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Revision: November 06, 2006
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www.digilentinc.com
215 E Main Suite D | Pullman, WA 99163
(509) 334 6306 Voice and Fax
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
Figure 1
Digilent PmodREG1
supply module.
Features include:
• 250mA low dropout linear regulator
• fixed 3.3V output volta ge
• input voltage range of 3.8V-16V
• small form factor (0.80” x 1.20”).
Functional Description
1
2
3
4
5
6
VCC
J1 Connector
IO1
IO2
IO3
IO4
GND
VCC
JP1
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
VU
J3
Voltage
Regulator
GND
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,
Figure 2
Block Diagram
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
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
PmodREG1 for operation from power mains.
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.
1
2
3
4
5
6
J2 Connector
J4
Document Title Digilent Confidential Digilent, Inc.
the regulator output from J1, remove the
shorting block on JP1.
The 2-pin header, J4, can be used to take
power from the PmodREG1 module to power
another device via a two-wire MTE cable.
Many Digilent embedded control boards and
Pmod module boards are equipped with a twopin connector as an optional way to provide
power to the board.
www.digilentinc.com Copyright Digilent, Inc. Page 2
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