User's Manual

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FIBOCOM B830-GL Hardware User Manual_HP Customization Draft Version Page 19 of 28
Figure 3-4 I2C Signal Connection
Note:
I2C interface can be left floating if not used.
3.5 Piezo
The B830 has a piezoelectric element that can be used to output simply sounds.
nRF52840 pin Pin Name I/O Pin Description Type
P0.08 PIEZO_PWM_NEG O
Bridge output signal(Phase difference of 180°),
output PWM signal to drive piezo buzzer
3.3V
P1.08 PIEZO_PWM_POS O
Bridge output signal(Phase difference of 180°),
output PWM signal to drive piezo buzzer
3.3V
Module has a built-in DCDC boost circuit which has 4 level V
PP
voltage, then it can drives buzzer output
four volume level.
Volume Level
nRF52840 Pin
V
PP
Voltage
P0.07 P1.15 P1.14
1(Mute) H NC NC
-0.3～0.3V, typical 0V
2(Normal) H H L 13.5~17.5V, typical 15.5V
3(Medium) H L H 20.5~24.5V, typical 22.5V
4(Loud) H H H 28~32V, typical 30V