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HVDA5405QDRQ1 Datasheet(PDF) 4 Page - Texas Instruments |
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HVDA5405QDRQ1 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 27 page STB RXD Bus V Diff Standby Mode, STB = High <t Clear <t BUS t BUS t BUS t Clear t BUS t BUS STB Bus V Diff RXD Standby Mode, STB = High <t BUS <t BUS <t BUS t BUS t BUS SN65HVDA540-Q1, SN65HVDA541-Q1, SN65HVDA542-Q1 SN65HVDA540-5-Q1, SN65HVDA541-5-Q1, SN65HVDA542-5-Q1 SLLS804C – MARCH 2009 – REVISED JANUARY 2013 www.ti.com Standby Mode (SN65HVDA540) This is the low power mode of the device. It is selected by setting STB high. The CAN driver and receiver are turned off and bi-directional CAN communication is not possible. There is no wake up capability in the SN65HVDA540, the RXD pin will remain recessive (high) while the device is in standby mode. This state is supplied via the VIO supply, thus the VCC (5V) supply may be turned off for additional power savings at the system level. The local protocol controller (MCU) should reactivate the device to normal mode to enable communication via the CAN bus. The 5 V (VCC) supply needs to be reactivated by the local protocol controller to resume normal mode if it has been turned off for low-power standby operation. The CAN bus pins are weakly pulled to GND, see Figure 1 and Figure 2. Standby Mode with RXD Wake Up-Request (SN65HVDA541) This is the low power mode of the device. It is selected by setting STB high. The CAN driver and main receiver are turned off and bi-directional CAN communication is not possible. The low power receiver and bus monitor, both supplied via the VIO supply, are enabled to allow for RXD wake up requests via the CAN bus. The VCC (5V) supply may be turned off for additional power savings at the system level. A wake up request will be output to RXD (driven low) for any dominant bus transmissions longer than the filter time tBUS. The local protocol controller (MCU) should monitor RXD for transitions and then reactivate the device to normal mode based on the wake up request. The 5 V (VCC) supply needs to be reactivated by the local protocol controller to resume normal mode if it has been turned off for low-power standby operation. The CAN bus pins are weakly pulled to GND, see Figure 1 and Figure 2. RXD Wake Up Request Lock Out for Bus Stuck Dominant Fault (SN65HVDA541) If the bus has a fault condition where it is stuck dominant while the SN65HVDA541 is placed into standby mode via the STB pin, the device locks out the RXD wake up request until the fault has been removed to prevent false wake up signals in the system. Figure 3. SN65HVDA541 RXD Wake Up Request With No Bus Fault Condition Figure 4. SN65HVDA541 RXD Wake Up Request Lock Out When Bus Dominant Fault Condition Silent (Receive Only) Mode (SN65HVDA542) This is the silent (receive only) mode of the device. It is selected by setting S high. The CAN driver is turned off while the receiver remains active and RXD will output the received bus state. There is no low power mode in the SN65HVDA542 except for VCC and VIO supply undervoltage conditions (see Undervoltage Lockout / Unpowered Device section of the datasheet). 4 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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