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SPSB0813 Datasheet(PDF) 16 Page - STMicroelectronics |
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SPSB0813 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 135 page  Figure 7. Interrupt pin Digital logic GND V1 Data Out Data In GND ESD prot 110KΩ GAPG1609151103CFT 3.3.5 VBAT_standby mode The transition from active mode to VBAT_standby mode is initiated by an SPI command (STBY_SEL bit and GO_STBY bit in CR2). In VBAT_standby mode, the voltage regulators V1 and V2, the power outputs as well as LIN and CAN transmitters are switched off. An NReset pulse is generated and last asserted low upon wake-up from VBAT_standby mode and until 2ms after LDO1 is fully operative. 3.4 Wake-up from standby modes A wake-up from standby mode switches the device to active mode. This can be initiated by one or more of the following events: Table 7. Wake-up source Wake-up source Description LIN bus activity It can be disabled by SPI CAN bus activity It can be disabled by SPI Level change of WU It can be configured or disabled by SPI IV1 > Icmp The device remains in V1_standby mode but watchdog is enabled (if ICMP = 0). No interrupt is generated. Timer interrupt / Wake-up of μC by TIMER Programmable by SPI: - V1_standby mode: device wakes up and interrupt signal is generated at NINT when programmable time-out has elapsed - VBAT_standby mode: device wakes up after programmable timer expiration. V1 regulator is turned on and NReset signal is generated when programmable time-out has elapsed SPI access Always active (except in VBAT_standby mode) Wake-up event: CSN falling edge To prevent the system from a deadlock condition (no wake-up from standby possible) a configuration where all wake-up is disabled, is not allowed. Accordingly, if the following condition is set by SPI: • CAN_WU_EN = 0 • LIN_WU_EN = 0 • WU1_EN = 0 • WU2_EN = 0 The effect is to put all these register bits in their default condition: • CAN_WU_EN = 1 SPSB081 Wake-up from standby modes DS14048 - Rev 1 page 16/135 |
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