Datasheet
2010 Microchip Technology Inc. DS39616D-page 7
PIC18F2331/2431/4331/4431
Pin Diagrams (Continued)
44-Pin QFN
(2)
10
11
2
3
4
5
6
1
18
19
20
21
22
12
13
14
15
38
8
7
44
43
42
41
40
39
16
17
29
30
31
32
33
23
24
25
26
27
28
36
34
35
9
PIC18F4331
37
RA3/AN3/VREF+/CAP2/QEA
RA2/AN2/V
REF-/CAP1/INDX
RA1/AN1
RA0/AN0
MCLR
/VPP/RE3
RB3/PWM3
RB7/KBI3/PGD
RB6/KBI2/PGC
RB5/KBI1/PWM4/PGM
(2)
RB4/KBI0/PWM5
NC
RC6/TX/CK/SS
RC5/INT2/SCK
(1)
/SCL
(1)
RC4/INT1/SDI
(1)
/SDA
(1)
RD3/SCK/SCL
RD2/SDI/SDA
RD1/SDO
RD0/T0CKI/T5CKI
RC3/T0CKI
(1)
/T5CKI
(1)
/INT0
RC2/CCP1/FLTB
RC1/T1OSI/CCP2/FLTA
RC0/T1OSO/T1CKI
OSC2/CLKO/RA6
OSC1/CLKI/RA7
V
SS
AVDD
VDD
RE2/AN8
RE1/AN7
RE0/AN6
RA5/AN5/LVDIN
RA4/AN4/CAP3/QEB
RC7/RX/DT/SDO
RD4/FLTA
(3)
RD5/PWM4
(4)
RD6/PWM6
RD7/PWM7
V
SS
VDD
AVDD
RB0/PWM0
RB1/PWM1
RB2/PWM2
PIC18F4431
AVSS
Note 1: RC3 is the alternate pin for T0CKI/T5CKI; RC4 is the alternate pin for SDI/SDA; RC5 is the alternate pin
for SCK/SCL.
2: For the QFN package, it is recommended that the bottom pad be connected to V
SS.
3: RD4 is the alternate pin for FLTA
.
4: RD5 is the alternate pin for PWM4.