PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 478

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F66K80 FAMILY
28.3
All of the PIC18F66K80 family devices power their core
digital logic at a nominal 3.3V. For designs that are
required to operate at a higher typical voltage, such as
5V, all family devices incorporate two on-chip regula-
tors that allows the device to run its core logic from
V
• Normal on-chip regulator
• Ultra Low-Power, on-chip regulator
The hardware configuration of these regulators are the
same and are explained in Section 28.3.1 . The regula-
tors’ only differences relate to when the device enters
Sleep, as explained in Section 28.3.3 .
28.3.1
On PIC18FXXKXX devices, the regulator is enabled
and a low-ESR filter capacitor must be connected to
the V
maintain the regulator’s stability. The recommended
value for the filter capacitor is given in Section 31.1 DC
Characteristics .
28.3.2
On PIC18 LF XXKXX devices, the regulator is disabled
and the power to the core is supplied directly by V
The voltage levels for V
fied V
connected to the V
On the PIC18FXXKXX devices, the overall voltage
budget is very tight. The regulator should operate the
device down to 1.8V. When V
regulator no longer regulates, but the output voltage
follows the input until V
voltage, the output of the regulator output may drop
to 0V.
DS39977C-page 478
DD
. Those regulators are:
DDCORE
DDCORE
On-Chip Voltage Regulator
REGULATOR ENABLE MODE
(PIC18FXXKXX DEVICES)
REGULATOR DISABLE MODE
(PIC18LFXXKXX DEVICES)
/V
levels. A 0.1  F capacitor should be
CAP
DDCORE
pin (see
DD
DD
/V
must not exceed the speci-
reaches 1.8V. Below this
CAP
DD
Figure
drops below 3.3V, the
pin.
28-2). This helps
Preliminary
DD
.
FIGURE 28-2:
Note 1:
2:
3.3V
Capacitor
These are typical operating voltages. For the full
operating ranges of V
Section 31.1 DC Characteristics .
When the regulator is disabled, V
must be connected to a 0.1  F capacitor.
0.1  F
(1)
C
F
5V
(1)
CONNECTIONS FOR THE F
AND LF PARTS
 2011 Microchip Technology Inc.
V
V
V
DD
DDCORE
SS
PIC18F66K80
V
V
V
DD
DDCORE
SS
PIC18LF66K80
DD
/V
and V
CAP
/V
CAP (2)
DDCORE
DDCORE
, see
/V
CAP