
PIC24F16KL402 FAMILY
DS31037B-page 20
2011 Microchip Technology Inc.
SCK1
15
12
8
I/O
ST
MSSP1 SPI Serial Input/Output Clock
SCL1
12
9
8
I/O
I2C
MSSP1 I2C Clock Input/Output
SCLKI
10
7
12
I
ST
Digital Secondary Clock Input
SDA1
13
10
9
I/O
I2C
MSSP1 I2C Data Input/Output
SDI1
17
14
11
I
ST
MSSP1 SPI Serial Data Input
SDO1
16
13
9
O
—
MSSP1 SPI Serial Data Output
SOSCI
9
6
11
I
ANA
Secondary Oscillator Input
SOSCO
10
7
12
O
ANA
Secondary Oscillator Output
SS1
12
9
12
O
—
SPI1 Slave Select
T1CK
13
10
9
I
ST
Timer1 Clock
T3CK
18
15
12
I
ST
Timer3 Clock
T3G
6
3
11
I
ST
Timer3 External Gate Input
U1CTS
12
9
8
I
ST
UART1 Clear-to-Send Input
U1RTS
13
10
9
O
—
UART1 Request-to-Send Output
U1RX
6
3
12
I
ST
UART1 Receive
U1TX
11
8
11
O
—
UART1 Transmit
ULPWU
3
1
3
I
ANA
Ultra Low-Power Wake-up Input
VDD
20
17
14
P
—
Positive Supply for Peripheral Digital Logic and I/O Pins
VREF+
2
19
2
I
ANA
A/D Reference Voltage Input (+)
VREF-
3
20
3
I
ANA
A/D Reference Voltage Input (-)
VSS
19
16
13
P
—
Ground Reference for Logic and I/O Pins
TABLE 1-5:
PIC24F16KL20X/10X FAMILY PINOUT DESCRIPTIONS (CONTINUED)
Function
Pin Number
I/O
Buffer
Description
20-Pin
PDIP/
SSOP/
SOIC
20-Pin
QFN
14-Pin
PDIP/
TSSOP
Legend:
TTL = TTL input buffer
ST = Schmitt Trigger input buffer
ANA = Analog level input/output
I2C = I2C/SMBus input buffer