
2011 Microchip Technology Inc.
DS31037B-page 17
PIC24F16KL402 FAMILY
SOSCI
9
6
11
8
I
ANA
Secondary Oscillator Input
SOSCO
10
7
12
9
O
ANA
Secondary Oscillator Output
SS1
12
9
26
23
O
—
SPI1 Slave Select
SS2
15
12
23
20
O
—
SPI2 Slave Select
T1CK
13
10
18
15
I
ST
Timer1 Clock
T3CK
18
15
26
23
I
ST
Timer3 Clock
T3G
6363
I
ST
Timer3 External Gate Input
U1CTS
12
9
17
14
I
ST
UART1 Clear-to-Send Input
U1RTS
13
10
18
15
O
—
UART1 Request-to-Send Output
U1RX
6363
I
ST
UART1 Receive
U1TX
11
8
16
13
O
—
UART1 Transmit
U2CTS
10
7
12
9
I
ST
UART2 Clear-to-Send Input
U2RTS
9
6
11
8
O
—
UART2 Request-to-Send Output
U2RX
5252
I
ST
UART2 Receive
U2TX
4141
O
—
UART2 Transmit
ULPWU
4141
I
ANA
Ultra Low-Power Wake-up Input
VDD
20
17
13, 28
10, 25
P
—
Positive Supply for Peripheral Digital Logic and
I/O Pins
VREF+
2
19
2
27
I
ANA
A/D Reference Voltage Input (+)
VREF-
3
20
3
28
I
ANA
A/D Reference Voltage Input (-)
VSS
19
16
8, 27
5, 24
P
—
Ground Reference for Logic and I/O Pins
TABLE 1-4:
PIC24F16KL40X/30X FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O
Buffer
Description
20-Pin
PDIP/
SSOP/
SOIC
20-Pin
QFN
28-Pin
SPDIP/
SSOP/
SOIC
28-Pin
QFN
Legend:
TTL = TTL input buffer
ST = Schmitt Trigger input buffer
ANA = Analog level input/output
I2C = I2C/SMBus input buffer