GND
V
CC_TA
R
GET
GND
V
CC_TA
R
GET
GND
G
N
D
G
N
D
32kH
z C
ry
st
al
USER LED
V
CC_TA
R
GET
GND
U
SER B
U
TTON
1k 1k
1k
R201
YELLOW LED
SML-
D12Y
1WT86
2
1
D200
TS604VM
1-0
35CR
1
3
4
2
SW
200
GND
GND
GND
GND
GND
SAME51 (Target Device)
2.
2u
F
C207
GND
DBG0
CDC_UART
TX
RX
UART
CDC_TX
CDC_RX
DBG2
DBG1
DBG3
DBG2
DE
B
U
GG
E
R
C
O
NNECT
IO
N
S
DBG1
DBG3
DB
G0
C
D
C
_UAR
T
T
X
RX
UA
RT
DB
G1
DB
G3
DB
G2
DBG0
VOFF
ID_SYS
ID_S
YS
VOFF
2.2
uF
C
20
7
G
N
D
T
A
R
G
ET BU
LK
100k
R200
V
CC_TA
R
GET
100
k
100
k
R20
0
V
C
C_
T
A
R
G
ET
R
E
SET Pull
VB
U
S
J201
J203
J205
J206
J202
J204
NC
V
CC_EDGE
V
CC_EDGE
110R
R202
PB
4_
CON1_7
PB
5_
CON1_6
PB
8_
A
D
C
2
PB
9_
A
D
C
5
PA
4_AD
C
6
PA
5_CON2_
4
PA
20_CON2_2
PA
21_CON2_3
PB22_C
ON
3_2
PB23_C
ON
3_7
PA27_C
ON
2_5
PB31_C
ON
3_1
PB30_SW
O(D
BG
2)
PA31_SW
DIO
(D
BG
0)
PA30_SW
CLK
(D
BG
1)
GND
V
CC_TA
RGET
4.
7u
F
C206
GND
1.
8k
R203
DNP
1.
8k
R204
DNP
V
CC_TA
R
GET
RESETn
PROG/DE
B
U
G
P
u
ll
47
k
47k
R205
47
k
47k
R206
DBG0
DBG1
V
CC_TA
R
GET
PB
17
_CDC-RX-S
5P1
PA
18
_S
PI-C
S-
S1
P2
PB
16
_CDC-T
X
-S5P
0
PA
22_CON2_0(
T
x-
S3
P0)
PB
6_
CON1_5
PB
7_
CON1_4
PA8_CO
N1_0(
Tx-
S0P0)
PA9_CO
N1_1(
Rx-
S0P1)
PA
00_XIN32
PA10_A
DC
3
PA11_A
DC
4
PA
12_I
2C-SDA-
S2P0
PA
13_I
2C-SCL-S2
P1
CDC R
X
3
CDC TX
4
DBG
1
5
DBG
2
6
0 TX
7
1 RX
8
2 SDA
9
3 SCL
10
4 MOSI
11
5 MISO
12
6 SCK
13
7 SS
14
GND
15
0 (TX)
16
1 (RX)
17
2
18
3
19
0
20
GND
24
DBG
3
54
DBG
0
53
GND
52
VCC
51
PWM
3
46
ADC 2
45
ADC 1
44
ADC 0
43
GND
42
4
38
4
34
GND
33
ADC 7
50
ADC 6
49
ADC 5
48
PWM
4
47
DEBUGGER
TA
R
G
E
T
ID
2
VOFF
55
1
21
2
22
3
23
0
25
1
26
2
27
3
28
4
29
5
30
6
31
7
32
5
35
6
36
7
37
5
39
6
40
7
41
R
E
SERVED
1
VBU
S
56
CNANO56-p
in ed
ge co
nne
cto
r
J200
PB12_TxD
-S
4P0
PB10_C
ON
3_5
PB11_C
ON
3_4
PB14_C
ON
1_2
PB15_C
ON
3_3
PB13_R
xD-S
4P1
PA14_LED
PA12_I
2C-S
DA
-S
2P0
PA13_I
2C-S
CL
-S
2P1
PA15_SW
PA
01_XOUT32
PA
2_AD
C
0
PA
3_CON3_
6
PA
6_CON1_
3
PA
7_AD
C
7
V
CC_TA
R
GET
GND
PA
17_S
PI-
SCK-S1
P1
PA16
_S
PI
-MO
SI
-S
1P
0
PB3_A
DC
1
PB2_C
ON
3_0
PB1_C
ON
2_7
PB0_C
ON
2_6
PA
8_CON1_
0(T
x-
S0P
0)
PA
9_CON1_
1(Rx-S0P1
)
PB
12
_Tx
D
-S
4P
0
PB
10
_CON3_
5
PB
11
_CON3_
4
PB
14
_CON1_
2
PB
15
_CON3_
3
PB
13
_RxD
-S4
P1
PA
12_I
2C-SDA-
S2P0
PA
13
_I
2C-SCL-S2
P1
PB
4_
CON1_7
PB
5_
CON1_6
PB
8_
A
D
C
2
PB
9_
A
D
C
5
PA
4_AD
C
6
PA
5_CON2_
4
PB
6_
CON1_5
PB
7_
CON1_4
PA
3_CON3_
6
PA
6_CON1_
3
PA
7_AD
C
7
PA
20_CON2_2
PA
21_CON2_3
PA
19_SPI-
M
ISO-S1P3
PB
17
_CDC-RX-S
5P1
PA
18_SPI-
CS-
S1P2
PB
16
_CDC-T
X
-S
5P
0
PA
23_CON2_1(
R
x-
S3P1)
PA
22_CON2_0(
T
x-S3
P0)
PA
17
_S
PI-
SCK-S1
P1
PA
16_SPI-
M
OSI-
S1P0
PB
22
_CON3_
2
PB
23
_CON3_
7
PA
27_CON2_5
PB
31
_CON3_
1
PB
30
_S
W
O
(D
B
G
2)
PA
31_S
W
D
IO(DBG0)
PA
30
_S
W
C
LK(DBG1)
RESE
T
n
PB
2_
CON3_0
PB
1_
CON2_7
PB
0_
CON2_6
PA00_X
IN
32
PA01_X
OU
T32
PA14_LED
PA15_SW
V
CC_TA
R
GET
GND
PA
23_CON2_1(
R
x-
S3P1)
PA
19_S
PI-
M
ISO-S1P3
PA
25
10
0n
F
C200
10
0n
F
C202
10
0n
F
C201
100n
F
C203
100n
F
C204
100n
F
C205
PA
24
BLM15PD80
0SN1
L200
PA
2_AD
C
0
PB
3_
A
D
C
1
PA
10_A
DC3
PA
11_A
DC4
C209
C208
32
.7
68
kH
z
XC20
0
LQH3NPN100
M
JR
L
L1
DNP
GND
10uH
VSW
V
DDCORE
22pF
22
pF
PA0/XIN32
1
PA1/XOUT32
2
PA2
3
PA3
4
PB4
5
PB5
6
GNDANA
7
VDDANA
8
PB6
9
PB7
10
PB8
11
PB9
12
PA4
13
PA5
14
PA6
15
PA7
16
PA8
17
PA9
18
PA10
19
PA11
20
VDDIO
21
GND
22
PB10
23
PB11
24
PB12
25
PB13
26
PB14
27
PB15
28
PA12
29
PA13
30
PA14/
XIN
31
PA15/
XOUT
32
GND
33
VDDIO
34
PA16
35
PA17
36
PA18
37
PA19
38
PB16
39
PB17
40
PA20
41
PA21
42
PA22
43
PA23
44
PA24
45
PA25
46
GND
47
VDDIO
48
PB22
49
PB23
50
PA27
51
RESET
52
VDDCO
RE
53
GND
54
VSW
55
VDDIO
56
SWCLK
/PA30
57
SWDIO
/PA31
58
PB30
59
PB31
60
PB0
61
PB1
62
PB2
63
PB3
64
SA
ME51
J2
0A
-MU-EFP
U200
(6
4 Q
FN
)
Crys
ta
l d
at
as
he
et
:
Ccry
sta
l = 12.5p
F
m
ax
ESR = 70
kOhm
A
ccurac
y
±
20
pp
m
SA
ME
51
d
ata
sh
ee
t:
Cxin = 3.1pF
Cxout = 3.2pF
Cl
≈
1/(
(1/3
.1pF)
+
(1/
3.1pF) )
≈
1.57p
F
M
ax
im
um
Load
= 12.5pF
M
ax
im
um
ESR = 90
kOhm
Esti
m
ated
Cpcb
= 0.5pF
Esti
m
ated load
CLEXT = 2 (Cl-Cpar
a-Cpcb_Cshunt)
C = 2 (12.5p
F - 1.574
5pF
-
0.
5pF-
1.05p
F)
C = 18.75pF
N
OTE
o
n UART/
C
DC:
RX/T
X on
the he
ade
r den
ote
s the
inpu
t/o
utp
ut di
rec
tio
n of th
e sig
nal
re
spect
iv
e to it
's source.
C
D
C
T
X
is
ou
tp
ut
f
ro
m
th
e DEBUGGER.
CDC RX is inp
ut to
the DEBUGGER.
T
X
is
outp
ut fr
om
the
T
A
RGET dev
ic
e.
RX is input
to the TA
RGET dev
ice.
N
O
T
E on CDC:
T
X
an
d RX cr
oss
here
.
EV76S68A
Schematics
©
2020 Microchip Technology Inc.
User Guide
DS70005432A-page 17
