Uart / I2C Serial Interface; Uart (Rx / Tx); I2C (Scl / Sda) - Sierra Wireless AirPrime XS1110 Product Technical Specification

Product Technical Specification
Rev 4.0 Jul.20

UART / I2C Serial Interface

UART (RX / TX)

1. UART is the TTL level interface that carries baud rate at 115200 bps or
460800 bps.
2. Placing a damping resistor in series on the RX and TX trace of the module
could reduce noise from the host MCU or high speed digital logics. Fine-
tuning the damping resistor is required to efficiently suppress noise. The
damping resistor is a wire-wound component and may function as a choke
coil.
3. Don't connect diode(s) to RX/TX as it will decrease the signal driving
capability which might adversely affect the RX/TX signal level. In some cases
no data output will occur.
4. If RS232 logic-level is needed, a level shifter should be used. For more infor-
mation refer to UART to RS232
5. If USB logic-level is needed, refer to

I2C (SCL / SDA)

1. The I2C interface is convenient for system integration. Sony CXD5605GF
only supports slave mode (default slave address is 0x24). The bit rate is up to
1Mbit/s for fast mode plus (default Normal mode is 100 kbit/s). Additionally,
the XS1110 supports manual or automatic indicator for data transfer in slave
mode.
2. Pull-up resistors must be added for the I2C bus as shown below:
Figure 5-2: I2C Pull Up Resistors
38
Interface.
UART to USB Interface.
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