Digilent PLTW S7 Referenzhandbuch - Seite 3

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PLTW S7 Reference Manual

Supply

FPGA user I/O, USB Controller, Flash Memory, Pmod

3.3V

Connector, LEDs, Buttons

1.8V

FPGA, USB Controller

1.0V

FPGA Core and Block RAM

1.1

Power Input Options

It is possible to power the PLTW S7 from either USB or from an external power supply attached to pins 24 and 25

of the DIP headers, labeled "VU" and "GND", respectively. The required characteristics of a power source attached

to either of these two options is outlined in Table 1.1.1.

Connector Type

USB

DIP

When the PLTW S7 is powered by the USB connector, the voltage from the USB device is driven onto the VU pin.

This makes it possible to power an external circuit from the USB host in addition to the PLTW S7. The VU pin is

driven via a schottky diode, so a small voltage drop will occur, but it should be assumed that the voltage present

on VU will be close to 5V.

Warning: When a USB host is attached to the micro USB connector, the VU pin on the DIP headers (pin 24) is

driven to the voltage being provided by the USB host (typically 4.5V-5.5V). To avoid risk of damage, any power

source attached to the VU pin must be disconnected before a USB host is attached. Not taking this precaution

can be particularly dangerous if the power source is a battery.

Other product and company names mentioned may be trademarks of their respective owners.

Figure 1.1. Power supply.

Circuits

Table 1.1. Power rail characteristics.

Connector Label

J3 (Pin 24)

Device

Maximum Current

IC6: LTC3568

1.2A

IC6:LTC3569

0.6A

IC6:LTC3569

0.6A

Min/Rec/Max Voltage

Per USB Specification

4.5/5.0/5.5

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