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NCV7381DP0R2G Datasheet(PDF) 4 Page - ON Semiconductor |
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NCV7381DP0R2G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 23 page NCV7381 www.onsemi.com 4 FUNCTIONAL DESCRIPTION Operating Modes NCV7381 can switch between several operating modes depicted in Figure 3. In Normal and Receive−only modes, the chip interconnects a FlexRay communication controller with the bus medium for full−speed communication. These two modes are also referred to as normal−power modes. In Standby and Sleep modes, the communication is suspended and the power consumption is substantially reduced. A wakeup on the bus or through a locally monitored signal on pin WAKE can be detected and signaled to the host. Go−to−sleep mode is a temporary mode ensuring correct transition between any mode and the Sleep mode. All three modes – Standby, Sleep and Go−to−sleep – are referred to as low−power modes. The operating mode selected is a function of the host signals STBN and EN, the state of the supply voltages and the wakeup detection. As long as all three supplies (VBAT, VCC, VIO) remain above their respective under−voltage detection levels, the logical control by EN and STBN pins shown in Figure 3 applies. Influence of the power−supplies and of the wakeup detection on the operating modes is described in subsequent paragraphs. Normal Mode Transmitter: on Receiver: on INH: High Power cons.: normal Standby Mode Receive−only Mode Transmitter: off Receiver: on INH: High Power cons.: normal Go−to−sleep Mode Transmitter: off Receiver: wakeup−detection INH: High Power cons.: low Sleep Mode Transmitter: off Receiver: wakeup−detection INH: floating Power cons.: low STBN=H EN=H STBN=H EN=L STBN=L EN=L STBN=L EN=H STBN=L EN=L STBN=L EN=H STBN=H EN=L STBN=H EN=H STBN=L, EN=H for <dGo−to−Sleep STBN=L, EN=H for >dGo−to−Sleep Power−up Figure 3. Operating Modes and their Control by the STBN and EN Pins Transmitter: off Receiver: wakeup−detection INH: High Power cons.: low STBN=H EN=H STBN=H EN=H STBN=L EN=L STBN=H EN=L STBN=H EN=L STBN=L EN=H |
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