FS6500 datasheet(80/153 Pages) NXP

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NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

aaa-037796

VLIN_REC

60 % VSUP

LIN BUS SIGNAL

tREC_PDF

tREC_PDR

VSUP

40 % VSUP

VBUSREC

VBUSDOM

RXD

Figure 67. LIN receiver timings

12.10.4 Fault detection

12.10.4.1 VSUP undervoltage

A VSUP undervoltage (VLIN_UV) detection is implemented to be compliant with SAEJ2602-2(24) standard. At low

VSUP voltage (VSUP<VLIN_UV), the LIN bus goes into recessive state to avoid wrong communication.

12.10.4.2 TXDL permanent dominant (timeout)

If TXDL is set low for a time longer than the tXD_DOM parameter, the LIN driver is disabled and the LIN bus

returns to the recessive state. This prevents the bus from being set in dominant state permanently, in case a

failure sets the TXDL input permanently to a low level.

The LIN receiver continues to operate. The LIN_mode MSB bit is set to 0 and the TXDL_DOM flag is reported in

the DIAG_CAN_LIN register. The device recovers from this error detection after setting the LIN_mode to normal

operation, and when a high level is detected on TXDL. The TXDL failure detection is operating when the LIN

transceiver is in normal mode and listen only mode.

12.10.4.3 RXDL permanent recessive

If RXDL is detected high for seven consecutive receive/dominant cycles, the LIN driver and receiver are

disabled and the LIN bus returns to the recessive state. The LIN_mode MSB bit is set to 0 and the RXDL_REC

flag is reported in the DIAG_CAN_LIN register. The device recovers from this error detection after setting the

LIN_mode to normal operation, and after a LIN dominant transition. The RXDL failure detection is operating

when the LIN transceiver is in normal mode and listen only mode.

12.10.4.4 LIN bus short-circuit

If the LIN bus is dominant for a time longer than tLIN_SHORT_GND, due for instance to an external short-circuit to

GND, the detection is reported to the device main logic. The BUS bus failure detection is operating when the

LIN transceiver is in normal mode and listen only mode.

12.10.4.5 LIN current limitation

In case of a LIN short-circuit to the battery, the current flowing out of the LIN driver is limited to 200 mA

(IBUS_LIM), and the LIN driver is not shutdown. The LIN bus goes into the recessive state when the current

limitation occurs and returns in the same functional mode as before the failure when the current fell below the

current limitation value.

FS6500-FS4500-ASILD

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

Product data sheet

Rev. 8 — 5 August 2024

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