tja1082 NXP Semiconductors, tja1082 Datasheet - Page 14

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

NXP Semiconductors
Table 7.
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
TJA1082_2
Product data sheet
Flag name Flag type Flag description
bus wake
Normal
mode
transmitter
enabled
BGE
clamped
PWON
bus error
TEMP
HIGH
TXEN
clamped
UVV
UVV
SPI error
All flags, with the exception of the PWON flag, are reset after a power-on reset.
If an undervoltage has not been detected on pin V
If STBN = LOW.
If BGE = HIGH, the Normal mode flag is set, the TEMP HIGH flag is not set and the TXEN clamped flag is not set.
Flag can only be set or reset in Normal mode or on leaving Normal mode.
If STBN = HIGH.
If STBN = HIGH in SPI mode
The SPI error flag is set when:
a) more than 16 falling edges occur on pin SCLK while pin SCSN = LOW
b) less than 16 falling edges occur on pin SCLK while pin SCSN = LOW.
CC
IO
TJA1082 flags and set/reset conditions
status
flag
status
flag
status
flag
status
flag
status
flag
error flag indicates if a bus error has
error flag indicates if the max.
error flag indicates if pin TXEN is
error flag indicates if there is an
error flag indicates if there is an
error flag indicates if an SPI error
6.6 TJA1082 flags
6.7 TJA1082 status register
indicates if a wake-up
event has occurred
indicates if the transceiver
is in Normal mode
indicates the transmitter
status
indicates if pin BGE is
clamped
indicates when the digital
section is initialized
been detected
junction temperature has
been reached
clamped
undervoltage at pin V
undervoltage at pin V
has occurred
The TJA1082 has 11 status/error flags. These are described in
The TJA1082 contains a 16-bit status register, of which bits S0 to S4 reflect the state of
the status flags, bits S5 to S10 reflect the state of the error flags and bit S15 is a parity bit.
All flags can be individually read out on pin SDO via a 16-bit SPI interface when the
transceiver is configured in SPI mode. The status register bits are described in
CC
IO
Rev. 02.03 — 10 August 2009
CC
.
Set condition
wake-up event on bus
in Standby mode
entering Normal mode
transmitter enabled
BGE HIGH for longer
than t
V
bus error detected
T
TXEN LOW for longer
than t
V
longer than t
V
than t
SPI error detected
vj
CC
CC
IO
> T
< V
> V
< V
detCL(BGE)
detCL(TXEN)
det(uv)(VIO)
j(dis)(high)
uvr(VIO)
th(rec)POR
uvr(VCC)
det(uv)(VCC)
for longer
[5]
[5]
for
[5]
[2]
[5]
[8]
[4]
Reset condition
transition to Normal
mode
leaving Normal mode
transmitter disabled
BGE LOW
transition to Normal
mode
no bus error detected or
positive edge on
TXEN
TXEN = HIGH while
T
TXEN = HIGH
V
longer than t
V
longer than t
falling edge on SCSN
vj
CC
IO
< T
> V
> V
[5]
j(dis)(high)
uvd(VIO)
uvd(VCC)
[5]
rec(uv)(VCC)
rec(uv)(VIO)
[5]
[5]
for
FlexRay node transceiver
for
[1]
Table
7.
Consequence of
flag set
RXD
ERRN
-
-
-
-
ERRN
ERRN
transmitter disabled
ERRN
transmitter disabled
ERRN
entering Standby
mode
ERRN
entering Standby
mode
ERRN
SDO goes to a high
impedance state
© NXP B.V. 2009. All rights reserved.
TJA1082
LOW;
Table
LOW
LOW
LOW
LOW
LOW
LOW
LOW
14 of 35
[3]
[6]
[6]
[6]
[6]
[6]
[7]
8.
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