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TJA1086 Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer TJA1086
Beschreibung FlexRay active star coupler
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
TJA1086 Datasheet, Funktion
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
datasheet pdf - http://www.DataSheet4U.net/






TJA1086 Datasheet, Funktion
NXP Semiconductors
TJA1086
FlexRay active star coupler
6. Functional description
6.1 Supply voltage
The TJA1086 state machine is adequately supplied if at least one of VBAT, VCC or VBUF is
available. The internal supply voltage to the state machine is denoted by VDIG. VBUF is an
auxiliary supply and is only needed for forwarding the wake-up pattern when VCC is not
available.
6.2 Host Control (HC) and Autonomous Power (AP) modes - APM flag
The APM flag determines whether the TJA1086 is host-controlled or is operating in
Autonomous Power mode. It is in AP mode by default.
The TJA1086 sets the APM flag:
at power-on
when a wake-up event is detected (on TXRD0/1, local or remote)
when a VCC undervoltage event is detected in AS_Normal mode
when a VIO undervoltage event lasts longer than tto(uvd)(VIO)
The host can set or reset the APM flag at any time.
6.3 Signal router
The signal router transfers data receivedhttp://www.DataSheet4U.net/ on an input channel to all channels configured as
outputs. If data is being received on more than one input channel at the same time, the
channel that was first to signal activity is selected and data on the other channel/s is
ignored. Whether or not the data on an output channel is transmitted depends on whether
the output channel is enabled or disabled.
The TJA1086 contains the following data input channels:
Branches 1 and 2
TRXD0/1 interface (inner star interface)
TXD/TXEN interface
The TJA1086 contains the following data output channels:
Branches 1 and 2
TRXD0/1 interface
RXD pin
6.3.1 TRXD collision
When the TRXD0/1 interface is configured as an output channel, a TRXD collision is
detected (COLL_TRXD = 1) if pins TRXD0 and TRXD1 are both LOW for longer than
tdet(col)(TRXD), generating a CLAMP_ERROR interrupt.
When a TRXD collision is detected, the TJA1086 transmits a DATA_0 to all other active
output channels (irrespective of the actual data on the selected input channel), until the
selected input channel detects idle state.
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.
6 of 62
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6 Page









TJA1086 pdf, datenblatt
NXP Semiconductors
TJA1086
FlexRay active star coupler
The UV_ERROR, CLAMP_ERROR, TEMP_ERROR and EVENT_BRx status bits are
reset after the flag (or flags) that triggered the interrupt has been reset and a successful
read operation had been performed (these two events can occur in any order). Resetting
these bits triggers a further falling edge on INTN to indicate to the host that the issue that
triggered the interrupt has been resolved (except in the case of EVENT_BRx if a branch
wake-up event triggered the interrupt). See Section 6.10.2.3 for further details.
INTN signaling conforms to the FlexRay Electrical Physical Layer specification V3.0.1
(see Ref. 1).
6.8 Operating modes
The TJA1086 features five operating modes.
AS_PowerOff, AS_Sleep and AS_Standby are low-power modes in which the transceiver
is unable to transmit or receive data streams on the bus. In AS_PowerOff mode, only
power-on reset detection is active. The SPI, the low-power receiver and wake-up
detection are active in AS_Sleep mode. Undervoltage detection is enabled on VCC, VBAT
and VBUF in AS_Standby and AS_Normal modes. VIO undervoltage detection is always
enabled, except when the TJA1086 is in AS_PowerOff mode.
In AS_Normal mode, the TJA1086 can transmit and receive data streams on the bus.
Pin INH is HIGH in AS_Normal, AS_Standby and AS_Reset, and floating in AS_PowerOff
and AS_Sleep.
The dStarGoToSleep timer is started when the TJA1086 switches to AS_Standby or
http://www.DataSheet4U.net/
AS_Normal, or when idle is detected on the bus. The timer is halted and reset when
activity is detected on the bus.
6.8.1 Operating mode transitions
6.8.1.1 AS_PowerOff
The TJA1086 switches to AS_PowerOff from any mode if the internal supply to the state
machine, VDIG, falls below the power-on detection threshold voltage (Vth(det)POR). It
remains in AS_PowerOff until VDIG rises above the power-on recovery threshold voltage
(Vth(rec)POR), when it switches to AS_Standby. Pins INTN and SDO are switched to a
high-impedance state in AS_PowerOff mode.
6.8.1.2 AS_Reset
The TJA1086 switches to AS_Reset from any mode if pin RSTN goes LOW with no
undervoltage detected on VIO. It remains in AS_Reset until pin RSTN goes HIGH, when it
switches to AS_Standby.
6.8.1.3 AS_Standby
The TJA1086 switches to AS_Standby:
- from AS_PowerOff when VDIG rises above the power-on recovery threshold voltage
(Vth(rec)POR)
- from AS_Reset when pin RSTN goes HIGH
- from AS_Normal when a VCC undervoltage event is detected (VCC < Vuvd(VCC) for
longer than tdet(uv)(VCC))
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.
12 of 62
datasheet pdf - http://www.DataSheet4U.net/

12 Page





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