FS2302M datasheet(67/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

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-051458

Dominant

Recessive

Tpattern < TCAN_WU_TO

TREC > TCAN_WU_FILT

TDOM > TCAN_WU_FILT

CAN Bus

CAN Wake up

Figure 37. CAN Wake-up timing diagram

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 to report 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 must 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.

FS23

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Product data sheet

Rev. 7.0 — 16 October 2024

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