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EULUM DESIGN LLC 6131 • Kellers Church Road • Pipersville • PA • 18947 • USA
EULUM DESIGN LTD Unit 4 • Zone D •Chelmsford Road Ind. Est • Dunmow • CM6 1XG • UK
www.eulum.com
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UK: [phone]
USA: [phone]
RFM-CSB-3
c. I2C
This two-wire interface uses clock (SCL) and bidirectional data (SDA). The protocol makes it
possible to interconnect up to 128 individually addressable devices. The interface is capable
of clock stretching and data rates of 100 kbps and 400 kbps are supported.
The GPIOs used for each Two-Wire Interface line can be chosen from any GPIO on the module
and are independently configurable.
d. UART
The Universal Asynchronous Receiver/Transmitter offers fast, full-duplex, asynchronous serial
communication with built-in flow control (CTS, RTS) support in HW up to 1 Mbps baud. Parity
checking and generation for the 9th data bit are supported.
The GPIOs used for each UART interface line can be chosen from any GPIO on the module and
are independently configurable.
e. GPIO
Each of the four I/O can also be configured for alternate input/output functions. Casambi
supported functions include:
• Pushbutton input • Relay control output • Zero Detect Input • Fixed “idle” state output
The I/O can be further tailored using options such as:
• Input/output polarity • Output drive strength • Internal pull-up and pull-down resistors