PIC18FXXK80 Datasheet, PDF (7/52 Pages) Microchip Technology – Flash Microcontroller Programming Specification

PIC18FXXK80 FAMILY
2.3 On-Chip Voltage Regulator
The PIC18FXXK80 device family is available with or
without an internal core voltage regulator.
On the devices with a voltage regulator (“PIC18F” in the
part number), the regulator is always enabled. The reg-
ulator input is taken from the microcontroller VDD pins.
The output of the regulator is supplied internally to the
VDDCORE/VCAP pin. This pin simultaneously serves as
both the regulator output and the microcontroller core
power input pin. For these devices, a low-ESR (< 5Ω)
capacitor is required on the VCAP/VDDCORE pin to stabi-
lize the voltage regulator output voltage. The VCAP/
VDDCORE pin must not be connected to VDD and must
use a capacitor that is typically 10 F connected to
ground.
On the devices that do not have a voltage regulator
(“PIC18LF” in the part number), power to the CPU core
must be externally supplied through the microcontroller
VDD pins. VDDCORE/VCAP is internally connected to VDD.
A 0.1 µF capacitor should be connected to the VDDCORE/
VCAP pin. Examples are shown in Figure 2-6.
The specifications for core voltage and capacitance are
listed in Section 6.0 “AC/DC Characteristics Timing
Requirements for Program/Verify Test Mode”.
FIGURE 2-6:
CONNECTIONS FOR THE
ON-CHIP REGULATOR
Regulator Enabled (PIC18FXXK80 Parts):
5V⁽¹⁾
PIC18FXXK80
VDD
VDDCORE/VCAP
CF
VSS
Regulator Disabled (PIC18LFXXK80 Parts):
3.3V⁽¹⁾
PIC18LFXXK80
VDD
VDDCORE/VCAP⁽²⁾
CF
VSS
Note 1:
2:
These are typical operating voltages. Refer
to Section 6.0 “AC/DC Characteristics
Timing Requirements for Program/Verify
Test Mode”.
When the regulator is disabled, VDDCORE/
VCAP must be connected to a 0.1 µF
capacitor.
 2011 Microchip Technology Inc.
DS39972B-page 7