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Simple Layout Class 1. Making A Hardware Board. Define system requirements. Finding components and design circuit. PCB board. Capture Schematic. Professional PCB manufacturers. Soldering Components. Printed Circuit Board (PCB) layout. Home made PCB prototype. Testing. Typical Process.

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simple layout class 1

Simple Layout Class 1

Wireless Sensor Network And Labs fall 2011

making a hardware board
Making A Hardware Board

Define system requirements

Finding components and design circuit

PCB board

Capture Schematic

Professional PCB manufacturers

Soldering Components

Printed Circuit Board (PCB) layout

Home made PCB prototype

Testing

Wireless Sensor Network And Labs fall 2011

typical process
Typical Process
  • Define requirements
  • Get the circuits
    • Design from scratch
    • Google
    • Ask some one who know
  • Find components
    • Which IC you want to use
  • Create component libraries in the PCB software
  • Capture schematic
    • Draw the circuit on the PCB software
  • Layout
    • Decide the shape of the board
    • Placing components
    • Make connections
  • Make the hardware board
    • Export layout to manufacturer output, send to PCB manufacturer
    • Home made PCB

Wireless Sensor Network And Labs fall 2011

today s class
Today’s Class
  • Introduction
  • Create schematic library
  • Capture schematic
  • Next week
    • Create PCB library (footprint)
    • Layout

Wireless Sensor Network And Labs fall 2011

first of all schematic
First Of All -- Schematic

Rectangle with numbers are usually connector

Rectangle with pin names are usually components

Usually on the schematic or their description, they will tell you what component it is (part number). You can find the datasheet of the component from Internet

Wireless Sensor Network And Labs fall 2011

taroko schematic
Taroko Schematic

Switches

LEDs

Light sensors

Wireless Sensor Network And Labs fall 2011

real device and schematic
Real Device And Schematic

There will be a designator for each component on schematic. And it is 1-to-1 map to the PCB board

Wireless Sensor Network And Labs fall 2011

map to real device
Map to Real Device

Wireless Sensor Network And Labs fall 2011

map to real device9
Map to Real Device

Wireless Sensor Network And Labs fall 2011

map to real device10
Map to Real Device

Wireless Sensor Network And Labs fall 2011

resources available on internet
Resources Available On Internet
  • Books
  • Google
  • Application notes
    • A document which gives more specific details on using a component in a specific application
    • Provided by IC manufacturers
      • Example: TI MSP430 application notes
  • Reference design
    • Especially RF IC
    • Example: CC2420 reference design

Wireless Sensor Network And Labs fall 2011

search for datasheet
Search For Datasheet
  • M25P80
    • Datasheet
      • 8 Mbit, low voltage, serial Flash memory with 75 MHz SPI bus interface
    • It is a flash memory
  • SHT11
    • Datasheet
      • SHT1x / SHT7x
    • Temperature and Humidity Sensor

Wireless Sensor Network And Labs fall 2011

what to look in datasheet
What To Look In Datasheet
  • Functionality
    • What does this IC do
  • Electrical Characteristic
    • Supply voltage
    • Current consumption
    • Etc
  • Application Information
    • How to make it work
  • Packages
    • What is the IC looks like
    • Shape, size, pins design, pitch, etc.

Wireless Sensor Network And Labs fall 2011

m25p80 datasheet
M25P80 Datasheet

SPI interface

Wireless Sensor Network And Labs fall 2011

m25p80 signal description
M25P80 Signal Description

SPI interface

Wireless Sensor Network And Labs fall 2011

connect m25p80 and msp430
Connect M25P80 and MSP430

Pin 2, 5, 6 is SPI interface on M25P80, connected to SPI interface of MSP430

Chip select and Hold pin connected to GPIO pins on MSP430

Write Protect is connected to Vcc, that means we are not using write protect function

GPIO on MSP430

SPI interface on MSP430

The SPI interface is shared with radio chip

Wireless Sensor Network And Labs fall 2011

m25p80 datasheet17
M25P80 Datasheet
  • Usually at the end of the datasheet, there will be some section call “Packaging information”, “Package”, ……
  • This section contain the information about how the chip looks like
  • Lets take a look at the common packages

Wireless Sensor Network And Labs fall 2011

m25p80 packages
M25P80 Packages
  • A chip may have more than one package
    • M25P80 has three
  • Package information gives you the footprint of the chip

Wireless Sensor Network And Labs fall 2011

slide19
SO8W
  • We use M25P80 SO8W package on Taroko

e

b

E

E1

A dot here defines pin #1

Wireless Sensor Network And Labs fall 2011

through hole vs smd
Through-hole vs SMD
  • Through-hole
    • A mounting scheme
    • Pins inserted into holes drilled in PCB and soldered to pads on the opposite side
      • Expansion connector on Taroko
      • Light sensor on Taroko
  • SMD: surface mounted device
    • Components are mounted directly onto the surface of PCB
      • Many devices on Taroko are SMD
      • Resistor, capacitor, MSP430, and more.

Wireless Sensor Network And Labs fall 2011

through hole packages
Through-hole Packages
  • SIP: single in-line packages
  • DIP: dual in-line packages

Through-hole package are old, their number decreased in modern design

Wireless Sensor Network And Labs fall 2011

smd packages
SMD Packages
  • Chip resistors, capacitors, inductors
    • 0402, 0603, 0805, …
      • Represent size of the chip
      • 0805 means 0.08” x 0.05” rectangle

Wireless Sensor Network And Labs fall 2011

smd packages23
SMD Packages
  • SO: Small outline
    • Usually refer to IC with two rows of leads
  • QFP: Quad flat package

Wireless Sensor Network And Labs fall 2011

smd packages24
SMD Packages
  • QFN: Quad flat package, no-leads
  • The packages we introduced just now are most commonly used
    • Device datasheet should include the package information
    • You will need it for PCB layout

Wireless Sensor Network And Labs fall 2011

smd packages25
SMD Packages

These two are widely used in high end processor. They allow more pin-out from a single package. We seldom use ICs in these package, it is too difficult to solder by hand

  • BGA: Ball Grid Array
  • PGA: Pin Grid Array

Wireless Sensor Network And Labs fall 2011

power
Power

what about Power?

?

Power

USB is 5V, MSP430 operating range is 1.8V ~ 3.6V. How to get supply power from USB?

MSP430

CC2420 Radio

USB

Sensors, memory, LEDs, switches, expension

Wireless Sensor Network And Labs fall 2011

regulator
Regulator
  • A semiconductor device that converts an input DC voltage (usually a range of input voltages) to a fixed-output DC voltage
  • Many types of regulators, most commonly used
    • Linear regulators
    • Switching regulators
  • You might accept power supply from various sources with different voltage, but you need a stable voltage for your system
    • Use a regulator

output

input

Regulator

3.3V (fixed)

(5V ~ 40V)

Wireless Sensor Network And Labs fall 2011

linear regulator
Linear Regulator

Switching Regulator can step up the voltage

input

output

(3.3V)

Linear regulator

5V

  • Output voltage < input voltage
    • All linear regulators require an input voltage at least some minimum amount higher than the desired output voltage
      • This minimum amount is called drop-out voltage
    • You can only step down the voltage
  • Inefficient, power dissipated as heat

Power provided at the output = 5V * 60mA = 300mW

Power provided at the output = 3.3V * 60mA = 198mW

output

input

Regulator

3.3V (fixed)

(5V ~ 40V)

Power dissipated on regulator

= 300mW – 198mW

= 102mW

Taroko

Taroko current consumption=60mA

Wireless Sensor Network And Labs fall 2011

key parameters of regulators
Key Parameters of Regulators
  • Input voltage range
    • A range of possible input voltage
  • Output voltage
    • Fixed to some value
    • Adjustable
      • Can be adjust by some external resistors
  • Maximum output current
    • Maximum current allowed
  • Drop-out voltage

Wireless Sensor Network And Labs fall 2011

linear regulator ics
Linear Regulator ICs

U25 on Taroko

  • MCP1700T-3302TT (on Taroko)

Wireless Sensor Network And Labs fall 2011

typical application circuit
Typical Application Circuit
  • Usually the datasheet has the typical application circuit

Wireless Sensor Network And Labs fall 2011

why to buy
Why To Buy
  • You have a schematic, and already found out what is the components on it
    • But, where to buy?
  • Various sources
    • Online retailers
      • www.digikey.com
      • www.mouser.com
    • Local distributors

These are probably two of the world largest online electronic components retailers. If the component you need cannot buy from these two sources, you might want to consider the other component!

Wireless Sensor Network And Labs fall 2011

putting things together
Putting Things Together
  • Hardware prototyping
    • Breadboard
    • Printed Circuit Board

Wireless Sensor Network And Labs fall 2011

breadboard
Breadboard
  • Fast and easy
  • Signal unstable and inaccurate
  • Ugly!
  • Un-professional

Wireless Sensor Network And Labs fall 2011

printed circuit board
Printed Circuit Board
  • Take some time
  • Professional
  • Signal is more stable

Home made PCB

Industry fabrication PCB

Wireless Sensor Network And Labs fall 2011

slide36
Goal
  • Design a term project control board
    • Replace the Breadboard
    • Place on you robot car
    • Has Connectors to connect two Taroko’s
      • Location node
      • Control node: receive infrared, control motor, receive location
    • Provide power supply for Taroko
    • Has connectors to connect two infrared sensors
    • Has connectors to connect two motor (PWM output)

Wireless Sensor Network And Labs fall 2011

block diagram
Block Diagram

Connector

3-Pin

Infrared

6V

Connector

3-Pin

Infrared

Taroko

Location node

3.3V

Regulator

LM317L

Taroko

Control node

3.3V

Battery

4 AA

6V output

6V

Connector

3-Pin

Motor

Connector

3-Pin

Motor

Wireless Sensor Network And Labs fall 2011

components
Components
  • Battery connector: 2-pin,
  • Regulator: LM317L, 8-pin SOIC
    • Resistor, capacitor
  • Taroko connector
    • Location node: 2x5 pin, 2x3 pin
    • Control node: 2x5 pin, 2x3 pin
  • Infrared connector: 3 pin
  • Motor connector: 3 pin

Wireless Sensor Network And Labs fall 2011

pcb layout
PCB Layout
  • Software
    • We are using “Altium Design 6”
    • There are many other software available
  • Process
    • Initial setup
    • Create schematic library
    • Capture schematic
    • Create PCB library
    • PCB layout
    • Output

Wireless Sensor Network And Labs fall 2011

tools
Tools
  • Altium Designer
    • http://www.altium.com/products/altium-designer/en/altium-designer_home.cfm
  • Trial version
    • https://trial1.altium.com/?lang=us#:1sy923989

Wireless Sensor Network And Labs fall 2011

altium designer 6
Altium Designer 6
  • Electronic product development solution
    • Schematic capture
    • PCB Board design
    • Simulation
    • FPGA design
    • etc.
  • We will use it to do the PCB layout

Wireless Sensor Network And Labs fall 2011

schematic and pcb
Schematic And PCB

Layout

Create Schematic

Wireless Sensor Network And Labs fall 2011

beginning
Beginning

Empty layout

Blank schematic sheet

Wireless Sensor Network And Labs fall 2011

create components library
Create Components (Library)

1. Create schematic components

2. Create PCB footprint

3. Link schematic and PCB components

Wireless Sensor Network And Labs fall 2011

capture schematic
Capture Schematic

1. Place components on sheet

2. Make connection

Net_A1

Net_A1

Wireless Sensor Network And Labs fall 2011

compile and export
Compile And Export

According to you schematic, export footprint to PCB

Wireless Sensor Network And Labs fall 2011

layout
Layout

Polygon Pour

Define outline

Make connection

Place components

Wireless Sensor Network And Labs fall 2011

pcb layout process
PCB Layout Process
  • Process
    • Initial setup
      • Create design workspace
      • Create PCB project
      • Add new “Schematic”, “PCB”, “Schematic library” and “PCB library”
    • Create schematic library
    • Capture schematic
    • Create PCB library
    • PCB layout
    • Output

Wireless Sensor Network And Labs fall 2011

schematic library
Schematic Library
  • Component list (what components you need)
    • LM317L
    • Miscellaneous components
      • Resistor
      • capacitor
      • connectors
  • Schematic library contain the components you will use
    • Altium Designer has a collection of libraries
      • Search the libraries
      • If the components you want is not in the libraries provide, you have to create one (both AD7798, ADXL330 was not found)
        • Create library components for AD7766 and ADXL330
      • Copy Miscellaneous components

Wireless Sensor Network And Labs fall 2011

capture schematic50
Capture Schematic
  • Schematic library are ready
  • Capture Schematic
    • 01
    • 02

Vcc

Vcc

GND

Vcc

Give every power supply line a 0.1 μF capacitor

Xout

2

4

6

8

Yout

Zout

REFIN(-), AIN1(-), AIN2(-), AIN3(-) connect GND

Vcc

Wireless Sensor Network And Labs fall 2011

the schematic
The Schematic

Wireless Sensor Network And Labs fall 2011

slide52

Create your own schematic

Wireless Sensor Network And Labs fall 2011