TJA1083TT Просмотр технического описания (PDF) - NXP Semiconductors.

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TJA1083TT

FlexRay node transceiver

NXP Semiconductors. 

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 Vi(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 Vi(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.

TJA1083

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 1 — 10 October 2012

© NXP B.V. 2012. All rights reserved.

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