TJA1085HN   NXP

2.1 General

Compliant with FlexRay Electrical Ph
ysical Layer specification V3.0.1.

Fulfills JASPAR requirements

Automotive product qualificatio
n 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
2.2 Functional

Supports autonomous active star operation independent of the host ensuring the
TJA1085 remains active even if t
he 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

Enhanced wake-up capability:

Remote wake-up via wake-up pattern and dedicated FlexRay data frames
TJA1085
FlexRay active star coupler
Rev. 1 — 23 October 2012
Product data sheet

 

TJA1085
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 23 October 2012
2 of 61
NXP Semiconductors
TJA1085
FlexRay active star coupler

Local wake-up via pin LWU

Wake-up source recognition

configurable per branch

Enhanced supply voltage monitoring on V
IO
, V
CC
, V
BUF
and V
BAT

Auto I/O level adaptation to host controller supply voltage V
IO

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)
2.3 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 V
IO
or V
CC
when the TJA1085 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)
2.4 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 vo
ltage amplitude transmitter