SPC560P50L3 datasheet(63/112 Pages) STMICROELECTRONICS

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SPC560P44Lx, SPC560P50Lx

Electrical characteristics

Doc ID 14723 Rev 9

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3.8.2

Voltage monitor electrical characteristics

The device implements a Power-on Reset module to ensure correct power-up initialization,

as well as three low voltage detectors to monitor the VDD and the VDD_LV voltage while

device is supplied:

●

POR monitors VDD during the power-up phase to ensure device is maintained in a safe

reset state

●

LVDHV3 monitors VDD to ensure device reset below minimum functional supply

●

LVDHV5 monitors VDD when application uses device in the 5.0 V ± 10 % range

●

LVDLVCOR monitors low voltage digital power domain

3.9

Power up/down sequencing

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

SPC560P44Lx, SPC560P50Lx 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

Table 19.

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 low voltage detector high threshold

—

2.95

VFLLVDMOK_L

Flash 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

—

1.145

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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