Users Manual

FEDK71521-01
MK71521/MK71521A
4/14
■ List of Pins
Pin
Symbol
Function
Attribute/value
at reset
Description
1
N.C.
Not Connected
-
Not Connected pin
2
N.C.
Not Connected
-
Not Connected pin
3
ANT
Antenna In/OUT
-
Internal antenna port. It should be connected to PAD 35(RF
IO) for normal operation.
4
GND
Ground
-
Ground PAD
5
P0.24
Digital I/O
Input
General purpose I/O
6
GND
Ground
-
Ground PAD
7
DCO
Power
-
Test pin(DC/DC converter output )
Be sure to use this pin open.
8
P0.28
Digital I/O
Input
General purpose I/O
9
P0.29
Digital I/O
Input
General purpose I/O
10
VBAT
Power
-
Power supply PAD
11
GND
Ground
-
Ground PAD
12
P0.23
Digital I/O
Input
General purpose I/O
13
P0.22
Digital I/O
Input
"General purpose I/O
14
P0.25
Digital I/O
Input
General purpose I/O
15
GND
Ground
-
Ground PAD
16
P0.26
Digital I/O
Input
General purpose I/O
17
P0.27
Digital I/O
Input
General purpose I/O
18
P0.30
Digital I/O
Input
"General purpose I/O
19
P0.31
Digital I/O
Input
General purpose I/O
20
GND
Ground
-
Ground PAD
21
GND
Ground
-
Ground PAD
22
P0.06
Digital I/O
Input
General purpose I/O
23
P0.04
Digital I/O
Input
General purpose I/O
24
XL1
Analog input
-
MK71521: Test Monitor pin:Connection for 32.768 kHz crystal
(LFXO)Be sure to use this pin open.
P0.00
Digital I/O
Input
MK71521A:"General purpose I/O
25
XL2
Analog input
-
MK71521:Test Monitor pin:Connection for 32.768 kHz crystal
(LFXO)Be sure to use this pin open.
P0.01
Digital I/O
Input
MK71521A:"General purpose I/O
26
P0.08
Digital I/O
Input
"General purpose I/O
27
P0.09
Digital I/O
Input
General purpose I/O
28
P0.10
Digital I/O
Input
General purpose I/O
29
P0.03
Digital I/O
Input
General purpose I/O
30
P0.02
Digital I/O
Input
General purpose I/O
31
GND
Ground
-
Ground PAD
32
GND
Ground
-
Ground PAD
33
P0.05
Digital I/O
Input
General purpose I/O
34
P0.07
Digital I/O
Input
"General purpose I/O
35
RFIO
RF I/O
-
Single-ended radio antenna connection
36
GND
Ground
-
Ground PAD
37
P0.20
Digital I/O
Input
General purpose I/O
38
P0.18
Digital I/O
Input
General purpose I/O
39
P0.14
Digital I/O
Input
General purpose I/O
40
P0.12
Digital I/O
Input
General purpose I/O
41
P0.11
Digital I/O
Input
General purpose I/O
42
GND
Ground
-
Ground PAD
43
GND
Ground
-
Ground PAD
44
SWDCLK
Digital input
Pull-down
Serial Wire Debug clock for Programming and debug
45
SWDIO
Digital I/O
Pull-up
Serial Wire Debug I/O for Programming and debug
46
P0.21
Digital I/O
Input
General purpose I/O
47
P0.19
Digital I/O
Input
General purpose I/O
48
P0.17
Digital I/O
Input
General purpose I/O
49
P0.16
Digital I/O
Input
General purpose I/O
50
P0.15
Digital I/O
Input
General purpose I/O
51
P0.13
Digital I/O
Input
General purpose I/O