User's Manual

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FIBOCOM B830-GL Hardware User Manual_HP Customization Version Page 19 of 29
Pin
Pin Name
I/O
Pin Description
Type
28
I2C_INT#
I
I2C serial data signal, internal 10KΩ pull-up.
3.3V
External host can control module with I2C interface, the connection schematic design is as Figure 3-4:
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.