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NCV7356D Datasheet(PDF) 4 Page - ON Semiconductor |
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NCV7356D Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 14 page NCV7356 http://onsemi.com 4 RxD Output Pin Logic data as sensed on the single wire CAN bus. RxD Polarity • RxD = logic 1 on this pin indicates a bus recessive state (low bus voltage) • RxD = logic 0 on this pin indicates a bus normal or high voltage bus dominant state RxD in Sleep Mode RxD does not pass signals to the microprocessor while in sleep mode until a valid wake−up bus voltage level is received or the MODE0 and MODE 1 pins are not 0, 0 respectively. When the valid wake−up bus voltage signal awakens the transceiver, the RxD pin signals an interrupt (logic 0). If there is no mode change within 250 ms (typ), the transceiver re−enters the sleep mode. When not in sleep mode all valid bus signals will be sent out on the RxD pin. RxD will be placed in the undriven or off state when in sleep mode. RxD Typical Load Resistance: 2.7 k W Capacitance: < 25 pF Bus LOAD Pin Resistor ground connection with internal open−on−loss− of−ground protection When the ECU experiences a loss of ground condition, this pin is switched to a high impedance state. The ground connection through this pin is not interrupted in any transceiver operating mode including the sleep mode. The ground connection only is interrupted when there is a valid loss of ground condition. This pin provides the bus load resistor with a path to ground which contributes less than 0.1 V to the bus offset voltage when sinking the maximum current through one load resistor. The transceiver’s maximum bus leakage current contribution to Vol from the LOAD pin when in a loss of ground state is 50 mA over all operating temperatures and 3.5 < VBAT < 27 V. VBAT Input Pin (Vehicle Battery Voltage) The transceiver is fully operational as described in the Electrical Characteristics Table over the range 6.0 V < VBAT < 18 V as measured between the GND pin and the VBAT pin. For 5.0 V < VBat < 6.0 V the bus operates in normal mode with reduced dominant output voltage and reduced receiver input voltage. High voltage wakeup is not possible (dominant output voltage is the same as in normal or high−speed mode). The transceiver operates in normal mode when 18 V > VBat > 27 V at 85°C for one minute. For 0 < VBAT < 4.0 V, the bus is passive (not driven dominant) and RxD is undriven (high), regardless of the state of the TxD pin (undervoltage lockout). CAN BUS Input/Output Pin Wave Shaping in Normal and High Voltage Wake−Up Mode Wave shaping is incorporated into the transmitter to minimize EMI radiated emissions. An important contributor to emissions is the rise and fall times during output transitions at the “corners” of the voltage waveform. The resultant waveform is one half of a sin wave of frequency 50−65 kHz at the rising waveform edge and one quarter of this sin wave at falling or trailing edge. Wave Shaping in High−Speed Mode Wave shaping control of the rising and falling waveform edges are disabled during high−speed mode. EMI emissions requirements are waived during this mode. The waveform rise time in this mode is less than 1.0 ms. Short Circuits If the CAN BUS pin is shorted to ground for any duration of time, the current is limited as specified in the Electrical Characteristics Table until an overtemperature shutdown circuit disables the output high side drive source transistor preventing damage to the IC. Loss of Ground In case of a valid loss of ground condition, the LOAD pin is switched into high impedance state. The CANH transmission is continued until the undervoltage lock out voltage threshold is detected. Loss of Battery In case of loss of battery (VBAT = 0 or open) the transceiver does not disturb bus communication. The maximum reverse current into the power supply system (VBAT) doesn’t exceed 500 mA. INH Pin The INH pin is a high−voltage highside switch used to control the ECU’s regulated microcontroller power supply. After power−on, the transceiver automatically enters an intermediate standby mode, the INH output will go high (up to VBAT) turning on the external voltage regulator. The external regulator provides power to the ECU. If there is no mode change within 250 ms (typ), the transceiver re−enters the sleep mode and the INH output goes to logic 0 (floating). When the transceiver has detected a valid wake−up condition (bus HVWU traffic which exceeds the wake−up filter time delay) the INH output will become high (up to VBAT) again and the same procedure starts as described after power−on. In case of a mode change into any active mode, the sleep timer is stopped and INH stays high (up to VBAT). If the transceiver enters the sleep mode, INH goes to logic 0 (floating) after 250 ms (typ) when no wake−up signal is present |
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