UBX-21008123 - R02
Board configuration
Page 23 of 42
C1-Public
4.2
Disconnecting ANNA signals from board peripherals
All evaluation board peripherals, such as level shifters, LEDs, and the interface MCU are connected to
the ANNA-B4 module by default. This might not suit all evaluation scenarios.
All peripherals can be switched off by disconnecting their power supplies , but finer control is needed
to isolate specific signals. Consequently, all ANNA module signals that are connected to board
peripherals are routed through pin headers. In this way, jumpers can be added or removed to isolate
or connect specific signals. Figure 13 shows the layout of the pin headers. See also
Powering options
.
Figure 13: Jumper header connectors J19 and J9 that are used to connect/isolate specific ANNA signals
Connector
Pin no.
Schematic net name
Description
J19
1
RESET_N
ANNA reset signal, active low
2
RESET_N_I
Connects to the Interface MCU’s reset line
3
SWDIO
SWD data signal
4
SWDIO_I
Interface MCU SWD data signal, used to program/debug the ANNA module
5
SWDCLK
SWD clock signal
6
SWDCLK_I
Interface MCU SWD data signal, used to program/debug the ANNA module
7
IO_33
ANNA-B402: GPIO, ANNA-B412: BLUE signal
8
BLUE
RGB diode blue signal, active low
9
IO_32/
SWITCH_1
ANNA-B402: GPIO, can be used as either user LED output or push-button input
ANNA-B412: SWITCH_1 and GREEN signal
10
GREEN
RGB diode green signal, active low
11
IO_31
ANNA-B402: GPIO, can be used as user LED output, ANNA-B412: RED signal
12
RED
RGB diode red signal, active low
J9
1
IO_27/
UART_DTR
ANNA-B402: analog capable GPIO signal
ANNA-B412: UART DTR output
2
UART_DTR_I
UART to USB DTR signal
3
IO_28/
UART_DSR
ANNA-B402: analog capable GPIO signal
ANNA-B412: UART DSR input
J9
J19
J9
J19
12
11
2
1
12
11
2
1
R
E
SE
T
_N
_I
RE
S
ET
_N
SW
D
IO
S
WD
CLK
IO_
3
3
IO
_3
2
/S
W
IT
C
H_1
IO_
3
1
IO
_2
7
/U
A
R
T
_D
TR
IO
_2
8
/U
A
R
T
_D
SR
IO
_3
6
/U
A
R
T
_R
T
S
IO_
3
7
/U
A
R
T
_C
T
S
IO
_19/
U
A
R
T
_T
XD
IO
_2
0
/U
A
R
T
_R
X
D
SW
D
IO
_I
S
WD
CLK
_I
B
L
UE
G
REEN
RED
U
A
R
T
_D
TR
_I
U
A
R
T
_D
SR
_I
U
A
R
T
_R
T
S
_I
UA
R
T
_C
T
S_
I
UA
R
T
_T
X
D_
I
U
A
R
T
_R
X
D
_I
ANNA Signal Jumper Header Connectors
