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TJA1086 Datasheet PDF : 62 Pages
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NXP Semiconductors
TJA1086
FlexRay active star coupler
6.5 Communication controller interface
6.5.1 Bus activity and idle detection
The following mechanisms for activity and idle detection are valid in normal power modes:
• If the absolute differential voltage on the bus lines is higher than Vi(dif)det(act) for
tdet(act)(bus), activity is detected on the bus lines
• If, after bus activity detection, the differential voltage on the bus lines is higher than
VIH(dif), pin RXD will go HIGH
• If, after bus activity detection, the differential voltage on the bus lines is lower than
VIL(dif), pin RXD will go LOW
• If the absolute differential voltage on the bus lines is lower than Vi(dif)det(act) for
tdet(idle)(bus), then idle is detected on the bus lines (pin RXD is switched HIGH or
remains HIGH)
Additionally, activity and idle can be detected:
• if pin TXEN is LOW for longer than tdet(act)(TXEN), activity is detected on pin TXEN
• if pin TXEN is HIGH for longer than tdet(idle)(TXEN), idle is detected on pin TXEN
• if pin TRXD0 or TRXD1 is LOW for longer than tdet(act)(TRXD), activity is detected on the
TRXD0/1 interface
• if pins TRXD0 and TRXD1 are both HIGH for longer than tdet(idle)(TRXD), idle is
detected on the TRXD0/1 interface
Table 3. Transmitter input signals: TXD, TXEN and BGE[1]
TXD TXEN BGE VIO UV
RXD Bus
detected
TRXD0
TRXD1
Operating mode
X
H
X
no
HIGH idle
high ohmic[2] high ohmic[2] AS_Normal
X
X
L
no
HIGH idle
high ohmic[2] high ohmic[2] AS_Normal
L
L
H
no
LOW DATA_0 LOW
high ohmic[2] AS_Normal
H
L
H
no
HIGH DATA_1 high ohmic[2] LOW
AS_Normal
X
X
X
no
HIGH idle
high ohmic[2] high ohmic[2] AS_Standby,[3] AS_Sleep[3]
X
X
X
yes
LOW idle
high ohmic[2] high ohmic[2] AS_Normal,
AS_Standby,[3] AS_Sleep[3]
X
X
X
X
HIGH float
high ohmic[2] high ohmic[2] AS_PowerOff, AS_Reset
[1] The transmitter is activated by a falling edge on pin TXD while TXEN is LOW and BGE is HIGH.
[2] Internal pull-up resistor (Rpu) to VBUF.
[3] BP and BM biased to GND.
Table 4.
Bus
DATA_0
DATA_1
idle
X
Bus as input
VIO UV RXD
detected
no
LOW
no
HIGH
no
HIGH
no
HIGH
TRXD0
TRXD1
Operating mode
LOW
high ohmic[1]
high ohmic[1]
high ohmic[1]
high ohmic[1]
LOW
high ohmic[1]
high ohmic[1]
AS_Normal
AS_Normal
AS_Normal
AS_Standby, AS_Sleep
TJA1086
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 18 April 2013
© NXP B.V. 2013. All rights reserved.
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