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TJA1041AT Datasheet(PDF) 9 Page - NXP Semiconductors |
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TJA1041AT Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 24 page  2004 Feb 20 9 Philips Semiconductors Product specification High speed CAN transceiver TJA1041A UVNOM FLAG UVNOM is the VCC and VI/O undervoltage detection flag. The flag is set when the voltage on pin VCC drops below VCC(sleep) for longer than tUV(VCC) or when the voltage on pin VI/O drops below VI/O(sleep) for longer than tUV(VI/O). When the UVNOM flag is set, the transceiver will enter sleep mode to save power and not disturb the bus. In sleep mode the voltage regulators connected to pin INH are disabled, avoiding the extra power consumption in case of a short-circuit condition. After a waiting time (fixed by the same timers used for setting UVNOM) any wake-up request or setting of the pwon flag will clear UVNOM and the timers, allowing the voltage regulators to be reactivated at least until UVNOM is set again. UVBAT FLAG UVBAT is the VBAT undervoltage detection flag. The flag is set when the voltage on pin VBAT drops below VBAT(stb). When UVBAT is set, the transceiver will try to enter standby mode to save power and not disturb the bus. UVBAT is cleared when the voltage on pin VBAT has recovered. The transceiver will then return to the operating mode determined by the logic state of pins STB and EN. PWON FLAG Pwon is the VBAT power-on flag. This flag is set when the voltage on pin VBAT has recovered after it dropped below VBAT(pwon), particularly after the transceiver was disconnected from the battery. By setting the pwon flag, the UVNOM flag and timers are cleared and the transceiver cannot enter sleep mode. This ensures that any voltage regulator connected to pin INH is activated when the node is reconnected to the battery. In pwon/listen-only mode the pwon flag can be made available on pin ERR. The flag is cleared when the transceiver enters normal mode. WAKE-UP FLAG The wake-up flag is set when the transceiver detects a local or a remote wake-up request. A local wake-up request is detected when a logic state change on pin WAKE remains stable for at least twake. A remote wake-up request is detected after two bus dominant states of at least tBUSdom (with each dominant state followed by a recessive state of at least tBUSrec). The wake-up flag can only be set in standby mode, go-to-sleep command mode or sleep mode. Setting of the flag is blocked during the UVNOM flag waiting time. By setting the wake-up flag, the UVNOM flag and timers are cleared. The wake-up flag is immediately available on pins ERR and RXD (provided that VI/O and VCC are present). The flag is cleared at power-on, or when the UVNOM flag is set or the transceiver enters normal mode. WAKE-UP SOURCE FLAG Wake-up source recognition is provided via the wake-up source flag, which is set when the wake-up flag is set by a local wake-up request via pin WAKE. The wake-up source flag can only be set after the pwon flag is cleared. In normal mode the wake-up source flag can be made available on pin ERR. The flag is cleared at power-on or when the transceiver leaves normal mode. 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, when trying to drive the bus lines dominant. In normal mode the bus failure flag can be made available on pin ERR. The flag is cleared when the transceiver re-enters normal mode. LOCAL FAILURE FLAG In normal mode or pwon/listen-only mode the transceiver can recognize five different local failures, and will combine them into one local failure flag. The five local failures are: TXD dominant clamping, RXD recessive clamping, a TXD-to-RXD short circuit, bus dominant clamping, and over-temperature. Nature and detection of these local failures is described in Section “Local failures”. In pwon/listen-only mode the local failure flag can be made available on pin ERR. The flag is cleared when entering normal mode or when RXD is dominant while TXD is recessive, provided that all local failures are resolved. Local failures The TJA1041A can detect five 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. The following sections give the details. 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 communication. The TXD dominant time-out function prevents such a network lock-up by disabling the transmitter of the transceiver if pin TXD remains at a LOW level for longer than the TXD dominant time-out tdom(TXD). |
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