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NCV7381DP0R2G Datasheet(PDF) 7 Page - ON Semiconductor |
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NCV7381DP0R2G Datasheet(HTML) 7 Page - ON Semiconductor |
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7 / 23 page  NCV7381 http://onsemi.com 7 Operating Mode Changes Caused by Internal Flags Changes of some internal flags described in Table 3 can force an operating mode transition complementing or overruling the operating mode control by the digital inputs STBN and EN which is shown in Figure 3: • Setting the VBAT or VIO under−voltage flag causes a transition to the Sleep mode • Setting the VCC under−voltage flag, while the bus driver is not in Sleep, causes a transition to the Standby mode • Reset of the Under−voltage flag (i.e. recovery from under−voltage) re−enables the control of the chip by digital inputs STBN and EN. • Setting of the Wake flag causes the reset of all under−voltage flags and the NCV7381 transitions to the Standby mode. The reset of the under−voltage flags allows the external power supplies to stabilize properly if, for example, they were previously switched off during Sleep mode. FlexRay Bus Driver NCV7381 contains a fully−featured FlexRay bus driver compliant with Electrical Physical Layer Specification Rev. 3.0.1. The transmitter part translates logical signals on digital inputs TxEN, BGE and TxD into appropriate bus levels on pins BP and BM. A transmission cannot be started with Data_1. In case the transmitter is enabled for longer than dBDTxActiveMax, the TxEN Timeout flag is set and the current transmission is disabled. The receiver part monitors bus pins BP and BM and signals the detected levels on digital outputs RxD and RxEN. The different bus levels are defined in Figure 5. The function of the bus driver and the related digital pins in different operating modes is detailed in Table 4 and Table 5. • The transmitter can only be enabled if the activation of the transmitter is initiated in Normal mode. • The receiver function is enabled by entering a normal−power mode. BP BM Idle_LP Idle Data_0 Data_1 Figure 5. FlexRay Bus Signals VCC/2 uBus Table 4. TRANSMITTER FUNCTION AND TRANSMITTER−RELATED PINS Operating Mode BGE TxEN TxD Transmitted Bus Signal Standby, Go−to−sleep, Sleep x x x Idle_LP Receive−only x x x Idle Normal 0 x x Idle 1 1 x Idle 1 0 0 Data_0 1 0 1 Data_1 Table 5. RECEIVER FUNCTION AND RECEIVER−RELATED PINS Operating Mode Signal on Bus Wake flag RxD RxEN Standby, Go−to−sleep, Sleep x not set High High x set Low Low Normal, Receive−only Idle x High High Data_0 x Low Low Data_1 x High Low |
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