Datasheet
DocID17050 Rev 9 41/175
STM32F21xxx Pinouts and pin description
174
Figure 12. STM32F21x LQFP176 pinout
1. RFU means “reserved for future use”. This pin can be tied to V
DD
,V
SS
or left unconnected.
2. The above figure shows the package top view.
PDR_ON
V
DD
PE1
PE0
PB9
PB8
BOOT0
PB7
PB6
PB5
PB4
PB3
PG15
V
DD
V
SS
PG14
PG13
PG12
PG11
PG10
PG9
PD7
PD6
V
DD
V
SS
PD5
PD4
PD3
PD2
PD1
PD0
PC12
PC11
PC10
PI7
PI6
PE2
V
DD
PE3
V
SS
PE4
PE5
PA13
PE6
PA12
VBAT
PA11
PI8-RTC_AF2
PA10
PC14-OSC32_IN
PA9
PC15-OSC32_OUT
PA8
PF0
PC9
PF1
PC8
PF2
PC7
PF3
PC6
PF4
V
DD
PF5
V
SS
V
SS
PG8
V
DD
PG7
PF6
PG6
PF7
PG5
PF8
PG4
PF9
PG3
PF10
PG2
PH0-OSC_IN
PD15
PH1-OSC_OUT
PD14
NRST
V
DD
PC0
V
SS
PC1
PD13
PC2
PD12
PC3
PD11
V
SSA
PD10
V
DD
PD9
V
REF+
PD8
V
DDA
PB15
PA0-WKUP
PB14
PA1
PB13
PA2
PB12
PA3
V
SS
V
DD
PA4
PA5
PA6
PA7
PC4
PC5
PB0
PB1
PB2
PF11
PF12
VSS
V
DD
PF13
PF14
PF15
PG0
PG1
PE7
PE8
PE9
V
SS
V
DD
PE10
PE11
PE12
PE13
PE14
PE15
PB10
PB11
V
CAP_1
V
DD
176
175
174
173
172
171
170
169
168
167
166
165
164
163
162
161
160
159
158
157
156
155
154
153
141
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
80
LQFP176
152
151
150
149
148
147
146
145
144
143
142
69
70
71
72
73
74
75
76
77
78
79
26
27
28
29
30
31
32
33
34
35
36
107
106
105
104
103
102
101
100
99
98
89
ai15972e
V
CAP_2
PI4
PA15
PA14
V
DD
V
SS
PI3
PI2
PI5
140
139
138
137
136
135
134
133
PH4
PH5
PH6
PH7
PH8
PH9
PH10
PH11
88
81
82
83
84
85
86
87
PI1
PI0
PH15
PH14
PH13
V
DD
V
SS
PH12
96
95
94
93
92
91
90
97
37
38
39
40
41
42
43
44
PC13-RTC_AF1
PI9
PI10
PI11
V
SS
V
DD
PH2
PH3