TJA1080 查看數據表（PDF） - Philips Electronics
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TJA1080 Datasheet PDF : 44 Pages
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Philips Semiconductors
TJA1080
FlexRay transceiver
7.1.3 Bus activity and idle detection
The following mechanisms for activity and idle detection are valid for node and star
configurations in normal power modes:
• If the absolute differential voltage on the bus lines is higher than Vi(dif)det(act) for
tdet(act)(bus), then activity is detected on the bus lines and pin RXEN is switched to LOW
which results in pin RXD being released
• 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 and pin RXEN is switched to HIGH.
This results in pin RXD being blocked (pin RXD is switched to HIGH or stays HIGH)
Additionally, in star configuration, 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
pins TRXD0 and TRXD1
• If pin TRXD0 or TRXD1 is HIGH for longer than tdet(idle)(TRXD), idle is detected on pins
TRXD0 and TRXD1
7.2 Operating modes in node configuration
The TJA1080 provides two control pins STBN and EN in order to select one of the modes
of operation in node configuration. See Table 4 for a detailed description of the pin
signalling in node configuration, and Figure 3 for the timing diagram.
All modes are directly controlled via pins EN and STBN unless an undervoltage situation
is present.
If VIO and (VBUF or VBAT) are within their operating range, pin ERRN indicates the error
flag.
Table 4.
Pin
STBN
EN
ERRN
RXEN
RXD
Pin signalling in node configuration
Mode
Normal
Receive only
HIGH
HIGH
HIGH
LOW
LOW: error flag set [3]
HIGH: error flag set[3] [4]
LOW: bus activity
HIGH: bus idle
LOW: bus DATA_0
HIGH: bus DATA_1 or idle
Go-to-sleep
Standby
LOW
LOW
HIGH
LOW
LOW: wake flag set [4]
HIGH: wake flag reset [4]
LOW: wake flag set [4]
HIGH: wake flag reset [4]
LOW: wake flag set [4]
HIGH: wake flag reset [4]
Sleep
LOW
X
TJA1080_1
Preliminary data sheet
Rev. 01 — 20 July 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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