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TH8055JDC Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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TH8055JDC Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 20 page TH8055 Single Wire CAN Transceiver 2.5 2.6 VBAT INPUT pin Vehicle Battery Voltage The transceiver is fully operational as described in Table Static Characteristics over the range 5 < VBAT < 18 volts as measured between the GND pin and the VBAT pin. For 0 < VBAT < 4.95 volts, the bus is passive (not be driven dominant) and RxD is undriven (high), regardless of the state of the TxD pin (undervoltage lockout). The transceiver operates in normal mode when 18V > VBat IC > 27V at 85°C for one minute. Other active modes are possible until thermal shutdown (because of increased power dissipation), the transceiver does not disturb normal communication. CAN BUS input/output pin Wave Shaping in normal and 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 one µs. Short circuits If the CAN BUS pin is shorted to ground for any duration of time, the current is limited as specified in table “static characteristics” and an over temperature shut down circuit disables the output high side drive source transistor before the local die temperature exceeds the damage limit threshold. 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 do not disturb bus communication. The maximum reverse current into power supply system doesn‘t exceed 1mA. TH8055 - Datasheet Page 6 of 20 3901008055 May 2004 Rev 005 |
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