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TJA1080ATS/2/T,118

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P49
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TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 13 of 49
NXP Semiconductors
TJA1080A
FlexRay transceiver
[1] Recovery of UV
VCC
flag.
[2] Recovery of UV
VBAT
flag.
[3] Clearing the UV
VBAT
flag sets the wake flag. In the case of a transition to Normal mode the wake flag is immediately cleared.
[4] Recovery of UV
VIO
flag.
Table 7. State transitions forced by an undervoltage recovery (node configuration)
indicates the action that initiates a transaction;
1 and
2 are the consequences of a transaction.
Transition
from mode
Direction to
mode
Transition
number
Pin Flag Note
STBN EN UV
VIO
UV
VBAT
UV
VCC
PWON Wake
Standby Normal 38 H H cleared cleared cleared X X
[1]
Receive-only 39 H L cleared cleared cleared X X
[1]
Sleep Normal 40 H H cleared cleared cleared X 1 cleared
[2][3]
Normal 41 H H cleared cleared cleared X X
[4]
Receive-only 42 H L cleared cleared cleared X 1 set
[2][3]
Receive-only 43 H L cleared cleared cleared X X
[4]
Standby 44 L L cleared cleared cleared X 1 set
[2][3]
Sleep 45 L X cleared cleared cleared X cleared
[4]
Go-to-sleep 46 L H cleared cleared cleared X 1 set
[2][3]
Sleep 47 L X cleared cleared cleared X cleared
[4]
TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 14 of 49
NXP Semiconductors
TJA1080A
FlexRay transceiver
6.2.1 Normal mode
In Normal mode the transceiver is able to transmit and receive data via the bus lines BP
and BM. The output of the normal receiver is directly connected to pin RXD.
The transmitter behavior in Normal mode of operation, with no time-out present on pins
TXEN and BGE and the temperature flag not set, is given in Table 8
.
In this mode pins INH1 and INH2 are set HIGH.
6.2.2 Receive-only mode
In Receive-only mode the transceiver can only receive data. The transmitter is disabled,
regardless of the voltages on pins BGE and TXEN.
In this mode pins INH1 and INH2 are set HIGH.
6.2.3 Standby mode
In Standby mode the transceiver has entered a low power mode which means very low
current consumption. In the Standby mode the device is not able to transmit or receive
data and the low power receiver is activated to monitor for bus wake-up patterns.
Standby mode can be entered if the correct polarity is applied to pins EN and STBN (see
Figure 5
and Table 4) or an undervoltage is present on pin V
CC
; see Figure 5.
In this mode, pin INH1 is set HIGH.
If the wake flag is set, pin INH2 is set to HIGH and pins RXEN and RXD are set to LOW,
otherwise pin INH2 is floating and pins RXEN and RXD are set to HIGH; see Section 6.5
.
6.2.4 Go-to-sleep mode
In this mode the transceiver behaves as in Standby mode. If this mode is selected for a
longer time than the go-to-sleep hold time parameter (minimum hold time) and the wake
flag has been previously cleared, the transceiver will enter Sleep mode, regardless of the
voltage on pin EN.
Table 8. Transmitter function table
BGE TXEN TXD Transmitter
L X X transmitter is disabled
X H X transmitter is disabled
H L H transmitter is enabled; the bus lines are actively driven; BP is driven
HIGH and BM is driven LOW
H L L transmitter is enabled; the bus lines are actively driven; BP is driven
LOW and BM is driven HIGH
TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 15 of 49
NXP Semiconductors
TJA1080A
FlexRay transceiver
6.2.5 Sleep mode
In Sleep mode the transceiver has entered a low power mode. The only difference with
Standby mode is that pin INH1 is also set floating. Sleep mode is also entered if the UV
VIO
or UV
VBAT
flag is set.
In case of an undervoltage on pin V
CC
or V
BAT
while V
IO
is present, the wake flag is set by
a positive edge on pin STBN.
The undervoltage flags will be reset by setting the wake flag, and therefore the transceiver
will enter the mode indicated on pins EN and STBN if V
IO
is present.
A detailed description of the wake-up mechanism is given in Section 6.5
.
6.3 Operating modes in star configuration
In star configuration mode control via pins EN and STBN is not possible. The transceiver
autonomously controls the operating modes except in the case of wake-up.
The timing diagram of a transceiver configured in star configuration is illustrated in
Figure 7
. The state diagram in star configuration is illustrated in Figure 6. A detailed
description of the pin signalling in star configuration is given in Table 9
.
If V
IO
and (V
BUF
or V
BAT
) are within their operating ranges, pin ERRN indicates the status
of the error flag. Operating ranges are: V
BAT
= 6.5 V to 60 V, V
CC
= 4.75 V to 5.25 V,
V
BUF
= 4.75 V to 5.25 V and V
IO
= 2.2 V to 5.25 V.
[1] Pin ERRN provides a serial interface for retrieving diagnostic information.
[2] TRXD lines switched as output if TXEN activity is the initiator for Star-transmit mode.
[3] TRXD lines are switched as input if TRXD activity is the initiator for Star-transmit mode.
[4] Valid if V
IO
and (V
BUF
or V
BAT
) are present.
Pin BGE must be HIGH in order to enable the transmitter via pin TXEN. If pin BGE is
LOW, it is not possible to activate the transmitter via pin TXEN. If pin TXEN is not used (no
controller connected to the transceiver), it has to be connected to pin GND in order to
prevent TXEN activity detection.
In all normal modes pin RXD is connected to the output of the normal mode receiver and
therefore represents the data on the bus lines.
Table 9. Pin signalling in star configuration
Mode TRXD0 /
TRXD1
ERRN
[1]
RXEN RXD Transmitter INH1 INH2
LOW HIGH LOW HIGH LOW HIGH
Star-transmit output
[2]
input
[3]
error flag
set
error flag
reset
bus
activity
bus idle bus
DATA_0
bus
DATA_1
or idle
enabled HIGH HIGH
Star-receive output disabled
Star-idle input
Star-locked input
Star-standby input error flag
set
[4]
error flag
reset
wake flag
set
[4]
wake flag
reset
wake flag
set
[4]
wake flag
reset
Star-sleep input float float
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TJA1080ATS/2/T,118

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Manufacturer:
NXP Semiconductors
Description:
Interface - Specialized FLEXRAY TRANSCEIVER
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