Datasheet

Functional Description
1 Power Supplies
The Arty S7 board requires a 5 volt power source to operate. This power source can come from
the Digilent USB-JTAG port (J10) or it can be derived from a 7 to 15 Volt DC power supply that’s
connected to the Power Jack (J12) or Pin 8 of Header J7. Header JP13, labeled “5V SELECT”, is
used to determine which source is used.
A power-good LED (LD9), driven by the “power good” (PWRGD) output of the ADP5052 regulator,
indicates that the board is receiving power and that the onboard supplies are functioning as
expected. If this LED does not illuminate when an acceptable power supply is connected and
selected with JP13, please contact your distributor or Digilent Support for further help.
An overview of the Arty S7 power circuit is shown below.
Figure 1.1. Arty S7 Power Circuit.
The USB port can deliver enough power for the vast majority of designs. However, a few
demanding applications, including any that drive multiple peripheral boards, might require more
power than the USB port can provide. Also, some applications may need to run without being
connected to a PC’s USB port. In these instances an external power supply or battery pack can
be used.
An external power supply can be used by plugging into Power Jack J12 and installing a jumper in
the “REG” position on Header JP13. The supply must use a coaxial, center-positive 2.1mm (or
2.5mm) internal-diameter plug, and provide a voltage of 7 to 15 Volts DC. The supply should
provide a minimum current of 1 amp. Ideally, the supply should be capable of providing 36 Watts
of power (12 Volts DC, 3 amps).
An external battery pack can be used by connecting the battery's positive terminal to pin 8 of J7
(labeled VIN) and the negative terminal to pin 7 of J7 (labeled GND), as shown in Figure 1.2. In
order to use the battery pack as the board’s power source a jumper must be installed in the “REG”
position on Header J13. The battery must provide a voltage between 7 and 15 volts DC, and should
NOT be installed while there is a supply connected to Power Jack J12.