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PDF ( 数据手册 , 数据表 ) TJA1086

零件编号 TJA1086
描述 FlexRay active star coupler
制造商 NXP Semiconductors
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TJA1086 数据手册, 描述, 功能
TJA1086
FlexRay active star coupler
Rev. 1 — 18 April 2013
Product data sheet
1. General description
The TJA1086 is a FlexRay active star coupler that connects two branches of a FlexRay
network. The TJA1086 is compliant with the FlexRay electrical physical layer specification
V3.0.1 (see Ref. 1).
Several TJA1085 and TJA1086 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 TJA1086 supports low-power
management by offering bus wake-up capability along with battery supply and voltage
regulator control. The TJA1086 meets industry standards for EMC/ESD performance and
provides enhanced bus error detection, low current consumption and unmatched
asymmetric delay performance.
The TJA1086 also fulfills the JASPAR requirements as defined by the Japanese car
industry.
2. Features and benefits
2.1 General
Compliant with FlexRay Electrical Physicalhttp://www.DataSheet4U.net/ Layer specification V3.0.1.
Fulfills JASPAR requirements
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
2.2 Functional
Supports autonomous active star operation independent of the host ensuring the
TJA1086 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
Enhanced wake-up capability:
Remote wake-up via wake-up pattern and dedicated FlexRay data frames
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TJA1086 pdf, 数据表
NXP Semiconductors
TJA1086
FlexRay active star coupler
Vdif
(mV)
0
-500
< tdet(wake)tot
> tdet(wake)idle
wake-up
> tdet(wake)idle
> tdet(wake)DATA_0
> tdet(wake)DATA_0
+500
0
-500
> tdet(wake)idle
> tdet(wake)idle
> tdet(wake)DATA_0
> tdet(wake)DATA_0
wake-up symbol
wake-up symbol
wake-up pattern
015aaa007
Fig 3. Bus wake-up timing
See Ref. 1 for more details of the wake-up mechanism.
6.4.1.2 Bus wake-up via dedicated FlexRay data frame
The TJA1086 detects a wake-up event when a dedicated data frame emulating a valid
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wake-up pattern, as shown in Figure 4, is received.
The Data_0 and Data_1 phases of the emulated wake-up symbol are interrupted by the
Byte Start Sequence (BSS) preceding each byte in the data frame. With a data rate of
10 Mbit/s, the interruption has a maximum duration of 130 ns and does not prevent the
transceiver from recognizing the wake-up pattern in the payload.
For longer interruptions at lower data rates (5 Mbit/s and 2.5 Mbit/s), the wake-up pattern
should be used (see Section 6.4.1.1).
TJA1086
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 18 April 2013
© NXP B.V. 2013. All rights reserved.
8 of 62
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TJA1086 equivalent, schematic
NXP Semiconductors
TJA1086
FlexRay active star coupler
6.9 Branch operating modes
Each of the two branches in the TJA1086 features six branch operating modes:
Branch_Off
Both branches are in Branch_Off mode when the TJA1086 is in AS_PowerOff or
AS_Reset mode. The transmitter, normal receiver, low-power receiver and bus error
detection are disabled. The bus pins are floating.
Branch_LowPower
Both branches are in Branch_LowPower mode when the TJA1086 is in AS_Standby
or AS_Sleep mode. The transmitter, the normal receiver and bus error detection are
disabled. The low-power receiver is active (i.e. remote wake-up is possible). The bus
pins are biased to ground.
Branch_Disabled
The TJA1086 switches to Branch_Disabled if an overtemperature is detected. The
‘Branch_Disabled’ and ‘Branch_Normal’ commands allow the host to enable/disable a
branch without affecting the other branch. The transmitter, normal receiver and bus
error detection are disabled. Only the low-power receiver is active (remote wake-up is
possible). The bus pins are biased to Vo(idle)(BP) and Vo(idle)(BM).
Branch_Normal
When a branch is in Branch_Normal, the TJA1086 will be in AS_Normal. The
transmitter, normal receiver and bus error detection are active. The bus pins are
biased to Vo(idle)(BP) and Vo(idle)(BM).
Branch_TxOnly1
In Branch_TxOnly1 mode, the receiver is disabled, i.e. the received data is not
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forwarded to the signal router. The transmitter is active and bus error detection is
active. The bus pins are biased to Vo(idle)(BP) and Vo(idle)(BM).
Branch_TxOnly2
This mode is host-controlled only and is operationally identical to Branch_TxOnly1. It
allows the host to switch off the receiver in response to error conditions.
Branch_FailSilent
The transmitter, the low-power receiver and bus error detection are disabled. Only the
receiver remains active to monitor the branch for idle or activity. Received data is not
forwarded to the signal router. The bus pins are biased to Vo(idle)(BP) and Vo(idle)(BM).
6.9.1 Branch operating mode transitions
Branch-related host commands can only be issued when the TJA1086 is in AS_Normal
mode.
6.9.1.1 Branch_Off
When the TJA1086 enters AS_PowerOff or AS_Reset, both branches switch to
Branch-Off. When the TJA1086 subsequently switches to AS_Standby, both branches
switch to Branch_LowPower.
6.9.1.2 Branch_LowPower
Both branches switch to Branch_LowPower when the TJA1086 enters AS_Standby or
AS_Sleep. Both branches will remain in this mode until the TJA1086 enters AS_Normal.
When this transition happens, any branch that was in Branch_Disabled before switching
to Branch_LowPower will return to Branch_Disabled. Otherwise, both branches switch to
TJA1086
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 18 April 2013
© NXP B.V. 2013. All rights reserved.
16 of 62
datasheet pdf - http://www.DataSheet4U.net/










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