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TPIC1021AQDRQ1 Datasheet(PDF) 6 Page - Texas Instruments |
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TPIC1021AQDRQ1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 20 page 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 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s): TPIC1021A-Q1 |
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