tja1082 NXP Semiconductors, tja1082 Datasheet - Page 13

• Manufacturer Part Number: tja1082
• Description: Flexray Node Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1082_2
Product data sheet
Fig 10. Minimum bus pattern for bus wake-up via dedicated FlexRay data frame
+1500
The duration of each interruption is 130 ns.
The transition time from DATA_0 to DATA_1 and vice versa is about 20 ns.
The TJA1082 wake-up flag is set on receipt of the following frame payload:
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
1500
0 V
V dif
6.4 Bus error detection
6.5 Fail silent behavior
770
ns
870
ns
130 ns
The TJA1082 detects the following bus errors during transmission:
The bus error flag is not set when a wake-up pattern or a FlexRay Collision Avoidance
Symbol (CAS) is being transmitted or received.
Three mechanisms guarantee the ‘fail silent’ behavior of the TJA1082:
•
•
•
•
•
•
•
•
870
5 s
ns
Short-circuit BP to BM at the ECU connector or on the bus
Short-circuit BP to GND at the ECU connector or on the bus
Short-circuit BM to GND at the ECU connector or on the bus
Short-circuit BP to V
Short-circuit BM to V
The TXEN Clamped flag is set if pin TXEN goes LOW for longer than t
Normal mode; the transmitter is disabled.
The BGE Clamped flag is set if pin BGE goes HIGH for longer than t
Normal mode; no action is taken.
If a loss-of-ground occurs at the transceiver, resulting in the TJA1082 switching to
Power-off mode, no current flows out of the digital input pins (TXD, TXEN, BGE,
STBN, SCLK, SCSN); see
130
870 ns 870 ns
ns
130
ns
Rev. 02.03 — 10 August 2009
5 s
CC
CC
at the ECU connector or on the bus
at the ECU connector or on the bus
Table 3
for details of the behavior of the bus pins.
5 s
FlexRay node transceiver
5 s
© NXP B.V. 2009. All rights reserved.
TJA1082
015aaa097
detCL(BGE)
detCL(TXEN)
wake-up
in
13 of 35
in