Hardware User Manual
RFCOM Technologies
RTBTM01 BLE Module
Page 12 of 30
5.3 Application Interface
5.3.1 Communication at same potential (V
DD
)
5.3.1.1 UART interfaces
RTBTM01
User
MCU/Host
RxD
TxD
TxD0
RxD0
Pin7
Pin8
Figure 5-2
UART mode connection diagram at same potential
5.3.1.2 Simplified I2C interface
RTBTM01
User
MCU/Host
S CL
S DA
S CL 0
S DA 0
P in19
P in20
4K7*
V DD
4K7*
Figure 5-3
Typical pull-up resistor for I2C mode connection at same potential
The recommended typical pull-up resistor value 4.7K
Ω varies subject to designed communication line (SDA0,
SCL0) load capacitance and operation clock frequency at different speed mode.
