Data Sheet
BMD-345 - Data sheet
UBX-19039908 - R07 Electrical specifications Page 13 of 36
3 Electrical specifications
⚠ Stressing the device above one or more of the ratings listed in the Absolute maximum rating
section may cause permanent damage. These are stress ratings only. Operating the module at
these or at any conditions other than those specified in the Operating conditions section of this
document should be avoided. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
☞ Operating condition ranges define those limits within which the functionality of the device is
guaranteed. Where application information is given, it is advisory only and does not form part of
the specification.
3.1 Absolute maximum ratings
Symbol
Description
Min
Max
Unit
V
CC_MAX
Voltage on VCC supply pin
−0.3
3.9
V
V
BUS_MAX
Voltage on VBUS supply pin
−0.3
5.8
V
V
IO_MAX
Voltage on GPIO pins (V
CC
> 3.6V)
−0.3
3.9
V
V
IO_MAX
Voltage on GPIO pins (V
CC
≤ 3.6V)
−0.3
V
CC
+ 0.3 V
V
T
S
Storage Temperature Range
−40
125
°C
Table 6: Absolute maximum ratings
⚠ The product is not protected against overvoltage or reversed voltages. If necessary, voltage spikes
exceeding the power supply voltage specification, given in table above, must be limited to values
within the specified boundaries by using appropriate protection devices.
3.2 Operating conditions
☞ Unless otherwise specified, all operating condition specifications are at an ambient temperature
of 25 °C and a supply voltage of 3.3 V.
Operation beyond the specified operating conditions is not recommended and extended exposure
beyond them may affect device reliability.
Symbol
Parameter
Min
Typ.
Max
Unit
V
CC_IN
VCC operating supply voltage in
2.0
3.0
3.6
V
V
BUS_IN
VBUS operating supply voltage in
4.35
5.0
5.5
V
T
R_VCC
VCC Supply rise time (0 V to 1.7 V)
-
-
60
ms
T
A
Operating Ambient Temperature Range
−40
25
85
°C
Table 7: Operating conditions
☞ The BMD-345 is based on the nRF52840, revision 2 or newer IC.
3.3 Power configuration
The nRF52840 IC within the BMD-345 module has two internal regulator stages, REG0 and REG1,
that each contain an LDO and DCDC regulator. Only the LDO regulator REG1 is utilized in the BMD-
345. Pins 17 and 65 are connected within the module, which bypasses REG0. Both pins 17 and 65
should be connected on the host board. REG1 supplies power to the module core and can accept an
input source voltage of 2.0 V to 3.6 V, placing the module in Normal mode. The voltage present on the
VCC pins are always the GPIO high logic level voltage.