Supply
V_BATT
| V_BATT |
| GND |
- Supply voltage: 3.6V - 5.0V (max. 6.0V)
This net powers the gumstix motherboard and all expansion boards. V_BATT is located on all modular connectors.
V_BACKUP_BATT
| V_BACKUP_BATT |
| GND |
- Supply voltage: 3.0V
This net connects to the pin 'VBACKUP' of the power management chip TPS65022.
It exists to source power from an off-board backup battery. V_BACKUP_BATT is located on the 24-pin connector.
If your application needs a backup battery, connect a 3V Li-Ion cell directly to V_BACKUP_BATT and GND and remove R9 (0 Ohm resistor to ground).
Use a boost converter (ex. TPS61070) if you use a single NiMH battery
In systems where no backup battery is used, this net is connected to GROUND.
On the verdex, this is done with R9 (0 Ohm resistor), which is populated by default on our website-sale boards.
SYS_EN
| SYS_EN |
Power Management
Powering Gumstix from batteries
Related pages on the gumstix website:
http://pubs.gumstix.org/documents/Powering_a_Gumstix.pdf
Related pages on the old wiki:
http://docwiki.gumstix.org/index.php/Gumstix_motherboard_I/O#Batteries_and_power
http://docwiki.gumstix.org/index.php/Batteries
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