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TJA1020 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TJA1020 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 24 page  2002 Jul 17 7 Philips Semiconductors Product specification LIN transceiver TJA1020 Wake-up via mode transition It is also possible to set pin INH HIGH with a mode transition towards normal slope/low slope mode via pin NSLP. This is useful for applications with a continuously powered microcontroller. Wake-up source recognition The TJA1020 can distinguish between a local wake-up request on pin NWAKE and a remote wake-up request via a dominant bus state. The wake-up source flag is set in case the wake-up request was a local one. The wake-up source can be read on pin TXD in the standby mode. If an external pull-up resistor on pin TXD to the power supply voltage of the microcontroller has been added a HIGH level indicates a remote wake-up request (weak pull-down at pin TXD) and a LOW level indicates a local wake-up request (strong pull-down at pin TXD; much stronger than the external pull-up resistor). The wake-up request flag (signalled on pin RXD) as well as the wake-up source flag (signalled on pin TXD) are reset immediately, if the microcontroller sets pin NSLP HIGH. TXD dominant time-out function A ‘TXD Dominant Time-out’ timer circuit prevents the bus line from being driven to a permanent dominant state (blocking all network communication) if pin TXD is forced permanently LOW by a hardware and/or software application failure. The timer is triggered by a negative edge on pin TXD. If the duration of the LOW level on pin TXD exceeds the internal timer value (tdom), the transmitter is disabled, driving the bus line into a recessive state. The timer is reset by a positive edge on pin TXD. Fail-safe features Pin TXD provides a pull-down to GND in order to force a predefined level on input pin TXD in case the pin TXD is unsupplied. Pin NSLP provides a pull-down to GND in order to force the transceiver into sleep mode in case the pin NSLP is unsupplied. Pin RXD is set floating in case of lost power supply on pin BAT. The current of the transmitter output stage is limited in order to protect the transmitter against short-circuit to pins BAT or GND. A loss of power (pins BAT and GND) has no impact to the bus line and the microcontroller. There are no reverse currents from the bus. The LIN transceiver can be disconnected from the power supply without influencing the LIN bus. The output driver at pin LIN is protected against overtemperature conditions. If the junction temperature exceeds the shutdown junction temperature Tj(sd), the thermal protection circuit disables the output driver. The driver is enabled again if the junction temperature has been decreased below Tj(sd) and a recessive level is present at pin TXD. |
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