PPC5604EEMLH datasheet(31/75 Pages) FREESCALE

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Electrical characteristics

MPC5604E Microcontroller Data Sheet, Rev. 4

Freescale Semiconductor

3.8.3

Voltage monitor electrical characteristics

The device implements a POR module to ensure correct power-up initialization, as well as three low voltage detectors to

monitor the VDD_HV and the VDD_LV voltage while device is supplied:

•

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

•

LVDHV3 monitors VDD_HV to ensure device reset below minimum functional supply

•

LVDLVCOR monitors low voltage digital power domain

3.9

Power Up/Down reset sequencing

The MPC5604E implements a precise sequence to ensure each module is started only when all conditions for switching it ON

are available. This prevents overstress event or miss-functionality within and outside the device:

•

A POR module working on voltage regulator supply is controlling the correct start-up of the regulator. This is a key

module ensuring safe configuration for all Voltage regulator functionality when supply is below 1.5 V. Associated POR

(or POR) signal is active low.

IDD_BV

CC D In-rush current on VDD_BV during

power-up6

——

—

407

1 V

DD = 3.3 V ± 10%, TA = 40 to 125 °C, unless otherwise specified

2 It is required by the device in internal voltage regulation mode only.

3 This capacitance value is driven by the constraints of the external voltage regulator that supplies the V

DD_BV

voltage. A typical value is in the range of 470 nF. This capacitance should be placed close to the device pin.

4 This value is acceptable to guarantee operation from 3.0 V to 3.6 V

5 External regulator and capacitance circuitry must be capable of providing I

DD_BV while maintaining supply VDD_BV

in operating range.

6 In-rush current is seen only for short time during power-up and on standby exit (max 20 µs, depending on external

LV capacitances to be load)

7 The duration of the in-rush current depends on the capacitance placed on LV pins. BV decaps must be sized

accordingly. Refer to IMREG value for minimum amount of current to be provided in cc.

Table 14. Low voltage monitor electrical characteristics

Symbol

Parameter

Conditions1

1 V

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

Value

Unit

Min

Max

VPORH

Power-on reset threshold

—

1.5

2.7

VPORUP

D Supply for functional POR module

TA = 25°C

1.0

—

VDDHVLVDMOK_H

VDD_HV low voltage detector high threshold

—

2.95

VDDHVLVDMOK_L

PVDD_HV low voltage detector low threshold

—

2.6

—

VMLVDDOK_H

Digital supply low voltage detector high

—

1.235

VMLVDDOK_L

Digital supply low voltage detector low

—

1.095

—

Table 13. Voltage regulator electrical characteristics (continued)

Symbol

Parameter

Conditions1

Value

Unit

Min

Typ

Max

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