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TJA1083 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TJA1083 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 41 page TJA1083 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1 — 10 October 2012 7 of 41 NXP Semiconductors TJA1083 FlexRay node transceiver 6.1.1.1 Bus activity and idle detection In Normal mode, bus activity and bus idle are detected as follows: • Bus activity is detected when the absolute differential voltage on the bus lines is higher than V i(dif)det(act) for tdet(act)(bus): – If the differential voltage on the bus lines is lower than VIL(dif) after bus activity has been detected, pin RXD switches LOW. – If the differential voltage on the bus lines is higher than VIH(dif) after bus activity has been detected, pin RXD remains HIGH. • Bus idle is detected when the absolute differential voltage on the bus lines is lower than V i(dif)det(act) for tdet(idle)(bus). This results in pin RXD being switched HIGH or staying HIGH. 6.1.2 Standby mode Standby mode is a low-power mode featuring very low current consumption. In Standby mode, the transceiver is unable to transmit or receive data since both the transmitter and the normal receiver are switched off. The low-power receiver is activated to monitor the bus for wake-up activity, provided an undervoltage has not been detected on pin VCC. The low-power receiver is deactivated if an undervoltage is detected on pin VCC - with the result that the wake flag is not set if a wake-up pattern or dedicated data frame is received. Pins ERRN and RXD indicate the status of the wake flag when VIO and VCC are within their operating ranges. See Table 3 for a description of pins ERRN and RXD when an undervoltage is detected on pin VIO or pin VCC. The status register cannot be read via the SPI interface if an undervoltage is detected on pin VIO. The BGE input has no effect in Standby mode. 6.1.3 Power-off mode The transmitter and the two receivers (normal and low-power) are deactivated in Power-off mode. As a result, the wake flag is not set if a wake-up pattern or dedicated data frame is received. If the voltage at VCC rises above Vth(rec)POR, the transceiver switches to Standby mode and the digital section is reset. If VCC subsequently drops below Vth(det)POR, the transceiver reverts to Power-off mode (see Section 6.2). The status register cannot be read via the SPI interface in Power-off mode. 6.1.4 State transitions Figure 4 shows the TJA1083 state transition diagram. The timing diagram for the ERRN indication signal during transitions between Normal and Standby modes, when the error flag is set and the wake flag is not set, is illustrated in Figure 5 and described in Table 6. |
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