1. Safety Standards & Block-Block Interface Definitions
Lab 2A
Safety Standards & Block-Block Interface Definitions
Objectives
Introduction to Global Safety Standards
Determine the product main applicable safety standards
Update-Associate PL to Block Level Standard Requirements
Deliverable 1 (Team Deliverable)
Find and Document at least 3 Safety Standards applicable to your product using at least 1 from UL
Find and Document at least 2 Specific Safety Devices that you will incorporate in your design and where they will be used
Capture 1 and 2 above on at least 1 Product Safety Slide summarizing the above Safety Standards and Devices – Add this slide to your overall presentation

2. Block Interface Signals
Lab 2A
Block Interface Signals
Deliverable 2 – Individual Assignment for Block Owners
For Each Design Block: Define and document all of your Block-Block Interface Signals in the spreadsheet template included within the 3 main areas:
Power Signals including Power Consumed, Power Supplied
Digital Interface Signals (including busses)
Analog Interface Signals
Review ALL “Inter-block” signals and document Approval and “OK” in your spreadsheets to record signal agreements.
See attached Block Interface Signal Table Excel Tool
Summary Tab is Locked
Data Flows from Power, Digital and Analog Tabs
Some Cells have pull-down selections, Others are Free Form Values
BLOCK OUTPUTS NEED TO AGREE WITH BLOCK INPUTS !!!
Deliverables for each block include:
Block Interface Excel File – Electronic
Powerpoint Summary Slide – Electronic and Paper

3. Block Signal Table: Power
Lab 2A
Block Signal Table: Power
Power Signal Design Guidelines
Assume ALL Blocks will consume and/or provide power
Consumers must provide worst case demand to Providers (owners)
Blocks that supply power may also consume it and must allow for their inefficiencies
If you have bipolar (+/-) analog signals you will need split supplies
Power Supply Margin = ~50%
Try to keep DC voltage supplies at standard values including 3.3, 5, 9 and 12 VDC
Must specify both nominal and range of voltages
Must specify maximum total current for each voltage
Frequency range for AC voltages
Specify % regulation and max voltage ripple for DC voltages
Must specify Block-Block Interconnect Means for each signal
If a digital signal is also a power signal, treat it as a power signal

4. Block Signal Table: Digital
Lab 2A
Block Signal Table: Digital
Digital Signal Design Guidelines
A digital signal is one that conveys two levels of information (ie; 1/0, On/Off, etc)
Must classify direction from your block: Input, Output or Bidirectional
Must specify Block-Block Interconnect Means for each signal
For Inputs classify as Standard or Schmitt Trigger
Inputs must have Vih, ViL, (or Vth), Iih and IiL limits
For Outputs classify as Totem Pole, Open Collector, or Tristate
Outputs must have Voh, VoL, Ioh and IoL limits
If unsure, start by assuming Std TTL levels, Std Input, Totem Pole Output
Std TTL: Vih => 2.0V, ViL <= 0.8V, Iih <= 40uA, IiL <= -1.6mA; Voh => 2.4V, VoL <= 0.4V, Ioh <= -400uA, IoL <= 16mA
For noisy or slow transition digital signals, use a Schmitt trigger input
Consider optical isolation when digital signals are needed to control or sense power electronics or high voltage electronics

5. Block Signal Table: Analog
Lab 2A
Block Signal Table: Analog
Analog Signal Design Guidelines
By default if a signal is not a Power signal, nor a Digital signal it becomes an analog signal
Classify direction of the signal with respect to the block, Input, Output or BiDir
Must specify Block-Block Interconnect Means for each signal
Classify the coupling of the signal as Direct, Capacitive, Xfmr or Other
Classify the maximum voltage (amplitude), use peak values not RMS
For input signals, classify the min-max input impedance the signal will be loaded with
For output signals, classify the min-max output impedance the signal will be driven from
Classify the min-max frequency range for the signal
Finally list any appreciable leakage current allowed for the signal if applicable

6. Block Signal Table: Summary
Lab 2A
Block Signal Table: Summary
This tab is locked and all information flows from individual Power, Digital and Analog Tabs

7. EMC and Block Interface Signals
Lab 2B
EMC and Block Interface Signals
Objectives
Introduction to Electromagnetic Compatibility Stds
Introduction to Global AC Power and Stds
Document Applicable EMC Stds
Update your requirements at product and block level inputs to account for proper power and EMC specifications
Deliverable – Team & Individual Assignment
Update your Product Level Requirements to include all applicable EMC Stds your product should be tested to and the accompanying association to each of your Blocks – See List
Develop 1-2 slides describing overall product level EMC requirements as well as standard requirements for power inputs
Update the Excel Requirement Spreadsheet with the above and submit

8. EMC Standards Summary 318-595 Lab 2B
US/FCC: 47 CFR 15 - Radio Frequency Devices CFR 18 - Industrial Scientific and Medical Equipment
IEC: Electromagnetic compatibility - Requirements and tests EMC Part 3: Limits - Section 2: Limitation of harmonics in low-voltage supplies <16A EMC Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker in low-voltage supplies <16A EMC Part 3: Limits - Section 5: Limitation of voltage fluctuations and flicker in low-voltage supplies >16A EMC Part 4: Test/measurement techniques - Section 1: Overview of immunity tests EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests EMC Part 4: Test/measurement techniques - Section 3: Radiated radiofrequency immunity tests EMC Part 4: Test/measurement techniques - Section 4: Electrical fast transient/burst immunity tests EMC Part 4: Test/measurement techniques - Section 5: Surge immunity tests EMC Part 4: Test/measurement techniques - Section 6: Conducted radiofrequency immunity tests EMC Part 4: Test/measurement techniques - Section 7: General guide on harmonics measurement and instrum EMC Part 4: Test/measurement techniques - Section 8: Power frequency magnetic field immunity tests EMC Part 4: Test/ measurement techniques - Section 9: Pulsed magnetic field immunity tests EMC Part 4: Test/measurement techniques - Section 10: Damped oscillatory magnetic field immunity tests EMC Part 4: Test/measurement techniques - Section 11: Voltage dips, short interruptions and variations
CISPR: 11 Limits and methods of measurement for Industrial, Scientific and Medical Equipment Specifications for Radio Interference Measuring Apparatus and Measurement Methods Limits and Methods of Measurements of Radio Interference of Information Technology Equipment
For all applicable Stds, your Product Level Requirements should include Engineering Test Limits in addition to Certification Test Limits