Digilent Atlys Manual de referencia - Página 7

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Atlys Reference Manual

Power Supplies

The Atlys board requires an external 5VDC, 4A+ power source with a coax center-positive 2.1mm
internal-diameter plug (a suitable supply is provided as a part of the Atlys kit). Voltage regulator
circuits from Linear Technology create the required 3.3V, 2.5V, 1.8V, 1.0V, and 0.9V supplies from
the main 5V supply. The table below provides additional information (typical currents depend strongly
on FGPA configuration and the values provided are typical of medium size/speed designs).
Supply
3.3V
FPGA I/O, Video, USB ports, Clocks, ROM, Audio
2.5V
FPGA Aux, VHDC, Ethernet PHY I/O, GPIO
1.2V
FPGA Core, Ethernet PHY core
1.8V
DDR & FPGA DDR I/O
0.9V
DDR Termination Voltage (V
The four main voltage rails on the Atlys board use Linear Technology LTC2481 Delta-Sigma 16-bit
ADC's to continuously measure supply current. Accurate to within 1%, these measured values can be
viewed on a PC using the power meter that is a part of the Adept software.
OFF
Power
Switch
ON
Power
Jack
Battery
Connector
J11
Power Select
Jumper JP13
Doc: 502-178
Atlys Power Supplies
Circuits
)
TT
To Digilent
Adept USB
LT3501
3A Regulator
EN
LTC3546
1A Regulator
EN
VU
LT3501
3A Regulator
EN
LTC3546
3A Regulator
EN
Load Switch
EN
Power On
LED (LD15)
Device
IC16: LT3501
IC15: LTC3546 1A / 400mA
IC15: LTC3546 3A / 0.8 – 1.8A
IC16: LT3501
IC14: LTC3413 3A / 900mA
I2C Bus
.01
PG
LTC2481
IC16
.01
PG
LTC2481
IC15
.01
PG
LTC2481
IC16
.01
PG
LTC2481
IC15
Vswt
LTC3413
DDR Term. Reg.
IC17
Amps (max/typ)
3A / 900mA
3A / 0.5 -- 1.2A
3.3V
2.5V
1.8V
1.2V
0.9V
IC14
To Expansion
Connectors,
HDMI, USB
page 7 of 19