1 pair or 2 pairs for RTPGE: Impact on System Other than the PHY

Transcription

1 1 pair or 2 pairs for RTPGE: Impact on System Other than the PHY Part 1: Weight & Space Contributors: Kirsten Matheus, BMW Michael Kaindl, BMW Stephane Korzin, Renault Doarte Goncalvez, PSA John Leslie, JLR Yasuhiro Okuno, Honda Nobukatsu Kitajima, Renesas Mike Gardner. Molex Richard Orosz, Yazaki Matthias Jaenecke, Yazaki Dongok Kim, Hyundai Richard Mei, Commscope Dietrich von Knorre, S-Y Supporters: Mehmet Tazebay, Broadcom Helge Zinner, Continental Thomas Suermann, NXP. IEEE interim, RTPGE TF, Phoenix January 2013

2 Motivation This slidesetcompares the impact the decision to use 1 pair or 2 pairs for RTPGE has on the system other than the PHY The 5 principle comparison criteria are: The logic performance The EMC performance The power consumption The weight and space use The (relative) costs Mainly PHY concepts related and therefore not considered in this presentation Part 1: Focus of this presentation Potential Part 2 Relevant aspects for system comparison other than PHY 2

3 Elements Considered for PCB Power supply, clock, I/O interfaces PHY Mag MDI Harness Cables Connectors power consumption PCB Power supply, clock, I/O interfaces PCB Power supply, clock, I/O interfaces PHY PHY Mag MDI Mag MDI Harness Cables Harness Cables Connectors Connectors weight space Focus of this presentation PCB Power supply, clock, I/O interfaces PHY Mag MDI Harness Cables Connectors costs 3

4 Input Data Topologies investigated ECU connections considered Cable values Connector values Use of multi-pin connectors 4

5 Topologies Investigated (1) Topology 1 Topology 2 (see back up also) SEN 1 CAM 1 SEN 3 15m PCB 1 PCB 2 Equidistant inline connector rs (worst case) 2,5m 0,7m 0,7m DAS Disp.1 Disp. 2 CGW CAM 2 CAM 3 0.5m 2m 1,5m 3m 1,5m DAS 1 I&C 3m 4m DAS 2 2m 1m 2m I&C 3 I&C 4 5m I&C 1 5m I&C 2 Disp.3 9m 8m*) 6m RSE I&C 5 0,5m 6m Disp.4 10m 1Gbps 100Mbps SEN = Sensor Disp = Display CAM = Camera CGW = Central Gateway DAS = Driver Assistance Dark = Main units for domain I&C = Infotainment and Communication CAM 4 SEN 2 *) Average cable length for 1Gbps (not considering inline connectors) is 3,15m, 3,5m for Ethernet in general 5

6 Topologies Investigated (2) Topology 1 Topology 2*) Overall length of cabling [m] 15m 50m Number of links 1 16**) Number of MDIs 2 32**) Number of inline connectors 4 13 Number of cable segments 5 29 Number of PHYs 2 11 Number of Switches 0 5 *) only 1Gbps **) one redundant link 6

7 ECU Investigated Type of connections Example Connections to I&C ECU Number of those connections Number of pins per connections Number of pins Connectors power supply*) multipin analogue out*) multipin CAN multipin microphones multipin aux in multipin 100 Mbps multipin other multipin Σ connectors/pins To antennas dedicated USB dedicated Σ connectors/pins 12 Gbps 7 3/5 21/35 Tbd. *) requires larger pins / pin spacing 7

8 Type UTP; 0,18mm² Cable Values*) weight[g/m] diameter [mm] Subtype one pair two pairs one pair two pairs no jacket 5,30 2x1pair 2,24 4,29 one jacket 20,22 5,94 individual 12,00 3,78 2x1pair 7,62 jackets no jacket 9,27 2x1pair 2,54 4,87 one jacket 32,96 6,81 UTP; 0,35mm² 20,18 4,04 individual 2x1pair 8,13 jackets Coax 14,26 2x1pair 3,20 6,55 one shield 40,45 7,27 STP individual 25,69 4,72 2x1pair 9,49 shields *) Averaged input from 6 independent sources 8

9 Connector Values Type weight [g] PCB inline Multipin 2 pins 2,24 2,40 Coax 3,2 2,30 Shielded (1/2pairs) 6,4/7,2 9,00 Type Size backplane W[mm] H[mm] Multipin 2 pins 4,5 8 Coax Shielded *) W H L *)Assumed to be the same for 1 pair or 2 pairs 9

10 Example Multipin-Connector Use Inline PCB mounted (MDI) 1 pair 4,3 per link 3,5 per link 5,0 per link 3,5 per link 2 pairs 7,0per link 5,7 per link 7,0 per link 5,7per link RTPGE 1st link RTPGE 2nd link Empty Other 10

11 Results Weight Space 11

12 Impact on Weight Topology 1 additional weight of second pair [kg] 1,40 1,20 1,00 0,80 0,60 0,40 0,20 0,00 From connectors/mdis From cabling An additional pair of wires adds between 0,37 and 1,35 kg of weight in a fully equipped car Topology 2 additional weight of second pair [kg] 1,40 1,20 1,00 0,80 0,60 0,40 0,20 0,00 From connectors/mdis From cabling Weight affects CO2 emission and costs directly 12

13 Impact on Space Using MultipinConnector for RTPGE 1,5 DIN = 75mm 50mm 1 DIN = Ventilation Antenna connectors Multi-Pin Connector 2nd pair 180mm Cooling 1 pair RTPGE USB 100 Mbps Example back plane of I&C ECU with one horizontal an one vertical PCB Extending the size to 1,5DIN has little effect as some connectors (antennas, Ethernet, USB) need to be directly connected to PCB Space is sparse. A fully equipped I&C ECU cannot accommodate the second pair. 13

14 Impact on Space Using Distinct Connectors for RTPGE 1,5 DIN = 75mm 50mm 1 DIN = Ventilation Antenna connectors Multi-Pin Connector 180mm Cooling USB 100 Mbps Example back plane of I&C ECU with one horizontal an one vertical PCB Extending the size to 1,5DIN has little effect as some connectors (antennas, Ethernet, USB) need to be directly connected to PCB Having to use distinct connectors for the RTPGE links is unfavorable 14

15 Summary For the evaluation of the impact of a second pair needed for RTPGE transmission input data on the following topics was presented Topologies ECU connections Cable & Connector The automotive Ethernet use of multi-pin connectors In the topology shown a second pair adds between 0,37 and 1,3kg of weight (=CO2=costs) Additionally a second pair can easily overstrain the space constraints of communication intense ECUs 15

16 Back Up Material

17 Additional Info on Topology 2 Topology 2 is an example topology that does not represent any real car, but a combination of values from several For the channel (interference) model, other topologies need to be considered additionally. This topology has a maximum of 3 RTPGE cables next to each other The 100Mbps links have been added to indicate the playing field. The better the RTPGE solution the more links will be Gbps, the more expensive Gbps the fewer links will upgrade. Distribution of link length for Gbps Occurance in % 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% <1 <2 <3 <4 <5 <6 <7 <8 <9 <10 Number of links per length Accumulated number of links 17 Length in [m] (average 3,15m)