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L99DZ320 Datasheet(PDF) 59 Page - STMicroelectronics |
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L99DZ320 Datasheet(HTML) 59 Page - STMicroelectronics |
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59 / 146 page  3.10.2 CAN transceiver operating modes Figure 23. Transceiver state diagram VBAT Standby V1 Standby ACTIVE TRX Normal CANACT = 1 SPI cmd: goVBATstby SPI cmd: goV1stby (if CAN_WU_ENA=1) Wake-up pattern (WUP) or SPI Flag: WAKE CAN Interrupt: INT => back to original state RX = OFF TX = OFF WUP decod. = ON RX = OFF TX = OFF WUP decod. = ON RX = ON TX = ON WUP decod. = OFF RX = OFF TX = OFF WUP decod.= ON RX Receive only Mode CAN REC Only = 0 CAN REC Only = 1 RX = ON TX = OFF WUP decod.= OFF CAN TRX STBY Bias on CAN TRX STBY Bias off CAN AUTO_BIAS=0 or CAN communication timeout Flag:CANTO CAN TRX STBY Bias on CAN TRX STBY Bias off CAN AUTO_BIAS=0 or CAN communication timeout Flag:CANTO CAN TRX STBY Bias on CAN TRX STBY Bias off CAN AUTO_BIAS=0 or CAN communication timeout Flag:CANTO WUP decod. = WUP by decoding a dominant-recessive-dominant pattern CANACT = 0 CAN AUTO_BIAS=1 and CAN bus activity CANACT = 0 and CAN AUTO_BIAS=1 CANACT = 0 and CAN AUTO_BIAS=0 (if CAN_WU_ENA=1) Wake-up pattern (WUP) Flag: WAKE CAN NRESET generated => back to original state CAN AUTO_BIAS=1 and CAN bus activity CAN AUTO_BIAS=1 and CAN bus activity TRX normal mode Full functionality of the CAN transceiver is available (transmitter and receiver) and the automatic voltage biasing is enabled. State transitions from TRX normal mode to VBAT_Standby and V1_Standby are possible. No interrupt is generated in this mode. CAN TRX STBY mode The CAN transmitter is disabled in this mode and the RXDC pin is kept at high (recessive) level. CAN receiver is capable of detecting a wake-up pattern (WUP). In V1_Standby mode and VBAT_Standby mode, a WUP is indicated to the microcontroller by an interrupt signal. There is no automatic state transition into TRX normal mode in the case of a detected CAN wake-up signal (WUP). After serving the interrupt, the microcontroller can initiate a state transition into TRX normal mode by setting the SPI bit CAN_ACT to '1'. (This can be done 160 μs after enabling the wake-up through CAN_WU_EN=1). Moreover, in this mode two further submodes are possible (“Bias ON” or “Bias OFF”), depending on the CAN_AUTO_BIAS bit in CR1 (compliant with ISO 11898-2:2016) or timeout conditions. 3.10.3 CAN error handling The devices provide the following four error handling features. After power on reset (VS > VPOR) the CAN transceiver is disabled. The transceiver is enabled by setting CAN_ACT = 1. The CAN transmitter is disabled automatically in case of the following errors: • Dominant TXDC time out • CAN permanent recessive • RXDC permanent recessive • TSD1 on cluster 8 (global) if TSD_CLUSTER_EN = 1 • TSD1 on any clusters if TSD_CLUSTER_EN = 0 (default) L99DZ320 Functional description DS14235 - Rev 5 page 59/146 |
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