
- oh, no special reason, I think I just happened to have that laying around - 1.0µF is enough
- the output cap helps with brief RX/TX surges when running off a coin cell, I'll probably be increased even further
- yes, all all ceramic caps
- I buy most components for production use from DigiKey in the US
RE: JNZ Circuit - Added by ulli 24 days ago
- the output cap helps with brief RX/TX surges when running off a coin cell, I'll probably be increased even further --> you mean the 22uF, right?
RE: JNZ Circuit - Added by ulli 23 days ago
One additional questions ;)
Why you are using a TPS78233 as voltage regulator instead of the MCP1703 which would make the node more flexible? Up to 16v...
OK it has a lower Quiescent Current but in case of battery applications I would remove the voltage regulator anyway...
Btw, I am looking forward to your next JNZ web blog!!
RE: JNZ Circuit - Added by jcw 23 days ago
I'd like to be able to use the JNZ with LiPo batteries, and maybe some other unregulated harvesting sources.