Data Sheet

BMD-345 - Data sheet
UBX-19039908 - R07 Pin definition Page 11 of 36
No.
Name
I/O
Description
nRF52 pin
Remarks
66
VBUS
Power
USB PHY supply:
4.35 V to 5.5 V in Connect to
USB Host device 5 V supply
VBUS
67
USB-D−
I/O
USB Data−
D–
68
USB-D+
I/O
USB Data+
D+
69
GND
Power
Electrical Ground
70
GND
Power
Electrical Ground
71
GND
Power
Electrical Ground
72
GND
Power
Electrical Ground
73
RESERVED
RESERVED
RESERVED
Reserved for future use. Leave floating.
74
GND
Power
Electrical Ground
Table 2: BMD-345 pin-out
2.2 Peripheral pins
The BMD-345 features a pin multiplexing system that allows most internal peripherals, such as UART
and SPI, to be used on any GPIO pin. This freedom in pin choice enables better optimization of designs
and PCB layout.
☞ Only one peripheral signal can be multiplexed to a GPIO pin at a time. Some functions are restricted
to certain pins due to additional internal circuitry required by the interface. These include: Trace
signals, analog inputs, XTAL signals, USB signals, SWD interface, and reset. See Table 3.
Peripheral
Signal
Pin Options
UART0, UART1,
I2C0, I2C1,
SPI0, SPI1, SPI2, SPI3,
I2S0, QSPI0, PDM0,
PWM0, PWM1, PWM2, PWM3
All
P0.00-P0.31, P1.01, P1.03,P1.07-P1.15
ADC, COMP, LPCOMP
All
P0.02-P0.05, P0.28-P0.31 (AIN0-AIN7)
NFC
NFC1
NFC2
P0.09
P0.10
Reset
RESET
P0.18
Trace
TRACECLK
SWO/TRACEDATA[0]
TRACEDATA[1]
TRACEDATA[2]
TRACEDATA[3]
P0.07
P1.00
P0.12
P0.11
P1.09
SWD
SWD Clock
SWD IO
SWCLK
SWDIO
32.768 kHz Crystal
XTAL1
XTAL2
P0.00
P0.01
USB
USB Data +
USB Data −
USB-D+
USB-D−
Table 3: Peripheral pin options
☞ Some peripherals on the BMD-345 share the same memory location for their registers. This means
that only one of these peripherals can be used at a time. It is possible to switch between
peripherals that share the same register location by clearing and reinitializing the associated
configuration registers. See Nordic Semiconductor nRF52840 Product Specification for details.
Peripheral ID
Base Address
Shared Peripherals