SPC572L64F2 datasheet(66/112 Pages) STMICROELECTRONICS

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Electrical characteristics

SPC572Lx

66/112

DocID027866 Rev 5

3.15.4

Power up/down sequencing

The following table shows the constraints and relationships for the different power supplies.

During power-up, all functional terminals are maintained into a known state as described in

the following table.

tVDASSERT

CC D Voltage detector

threshold crossing

assertion

—0.1

—

µs

tVDRELEASE

CC D Voltage detector

threshold crossing

de-assertion

—5

—

µs

1. For VDD_LV levels, a maximum of 30 mV IR drop is incurred from the pin to all sinks on the die. For other LVD, the IR drop

is estimated by the multiplying the supply current by 0.5

Ω.

2. The threshold for all PORs and LVDs are defined when the output transits to 1, i.e., when the sense goes above the

reference.

3. Across process, temperature and voltage range.

Table 32. Voltage monitor electrical characteristics(1) (continued)

Symbol

Parameter

Conditions

Value(2)

Unit

Min

Typ

Max

Table 33. Device supply relation during power-up/power-down sequence

Supply 2(1)

VDD_LV

VDD_HV_IO

VDD_HV_ADV

VDD_HV_ADR

ALTREF(2)

VDD_LV

VDD_HV_IO

VDD_HV_ADV

VDD_HV_ADR

5mA

ALTREF

10 mA(3)

1. Grey cells: Supply 1 (row) can exceed Supply 2 (column), granted that external circuitry ensures current flowing from

supply1 is less than absolute maximum rating current value provided.

2. ALTREF are the alternate references for the ADC that can be used in place of the default reference (VDD_HV_ADR_*). It is

the SARB.ALTREF.

3. ADC performance is not guaranteed with ALTREFn above VDD_HV_IO/VDD_HV_ADV.

Table 34. Functional terminals state during power-up and reset

TERMINAL(1)

POWER-UP(2)

pad state

RESET

pad state

Default

pad state(3)

Comments

PORST

Strong pull-

down(4)

Weak pull-down

Power-on reset pad

ESR0(5)

Strong pull-down

Weak pull-up

Functional reset pad

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