EVK-ANNA-B112 - User Guide
UBX-18018539 - R01
Product description
Page 15 of 29
Figure 14 shows the layout of the Raspberry Pi interface and Table 10 explains the pinout in detail.
There are three mounting holes that can be used for increased mechanical stability. The two on
either side of connector J14 are common to all Raspberry Pi boards, but the third one is only
compatible with the Pi Zero boards.
Conn. Pin
No.
Raspberry
Pi pin
Description
Schematic
net name
nRF52
pin
Alternate functions and notes
J14
1
3.3 V
3.3 V supply pin
3V3_PI
-
Not connected by default, see section 1.6
2
5 V
5 V supply pin
5V
-
Cannot be used as supply input. Supplied
by USB VBUS and protected from back
powering.
3
IO02
Digital I/O
IO_14
P0.15
4
5 V
5 V supply pin
5V
-
Cannot be used as supply input. Supplied
by USB VBUS and protected from back
powering.
5
IO03
Digital I/O
IO_15
P0.16
6
GND
Ground
GND
GND
7
IO04
Digital I/O
N/C
8
IO14
Digital I/O, UART TX/RX
RASP_TXD P0.02 Connected to ANNA UART_RXD pin by
default, see section 1.8.2
9
GND
Ground
GND
GND
10
IO15
Digital I/O, UART RX/TX
RASP_RXD P0.03 Connected to ANNA UART_TXD pin by
default, see section 1.8.2
11
IO17
Digital I/O
N/C
12
IO18
Digital I/O
RESET_N
P0.21
13
IO27
Digital I/O
IO_13
P0.14
14
GND
Ground
GND
GND
15
IO22
Digital I/O
IO_17
Can be connected to IO_17 via zero
Ω
resistor. Resistor not mounted by
default. IO_17 is connected to 32.768 LPO
crystal by default
16
IO23
Digital I/O
IO_16
P0.18
17
3.3 V
3.3 V supply pin
3V3_PI
-
Not connected by default, see section 1.6
18
IO24
Digital I/O
IO_18
19
IO10
Digital I/O
IO_25
P0.31
20
GND
Ground
GND
GND
21
IO09
Digital I/O
IO_21
P0.09 Can be connected to IO_21 via zero
Ω
resistor. Resistor not mounted by default.
IO_21 is connected to NFC antenna by
default
22
IO25
Digital I/O
IO_22
P0.10
Can be connected to IO_22 via zero
Ω
resistor. Resistor not mounted by default.
IO_22 is connected to NFC antenna by
default
23
IO11
Digital I/O
IO_23
P0.05
24
IO08
Digital I/O
IO_24
P0.04
25
GND
Ground
GND
GND
26
IO07
Digital I/O
IO_26
P0.30
27
ID_SD
EEPROM config I2C data
signal
IO_27
P0.29
Should only be used to read or simulate
HAT EEPROMs, see section 1.8.3
28
ID_SC
EEPROM config I2C clock
signal
IO_28
P0.28 Should only be used to read or simulate
HAT EEPROMs, see section 1.8.3
29
IO05
Digital I/O
IO_29
P0.27
