PIC18F2331/2431/4331/4431
2.0
GUIDELINES FOR GETTING
STARTED WITH PIC18F
MICROCONTROLLERS
Basic Connection Requirements
FIGURE 2-1:
RECOMMENDED
MINIMUM CONNECTIONS
C2
(1)
2.1
V
DD
V
DD
MCLR
Getting started with the PIC18F2331/2431/4331/4431
family of 8-bit microcontrollers requires attention to a
minimal set of device pin connections before
proceeding with development.
The following pins must always be connected:
• All V
DD
and V
SS
pins
(see
• All AV
DD
and AV
SS
pins, regardless of whether or
not the analog device features are used
(see
• MCLR pin
(see
These pins must also be connected if they are being
used in the end application:
• PGC/PGD pins used for In-Circuit Serial
Programming™ (ICSP™) and debugging purposes
(see
• OSCI and OSCO pins when an external oscillator
source is used
(see
Additionally, the following pins may be required:
• V
REF
+/V
REF
- pins are used when external voltage
reference for analog modules is implemented
Note:
The AV
DD
and AV
SS
pins must always be
connected, regardless of whether any of
the analog modules are being used.
R1
R2
V
SS
C1
V
DD
PIC18FXXXX
V
SS
V
SS
C3
(1)
C6
(1)
AV
DD
V
DD
AV
SS
V
DD
V
SS
C5
(1)
C4
(1)
Key (all values are recommendations):
C1 through C6: 0.1 µF, 20V ceramic
R1: 10 kΩ
R2: 100Ω to 470Ω
Note 1:
The example shown is for a PIC18F device
with five V
DD
/V
SS
and AV
DD
/AV
SS
pairs.
Other devices may have more or less pairs;
adjust the number of decoupling capacitors
appropriately.
The minimum mandatory connections are shown in
2010 Microchip Technology Inc.
DS39616D-page 25
MICROCHIP [ MICROCHIP TECHNOLOGY ]
