Data Sheet

Silicon Labs
Page 11 of 45
PAD# GPIO I2C SPI UART Ethernet Timer USB Analog Prog. Other
2
RB15
CN12
EMDC OCFB AN15
3 RE0 ERXD1
4 RE1 ERXD0
5 RE2 ECRSDV
6 RE3 EREFCLK
7 RE4 ERXERR
10 RE5 ETXEN
11 RE6 ETXD0
12 RE7 ETXD1
14
RB1
CN3
AN1 PGEC1
15
RB0
CN2
AN0 PGED1
17 RB8 SS4 nU2CTES C1OUT AN8
18 RF3 OTG_ID
19
RB14 SCK4 nU2RTS AN14
20
RB13 AN13 TDI
21 RB12 AN12 TCK
22
RB11 AN11 TDO
23
RB10 AN10 TMS
24
RB5
CN 7
VBUSON AN5
27
RG3 (input) D-
28 RG2 (input) D+
29
RD3 SCL3 SDO3 U1TX OC4
30
RC12 OSC1
31 RC15 OSC2
32
RD2 SDA3 SDI3 U1RX OC3
33
RC13
CN 1
SOSCI
34
RC14
CN0
T1CK SOSCO
35
RF4
CN17
SDA5 SDI4 U2RX
36
RF5
CN18
SCL5 SDO4 U2TX
37
RD11
INT4
IC4
38
RD0
INT0
OC1
39
RD4 IC5/OC5
41 RD5
42
RD6
CN15
ETXERR
43
RD7
CN16
44
RD9
INT2
SDA1 SS3 nU1CTS IC2
46
RD10
INT3
SCL1 IC3
47
RD1 SCK3 nU1RTS EMDIO OC2
10TTable 2: Multifunction pad descriptions
10TNote: 5V tolerant pads are marked with orange. CN pins support pull-up, pull-down and GPIO notifications
10TNote: Unused pins should be set up as outputs to reduce leakage currents