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부품번호 TJA1085 기능
기능 FlexRay active star coupler
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TJA1085 데이터시트, 핀배열, 회로
TJA1085
FlexRay active star coupler
Rev. 1 — 23 October 2012
Product data sheet
1. General description
The TJA1085 is a FlexRay active star coupler that can connect up to 4 branches of a
FlexRay network. The TJA1085 is compliant with the FlexRay electrical physical layer
specification V3.0.1 (see Ref. 1).
Several TJA1085 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 TJA1085 supports low-power management by
offering bus wake-up capability along with battery supply and voltage regulator control.
The TJA1085 meets industry standards for EMC/ESD performance and provides
enhanced bus error detection, low current consumption and unmatched asymmetric delay
performance.
The TJA1085 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
TJA1085 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/




TJA1085 pdf, 반도체, 판매, 대치품
NXP Semiconductors
5. Pinning information
5.1 Pinning
TJA1085
FlexRay active star coupler
SCSN 1
SCLK 2
SDI 3
SDO 4
INTN 5
GNDD 6
VIO 7
BGE 8
TXD 9
TXEN 10
RXD 11
TJA1085
33 BP_1
32 BM_1
31 n.c.
30 BP_2
29 BM_2
28 n.c.
27 BP_3
26 BM_3
25 n.c.
24 BP_4
23 BM_4
Fig 2. Pin configuration
Transparent top view
http://www.DataSheet4U.net/
015aaa150
5.2 Pin description
Table 2. Pin description
Symbol Pin
Type[1] Description
SCSN 1
I
SPI chip select input; internal pull-up
SCLK 2
I
SPI clock signal; internal pull-down
SDI 3
I
SPI data input; internal pull-down
SDO 4
O SPI data output; 3-state output
INTN 5
O interrupt output; open-drain output, low-side driver
GNDD 6
G ground for digital circuits[2]
VIO 7 P supply voltage for VIO voltage level adaptation
BGE 8
I
bus guardian enable input; internal pull-down
TXD 9
I
transmit data input; internal pull-down
TXEN 10
I
transmitter enable input; internal pull-up
RXD 11
O
receive data output
TRXD0 12 IO data bus line 0 for inner star connection
TRXD1 13 IO data bus line 1 for inner star connection
n.c. 14
-
not connected; to be connected to GND in application
INH 15
O
inhibit output; for switching external voltage regulator
TJA1085
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 October 2012
© NXP B.V. 2012. All rights reserved.
4 of 61
datasheet pdf - http://www.DataSheet4U.net/

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TJA1085 전자부품, 판매, 대치품
NXP Semiconductors
TJA1085
FlexRay active star coupler
6.4 Wake-up
The TJA1085 supports the following wake-up mechanisms:
Remote wake-up via the bus (wake-up pattern or dedicated wake-up frame)
Local wake-up via pin LWU
Activity on the inner star interface (pins TRXD0 and TRXD1)
Any wake-up event will generate a WU interrupt. A remote wake-up on a branch will
generate an EVENT_BRx interrupt to indicate the branch where the wake-up pattern or
dedicated data frame was detected.
The host can identify the wake-up source by polling the General Status register
(WU_TRXD = 1 for a TRXD0/1 wake-up; WU_LOCAL = 1 for a local wake-up) and the
Branch Status register (WU_BRx = 1 for a remote wake-up).
6.4.1 Remote wake-up
When the TJA1085 is in AS_Standby or AS_Sleep, all branches are monitored for
wake-up events. When a valid wake-up pattern or data frame is detected on a branch, the
relevant WU_BRx status bit is set and the wake-up pattern/data frame is forwarded to all
other enabled branches.
A remote wake-up event occurring during an AS_Normal-to-AS_Standby or
AS_Normal-to-AS_Sleep transition will also be detected, setting the relevant WU_BRx
status bit and generating WU and EVENT_BRx interrupts.
6.4.1.1 Bus wake-up via wake-up patternhttp://www.DataSheet4U.net/
A wake-up pattern consists of at least two consecutive wake-up symbols. A wake-up
symbol consists of a DATA_0 phase lasting longer than tdet(wake)DATA_0, followed by an idle
phase lasting longer than tdet(wake)idle, provided both wake-up symbols occur within a time
span of tdet(wake)tot (see Figure 3). The transceiver also wakes up if the idle phases are
replaced by DATA_1 phases.
A wake-up event is not detected if an invalid wake-up pattern is received. See Ref. 1 for
more details on invalid wake-up patterns.
TJA1085
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 October 2012
© NXP B.V. 2012. All rights reserved.
7 of 61
datasheet pdf - http://www.DataSheet4U.net/

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