UM-B-114
DA14531 Development Kit Pro Hardware User Manual
User Manual
Revision 1.4
23-Apr-2020
19 of 82
© 2021 Dialog Semiconductor
Figure 13: USB to UART (U12)
4.2.3
USB to JTAG (U4)
The USB to JTAG function is implemented by U4, SAM3U2CA. On the ROM of U4, software from
SEGGER is loaded. Its operation is indicated via the green LED D2 on the DA14531 PRO-MB. This
chip is supplied with 3.3 V from U14. U14 is enabled by the PWR_ENABLE signal.
Functions served by U4 include:
●
Connecting a PC to the JTAG port of DA14531 SoC
●
Reset capability of the DA14531 SoC through the T_RESET signal
OSC_EN
TP58
OSC_EN
R152
51
TP64
BCBUS5
TP59
BCBUS7
R114
51
R61
51
AD_SCLK
R63
51
AD_DI
AD_MODE
AD_DO
R68
51
AD_SY NC
R67
51
Y 4
12.0000MHZ
R81
NP
C74
18pF
C67
18pF
C55
100nF
C54
10uF
T_RESET
C46
100nF
C45
10uF
3.3V
3.3V
LP6
500mA_470 OHM
C48
100nF
C47
100nF
C49
100nF
VREG
C50
100nF
C51
100nF
C52
100nF
C53
100nF
R65
1.00K
AD_DRDY
3.3V
R82
51
3.3V
C61
4.7uF
C60
100nF
R52
33
R53
33
TP18
VREG
R57
12.0k
LP7
500mA_470 OHM
U12
FT2232HL
VPH
Y
4
OSCO
3
OSCI
2
AGN
D
10
DM
7
DP
8
TEST
13
VPLL
9
VC
OR
E
12
VC
OR
E
37
VC
OR
E
64
VC
C
IO
20
VC
C
IO
31
VC
C
IO
56
VC
C
IO
42
GN
D
1
GN
D
5
GN
D
11
GN
D
15
GN
D
25
GN
D
35
GN
D
47
GN
D
51
ADBUS0
16
ADBUS1
17
ADBUS2
18
ADBUS3
19
ADBUS4
21
ADBUS5
22
ADBUS6
23
ADBUS7
24
ACBUS0
26
ACBUS1
27
ACBUS2
28
ACBUS3
29
ACBUS4
30
ACBUS5
32
ACBUS6
33
ACBUS7
34
BDBUS0
38
BDBUS1
39
BDBUS2
40
BDBUS3
41
BDBUS4
43
BDBUS5
44
BDBUS6
45
BDBUS7
46
BCBUS0
48
BCBUS1
52
BCBUS2
53
BCBUS3
54
BCBUS4
55
BCBUS5
57
BCBUS6
58
BCBUS7
59
VREGIN
50
VREGOUT
49
RESET
14
PWREN
60
SUSPEND
36
EECS
63
EECLK
62
EEDATA
61
REF
6
U_CTS
U_RTS
U_TX
U_RX
To
voltage
translator
(UART)
To U11
USB HUB
To current
sense
USB SERIAL/SPI INTERFACE