SPC570S40E1 datasheet(39/75 Pages) STMICROELECTRONICS

Part #	SPC570S40E1

Description	32-bit Power Architecture microcontroller for automotive ASILD applications

PDF	75 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

39 / 75 page

DocID024492 Rev 7

39/75

SPC570S40Ex, SPC570S50Ex

Electrical characteristics

Figure 6 describes device behavior depending on supply signal on PORST:

PORST does not go low enough: it is filtered by input buffer hysteresis. The device

remains in the current state.

PORST goes low enough, but not for long enough: it is filtered by a low pass filter. The

device remains in the current state.

The PORST 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 extra conditions (PVT — process,

voltage, temperature).

PORST asserted for longer than WNFRST. The device is under hardware reset.

Figure 6. 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

SPC570S40E1 Datasheet(PDF) 39 Page - STMicroelectronics