TJA1102A
100BASE-T1 dual/single PHY for automotive Ethernet
Rev. 1 — 7 June 2021
Product data sheet
1 General description
The TJA1102A is a 100BASE-T1-compliant dual-port Ethernet PHY optimized for
automotive use cases such as gateways, IP camera links, radar modules, driver
assistance systems and back-bone networks. The device provides 100 Mbit/s transmit
and receive capability over two unshielded twisted-pair cables, supporting a cable length
of up to at least 15 m. The TJA1102A has been designed for automotive robustness,
while minimizing power consumption and system costs. For added flexibility, a single
PHY version is available (TJA1102AS) in which one of the PHYs is disabled. Unless
otherwise specified, all references in this document to TJA1102A encompass both the
dual- and single-PHY variants.
The TJA1102A supports OPEN Alliance TC-10-compliant sleep and wake-up request
forwarding, with an always-on power domain connected directly to the battery supply
without the need for a dedicated voltage regulator.
2 Features and benefits
2.1 General
• Dual-port 100BASE-T1 PHY; single-port operation possible
• Single-port variant available
• MII- and RMII-compliant interfaces
• HVQFN 56-pin package (8 × 8 mm)
2.2 Optimized for automotive use cases
• Transmitter optimized for capacitive coupling to unshielded twisted-pair cable
• Adaptive receive equalizer optimized for automotive cable length of up to at least 15 m
• Enhanced integrated PAM-3 pulse shaping for low RF emissions
• EMC-optimized output driver strength for MII and RMII
• MDI pins meet class IV conducted emission limit as per OPEN Alliance EMC
Specification 2.0
• MDI pins protected against ESD to ±6 kV HBM and ±6 kV IEC61000-4-2
• MDI pins protected against transients in automotive environment
• MDI pins do not need external filtering or ESD protection
• Automotive-grade temperature range from -40 °C to +125 °C
• Automotive product qualification in accordance with AEC-Q100
• Host-configurable MDI polarity
• Automated polarity detection and correction