Digilent PmodREG1 User Manual
Digilent Hardware
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Revision: November 06, 2006
215 E Main Suite D | Pullman, WA 99163
(509) 334 6306 Voice and Fax
Doc: 502-096
page 1 of 2
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Figure 1
Digilent PmodREG1
Overview
The Digilent PmodREG1 is a small form factor
voltage regulator able to provide up to 250mA
of current at 3.3V. It is specifically designed to
work with the Digilent Pmod modules and
small embedded control boards, such as the
Nanocon, ServoMini, or PmodSF, but is also
useable as a general-purpose voltage power
supply module.
Features include:
• 250mA low dropout linear regulator
• fixed 3.3V output voltage
• input voltage range of 3.8V-16V
• small form factor (0.80” x 1.20”).
Functional Description
The PmodREG1 is intended to provide power
to Digilent Pmod peripheral modules when
they are being used for stand-alone operation
not connected to a Digilent system board, or as
the power supply for small embedded control
modules, such as the Nanocon, that do not
have an integral power supply.
The Digilent Pmod modules use a six-wire
interface made up of four data signals, power,
and ground. The PmodREG1 is designed to
function as a pass-through module that will
pass the four data signals through itself and
provide power on the power and ground pins.
The input voltage to the regulator is connected
via screw terminal connector J3. Any voltage
source between 3.8V and 16V can be
connected here. Observe proper polarity when
connecting the input voltage source to J3.
Digilent has available a coax power jack with
pigtail wires that is suited for connecting a
normal Digilent switching power supply to the
PmodREG1 for operation from power mains.
Alternatively, battery packs, also available from
Digilent, can be attached to provide the input
voltage source.
The output voltage from the regulator will
appear on pin six of connector J2 and on the
VCC pin of the 2-pin header J4. Jumper block
JP1 controls whether the output voltage also
appears on pin six of connector J1. If a
shorting block is installed on JP1, the regulator
output is connected to J1 too. To disconnect
Voltage
Regulator
IO1
J
1
Con
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J
2
Con
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IO2
IO3
IO4
GND
VCC
GND
VU
J3
J4
JP1
VCC
1
2
3
4
5
6
1
2
3
4
5
6
Figure 2
Block Diagram