FS26 datasheet(129/156 Pages) NXP

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NXP Semiconductors

FS26

Safety system basis chip with low power for ASIL D/ASIL B

• When function 3 is selected and the counter is launched, once the after run value is reached (EOT) the

device goes to Low-power mode. The counter is reset and restarts. When the counter reaches the wake-up

value (EOT), the device wakes up and the counter is stopped. If the device is awakened by another wake-up

source, the counter is stopped.

• When function 4 is selected and the counter is launched, once the wake-up value is reached (EOT) the device

wakes up and the counter is stopped. If the device is awakened by another wake-up source, the counter is

stopped.

• When function 5 is selected and the counter reaches its maximum value (FFFFFFh), the device wakes up and

the counter is stopped. The counter is not stopped if a wake-up event is trigged while counting. The counter

must be disabled (LDT_EN = 0) before reading its value.

aaa-045483

AFTER RUN

count

WAKE UP

count

STOP

IDLE

POR

LDT_EN = 1 AND

LPM AND (F4 | F5)

((F3 | F4) AND EOT) | (F5 AND OVRFLW)

| (Other WU source)

* (F3 | F4) AND EOT -> WU

* F5 AND OVRFLW -> WU

* (F3 | F4) AND wake-up event -> WU

LDT_EN = 1 AND

(F1 | F2 | F3)

(F1 | F2) AND EOT

* F1 AND EOT -> Interrupt event

* F2 AND EOT -> LPM

EOT: End of timer

LPM: Low power mode

OVRFLW: Time overflow

FX: Function X selected

WU: Wake up

LDT_EN = 0

F3 AND EOT

* F3 AND EOT -> LPM

Figure 47. Long duration timer state machine

FS26_SDS

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Product short data sheet

Rev. 6.0 — 12 December 2025

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