Data Sheet
BMD-345 - Data sheet
UBX-19039908 - R07 Electrical specifications Page 14 of 36
Mode
Pin
Name
Connection
Normal
17
65
VCC
VCC
2.0 V to 3.6 V DC
Table 8: Power mode pin connections
3.3.1 USB power
The USB interface on the BMD-345 can be used when the module is in Normal mode. The BMD-345
USB PHY is powered by a dedicated, internal LDO regulator that is fed by VBUS, pin 66.
⚠ Applying power to only the VBUS pin will not power the rest of the module. In order for the USB
PHY to operate, VBUS must be externally powered.
3.4 General purpose I/O
The general purpose I/O is organized as two ports enabling access and control of the 44 available GPIO
pins (4 GPIO are reserved for PA / LNA control). The first port allows access to P0.00 to P0.31, similar
to the first port on the BMD-300/301. The second port, new to the BMD-345, allows access to P1.00
to P1.15. Each GPIO can be accessed individually with the following user configurable features:
Input/output direction
Output drive strength
Internal pull-up and pull-down resistors
Wake-up from high- or low-level triggers on all pins
Trigger interrupt on all pins
All pins can be used by the PPI task/event system; the maximum number of pins that can be
interfaced through the PPI at the same time is limited by the number of GPIOTE channels
All pins can be individually configured to carry serial interface or quadrature demodulator signals
Pins P1.02, P1.04, P1.05, and P1.06 are reserved for PA / LNA control.
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
IH
Input High Voltage
0.7 x VCC
-
VCC
V
V
IL
Input Low Voltage
GND
-
0.3 x VCC
V
V
OH
Output High Voltage
VCC − 0.4
-
VCC
V
V
OL
Output Low Voltage
GND
-
GND + 0.4
V
R
PU
Pull-up Resistance
11
13
16
kΩ
R
PD
Pull-down Resistance
11
13
16
kΩ
Table 9: GPIO electrical specifications
3.5 Module reset
GPIO pin P0.18 may be used for a hardware reset. In order to utilize P0.18 as a hardware reset, the
UICR registers PSELRESET[0] and PSELRESET[1] must be set alike, to the value of 0x7FFFFFD2.
When P0.18 is programmed as RESET, the internal pull-up is automatically enabled. Nordic
Semiconductor example applications and development kits program P0.18 as RESET_N.
3.6 Debug and programming
The BMD-345 supports the two pin Serial Wire Debug (SWD) interface and offers flexible and powerful
mechanism for non-intrusive debugging of program code. Breakpoints, single stepping, and
instruction trace capture of code execution flow are part of this support.