Data Sheet

BMD-341 - Data sheet
UBX-19033643 - R03 Pin definition Page 11 of 36
No.
Name
I/O
Description
nRF52 pin
Remarks
Connect to USB Host device 5
V supply
65
VCCH
Power
LV Mode: Connect to VCC
HV Mode: 2.5 V to 5.5 V in
VCCH
An internal 4.7 µF bulk capacitor is included on
the module. However, it is good design practice to
add additional bulk capacitance as required for
your application, i.e. those with heavy GPIO usage
and/or current draw.
Table 1: BMD-341 pin-out
1: In HV mode, VCC acts as a regulated supply that can power other external devices. The voltage output of VCC can be
configured in software but is limited to no more than VCCH-0.3 V. In System Off mode, VCC can supply no more than 1mA.
2.2 Peripheral pins
The BMD-341 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. Note that 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 2 for details:
Peripheral
Signal
Pin Options
UART0, UART1,
I2C0, I2C1,
SPI0, SPI1, SPI2, SPI3,
I2S0, QSPI0, PDN0,
PWM0, PWM1, PWM2, PWM3
All
P0.00-P0.31, P1.00-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_N
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 2: Peripheral pin options
☞ Some peripherals on the BMD-341 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 sharing a register location by clearing and reinitializing the associated configuration
registers. See the Nordic Semiconductor nRF52840 Product Specification for details.
Peripheral ID
Base Address
Shared Peripherals
3
0x40003000
SPI0
I2C0
4
0x40004000
SPI1
I2C1
Table 3: Peripherals with shared registers