Power supply
Aria G25 needs a single line 3.3 volt DC power supply which can be provided in any combination on the following pins:
| Power lines | Aria pins |
|---|---|
| +3V3 DC power in | N1, S1, E24, W24 |
| GND signal ground | N24, S24, E1, W1 |
A simple and cheap module called PS3V3 is available from Acme SYstems.
It has a miniUSB connector and can
be integrate in your PCB as a SMD component.
Extended range power supply
If you need to get the power in an industrial or mobile environment here is illustrated a simple solution using this two modules:
In this way is is possible to provide to Aria from a 7 to 28 Volt DC source.
Power supervisor
In real life applications we suggest to add a reset supervisor circuit to assure correct startup sequences.
Here are two possibilities:
- Using a TPS3808G33 IC more flexible since it lets you to program the reset assertion delay with C52.
- Using a CAT811 IC that is cheaper but has a fixed 140ms delay.
RTC backup battery
Applying 3 Volt DC on E1 (GND) and E20 (VBAT +3VDC) it is possible to mantaint the RTC (Real Time Clock) active when the power supply if off. This will mantain the system clock up to 6 months with no power using a small CR1220 Lithium battery.
A bigger battery can be used to extend the time duration.
