DLW43MH201XK2

Noise suppression technologies/case study introduction (Automotive)
INDEX
Onboard Ethernet:"Communication systems used in automobiles"
Various interface standards are used in automobiles, depending on the application.
Table 1: Communication systems used in automobiles
Communication system | Speed | Applications, features |
---|---|---|
CAN/LIN | 33k/125k/250k/500kbps | Onboard LAN standard adopted for general ECUs |
FlexRay | 2M/5M/10Mbps | Used in the powertrain, chassis, and other control systems |
MOST | 25M/50M/150Mbps | Adopted for use in onboard audio multimedia systems |
Ethernet | 100M/1Gbps | PC LAN standard, also used in diagnostics 100BASE-TX, 100Base-T1 |
Table 2: Onboard Ethernet standards
Standard | Transmission speed | Number of pairs | Notes |
---|---|---|---|
100Base-T1 | 100Mbps | 1 pair | Supports full-duplex communication at 100 Mbps with 1 pair. Standardized by OPEN Alliance. |
100Base-TX | 100Mbps | 2 pairs | Based on the existing 100Base-TX and used to improve onboard EMC performance. |
RTPGE (1000Base-T1) |
1000Mbps | 1 or 2 pairs | Being reviewed for standardization by IEEE. The standard reduced the amount of wiring in the existing 1000Base-T for vehicle and industrial device applications. |
In differential transmissions including Ethernet, noise occurs due to a common mode current caused by various factors.
The cables used for Ethernet are different from USB and HDMI cables.
Onboard devices have a shorter antenna distance and stricter limit values than consumer products.
Recommended!
A common mode choke coil is an effective way to suppress noise in a differential transmission.
You can selectively drop just the common mode!
We recommend the DLW43MH series as the optimal common mode choke coil for 100Base-T1 noise suppression.