Smart Machine Smart Decision
SIM521x EVB User Guide
11.04.2011
9
4 Accessory Interface
4.1 Power Interface
Figure 3: Power selection jumper
Table 2: Power supply
Signal
Input/Output
Description
Adapter_VBAT
O
3.8V/2A DC source input
USB_VBAT
O
3.8V/0.5A DC source input
VBAT
I
DC source input
If user wants to use DC adapter as power supply, Adapter_VBAT should be connected to VBAT
on J304 through a jumper as following figure shows.
This board could be powered by USB bus. User should connect the USB pin. USB_VBAT is the
USB power out. If user wants to use USB VBUS to power up the module, please connect
connector VBAT with connector USB_VBAT as following figure shows.and disconnect
Adapter_VBAT.
