RFD21733 Datasheet, PDF (39/76 Pages) List of Unclassifed Manufacturers – Compliance Approved 2.4 GHz RF Transceiver Modules with Built-In RFDP8 Application Protocol

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7/10/2011 1:40 AM
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RFD21733 • FCC • IC
RFD21743 • FCC
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RFDP8
RF Module
RFD21733
RFD21735
RFD21737
RFD21738
RFD21739
RFDP8
RFDANT
RFD21742
RFD21743
RFD21772
RFD21773
KEYFOBs
The following timing diagrams show the operation of a logic transmitter and a logic receiver with the different hang
time options.
In the first diagram, the logic transmitter’s inputs are all asserted, and then sequentially de-asserted. There is a
small delay between the transmitter input going high and the corresponding output on the receiver going high, due
to the time required to transmit over the air.
Note that when the last input on the transmitter is de-asserted, there is a 500ms delay before the receiver de-
asserts its last output.
The second diagram shows the same operation at the transmitter, but with the receiver configured with a 20ms
hang time.
Note that shortly after the last input is de-asserted, the receiver updates its output state to turn off all outputs.
Communication between UART and Switch Logic Receiver/Transmitter
The Logic Receiver and Transmitter modes are able to communicate with a module operating in one of the UART
modes, which opens up a wide range of possible applications involving PC’s or embedded systems with serial
communications capability.
Logic Transmitter to UART
A Logic Transmitter (whether RFID or not) sends the state of its inputs as a single byte of data, followed by its
ESN as four bytes. A Mode 2 or Mode 3, Module or RFDANT in Serial UART can receive this packet and output
it as a binary stream to a PC serial port or an embedded microcontroller. The format of the data is:
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