MOST - Roadmap Physical Layer & Connectivity from 150Mbps to 5Gbps 13th MOST(R) Interconnectivity Conference Asia on November 15, 2012 in Seoul, South Korea Andreas Engel Manager Advanced Infotainment Development
TE Connectivity: A World Leader Enabling Connectivity Serving Large Attractive Markets Automotive Communications Energy Consumer Products Industrial Equipment Aerospace & Defense Healthcare A Broad Range of Connectivity Products and Technology Connectors Fiber Optics Precision Circuit Sealing & Wireless Touch Solutions Wiring Protection Protection Extensive Global Resources 7,000 Engineers Close to our Customers 5,000 Salespeople Advising our Customers 150 Countries Served 97 Manufacturing Sites Serving Every Region page 2
TE Connectivity - Automotive - Infotainment Supporting optical, electrical and coaxial Physical Layer MOST Technology RF FAKRA Technology RF Stripline Technology TE HSD
MOST General Connectivity Overview Module: 2+0 Flexible Pigtails Module: 2+4 Micro Pigtails Integrated Pigtails Module: 2+12 Module: 2+20 Module: 4+40
Divider Slide Title New connectivity solutions - MOST 150
MOST Connectivity What s New Micro Pigtail Fully Shielded MOST 150 Compliant Reflow solder able according JEDEC standard (depending on FOT) Micro Pigtail 180 one & two piece MOST 150 Compliant Two piece version is reflow process compatible Reflow solder able according JEDEC standard (depending on FOT) Flex Pigtail two piece version MOST 150 Compliant Compatible with existing MOST headers Reflow solder able according JEDEC standard (depending on FOT)
New MOST Micro Pigtail 180 in detail Variants: one piece two piece (reflow) TWO PIECE H E A D E R MOST 150 FOT Types: Hamamastu (reflow) AVAGO (reflow in qualification) F O T
New MOST Flex Pigtail in detail - Two Piece variant Interface to MOST header: 2/4 position TWO PIECE F O T MOST150 FOT Types: Hamamastu (reflow) AVAGO (reflow in qualification) MOST25 FOT Types: 2/4 pos assembly AVAGO (reflow / wave soldering) Hamamastu (wave soldering)
New MOST Flex Pigtail in detail - Two Piece Termination: 1. Vertical 2. Horizontal app. 4.5mm Klick!
Divider Slide Title MOST - Physical Layer & Connectivity 5Gbps
MOST 5Gbps connectivity roadmap Optical Fiber & Cable Concept Connector Concept Power Budget Estimation Termination Process Concept Pro & Con Butt coupling vs. expanded beam Conclusion
Optical Fiber for 5Gbit/s Automotive use Jacket (2.3mm) Buffer (1.5mm) with embedded strength member yarn Soft buffer layer (0.47mm) Coating Layer (250µm) 85/125µm GI-Fiber
Optical Fiber for 5Gbit/s Automotive use 500MHz*km sufficient bandwidth for up to 10Gbit/s over 40m link Bigger core diameter better coupling efficiency versus Smaller glass fiber diameter enable lower bending radii Proposal: 85/125µm graded index all glass fiber Coupling tolerances more relaxed as with 50 or 62.5/125µm fiber
LC connector design as functional principle FOT Device housing Lensed ferrule Plug Cable Device Connector Harness Connector
Connector concept overview in detail In Orange: Device connector In Blue: Harness connector FOT package VCSEL or Photo Diode Device housing Lensed ferrule Ferrule Fiber Plug housing
Attenuation Budget Estimation Device 1 Inline Coupler Device 2 couling loss nominal 1dB couling loss nominal 1dB couling loss nominal 1dB tolerances +3dB tolerances +0.5dB tolerances +0.25dB worst case 4dB worst case 1.5dB worst case 1.5dB Attenuation [db] VCSEL into fiber coupling 4 Inline Coupler 3 times 4,5 Fiber into PD coupling 1,5 Fiber losses in total 0,5 Buffer for aging, contamination 1,5 VCSEL out 0dBm Maximum Link loss 12 db PD in -12dBm
Fiber & Cable Termination Process Concept
Expanded beam - versus - Butt coupling comparison Expanded beam Pro " + axial tolerance relaxed spring loading not mandatory beam diameter enhanced dust contamination influence low vibration robustness higher protection of fiber surface automotive processes applicable LASER-cleaving & welding possible Con " fiber to lens position sensitive Fresnel loss between lens / air absorption of light in lens material Butt coupling (physical contact) Pro " + physical contact low Fresnel loss no additional light absorption simpler ferrule design limited number of tolerances Con " critical tolerance field axial & radial spring loading is standard fiber end face preparation critical gluing & polishing as standard process dust contamination influence high vibration robustness open (friction) no protection of fiber surface
Example Impact due to Dust Particles - Simulation Consider randomly distributed dust particles of 20 µm at a lens interface with a spot diameter of 50 µm, 80 µm and 200 µm. 50 µm 85 µm 200 µm 100 50 µm 85 µm 200 µm dust frequency Transition 1 to 2 obscuring particles Y [µm] 50 0-50 -100 0 0.5 1 1.5 2 2.5 3 3.5 4 attenuation [db] -100-50 0 50 100 X [µm] In case the particles obscure a 50 µm spot, the attenuation increases rapidly evidenced by the long tail. However, for a 200 µm spot there is a mean attenuation (dependent on the number and size of dust particles), but a much more desirable distribution.
System Stability at Automotive Environment Extract of Test Program for PCS Connectors (2005) all test passed with 200µm glass core fiber / compatible to expanded beam
Conclusion Expanded beam design provides a more dust and vibration insensitive system Connector tolerances are more relaxed and simpler to handle & more robust Automotive proven processes are available (Laser cleaving & welding) -> A reliable system for high speed automotive connectivity
page 22 / August 2011