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TJA1043 Datasheet(PDF) 9 Page - NXP Semiconductors |
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TJA1043 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 27 page TJA1043 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 3 — 24 April 2013 9 of 27 NXP Semiconductors TJA1043 High-speed CAN transceiver recessive state of at least twake(busrec) (provided the complete dominant-recessive-dominant pattern is completed within tto(wake)bus). The Wake flag can be set in Standby mode, Go-to-Sleep mode or Sleep mode. Setting the Wake flag clears the UVNOM flag and timers. Once set, the Wake flag status is immediately available on pins ERR_N and RXD (provided VIO and VBAT are present). This flag is also set at power-on and cleared when the UVNOM flag is set or the transceiver enters Normal mode. 7.2.5 Wake-up source flag Wake-up source recognition is provided via the Wake-up source flag, which is set when the Wake flag is set by a local wake-up request via the WAKE pin. The Wake-up source flag can be polled via the ERR_N pin in Normal mode (see Table 5). This flag is also set at power-on and cleared when the transceiver leaves Normal mode. 7.2.6 Bus failure flag The Bus failure flag is set if the transceiver detects a bus line short-circuit condition to VBAT, VCC or GND during four consecutive dominant-recessive cycles on pin TXD, while trying to drive the bus lines dominant. The Bus failure flag can be polled via the ERR_N pin in Normal mode (see Table 5). This flag is cleared at power-on or when the transceiver re-enters Normal mode. 7.2.7 Local failure flag In Normal and Listen-only modes, the transceiver can distinguish four different local failure events, any of which will cause the Local failure flag to be set. The four local failure events are: TXD dominant clamping, TXD-to-RXD short circuit, bus dominant clamping and an overtemperature event. The nature and detection of these local failures is described in Section 7.3. The Local failure flag can be polled via the ERR_N pin in Listen-only mode (see Table 5). This flag is cleared at power-on, when entering Normal mode or when RXD is dominant while TXD is recessive, provided that all local failures have been resolved. 7.3 Local failures The TJA1043 can detect four different local failure conditions. Any of these failures will set the Local failure flag, and in most cases the transmitter of the transceiver will be disabled. 7.3.1 TXD dominant clamping detection A permanent LOW level on pin TXD (due to a hardware or software application failure) would drive the CAN bus into a permanent dominant state, blocking all network communications. The TXD dominant time-out function prevents such a network lock-up by disabling the transmitter if pin TXD remains LOW for longer than the TXD dominant time-out time tto(dom)TXD. The tto(dom)TXD timer defines the minimum possible bit rate of 40 kbit/s. The transmitter remains disabled until the Local failure flag has been cleared. 7.3.2 TXD-to-RXD short-circuit detection A short-circuit between pins RXD and TXD would lock the bus in a permanent dominant state once it had been driven dominant, because the low-side driver of RXD is typically stronger than the high-side driver of the controller connected to TXD. TXD-to-RXD short-circuit detection prevents such a network lock-up by disabling the transmitter. The transmitter remains disabled until the Local failure flag has been cleared. |
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