Note the following details of the code protection feature on Microchip devices:
•Microchip products meet the specification contained in their particular Microchip Data Sheet.
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intended manner and under normal conditions.
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knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•Microchip is willing to work with the customer who is concerned about the integrity of their code.
•Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
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EEPROMs, microperipherals, nonvolatile memory and analog
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INTRODUCTION
This chapter contains general information that will be useful to know before using the
Voltage Supervisor SOT23 Evaluation Board. Items discussed in this chapter include:
• Document Layout
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Web Site
• Customer Support
• Document Revision History
DOCUMENT LAYOUT
This document describes how to use the Voltage Supervisor SOT23 Evaluation Board
as a development tool. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the Voltage
Supervisor SOT23 Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this evaluation board.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the Voltage Supervisor SOT23 Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the Voltage Supervisor SOT23 Evaluation Board.
• Appendix C. “Microchip Analog SOT-23 Device Compatibility” – Explains
how this board (PCB) may be used with other Microchip Analog devices in the
SOT-23-3 package.
Voltage Supervisor SOT23 Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
DescriptionRepresentsExamples
Arial font:
Italic charactersReferenced booksMPLAB® IDE User’s Guide
Emphasized text...is the only compiler...
RECOMMENDED READING
For more information regarding the Voltage Supervisor and Voltage Detector devices,
the specific device data sheet is recommended reading. Table shows the device and
associated Data Sheet literature number. These documents can be downloaded from
the Microchip web site at: www.microchip.com.
Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the web site contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
• Development Systems Information Line
Customers should contact their distributor, representative or field application engineer
for support. Local sales offices are also available to help customers. A listing of sales
offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com
Preface
DOCUMENT REVISION HISTORY
Revision B (July 2006)
• Add disclaimer to Bill of Materials regarding RoHS-Compliant part numbers
• Removed Appendix D and incorporated information here.
This chapter provides an overview of the Voltage Supervisor SOT23 Evaluation Board
and covers the following topics:
• What is the Voltage Supervisor SOT23 Evaluation Board ?
• What the Voltage Supervisor SOT23 Evaluation Board kit includes
1.2WHAT IS THE VOLTAGE SUPERVISOR SOT23 EVALUATION BOARD ?
The Voltage Supervisor SOT23 Evaluation Board allows the system designer to
quickly evaluate the operation of Microchip Technology’s Voltage Supervisors and
Voltage Detectors in the SOT-23-3 (3-pin SOT-23) package.
The Voltage Supervisor SOT23 Evaluation Board PCB supports the four different
SOT-23-3 pinouts for the product family. This board has been made generic so that
other devices may be supported with this board.
1.3WHAT THE VOLTAGE SUPERVISOR SOT23 EVALUATION BOARD KIT
INCLUDES
This Voltage Supervisor SOT23 Evaluation Board Kit includes:
• Five Voltage Supervisor SOT23 Evaluation Board Printed Circuit Boards (PCBs)
• Five MCP112 device samples (MCP112T-270E/TT) that can be installed on the
Voltage Supervisor SOT23 Evaluation Board PCBs
- 2.63V Trip Point (Typical)
- Extended Temperature
- SOT-23-3 Package
• Voltage Supervisor SOT23 Evaluation Board User’s Guide
(Electronic Version on CD)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
The blank Printed Circuit Board (PCB) allows the desired voltage supervisor or voltage
detector device to be installed along with other desired passive components (resistor
and capacitors) and connection posts.
The Voltage Supervisor SOT23 Evaluation Board PCB supports four different
SOT-23-3 pinouts. Three of these pinouts are used by the Voltage Supervisor or
Voltage Detector product family, while the fourth is used by other Microchip analog
products (see Appendix C. “Microchip Analog SOT-23 Device Compatibility”).
This board has been made generic so that other devices may be supported with this
board. However, the silk screen markings are designed for ease-of-use with the voltage
supervisor devices.
2.2FEATURES
The Voltage Supervisor SOT23 Evaluation Board has the following features:
• Connection terminals may be either through-hole or surface-mount
• Four SOT-23-3 pinouts supported
• Optional passive components for:
- Power Supply Filtering
- Output Filtering
- Output Pull-up Resistor
- Output Pull-down Resistor
- Output Loading Resistor
- Output Series Resistor
• Silk screen area to write specifics of implemented circuit , such as MCP111, 2.7V,
10 kΩ (to indicate that the device is the MCP111 with the 2.7V trip point and an
external 10 kΩ pull-up resistor on the output)
Voltage Supervisor SOT23 Evaluation Board User’s Guide
2.3GETTING STARTED
The Voltage Supervisor SOT23 Evaluation Board is a blank PCB that allows the user
to configure the circuit to their exact requirements. The Passive components use the
surface mount 805 package layout. Figure 2-1 shows the board circuit. Table 2-1 shows
which circuit option needs to be used for a given voltage supervisor/voltage detector.
There are currently no voltage supervisors/voltage detectors that use the Option 3
pinout. For other Microchip Analog Devices, please refer to Appendix C. “Microchip
Voltage Supervisor SOT23 Evaluation Board User’s Guide
2.3.1The Hardware
Figure 2-2 shows the layout of the Voltage Supervisor SOT23 Evaluation Board . This
is a small board (1”x1.2” (25.4 mm x 30.5 mm)) that is single-sided. There are three
connection points (V
surface-mount connector posts. Additionally, a test point is available on the device
V
, which may be useful if Resistor R3 is installed.
OUT
The different SOT-23-3 layout options are outlined in the diagram below, with Opt 1,
Opt 2, Opt 3 and Opt 4 indicating the layout option of that SOT-23-3 footprint.
Resistor R1 is a pull-up resistor that may need to be installed for devices with an
open-drain output. Though resistor R2 is not currently required, it was placed for
possible future requirements. Resistor R3, too, is not required, but may be useful if this
board is to be interfaced into existing circuits. If resistor R3 is to be installed, remember
to cut the trace that “shorts out” R3. Capacitors C1 and C2 are bypass capacitors that
may be required to be installed, depending on the device selected and the system
requirements (such as the noise present on the power supply). Table 2-2 describes the
components.
The Voltage Supervisor SOT23 Evaluation Board PCB is designed to be flexible in the
type of device evaluation that can be implemented.
The following sections describe each element of this evaluation board in further detail.
2.4.1Power and Ground
The Voltage Supervisor SOT23 Evaluation Board can have connection posts installed
for the power (V
surface-mount connectors.
For device evaluation, the use of an external variable power supply or waveform
generator is required. The type of equipment used will determine the evaluation that
may be performed.
) and ground (VSS) planes. The layout allows either through-hole or
DD
2.4.2Output (V
OUT
)
The Voltage Supervisor SOT23 Evaluation Board can have a connection post installed
for the output (V
) signal. The layout allows either a through-hole connector or a
OUT
surface mount connector.
For device evaluation, the use of an oscilloscope or digital volt meter (DVM) is required.
The type of equipment used will determine the evaluation that may be performed.
2.4.3SOT-23-3 Footprints
There are four SOT-23-3 pinout options that the Voltage Supervisor SOT23 Evaluation
Board PCB supports. Figure 2-3 shows these four pinouts. Some devices may use different nomenclature for the pin names, such as GND instead of V
and RESET (or RESET
) or RST instead of V
OUT
.
Other Microchip analog devices may be used with this PCB if the power and ground
pins match one of these four options. Appendix C. “Microchip Analog SOT-23 Device Compatibility” discusses other Microchip analog devices that may be used
with this PCB.
FIGURE 2-3:PINOUT OPTIONS
Option 1
V
DD
3
Option 2Option 3Option 4
V
DD
3
V
SS
3
, VIN instead of VDD
SS
V
SS
3
V
OUT
1
V
2
SS
1
VSSV
OUT
2
1
2
V
V
DD
V
OUT
OUT
1
2
V
DD
2.4.4Passive Components (C1, C2, R1, R2 and R3)
The footprints for these components are present to allow maximum flexibility in the use
of this PCB to evaluate a wide range of SOT-23-3 devices. The purpose of these components may vary depending on the device under evaluation and how it is to be used
in the desired circuit. Please refer to the device data sheet for the components that
should be used when using that device.
When evaluating a Voltage Supervisor or Voltage Detector device, a minimum set of
test equipment should be available. Table 2-3 shows the recommended test
equipment.
TABLE 2-3:TEST EQUIPMENT
HardwareConnect to:Comment
Variable Power
Supply
Arbitary
Waveform
Generator
Digital Multi-Meter
(D.M.M.)
OscilloscopeV
Test Light (LED)V
Installation and Operation
VDD, VSS This allows the voltage to the SOT23 Evaluation Board
to be varied so the device output can be monitored.
VDD, VSS This is like a variable power supply, but allows program-
ablity into the input signal that the device will be
subjected to. This also allows a particular waveform to
be repeated (such as a 60 Hz sine wave that varies from
1V to 5V)
V
OUT
OUT
OUT
Used to indicate the output state (Low or High) of the
Voltage Supervisor/Voltage Detector.
Allows the device conditions and response to be better
evaluated due to the ability to capture this information.
This is useful for faster signals and cases where small
spikes need to be detected.
Used to visually indicate the output state (low or high) of
the Voltage Supervisor/Voltage Detector. Ensure that the
current requirements of this light can be supplied by the
device’s output pin.
A typical system that would be used to evaluate the voltage supervisor or voltage
detector device is shown in Figure 2-4. Figure 2-4 also shows an example input and
output waveforms for a voltage supervisor or voltage detector device.
FIGURE 2-4:EVALUATION SYSTEM
Variable
Power
Supply
or
Arbitary
Waveform
Generator
Arbitary Waveform
Generator
Output
Test
Point or
V
OUT
SOT23 Evaluation Board PCB
Voltage
Supervisor
or
Voltage
Detector
Device VDD out of Valid Operating Range
Output voltage may be indeterminate
Appendix C. Microchip Analog SOT-23 Device Compatibility
C.1INTRODUCTION
This appendix documents other Microchip analog devices that can be evaluated using
this PCB. New devices may be introduced after the publication of this document that
may be supported. Compare the pinout of the device to the PCB schematic/layout to
determine compatibility of any SOT-23-3 (3-pin SOT-23) packaged device.
C.2PCB COMPATIBILITY
There are four SOT-23-3 (3-pin SOT-23) pinouts that the Voltage Supervisor SOT23
Evaluation Board PCB supports. Figure C-1 shows these four pinouts. Other Microchip
analog devices may be used with this PCB if the power and ground pins match one of
these four options. Though these devices may use different nomenclature for the pin
names, as long as the power and ground signals match one of the four options, this
PCB should be able to be used to evaluate that device.
Table C-1 shows the Microchip analog device part number, the analog family the device
belongs to, which footprint option to use and the recommended components to use for
the circuit. Please refer to the device data sheet for complete information of the application circuit.
Voltage Supervisor SOT23 Evaluation Board User’s Guide
TABLE C-1:MICROCHIP ANALOG DEVICES AND SOT23 EVAL BOARD
CIRCUIT/FOOTPRINT OPTION SELECTION
DeviceDevice Family
MCP1700LDOOption 2C1 = 1 µF Ceramic
MCP1701LDOOption 2C1 = 1 µF Tantalum
MCP1525Voltage ReferenceOption 3C1 = 0.1 µF
MCP1541Voltage ReferenceOption 3C1 = 0.1 µF
TC59LDOOption 4C1 = 1 µF Tantalum
C.3IDEAS ON EVALUATING AN LDO
One of the characteristics that a designer may wish to evaluate on a LDO is how the
LDO responds to transient loads. Figure C-2 shows a system block diagram for
evaluating a LDO and a typical waveform response (at test point) for the function
generator signal. The output of the function generator connects to a BJT transistor to
simulate the fast switching loads of the circuit.
The value of C2, R3 and C
Look at both the worst-case amplitude load requirements for a loaded and unloaded
system. As the output response of the LDOs become faster, the selection of a smaller
(cheaper) output load capacitor (C
performance).
will depend on the LDO used and the load of the circuit.