PIC18F44J10-ISLASHSOSQTP datasheet(245/368 Pages) MICROCHIP

245 / 368 page

DS39682E-page 243

PIC18F45J10 FAMILY

21.3

On-Chip Voltage Regulator

In parts designated “LF”, the microcontroller core is

powered from an external source that is separate from

VDD. This voltage is supplied on the VDDCORE pin.

In “F” devices, a low-ESR capacitor must be connected

to the VDDCORE/VCAP pin for proper device operation.

In parts designated with an “LF” part number (i.e.,

PIC18LF45J10), power to the core must be supplied on

VDDCORE/VCAP. It is always good design practice to

have sufficient capacitance on all supply pins.

Examples are shown in Figure 21-2.

The specifications for core voltage and capacitance

are listed inTable 24-4 of Section 24.0 “Electrical

Characteristics”

FIGURE 21-2:

CONNECTIONS FOR THE

ON-CHIP REGULATOR

21.3.1

ON-CHIP REGULATOR AND BOR

When the on-chip regulator is enabled, PIC18F45J10

family 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 BOR Reset. This event is captured by

the BOR flag bit (RCON<0>).

The operation of the BOR is described in more detail in

Section 5.4

“Brown-out

Reset

(BOR)

(PIC18F2XJ10/4XJ10

Devices

Only)”

and

Section 5.4.1 “Detecting BOR”

. The brown-out voltage

levels are specific in Section 23.1 “DC Characteristics:

Supply Voltage”

21.3.2

POWER-UP REQUIREMENTS

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

requirements for the device. While powering up,

VDDCORE must never exceed VDD by 0.3 volts.

Note:

The on-chip voltage regulator is only

available in parts designated with an “F”,

such as PIC18F45J10.

Note:

In parts designated with an “LF”, such as

PIC18LF45J10, VDDCORE must never

exceed VDD.

VDD

VDDCORE/VCAP

VSS

PIC18LFXXJ10

3.3V

2.5V

VDD

VDDCORE/VCAP

VSS

PIC18FXXJ10

CEFC

3.3V

PIC18FXXJ10 Devices (Regulator Enabled):

VDD

VDDCORE/VCAP

VSS

PIC18LFXXJ10

2.5V

PIC18LFXXJ10 Devices (Regulator Disabled):

PIC18F44J10-I/SOSQTP Datasheet(PDF) 245 Page - Microchip Technology

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