PIC18F24J10-E/ML MICROCHIP [Microchip Technology], PIC18F24J10-E/ML Datasheet - Page 238

• Manufacturer Part Number: PIC18F24J10-E/ML
• Description: 28/40/44-Pin High-Performance RISC Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F45J10 FAMILY
20.3
In parts designated “LF”, the microcontroller core can
be powered from an external source that is separate
from V
tor which derives power from V
the common V
In “F” devices, a low ESR capacitor must be connected
to the V
In parts designated with an “LF” part number (i.e.,
PIC18LF45J10), power to the core must be supplied on
V
have sufficient capacitance on all supply pins.
Examples are shown in Figure 20-2.
The specifications for core voltage and capacitance are
listed in Section 23.4 “AC (Timing) Characteristics”.
FIGURE 20-2:
DS39682C-page 236
DDCORE
Note:
Note:
PIC18LFXXJ10 Devices (Regulator Disabled):
PIC18FXXJ10 Devices (Regulator Enabled):
OR
DD
DDCORE
2.5V
On-Chip Voltage Regulator
, or it can be powered from an on-chip regula-
/V
CAP
The on-chip voltage regulator is only
available in parts designated with an “F”,
such as PIC18F45J10.
In parts designated with an “LF”, such as
PIC18LF45J10, V
exceed V
C
DDCORE
. It is always good design practice to
F
/V
3.3V
2.5V
3.3V
CAP
DD
/V
pin for proper device operation.
CONNECTIONS FOR THE
ON-CHIP REGULATOR
.
CAP
V
V
V
V
V
V
V
V
V
DD
DDCORE
SS
DD
DDCORE
SS
DD
DDCORE
SS
PIC18FXXJ10
PIC18LFXXJ10
pin.
PIC18LFXXJ10
DDCORE
DD
/V
/V
/V
. Both sources use
CAP
CAP
CAP
must never
Preliminary
20.3.1
PIC18F45J10 family devices (designated with an “F”
part number) 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 4.4
(PIC18F2X1X/4X1X Devices Only)” and Section 4.4.1
“Detecting BOR”. The brown-out voltage levels are
specific in Section 23.1 “DC Characteristics”.
20.3.2
The on-chip regulator is designed to meet the power-up
requirements for the device. While powering up,
V
DDCORE
must never exceed V
ON-CHIP REGULATOR AND BOR
POWER-UP REQUIREMENTS
“Brown-out
© 2007 Microchip Technology Inc.
DD
by 0.3 volts.
Reset
(BOR)