FS26 datasheet(113/156 Pages) NXP

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NXP Semiconductors

FS26

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

TA = –40 °C to 125 °C, unless otherwise specified. VSUP_UVH < VSUP < 36 V, VPRE_PWM + VPRE_HDR < VSUP_PWR < 36 V, unless otherwise specified. All voltages

are referenced to ground.

Symbol

Description

Min

Typ

Max

Unit

FOSC_MOD_RANGE

Spread spectrum range (around the nominal frequency)

-6

—

Table 113. Clock management electrical characteristics...continued

19.2 Analog multiplexer: AMUX

Various internal and application voltages can be monitored through the AMUX pin. Examples include critical

FS26 parameters and system level safety parameters. The channel to be monitored can be selected via the

SPI. The maximum AMUX output voltage range is VDDIO.

SPI

aaa-045472

COUT

To MCU ADC

AMUX

VCORE -

Signals with 7.5

or 14 divider ratio

Signals without

divider ratio

Signals with 2.5 divider ratio

Signals with 1.5 divider ratio

VDDIO

Buffer

GND

Mux

AMUX [4:0]

VPRE -

LDO1 -

LDO2 -

VREF -

TRK1 -

TRK2 -

VDDIO -

VBOS -

VBST -

VSUP -

WAKE1 -

WAKE2 -

GPIO1 -

GPIO2 -

BATSENSE -

Temperature sensors -

Internal voltages references -

Internal biasing supply -

Figure 36. AMUX block diagram

19.2.1 AMUX channel selection

AMUX_EN

AMUX[4:0]

Signal selection for AMUX output

AMUX_DIV = 0 AMUX_DIV = 1

xxxxx

Disabled with AMUX pin pulled to ground

N/A

00000

(default)

Disabled with AMUX pin in Hi-Z

N/A

00001

Low power bandgap for main domain (1.0 V ± 0.5 %)

00010

Bandgap for main domain (1.0 V ± 0.5 %)

00011

Bandgap for fail-safe domain (1.0 V ± 0.5 %)

00100

Analog voltage supply for main domain (1.6 V ± 50 mV)

Table 114. AMUX output selection

FS26_SDS

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Product short data sheet

Rev. 6.0 — 12 December 2025

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