ZHCSQV1C March 2020 – December 2022 TCAN1463-Q1
PRODUCTION DATA
INH_MASK is a logic-level input signal, referenced to VIO, from a CAN FD controller to the TCAN1463-Q1. The INH_MASK input pin can be used to disable and enable the INH function when in Silent mode. This feature can be used to control the power supply to any power-intensive system blocks to avoid powering up the system blocks from low-power mode due to spurious wake-up events. INH_MASK function should not be used if the INH is used to control the power supply to the transceiver or the controller behind the transceiver - using INH_MASK in such a scenario would prevent the device from entering silent mode and enabling the INH function. See Figure 10-2 for an example application schematic for using INH_MASK function.
INH_MASK has a pull-down resistor that forces the INH feature to the enable state upon a cold start. To activate INH_MASK, the transceiver must be in silent mode. Once in silent mode, the INH_MASK pin is pulled high for t > tINH_MASK, disabling INH. The TCAN1463-Q1 latches this value and retains it through VCC and VIO power cycles and state transitions. The latched value is lost if the TCAN1463-Q1 enters an undervoltage fault on VSUP. To enable INH function again, the transceiver must be in Silent mode, and the INH_MASK pin must be pulled low for t > tINH_MASK. See Figure 8-10 and Figure 8-11 for the procedure to use the INH_MASK feature.
The TCAN1463-Q1 reports a change in state of INH_MASK to the system controller by the driving nFAULT low while in silent mode. To use nFAULT=low as an acknowledgment for the change in state of INH_MASK , nFAULT must be high (that is, no pre-existing faults) before initiating the change in state of INH_MASK. A mode transition into normal, standby, go-to-sleep, or sleep mode clears the nFAULT pin.