This reference design provides 4 100Base-T1 and 1000Base-T1 automotive Ethernet ports to Jacinto 7 EVMs utilizing TI’s sturdy PHYs, BAW-based clocking, and environment friendly energy administration—ideally suited for ADAS, infotainment, and software-defined autos.
This reference design TIDA-020071 by Texas Devices (TI) permits seamless automotive Ethernet interfacing with Jacinto 7 processor analysis modules (EVMs) by the RGMII Ethernet Enlargement Connector. It provides 4 automotive Ethernet ports utilizing Texas Devices’ (TI) automotive-qualified bodily layer transceivers (PHYs): the DP83TC818S-Q1 supporting 100Base-T1 and the DP83TG721S-Q1 supporting 1000Base-T1 single-pair Ethernet (SPE). The design additionally demonstrates the flexibility to couple 12V energy onto the info line utilizing an automotive-grade filter community, making it appropriate for battery-connected automotive methods.
This setup helps each 100 Mbps and 1 Gbps automotive Ethernet by RGMII, enabling high-speed connectivity to Jacinto™ 7 processors utilized in a variety of in-vehicle methods. The board permits a typical clock to be distributed to all 4 PHYs through a TI Bulk Acoustic Wave (BAW) oscillator and a clock buffer. There may be additionally an choice to populate the BAW oscillator immediately on the board. The inclusion of a board ID EEPROM gives system-level identification for configuration and diagnostics.
The DP83TC818S-Q1 PHY is compliant with IEEE 802.3bw and Open Alliance requirements, supporting bodily layer features and versatile xMII interfaces over an unshielded single twisted-pair cable. It options the OA TC-10 low-power sleep mode and wake forwarding, making it ideally suited for power-sensitive automotive environments. The design additionally incorporates TI’s TPS7B82-Q1 and TPS74701-Q1 low-dropout (LDO) linear regulators to effectively handle energy. The TPS7B82-Q1 is particularly suited to always-on methods, working from 3V to 40V with load dump safety as much as 45V, and options an ultra-low quiescent present of two.7µA at gentle load. It ensures dependable energy throughout chilly crank and start-stop situations, ideally suited for automotive MCUs and transceivers.
In the meantime, the TPS74701-Q1 provides a user-programmable soft-start, power-good output, and allow management for sturdy sequencing of a number of energy rails. This helps steady start-up and operation for a variety of processors and ASICs. Complementing these elements, TI’s BAW know-how permits exact, low-jitter clock era with micro-resonators built-in immediately into the chip bundle—providing enhanced timing efficiency for high-speed knowledge communication.
Designed for purposes resembling superior driver help methods (ADAS), infotainment and cluster modules, physique electronics, and software-defined autos, this reference design gives a compact, environment friendly, and extremely built-in answer for automotive Ethernet connectivity and energy supply.
TI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra knowledge concerning the reference design. To learn extra about this reference design, click on right here.
