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L9779WD 数据表(PDF) 96 Page - STMicroelectronics |
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L9779WD 数据表(HTML) 96 Page - STMicroelectronics |
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96 / 170 page  Functional description L9779WD 96/170 DocID027452 Rev 5 CAN error handling The L9779WD provides the following 4 error handling features that are realized in different stand alone CAN transceivers / micro controllers to switch the application back to normal operation mode. If one of the below fault happens the status bit CAN_ERROR is set. The error handling features can be disabled through the CAN_ERR_DIS bit. 1. Dominant CAN_TX time out If CAN_TX is in dominant state (low) for t > tdom (TxD) the transmitter will be disabled, status bit will be latched and can be read and cleared by MSC. The transmitter remains disabled until the status register is cleared. 2. CAN permanent recessive If CAN_TX changes to dominant (low) state but CAN bus (CAN_RX pin) does not follow for 4 times, the transmitter will be disabled, status bit will be latched and can be read and cleared by MSC. The transmitter remains disabled until the status register is cleared. 3. CAN permanent dominant If the CAN bus state is dominant (low) for t > tCAN a permanent dominant status will be detected. The status bit will be latched and can be read and cleared by MSC. The transmitter will not be disabled. 4. CAN_RX permanent recessive If CAN_RX pin is clamped to recessive (high) state, the controller is not able to recognize a bus dominant state and could start messages at any time, which results in disturbing the overall bus communication. Therefore, if RX_ECHO does not follow CAN_TX for 4 times the transmitter will be disabled. The status bit will be latched and can be read and optionally cleared by MSC. The transmitter remains disabled until the status register is cleared. CAN transceiver electrical characteristics Table 42. CAN transceiver electrical characteristics Pin Symbol Description Test conditions Min Typ Max Unit CAN_TX VTX_CANLOW Input voltage dominant level Active mode -0.3 - 1.1 V VTX_CANHIGH Input voltage recessive level Active mode 2.3 - VDD +0.3 V VTX_CANHYS VTX_CANHIGH- VTX_CANLOW Active mode 0.25 0.5 - V RTX_CANPU CAN_TX pull up resistor Active Mode 50 - 250 kΩ CAN_RX VRX_CANLOW Output voltage dominant level Active mode, VDD_IO = 5 V or 3.3 V, 2 mA -- 0.5 V VRX_CANHIGH Output voltage recessive level VDD_IO -0.5 -- V |
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