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HVDA5405QDRQ1 Datasheet(PDF) 6 Page - Texas Instruments |
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HVDA5405QDRQ1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 27 page SN65HVDA540-Q1, SN65HVDA541-Q1, SN65HVDA542-Q1 SN65HVDA540-5-Q1, SN65HVDA541-5-Q1, SN65HVDA542-5-Q1 SLLS804C – MARCH 2009 – REVISED JANUARY 2013 www.ti.com Protection Features TXD Dominant State Time Out During normal mode, the only mode where the CAN driver is active, the TXD dominant time out circuit prevents the transceiver from blocking network communication in event of a hardware or software failure where TXD is held dominant longer than the time out period t(DOM). The dominant time out circuit is triggered by a falling edge on TXD. If no rising edge is seen before the time out constant of the circuit expires (t(DOM)) the CAN bus driver is disabled freeing the bus for communication between other network nodes. The CAN driver is re-activated when a recessive signal is seen on TXD pin, thus clearing the dominant state time out. The CAN bus pins will be biased to recessive level during a TXD dominant state time out. 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 CAN protocol allows a maximum of eleven successive dominant bits (on TXD) for the worst case, where five successive dominant bits are followed immediately by an error frame. This, along with the t(DOM) minimum, limits the minimum bit rate. The minimum bit rate may be calculated by: Minimum Bit Rate = 11/t(DOM) Thermal Shutdown If the junction temperature of the device exceeds the thermal shut down threshold the device will turn off the CAN driver circuits. This condition is cleared once the temperature drops below the thermal shut down temperature of the device. The CAN bus pins will be biased to recessive level during a thermal shutdown. Undervoltage Lockout / Unpowered Device Both of the supply pins have undervoltage detection which place the device in forced standby mode to protect the bus during an undervoltage event on either the VCC or VIO supply pins. If VIO is undervoltage the RXD pin is tri-stated and the device does not pass any wake-up signals from the bus to the RXD pin. Since the device is placed into forced standby mode the CAN bus pins have a common mode bias to ground protecting the CAN network, see Figure 1 and Figure 2. The device is designed to be an "ideal passive" load to the CAN bus if it is unpowered. The bus pins (CANH, CANL) have extremely low leakage currents when the device is un-powered so they will not load down the bus but rather be "no load". This is critical, especially if some nodes of the network will be unpowered while the rest of the network remains in operation. APPLICATION NOTE: Once an undervoltage condition is cleared and the VCC and VIO have returned to valid levels the device will typically need 300 µs to transition to normal operation. Table 4. Undervoltage Protection DEVICE VCC VIO DEVICE STATE BUS RXD Common mode SN65HVDA540 Forced Standby Mode HIGH (Recessive) bias to GND(1) Common mode Mirrors bus state via wake-up SN65HVDA541 Bad Good Forced Standby Mode bias to GND(1) filter(2) Common mode SN65HVDA542 Forced Standby Mode HIGH (Recessive) bias to GND(1) Common mode SN65HVDA54x Good Bad Forced Standby Mode(3) tri-state bias to GND(1) Common mode SN65HVDA54x-5 Bad N/A Forced Standby Mode HIGH (Recessive) or tri-state bias to GND(1) All Devices Unpowered Unpowered No Load High Z (1) See Figure 1 and Figure 2 for common mode bias information. (2) See Figure 3 and Figure 4 for operation of the low power wake up receiver and bus monitor for RXD Wake Up Request behavior and Table 3 for the wake up receiver threshold levels. (3) When VIO is undervoltage, the device is forced into standby mode with respect to the CAN bus since there is not a valid digital reference to determine the digital I/O states or power the wake-up receiver. 6 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: SN65HVDA540-Q1 SN65HVDA541-Q1 SN65HVDA540-5-Q1 SN65HVDA541-5-Q1 SN65HVDA542-5-Q1 |
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