FS23 datasheet(21/230 Pages) NXP

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NXP Semiconductors

FS23

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

12.2 Operation and power modes

The FS23 provides three main operating modes:

• Normal mode is intended to be the fully functional mode. All power supplies are enabled as required by the

system, and all system functionalities provided by the FS23 are available. In Normal mode, the monitoring is

available and all safety features operate in the device.

• LPON mode is the Low-power ON mode, providing support to the minimum system requirements with low

current consumption from the battery. During the LPON mode, only V1 regulator (HVBUCK or HVLDO1)

remains enabled, by default, to supply the microcontroller rail. For V1 HVBUCK configuration, an LPON-

specific output voltage can be configured by OTP, and the regulator operates in PFM mode. For V1 HVLDO1

configuration, only the internal PMOS can be used in LPON mode, and the external PNP is turned OFF.

HVLDO2 and HVLDO3 can remain in the same state as in Normal mode, depending on the SPI / I2C

configuration. HVIOx and LVIOx only stay active in LPON mode when used as wake-up sources. LPON mode

is assumed to be a safe state with no critical activity. Therefore, only monitoring of undervoltage on V1 power

rail and MCU watchdog are active to achieve minimum current consumption by the system and FS0B is

asserted low.

• LPOFF mode is the Low-power OFF mode, with no active system supplies. Logic circuitry is internally

supplied to allow proper wake up from any of the available wake-up mechanisms, with the minimum current

consumption possible.

The system can wake up from any of the Low-power modes via any of the following wake-up mechanisms

available in the device:

• WAKE1 and WAKE2 pins

• HVIOx pins

• LVIOx pins (from LPON only)

• Long duration timer (LDT) expiration

• CAN via wake-up pattern

• LIN via wake-up pattern

• GO2NORMAL SPI or I2C command via M_SYS_CFG register (from LPON only)

The FS23 will also wake up from LPON ...

• … in case of repeated watchdog error (WD_ERR_CNT = max)

• … in case of pending interrupt for more than TINTB_TO

• … in case of external reset event.

• Fail-safe mode is intended to be the safe state of the device. It is used to bring the application in a safe state

and to protect the FS23, the MCU and the full system in case of failure of the FS23 or the MCU itself. In this

mode, all regulators, safety features and systems features are disabled and the safety pins are asserted.

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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