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TPIC1021AQDRQ1 Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza TPIC1021AQDRQ1
Descripción Electrónicos  LIN PHYSICAL INTERFACE
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Fabricante Electrónico  TI1 [Texas Instruments]
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TPIC1021AQDRQ1 Datasheet(HTML) 6 Page - Texas Instruments

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Wake-Up Events
Standby Mode
INH
High Impedance
TXD
MODE
Sleep
Normal
EN
RXD
Floating
LIN
t > tgo_to_operate
Vsup
Vsup
TPIC1021A-Q1
SLIS117A – AUGUST 2007 – REVISED JUNE 2009.......................................................................................................................................................... www.ti.com
While the device is in sleep mode, the following conditions exist:
• The LIN bus driver is disabled and the internal LIN bus termination is switched off (to minimize power loss if
LIN is short circuited to ground). However, the weak current pullup is active to prevent false wake-up events
in case an external connection to the LIN bus is lost.
• The normal receiver is disabled.
• INH is high impedance.
• EN input, NWake input, and the LIN wake-up receiver are active.
There are three ways to wake up the TPIC1021A from sleep mode:
• Remote wake-up via recessive (high) to dominant (low) state transition on LIN bus. The dominant state must
be held for tLINBUS filter time and then the bus must return to the recessive state (to eliminate false wake-ups
from disturbances on the LIN bus or if the bus is shorted to ground).
• Local wake-up via a low on NWake, which is asserted low longer than the filter time t
NWake (to eliminate false
wake-ups from disturbances on NWake)
• Local wake-up via EN being set high
This mode is entered whenever a wake-up event occurs via LIN bus or NWake while the TPIC1021A is in sleep
mode. The LIN bus slave termination circuit and INH are turned on when standby mode is entered. The
application system powers up once INH is turned on, assuming the system is using a voltage regulator
connected via INH. Standby mode is signaled via a low level on RXD.
When EN is set high while the TPIC1021A is in standby mode the device returns to normal mode and the normal
transmission paths from TXD to LIN bus and LIN bus to RXD are enabled.
Figure 2. Wake-Up Via EN
6
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Product Folder Link(s): TPIC1021A-Q1


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