Data Sheet

BMD-341 - Data sheet
UBX-19033643 - R03 Electrical specifications Page 16 of 36
Normal/Low Voltage (LV) or High Voltage (HV). The voltage present on the VCC pin is always the GPIO
high logic level voltage, regardless of power mode.
To enter LV Mode, the same source voltage is applied to both the VCC and VCCH pins causing REG0
to automatically shut down leaving only the REG1 stage active. To enter HV, the source voltage is only
applied to VCCH causing the VCC pin to become an output source supplied by REG0.
Mode
Pin
Name
Connection
Normal (LV)
17
65
VCC
VCCH
1.7 V to 3.6 V source in
Same source as VCC
High Voltage (HV)
17
65
VCC
VCCH
1.8 V to 3.3 V supply out
2.5 V to 5.5 V source in
Table 7: Power mode pin connections
⚠ Important: In both LV and HV mode, the GPIO logic level voltage is determined by the VCC pin. In
HV mode, all external devices that are connected to the BMD-341’s GPIO must either be powered
by the module (from VCC) or use level translation.
REG0 can supply a maximum current of 25 mA for the module and external circuits in System On
Mode and 1 mA in System Off Mode. External circuits powered from VCC in HV mode should be limited
to no more than 5 mA to ensure stability at all radio transmit power levels.
3.3.1 USB power
The USB interface on the BMD-341 can be used when the module is in either Normal (LV) or High
Voltage (HV) mode. The BMD-341 USB PHY is powered by a dedicated, internal LDO regulator that is
fed by the VBUS pin (66). This means that 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.
3.3.2 Normal (LV) power mode examples
Figure 7: BMD-340/341 LV Mode w/ Coin Cell Example