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L9300 Datasheet(PDF) 94 Page - STMicroelectronics |
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L9300 Datasheet(HTML) 94 Page - STMicroelectronics |
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94 / 182 page  15.1.2 Wakeup (from CAN) When the device is in standby mode, with CAN wake up option enabled, the CAN bus traffic is detected. For the wake up feature the device logic differentiates different conditions. When the device is in standby mode, with CAN wake up option enabled, the CAN bus traffic is detected. For the wake up feature the device logic differentiates between the following conditions. Normal pattern wakeup Normal pattern wakeup can occur when CAN pattern wakeup option is enabled and the CAN transceiver was set in standby mode while CAN bus was in recessive (high) state or dominant (low) state. In order to wake up the device, the following criteria must be fulfilled: • The CAN interface wakeup receiver must receive a series of two consecutive valid dominant pulses, each of which must be longer than 2 µs • The distance between 2 pulses must be longer than 2 µs. • The two pulses must occur within a time frame of 1.0 ms Wake up from short to GND condition Even if CAN pattern wake up option is enabled, but the CAN transceiver was set in standby mode after a qualified permanent dominant state, recessive level at CAN switches the device to active mode. No pattern wakeup If the CAN pattern wakeup option is disabled, any transition either dominant (low) state to recessive (high) state or recessive (high) state to dominant (low) state switch the device to active mode (after a filtering time of tWUF). Note: A wakeup caused by a message on the bus starts the voltage regulator and the microcontroller switches the application back to normal operation mode. Figure 60. CAN wake up capabilities No pattern Wake up Pattern Wake up ACTIVE STANDBY ACTIVE CANRX STATE Standard CAN pattern wakeup ACTIVE STANDBY ACTIVE CANRX STATE CAN pattern wake up with dominant before Standby ACTIVE STANDBY ACTIVE CANRX STATE CAN pattern wake up with permanent dominant ACTIVE STANDBY ACTIVE CANRX STATE Standard wakeup ACTIVE STANDBY ACTIVE CANRX STATE dominant filter time CAN wake up with permanent dominant ACTIVE STANDBY ACTIVE CANRX STATE CAN wake up with dominant before Standby RXDL (Interupt) RXDL RXDL RXDL RXDL RXDL > 2 µs < 1ms > 2 µs > 2 µs 56 µs > 2 µs < 1ms > 2 µs > 2 µ s 56 µs 56 µs > 4 µs > permanent > 2 µs 56 µs 56µs (Interupt) (Interupt) (Interupt) > 4 µs > 2 µs > permanent dominant filter time 56 µs (Interupt) (Interupt) GADG0708170943PS L9300 CAN interface functional description DS12258 - Rev 4 page 94/182 |
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