Design Files
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FlexRay Active Star Coupler – 4 Branch
The TJA1085G is a FlexRay active star coupler that can connect up to 4 branches of a FlexRay network. The TJA1085G is compliant with the FlexRay electrical physical layer specification V3.0.1/ISO17458-4
Several TJA1085G devices can be connected via their TRXD0/1 interfaces to increase the number of branches in the network. A dedicated Communication Controller (CC) interface allows for integration into an ECU. The TJA1085G supports low-power management by offering bus wake-up capability along with battery supply and voltage regulator control. The TJA1085G meets industry standards for EMC/ESD performance and provides enhanced bus error detection, low current consumption and unmatched asymmetric delay performance.
Product Details
Features
General Features
- Compliant with FlexRay Electrical Physical Layer specification V3.0.1/ISO17458-4
- Automotive product qualification in accordance with AEC-Q100
- Data transfer rates from 2.5 Mbit/s to 10 Mbit/s
- Supports 60 ns minimum bit time at 400 mV differential voltage
- Low-power management for battery-supplied ECUs
- Very low current consumption in AS_Sleep mode
- Leadless HVQFN44 package with improved Automated Optical Inspection (AOI) capability
Functional
- Supports autonomous active star operation independent of the host ensuring the TJA1085G remains active even if the host fails or is switched off
- Branches can be independently configured
- Branch extension via TRXD0/1 inner star interface
- 16-bit bidirectional SPI interface up to 2 Mbit/s for host communication
- Full host control over branch status
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Enhanced wake-up capability:
- Remote wake-up via wake-up pattern and dedicated FlexRay data frames
- Local wake-up via pin LWU
- Wake-up source recognition
- configurable per branch
- Enhanced supply voltage monitoring on VIO, VCC, VBUF and VBAT
- Auto I/O level adaptation to host controller supply voltage VIO
- Can be used in 14 V, 24 V and 48 V powered systems
- Enhanced bus error detection - detects short-circuit conditions on the bus
- Instant transmitter shut-down interface (BGE pin)
- Selective branch shut-down (partial networking)
Robustness
- Bus pins protected against ±8 kV ESD pulses according to HBM and ±6 kV ESD pulses according to IEC61000-4-2
- All pins protected against ±1000 V ESD according to CDM
- All pins protected against ±200 V ESD according to MM
- No reverse currents from the digital input pins to VIO or VCC when the TJA1085G is not powered up
- Bus pins short-circuit proof to battery voltage (14 V, 24 V or 48 V) and ground
- Overtemperature detection and protection
- Bus pins protected against transients in automotive environment (according to ISO 7637 class C)
Active Star Functional Classes
- Active star - communication controller interface
- Active star - bus guardian interface
- Active star - voltage regulator control
- Active star - logic level adaptation
- Active star - host interface
- Active star - increased voltage amplitude transmitter
Product Longevity Program
- This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The TJA1085GHN/0Z is included in the 15-year program
Part numbers include: TJA1085GHN.
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Documentation
Quick reference to our documentation types.
3 documents
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Data Sheet
FlexRay active star coupler
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Package Information
plastic thermal enhanced very thin quad flat package; no leads; 44 terminals
