TJA1083G All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
Product data sheet Rev. 1 — 18 January 2018 12 of 41
NXP Semiconductors
TJA1083G
FlexRay node transceiver
6.4 Bus error detection
The TJA1083G detects the following bus errors during transmission:
• 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
CC
at the ECU connector or on the bus
• Short-circuit BM to V
CC
at the ECU connector or on the bus
The bus error flag is not set when a wake-up pattern or a FlexRay Collision Avoidance
Symbol (CAS) is being transmitted or received.
6.5 Fail silent behavior
Three mechanisms guarantee the ‘fail silent’ behavior of the TJA1083G:
• The TXEN clamped flag is set if pin TXEN goes LOW for longer than t
detCL(TXEN)
in
Normal mode; the transmitter is disabled.
• The BGE clamped flag is set if pin BGE goes HIGH for longer than t
detCL(BGE)
in
Normal mode; no action is taken.
• If a loss-of-ground occurs at the transceiver, resulting in the TJA1083G switching to
Power-off mode, no current flows out of the digital input pins (TXD, TXEN, BGE,
STBN, SCLK, SCSN); see Table 3
for details of the behavior of the bus pins.
6.6 TJA1083G flags
The TJA1083G has 11 status/error flags, described in Table 7.
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 TJA1083G 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
Fig 9. Minimum bus pattern for bus wake-up via dedicated FlexRay data frame
015aaa139
V
dif
0 V
-2000
wake-up
+2000
870
ns
870
ns
870 ns 870 ns
770
ns
130 ns
130
ns
130
ns
5 µs
5 µs 5 µs 5 µs
