FS6500 datasheet(76/153 Pages) NXP

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NXP Semiconductors

FS6500-FS4500-ASILD

Safety power system basis chip with CAN FD and LIN transceivers

driver. The CAN-bus dominant failure detection is operating when the CAN transceiver is in normal mode and

listen only mode.

12.9.2.4 CAN current limitation

The current flowing in and out of the CANH and CANL driver is limited to 100 mA, in case of a short-circuit

(parameters ICANL-SK and ICANH-SC).

12.9.2.5 CAN overtemperature

If the driver temperature exceeds the TSD (TOT), the CAN drivers are disabled and the CAN-bus returns to

the recessive state. The CAN receiver continues to operate. The CAN_MODE MSB bit is set to 0 and the flag

CAN_OT is reported in the DIAG_CAN_LIN register.

A hysteresis is implemented in this protection feature. The device overtemperature and recovery conditions

are shown in Figure 62. The CAN drivers remain disabled until the temperature has fallen below the OT

threshold minus hysteresis. The device recovers from this error detection after setting the CAN_MODE to

normal operation and when a high level is detected on TXD.

aaa-037791

Event 1

Hysteresis

Event 2

Event 3

Event 1

Event 2

high

low

Overtemperature threshold

Temperature

TXD

BUS

recessive

dominant

Event 3

Event 4

Event 1: overtemperature detection. CAN driver disable.

Event 2: temperature falls below ’overtemp. threshold minus hysteresis’ => CAN driver remains disable.

Event 3: temperature below ’overtemp. threshold minus hysteresis’ and TXD high to low transition ≥ CAN driver enable.

Event 4: temperature above ’overtemp. threshold minus hysteresis’ and TXD high to low transition ≥ CAN driver remains

disable.

Figure 62. Overtemperature behavior

12.9.2.6 Distinguish CAN diagnostics and CAN errors

The CAN errors can generate an interruption while the CAN diagnostics are reported in the digital for

information only. The interruption generated by the CAN errors can be inhibited setting the INT_INH_CAN bit in

the INIT_INH_INT register. The list of CAN diagnostic and CAN error bits is provided in Table 14.

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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