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TCAN3413 Datasheet(PDF) 22 Page - Texas Instruments |
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TCAN3413 Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 45 page  reception of the second filtered dominant the bus monitor recognizes the WUP and drives the RXD output low every time an additional filtered dominant signal is received from the bus. For a dominant or recessive to be considered filtered, the bus must be in that state for more than the tWK_FILTER time. Due to variability in tWK_FILTER the following scenarios are applicable. Bus state times less than tWK_FILTER(MIN) are never detected as part of a WUP and thus no wake request is generated. Bus state times between tWK_FILTER(MIN) and tWK_FILTER(MAX) may be detected as part of a WUP and a wake-up request may be generated. Bus state times greater than tWK_FILTER(MAX) are always detected as part of a WUP; therefore, a wake request is always generated. See Figure 7-5 for the timing diagram of the wake-up pattern. The pattern and tWK_FILTER time used for the WUP prevents noise and bus stuck dominant faults from causing false wake-up requests while allowing any valid message to initiate a wake-up request. The ISO 11898-2:2016 standard has defined times for a short and long wake-up filter time. The tWK_FILTER timing for the device has been picked to be within the minimum and maximum values of both filter ranges. This timing has been chosen such that a single bit time at 500 kbps, or two back-to-back bit times at 1 Mbps triggers the filter in either bus state. Any CAN frame at 500 kbps or less would contain a valid WUP. For an additional layer of robustness and to prevent false wake-ups, the device implements a wake-up timeout feature. For a remote wake-up event to successfully occur, the entire WUP must be received within the timeout value t ≤ tWK_TIMEOUT. If not, the internal logic is reset and the transceiver remains in its current state without waking up. The full pattern must then be transmitted again, conforming to the constraints mentioned in this section. See Figure 7-5 for the timing diagram of the wake-up pattern with wake timeout feature. Bus VDiff • tWK_FILTER • tWK_FILTER • tWK_FILTER Bus Filtered Dominant Filtered Dominant Filtered Recessive Wake Up Pattern (WUP) received in t < tWK_Timeout RXD • tWK_FILTER Filtered Dominant RXD Output Bus Wake Via RXD Requests Bus Wake via RXD Request Waiting for Filtered Recessive Waiting for Filtered Dominant Figure 7-5. Wake-Up Pattern (WUP) with tWK_TIMEOUT 7.4.4 Shutdown Mode This is the lowest power state of TCAN3414. All internal blocks including CAN driver, main receiver and low power wake-up receiver are switched off and bi-directional CAN communication is not possible. Wakeup over CAN bus is also not possible in this mode. CAN bus pins are weakly biased towards GND and RXD is high in this state, TCAN3413, TCAN3414 SLLSFS8A – MARCH 2023 – REVISED NOVEMBER 2023 www.ti.com 22 Submit Document Feedback Copyright © 2023 Texas Instruments Incorporated Product Folder Links: TCAN3413 TCAN3414 |
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