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TJA1080ATS/2/T Datasheet(PDF) 15 Page - NXP Semiconductors |
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TJA1080ATS/2/T Datasheet(HTML) 15 Page - NXP Semiconductors |
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15 / 49 page  TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 6 — 28 November 2012 15 of 49 NXP Semiconductors TJA1080A FlexRay transceiver 6.2.5 Sleep mode In Sleep mode the transceiver has entered a low power mode. The only difference with Standby mode is that pin INH1 is also set floating. Sleep mode is also entered if the UVVIO or UVVBAT flag is set. In case of an undervoltage on pin VCC or VBAT while VIO is present, the wake flag is set by a positive edge on pin STBN. The undervoltage flags will be reset by setting the wake flag, and therefore the transceiver will enter the mode indicated on pins EN and STBN if VIO is present. A detailed description of the wake-up mechanism is given in Section 6.5. 6.3 Operating modes in star configuration In star configuration mode control via pins EN and STBN is not possible. The transceiver autonomously controls the operating modes except in the case of wake-up. The timing diagram of a transceiver configured in star configuration is illustrated in Figure 7. The state diagram in star configuration is illustrated in Figure 6. A detailed description of the pin signalling in star configuration is given in Table 9. If VIO and (VBUF or VBAT) are within their operating ranges, pin ERRN indicates the status of the error flag. Operating ranges are: VBAT = 6.5 V to 60 V, VCC = 4.75 V to 5.25 V, VBUF = 4.75 V to 5.25 V and VIO = 2.2 V to 5.25 V. [1] Pin ERRN provides a serial interface for retrieving diagnostic information. [2] TRXD lines switched as output if TXEN activity is the initiator for Star-transmit mode. [3] TRXD lines are switched as input if TRXD activity is the initiator for Star-transmit mode. [4] Valid if VIO and (VBUF or VBAT) are present. Pin BGE must be HIGH in order to enable the transmitter via pin TXEN. If pin BGE is LOW, it is not possible to activate the transmitter via pin TXEN. If pin TXEN is not used (no controller connected to the transceiver), it has to be connected to pin GND in order to prevent TXEN activity detection. In all normal modes pin RXD is connected to the output of the normal mode receiver and therefore represents the data on the bus lines. Table 9. Pin signalling in star configuration Mode TRXD0 / TRXD1 ERRN[1] RXEN RXD Transmitter INH1 INH2 LOW HIGH LOW HIGH LOW HIGH Star-transmit output[2] input[3] error flag set error flag reset bus activity bus idle bus DATA_0 bus DATA_1 or idle enabled HIGH HIGH Star-receive output disabled Star-idle input Star-locked input Star-standby input error flag set[4] error flag reset wake flag set[4] wake flag reset wake flag set[4] wake flag reset Star-sleep input float float |
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