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TCAN3413 Datasheet(PDF) 20 Page - Texas Instruments |
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TCAN3413 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 45 page  fault and the receiver to RXD path remains operational. The TCAN341x TSD circuit includes hysteresis which prevents the CAN driver output from oscillating during a TSD fault. 7.3.6 Undervoltage Lockout The supply pins, VCC and VIO, have undervoltage detection that places the device into a protected state. This protects the bus during an undervoltage event on either supply pin. Table 7-1. Undervoltage Lockout - TCAN3414 VCC DEVICE STATE BUS RXD PIN > UVVCC Normal if STB = GND and SHDN = GND Per TXD Mirrors bus > UVVCC Standby mode if STB = High and SHDN = GND Weak biased to GND VCC, Remote wake request See Remote Wake Request via Wake-Up Pattern (WUP) in Standby Mode > UVVCC Shutdown mode if SHDN = High Weak biased to GND VCC < UVVCC Protected High impedance High impedance Table 7-2. Undervoltage Lockout - TCAN3413 VCC VIO DEVICE STATE BUS RXD PIN > UVVCC > UVVIO Normal Per TXD Mirrors bus < UVVCC > UVVIO STB = High: Standby Mode Weak biased to GND VIO: Remote wake request See Remote Wake Request via Wake-Up Pattern (WUP) in Standby Mode STB =Low: Protected Mode High impedance Recessive > UVVCC < UVVIO Protected High impedance High impedance < UVVCC < UVVIO Protected High impedance High impedance Once the undervoltage condition is cleared and tMODE or tSHDN2 has expired, the TCAN341x transitions to normal mode. The host controller again sends and receives CAN traffic. 7.3.7 Unpowered Device For unpowered conditions, the TCAN341x is designed to be a passive or no load to the CAN bus. This is because the bus pins were designed to have low leakage currents to not load the bus. This design consideration is critical if some nodes of the network are unpowered while the rest of the network remains operational. For unpowered scenario, the logic pins also have low leakage currents so they do not load other circuits which may remain powered. 7.3.8 Floating pins The TCAN341x devices have internal pull-up/pull-down resistors on critical pins which place the device into known states if the pin floats. This internal bias should not be relied upon by design though, especially in noisy environments, but instead should be considered a failsafe protection feature. When a CAN controller supporting open-drain outputs is used, an adequate external pull-up resistor must be chosen. This makes sure the TXD output of the CAN controller maintains acceptable bit time to the input of the CAN transceiver. See Table 7-3 for details on pin bias conditions. TCAN3413, TCAN3414 SLLSFS8A – MARCH 2023 – REVISED NOVEMBER 2023 www.ti.com 20 Submit Document Feedback Copyright © 2023 Texas Instruments Incorporated Product Folder Links: TCAN3413 TCAN3414 |
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