SPC560P60L3 datasheet(61/104 Pages) STMICROELECTRONICS

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SPC56xP54x, SPC56xP60x

Electrical characteristics

Doc ID 18340 Rev 3

61/104

3.9

Power Up/Down sequencing

To prevent an overstress event or a malfunction within and outside the device, the

SPC56xP54/60 implements the following sequence to ensure each module is started only

when all conditions for switching it ON are available:

A POWER_ON module working on voltage regulator supply controls the correct start-

up of the regulator. This is a key module ensuring safe configuration for all voltage

regulator functionality when supply is below 1.5V. Associated POWER_ON (or POR)

signal is active low.

–

Several low voltage detectors, working on voltage regulator supply monitor the

voltage of the critical modules (voltage regulator, I/Os, flash memory and low

voltage domain). LVDs are gated low when POWER_ON is active.

–

A POWER_OK signal is generated when all critical supplies monitored by the LVD

are available. This signal is active high and released to all modules including I/Os,

flash memory and RC16 oscillator needed during power-up phase and reset

phase. When POWER_OK is low the associated modules are set into a safe state.

Table 18.

Low voltage monitor electrical characteristics

Symbol

Parameter

Conditions(1)

Value

Unit

Min

Max

VPORH

Power-on reset threshold

—

1.5

2.7

VPORUP

Supply for functional POR module

TA = 25°C

1.0

—

VREGLVDMOK_H

Regulator low voltage detector high threshold

—

2.95

VREGLVDMOK_L

Regulator low voltage detector low threshold

—

2.6

—

VFLLVDMOK_H

Flash memory low voltage detector high threshold

—

2.95

VFLLVDMOK_L

Flash memory low voltage detector low threshold

—

2.6

—

VIOLVDMOK_H

I/O low voltage detector high threshold

—

2.95

VIOLVDMOK_L

I/O low voltage detector low threshold

—

2.6

—

VIOLVDM5OK_H

I/O 5V low voltage detector high threshold

—

4.4

VIOLVDM5OK_L

I/O 5V low voltage detector low threshold

—

3.8

—

VMLVDDOK_H

Digital supply low voltage detector high

—

1.15

VMLVDDOK_L

Digital supply low voltage detector low

—

1.08

—

VDD = 3.3V ± 10% / 5.0V ± 10%, TA = –40 °C to TA MAX, unless otherwise specified

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