MFS2401AVBA0ES datasheet(56/151 Pages) NXP

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NXP Semiconductors

FS2400

Fail-safe system basis chip with SMPS and LDO, CAN FD transceiver

18.1.1.3 CAN wake-up

When the CAN transceiver is in Wake-capable mode, a valid CAN wake-up is detected when a dominant

– recessive – dominant pattern is observed on the CAN bus, where the dominant and recessive phases

are longer than TCAN_WU_FILT. The total pattern is valid only if it is shorter than the wake-up timeout time

TCAN_WU_TO.

aaa-046853

Dominant

Recessive

Tpatern < TCAN_WU_TO

TREC > TCAN_WU_FILT

TDOM > TCAN_WU_FILT

CAN Bus

CAN Wake up

Figure 36. CAN Wake-up timing diagram

After a CAN wake-up event if CAN_WU_TMR_BYP = 0, once the FS2400 state machine reaches Normal mode,

CANRXD pin will be asserted low for 1.5 ms.

CAN_WU_I flag indicates that the FS2400 woke up from Low-power mode after a CAN wake-up pattern. The

flag must be cleared after each wake-up event in order for the CAN communication to work properly.

18.1.1.4 CAN Listen-only mode

The CAN transceiver Listen-only mode is entered from Wake-capable mode when CAN mode is set to 2b’01 or

when CAN mode is set to 2b’10 or 2b’11 and CANTXD is low (bus dominant) for more than TCAN_DOM_TO. The

device must be in Normal mode and no undervoltage on V3 must be detected.

In this mode, CANH and CANL pins are biased to 0.5 x V3 and CANTXD is maintained high by an internal

pullup resistor RCANTXD_PU connected to VDDIO.

The low-power wake-up receiver and the transmitter are disabled. Only the normal receiver is enabled. The

device is only able of reporting the bus level to the CANRXD pin. The device is not able to transmit information

from TXD to the bus.

18.1.1.5 CAN Active mode

The CAN transceiver Active mode is entered from Wake-capable or Listen-only mode when CAN mode is set to

2b’10 or 2b’11 and CANTXD is high (bus recessive). The device must be in Normal mode and no undervoltage

on V3 should be detected. When a TSD- or a CAN-dominant timeout is detected, the transceiver goes back to

Listen-only mode and the transmitter is disabled.

In this mode, the normal receiver and the transmitter are enabled, and the low-power receiver is disabled. The

device can transmit information from CANTXD to the CAN bus and report the bus level to the CANRXD pin.

FS2400

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

Product data sheet

Rev. 4 — 23 October 2024

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