FS23 datasheet(66/230 Pages) NXP

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NXP Semiconductors

FS23

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

aaa-051457

CAN_OFF

CAN_WAKE_

CAPABLE

CAN_LISTEN

_ONLY

CAN_ACTIVE

CAN_EN_OTP = 1 and

(CAN_MODE != 00 or

CAN_WUEN != 00)

V3_UV = 1 or

CAN_MODE = 00 or

FS23_MODE ! = NORMAL

V3_UV = 1 or

CAN_MODE = 00 or

FS23_MODE ! = NORMAL

V3_UV = 0

& (CANTXD = 1

& CAN_MODE = 1x)

& FS23_MODE = NORMAL

& CAN_TSD = 0

V3_UV = 0

& (CAN_MODE = 01 or (CANTXD = 0 & CAN_MODE = 1x ))

& FS23_MODE = NORMAL

(CAN_MODE = 01 & FS23_MODE = NORMAL)

or CAN_TSD = 1

or CAN_TXD_TO = 1

From any state:

POR or CAN_EN_OTP = 0

or (CAN_MODE = 00 & CAN_WUEN = 00)

or (CAN_WUEN = 00 & FS23_MODE != NORMAL)

or ((RSTB or FS0B or LIMP0 asserted) and CAN_FS_DIS = 0)

V3_UV = 0

& CANTXD = 1

& CAN_MODE = 1x

& FS23_MODE = NORMAL

Figure 36. CAN transceiver state machine

18.1.1.1 CAN Off mode

When the CAN mode is set to 2b’00 and the CAN wake-up capability is disabled, or if the device is not in

Normal mode (that is, in LPON or LPOFF modes) and the wake-up capability is disabled, the CAN transceiver is

in Off mode.

In this mode, the normal and low-power receivers and the transmitter of the CAN transceiver are disabled, the

CANH and CANL pins are set high ohmic, and the CANRXD pin is driven high.

18.1.1.2 CAN Wake-capable mode

The CAN transceiver is in Wake-capable mode as soon as the CAN mode is different from 2b’00 or as soon as

the wake-up capability of the CAN is enabled, regardless of the device state once powered up.

In this mode, the CAN transmitter and the CAN normal receiver are disabled, only the low-power wake-capable

receiver is enabled to allow wake-up pattern detection and device wake-up. The CANH and CANL pins are

biased to ground via the Common mode input resistor RCAN_IN_CM and the CANRXD pin is driven high.

FS23

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

Product data sheet

Rev. 7.0 — 16 October 2024

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