PIC32MX795F512LT-80ISLASHPF datasheet(174/256 Pages) MICROCHIP

174 / 256 page

PIC32MX5XX/6XX/7XX

DS61156G-page 174

28.3

On-Chip Voltage Regulator

All PIC32MX5XX/6XX/7XX devices’ core and digital

logic are designed to operate at a nominal 1.8V. To

simplify system designs, most devices in the

PIC32MX5XX/6XX/7XX family incorporate an on-chip

regulator providing the required core logic voltage from

VDD.

A low-ESR capacitor (such as tantalum) must be

connected to the VCAP/VCORE pin (see Figure 28-2).

This helps to maintain the stability of the regulator.

The recommended value for the filter capacitor is

provided in Section 31.1 “DC Characteristics”.

28.3.1

ON-CHIP REGULATOR AND POR

It takes a fixed delay for the on-chip regulator to generate

an output. During this time, designated as TPU, code

execution is disabled. TPU is applied every time the

device resumes operation after any power-down,

including Sleep mode.

28.3.2

ON-CHIP REGULATOR AND BOR

PIC32MX5XX/6XX/7XX devices also have a simple

brown-out capability. If the voltage supplied to the

regulator is inadequate to maintain a regulated level,

the regulator Reset circuitry will generate a Brown-out

Reset. This event is captured by the BOR flag bit

(RCON<1>). The brown-out voltage levels are

specified in Section 31.1 “DC Characteristics”.

28.3.3

POWER-UP REQUIREMENTS

The on-chip regulator is designed to meet the power-up

requirements for the device. If the application does not

use the regulator, strict power-up conditions must be

adhered to. While powering up, VCORE must never

exceed VDD by 0.3V.

FIGURE 28-2:

CONNECTIONS FOR THE

ON-CHIP REGULATOR

Note:

It is important that the low-ESR capacitor

is placed as close as possible to the

VCAP/VCORE pin.

VDD

VCAP/VCORE

VSS

PIC32

CEFC(2)

3.3V(1)

Note 1:

These are typical operating voltages. Refer

to Section 31.1 “DC Characteristics” for

the full operating ranges of VDD and

VCORE.

It is important that the low-ESR capacitor

is placed as close as possible to the

VCAP/VCORE pin.

(10

μF typ)

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