STBN
EN
Normal
Mode
Receive−Only
Mode
NCV7381
Standby
Mode
Go−to−sleep
Mode
Sleep
Mode
Normal
Mode
ERRN Error Flag
Error Flag
Wake Flag
Wake Flag
Error Flag
dGo−to−sleep
dBDModeChange
dBDModeChange dBDModeChange
dBDModeChange
Figure 4. Timing Diagram of Operating Modes Control by the STBN and EN Pins
Power Supplies and Power Supply Monitoring
NCV7381 is supplied by three pins. VBAT is the main
supply both for NCV7381 and the full electronic module.
VBAT will be typically connected to the automobile battery
through a reverse−polarity protection. VCC is a 5 V
low−voltage supply primarily powering the FlexRay bus
driver core in a normal−power mode. VIO supply serves to
adapt the logical levels of NCV7381 to the host and/or the
FlexRay communication controller digital signal levels. All
supplies should be properly decoupled by filtering
capacitors − see Figure 2 and Table 2.
All three supplies are monitored by under−voltage
detectors with individual thresholds and filtering times both
for under−voltage detection and recovery – see Table 18.
Logic Level Adaptation
Level shift input VIO is used to apply a reference voltage
uVDIG = uVIO to all digital inputs and outputs in order to
adapt the logical levels of NCV7381 to the host and/or the
FlexRay communication controller digital signal levels
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