FS23 datasheet(50/230 Pages) NXP

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NXP Semiconductors

FS23

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

15 I/O interface pins

15.1 WAKE1, WAKE2

WAKE pins are high-voltage inputs used as wake-up sources for the device. WAKE inputs can be used alone or

in combination with an high-side driver (HSx) for cyclic sensing.

WAKE1 and WAKE2 are wake-up input signals with analog measurement capability through AMUX. For

example, WAKE1 can be connected to a switched VBAT (KL15 line) and WAKE2 to the wake-up output of a

CAN or FlexRay transceiver. When a WAKE pin is used as a global pin, a capacitor-resistor-capacitor filter is

required. See Section 25.

In Normal mode, any event on WAKE1 pin or WAKE2 pin generates a flag (WKx_I), when not masked

(WKx_M). In Low-power modes, a wake-up event can be generated on level (high or low) or on a cyclic sense

event, depending on WKx_WUCFG[1:0] bits.

Wake-up filtering time is configurable by SPI/I2C using WKx_DGLT bits. Internal pulldown and pullup resistors

can be enabled, disabled, or configured as cell repeater as per WKxPUPD_OTP[1:0] bits.

Note: Cell-repeater configuration is used to reduce the current consumption. In this configuration, the pullup or

pulldown selection follows the state of the internal buffer output after filtering. If the buffer output is low, pulldown

resistor is selected. If the buffer output is high, the pullup resistor is selected.

15.1.1 WAKE1 as input for Key OFF – Key ON feature

WAKE1 pin can be connected to the ignition signal of the vehicle to implement the Key OFF – Key ON feature.

The Key OFF – Key ON feature is enabled via OTP using KEY_OFFON_EN_OTP = 1. When this feature is

enabled, the car driver must turn the ignition signal OFF, then ON, to restart the device from fail-safe. As the

ignition signal is connected to WAKE1 pin, the device will only exit fail-safe to transition to LPOFF when WAKE1

= 0. In LPOFF, the device will wait for any wake-up event to restart.

aaa-051450

FAIL-SAFE

State in Main

WAKE1

state machine

LPOFF (M11)

< WAKE12VIL

> WAKE12VIH

Restart (M2)

Key OFF

Key ON

Figure 28. Key OFF – Key ON feature description.

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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