Staying Connected 24/7: Safeguard Consumer Electronics - PowerPoint Presentation

Slide1

Staying Connected 24/7:Safeguard Consumer Electronics with Proper Circuit Protection

Day 3:

Consumer Electronics StandardsSlide2

Circuit Protection & Standards for Consumer ElectronicsFulfill a most important role together:

Protect the valuable devices we depend on every day from damage caused by their

biggest threat

…… the USER!Slide3

Consumer Electronics StandardsCompliance standards established by IEC, ISO and other regulatory organizations provide guidelines for manufacturers to follow when designing, producing and testing consumer electronics designs. There are also global standards to keep in mind.

Today’s session addresses these

important standards:

Human Body Model (HBM)

IEC 61000-4-2

IEC 60950-1

IEC 62368-1ISO 10605Slide4

Compliance Challenges for Consumer Electronics

IC content continues

to

become smaller, faster and

more ESD sensitive.

Human Body Model (on-chip ESD decreasing)

IEC 61000-4-2 (many companies test above this spec)

ISO 10605 (harsher than IEC 61000-4-2)

Protection products

need to meet

AEC-Q101 when

used in automotive applications.

Protection devices will need to be robust enough for the transient environment, yet be able to clamp to a low enough level to protect the ICs

.

Safety standards focus on protection of consumer electronics from being a source of fire or shock hazards.

IEC 60950-1: Information Technology Equipment

IEC 62368-1: A/V, Information Technology, and Communications EquipmentSlide5

ESD Standards: Human Body

Model (HBM)

Wafer fab and back-end assembly environments

Based

on Skin-to-Metal Contact

e.g. Person touches pin of IC, discharging directly to pins

Used in Military Standard (883E) test specification

Addresses the

Manufacturing/Production

environment

T

esting is done directly on the IC Circuit Model:

Discharge Voltage Peak Current 500V 0.33A 1,000V 0.67A 2,000V 1.33A Testing is generally limited to 2kV level; factory ESD policies and personnel precautions limit the amount of static electricity that can be built up.Slide6

Focus is on field-level ESD in

applications

Based

on Metal-to-Metal Contact

e.g. Person with tool/key in hand discharges to I/O port

Used

in IEC 61000-4-2 test specification

Addresses the

user-environment

Testing

is done at the application or system level

Circuit Model:

Contact Discharge

Peak Current 2,000V 7.5A 4,000V 15.0A 6,000V 22.5A 8,000V 30.0A

ESD Standards:

IEC 61000-4-2 Slide7

Peak current Peak currentDischarge Voltage

Human Body Model

IEC 61000-4-2

500 V

0.33 A

1.5A

1,000 V

0.67 A

3.0A

2,000 V

1.33 A 7.5 A 4,000 V Does not apply 15.0 A 8,000 V Does not apply 30.0 AThe key here is that a chipset that survives Human Body Model testing (in the manufacturing environment) is not guaranteed to survive in the field, where the exposure to ESD will be much more severe.Different models yield much different peak current values; ultimately electrical stresses on the chipset are very different.

ESD levels in the field far exceed the values that can be generated in the manufacturing environment.Comparing the Two Specifications – IEC 61000-4-2 vs. Human Body ModelESD protection that is built into the ICs.

ESD threat that the application commonly experiences in the field.Slide8

Safety Standards: IEC 60950-1

Circuits designed as

Limited Power Sources

reduce the likelihood of fire hazardsTable 2B defines limits for LPS without overcurrent

protective devices (fuses)

Circuits designed as

Limited Current Sources

reduce the likelihood of electrical shock

For ≤ 1 kHz, steady-state current cannot exceed

0.7

mA

peak, 2.0

mA

dcFor > 1 kHz, current limit is 0.7 mA x freq. but no greater than 70 mA peakSlide9

Safety Standards: IEC 62368-1 New global safety standard that combines requirements from:IEC 60950-1: Information Technology Equipment

IEC 60065: Audio/Video Equipment

Uses a hazard-based safety approach, where requirements focus on fire & shock hazards and how to prevent them

Fewer rigid requirements – more design flexibilitySlide10

Where is ESD Protection needed for Tablets? (Reference IEC 61000-4-2)

Headphone port (audio)

ESD

transient

Buttons/switches

ESD

transient

DC input

Fault

current

ESD/surge

Memory slot (MMC, SD card) ESD transientUSB2.0/3.0 port Fault current ESD transient

LCD module ESD transient

SIM socket

ESD

transient

HDMI port

ESD transient Slide11

Audio (in/out) ESD transient

Memory slot (SD card)

ESD transient

Ethernet port

ESD transient

Surge/ESD transients

AC Input

Fault current

Surge

transient

DC InputFault current ESD/surge USB2.0 Port ESD transientUSB3.0 Port ESD transientHDMI PortESD transientKeypads/Buttons (On Front)ESD transient

Video (Comp.) ESD transientCable (F-Conn) ESD transient

eSATA

Port

ESD transient

Where ESD Protection is needed for Set-top Boxes?

(Reference IEC 61000-4-2)Slide12

Protection Solutions / Standards for Consumer Electronics in Automotive Aftermarket

Applications include:

Security Systems

Infotainment Systems

Audio Systems

Remote Start

GPS

Cellular/Wi-Fi Connectivity

For additional information, see the course:

Deliver

Roadworthy Designs:

Safeguard

Automotive Electronics Technologies with Proper Circuit Protection

Slide #12Slide13

ISO 10605: What does it apply to?

1 Scope

This

International Standard specifies the electrostatic discharge (ESD) test methods necessary to evaluate electronic modules intended for vehicle use. It applies to discharges in the following cases

:

ESD in

assembly

ESD caused by

service staff

ESD caused by

occupants

ESD

applied to the device under test (DUT) can directly influence the DUT. ESD applied to neighboring parts can couple into supply and signal lines of the DUT in the vehicle and/or directly into the DUT.This International Standard describes test procedures for evaluating both electronic modules on the bench and complete vehicles. This International Standard applies to all types of road vehicles regardless of the propulsion system (e.g. spark-ignition engine, diesel engine, electric motor).This International Standard is based in part on IEC 61000-4-2 and describes vehicle-specific requirements.Slide14

ISO 10605:

How is ESD applied?

9.3 Test

procedure

9.3.1

General

The test shall be performed by

direct contact discharge on all pins and contacts

,

and/or discharge mode on

all surfaces and points that can be touched during the assembly process

or in the service case.Apply the ESD at (as a minimum) each connector pin, case, button, switch, display, case screw and case opening of the DUT that is accessible during handling. For this procedure, recessed connector pins are considered accessible during handlingTo access recessed connector pins, an insulated solid wire with a cross-section between 0, 5mm2 and 2 mm2 and a maximum length of 25 mm shall be used.Slide15

10.1 GeneralChoose a generator capacitance of 330 pF for areas that can easily be accessed only from the inside of the vehicle and

resistance of 330 Ω

or 2 k Ω. the maximum test voltage can be limited in this case to 15 kV. Choose a capacitance of 150 pF for points that can easily be touched only from the outside

of the vehicle and resistance of 330 Ω or 2 k Ω. In this case, the maximum test voltage is 25 kV. Areas that can be touched both from the outside and inside shall be tested with both generator capacitance values and 15 kV and 25 kV maximum test voltage, respectively.

Before

applying any discharges to the DUT, verify that the ESD generator discharge verification procedure, as specified in Annex A, has been performed within the time period established by the laboratory or the customer.

D.1 Resistor value selection

Testing with 2 k Ω resistor represents the discharge of a human body directly through the skin. Testing with 330 Ω resistor represents the discharge of a human body through a metallic part (i.e. tool, key, ring). A test with a 330 Ω resistor is more severe than testing with 2 kΩ.

ISO

10605: ESD simulator models 330pF waveform 150pV waveform Slide16

For the test of electronic modules, the ESD generator shall be configured with the 330 pF or 150 pF capacitor , depending on the DUT location in the vehicle (see 10.1), and the 330 Ω resistor. If the DUT location is not specified, the 330 pF capacitor shall be used.

ISO

10605:

Overview of ESD Generator

P

arameters Slide17

Simulator model

Charging capacitor

Discharge resistor

Test voltage (max)

Environmental focus

Human Body Model

100 pF

1

,

5

00Ω

500V to 2,000V

Simulates the environment inside the factory environment (wafer fab/assembly

IEC 61000-4-2

150 pF

330Ω

15kV air discharge

Simulates the field level ESD to which applications will be subjected in the field

ISO 10605, interior

330 pF

330Ω

1

5kV contact discharge

Simulates ESD environment inside the automobile; also used for electronic modules

ISO 10605

, exterior

150 pF

330Ω

25kV air discharge

Simulates ESD environment around the exterior of the automobile

ESD Standards Summary:

Comparison of Major Standards Slide18

Thank You for your attention! Any questions?