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AMIS-30660 Datasheet(PDF) 4 Page - ON Semiconductor |
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AMIS-30660 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 10 page AMIS−30660 http://onsemi.com 4 FUNCTIONAL DESCRIPTION Operating Modes The behavior of AMIS−30660 under various conditions is illustrated in Table 5 below. In case the device is powered, one of two operating modes can be selected through Pin S. Table 5. FUNCTIONAL TABLE OF AMIS−30660 (X = DON’T CARE) VCC Pin TxD Pin S Pin CANH Pin CANL Bus State Pin RxD 4.75 V to 5.25 V 0 0 (or Floating) High Low Dominant 0 4.75 V to 5.25 V X 1 VCC / 2 VCC / 2 Recessive 1 4.75 V to 5.25 V 1 (or Floating) X VCC / 2 VCC / 2 Recessive 1 VCC < PORL (Unpowered) X X 0 V < CANH < VCC 0 V < CANL < VCC Recessive 1 PORL < VCC < 4.75 V > 2 V X 0 V < CANH < VCC 0 V < CANL < VCC Recessive 1 High−Speed Mode If Pin S is pulled low (or left floating), the transceiver is in its high−speed mode and is able to communicate via the bus lines. The signals are transmitted and received to the CAN controller via the Pins TxD and RxD. The slopes on the bus line outputs are optimized to give extremely low electromagnetic emissions. Silent Mode In silent mode, the transmitter is disabled. All other IC functions continue to operate. The silent mode is selected by connecting Pin S to VCC and can be used to prevent network communication from being blocked, due to a CAN controller which is out of control. Overtemperature Detection A thermal protection circuit protects the IC from damage by switching off the transmitter if the junction temperature exceeds a value of approximately 160 °C. Because the transmitter dissipates most of the power, the power dissipation and temperature of the IC is reduced. All other IC functions continue to operate. The transmitter off−state resets when Pin TxD goes high. The thermal protection circuit is particularly necessary when a bus line short−circuits. TxD Dominant Time−out Function A TxD dominant time−out timer circuit prevents the bus lines from being driven to a permanent dominant state (blocking all network communication) if Pin TxD is forced permanently low by a hardware and/or software application failure. The timer is triggered by a negative edge on pin TxD. If the duration of the low−level on Pin TxD exceeds the internal timer value tdom, the transmitter is disabled, driving the bus into a recessive state. The timer is reset by a positive edge on Pin TxD. Fail−Safe Features A current−limiting circuit protects the transmitter output stage from damage caused by an accidental short−circuit to either positive or negative supply voltage, although power dissipation increases during this fault condition. The Pins CANH and CANL are protected from automotive electrical transients (according to “ISO 7637”; see Figure 3). Pin TxD is pulled high internally should the input become disconnected. |
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