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SN65HVDA100-Q1 Datasheet(PDF) 8 Page - Texas Instruments

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Part # SN65HVDA100-Q1
Description  LIN PHYSICAL INTERFACE
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN65HVDA100-Q1 Datasheet(HTML) 8 Page - Texas Instruments

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background image
NWake
INH
High impedance
EN
RXD
Floating
TXD
MODE
Sleep
Normal
LIN
V
SUP
t < t
NW ke
a
NW
L
ake V
I
NWake V
IH
NWake V
IL
t
Wa e
N
k
Standby
Weak internal pulldown
V
SUP
V
SUP
Wake-up source recognition:
Strong pulldown
SN65HVDA100-Q1
SLIS128
– NOVEMBER 2011
www.ti.com
Figure 5. Wake-Up Via NWake
PROTECTION AND FAILSAFE FEATURES
TXD Dominant State Timeout
During normal mode, if TXD is inadvertently driven permanently low by a hardware or software application
failure, the LIN bus is protected by the dominant state timeout timer. This timer is triggered by a falling edge on
TXD. If the low signal remains on TXD for longer than tDST, the transmitter is disabled, thus allowing the LIN bus
to return to the recessive state and communication to resume on the bus. The protection is cleared and the tDST
timer is reset by a rising edge on TXD. The TXD pin has an internal pulldown to ensure the device fails to a
known state if TXD is disconnected. During this fault, the transceiver remains in normal mode (assuming no
change of state request on EN), the transmitter is disabled, the RXD pin reflects the LIN bus, INH remains on,
and the LIN bus pullup termination remains on.
APPLICATION NOTE: The maximum dominant TXD time allowed by the TXD Dominant state time out limits
the minimum possible data rate of the device. The LIN protocol has differenct constraints for master and
slave applications thus there are different the maximum consecutive dominant bits for each application case
and thus different minimum data rates.
Master node: The maximum continuous dominant is the maximum dominant of the SYNC BREAK
FIELD, tSYNC_DOM(max). The SYN BREAK FIELD notifies the 'start of frame' to all LIN slaves. It consists of
13 to 26 dominant bits (low phase) followed by a delimiter. Thus the minimum TXD dominant time out,
tDST(min) and the maximum SYNC BREAK FIELD for the master determine the minimum data rate for a
master node, which may be calculated by the following equation:
DataRateMaster(min) = tSYNC_DOM(max) / tDST(min)
Slave node: sends the response part of the LIN message frame which has a maximum consecutive
dominant length of 9 bits (start bit + 8 data bits). As a result the minimum baud rate of a slave can be
calculated by the following equation:
DataRateSlave(min) = 9 + nmargin / tDST(min) where nmargin is a saftey margin.
8
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© 2011, Texas Instruments Incorporated


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