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NCV7382 Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV7382 Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 16 page  NCV7382 http://onsemi.com 9 Functional Description Initialization After power on, the chip automatically enters the VBAT−standby mode. In this intermediate mode the INH output will become HIGH (VS) and therefore the ECU − voltage regulator will provide the VCC−supply. The transceiver will remain in the VBAT standby mode until the controller sets it to normal operation (EN = High). Bus communication is only possible in normal mode. The NCV7382 switches itself to the VBAT−standby mode if VCC is missing or below the undervoltage lockout threshold. Operating Modes The EN pin is used to switch the NCV7382 into different operating modes. Normal Mode All of the NCV7382 is active. Switching to normal mode can only be done with EN = high. Sleep Mode The sleep mode (EN = LOW) can only be reached from normal mode and permits a very low power consumption because the transceiver and the external voltage regulator are disabled. If VCC has been switched off, a wakeup request from the bus line (remote wakeup) will cause the NCV7382 to enter the VBAT−standby mode (VCC is present again) and sets the RxD output to low until the device enters the normal operation mode (active LOW interrupt at RxD). If the INH pin is not connected to the regulator or the inhibitable external regulator is not the one that provides the VCC − supply, the normal mode is directly accessible by logic high on the EN pin. (Wakeup via mode change/local wakeup.) In order to prevent an unintended wakeup caused by disturbances in the automotive environment, incoming dominant signals from the bus have to exceed the wakeup delay time. Thermal Shutdown Mode If the junction temperature TJ is higher than 155°C, the NCV7382 could be switched into the thermal shutdown mode. Transmitter will be switched off. If TJ falls below the thermal shutdown temperature (typ. 140 °C), the NCV7382 will be switched to the previous state. Table 1. Mode Control EN VCC Comment INH RxD 0 0 VBAT−standby, Power On Vs 0 0 1 VBAT−standby, VCC On Vs X 1 1 Normal Mode Vs VCC = Recessive 0 = Dominant 0 0 Sleep Mode Floating 0 0 1 Sleep Mode Regulator not disabled Directly switch to normal mode with EN = 1 Floating VCC 0 0/1 Remote wakeup request Vs 0 − Active low wakeup interrupt LIN BUS Transceiver The transceiver consists of a bus−driver (1.2 V @ 40 mA) with slew rate control, current limit, and a receiver with a high voltage comparator with filter circuitry. BUS Input/Output The recessive BUS level is generated from the integrated 30 k pullup resistor in series with a diode. The diode prevents the reverse current on VBUS when VBUS > VS. No additional termination resistor is necessary to use the NCV7382 on LIN slave nodes. If this IC is used for LIN master nodes, it is necessary to terminate the bus with an external 1.0 k W resistor in series with a diode to VBAT or INH (See Section Short Circuit to Ground). TxD Input During transmission the signal on TxD will be transferred to the BUS driver for generating a BUS signal. To minimize the electromagnetic emission of the bus line, the BUS driver has integrated slew rate control and wave shaping. Transmitting will be interrupted in the following cases: • Sleep Mode • Thermal Shutdown • VBAT−standby The CMOS compatible input TxD directly controls the BUS level: TxD = low → BUS = low (dominant level) TxD = high → BUS = high (recessive level) |
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