SPC574K72E5 datasheet(44/127 Pages) STMICROELECTRONICS

Part #	SPC574K72E5

Description	32-bit Power Architecture based MCU for automotive applications

PDF	127 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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44 / 127 page

Electrical characteristics

SPC574Kxx

44/127

DocID023601 Rev 5

Figure 9 describes device behavior depending on supply signal on PORST:

PORST low pulse amplitude is too low—it is filtered by input buffer hysteresis. Device

remains in current state.

PORST low pulse duration is too short—it is filtered by a low pass filter. Device remains

in current state.

PORST low pulse generates a reset:

PORST low but initially filtered during at least WFRST. Device remains initially in

current state.

PORST potentially filtered until WNFRST. Device state is unknown: it may either be

reset or remains in current state depending on other factors (temperature, voltage,

device).

PORST asserted for longer than WNFRST. Device is under reset.

Figure 9. Noise filtering on reset signal

VIL

VIH

VDD

filtered by

hysteresis

filtered by

lowpass filter

WFRST

WNFRST

filtered by

lowpass filter

WFRST

unknown reset

state

device under hardware reset

internal

reset

VHYS

VPORST, VESR0

SPC574K72E5 Datasheet(PDF) 44 Page - STMicroelectronics