RFD21733 Datasheet, PDF (32/76 Pages) List of Unclassifed Manufacturers – Compliance Approved 2.4 GHz RF Transceiver Modules with Built-In RFDP8 Application Protocol

© Copyright, RF Digital
7/10/2011 1:40 AM
Patents Pending
RoHS CE • ESTI
RFD21733 • FCC • IC
RFD21743 • FCC
Approved & Certified
13715 Alton Pkwy • Irvine • CA • 92618
Tel: [phone] • www.RFdigital.com
Fast Answers: [e-mail]
RFDP8
RF Module
RFD21733
RFD21735
RFD21737
RFD21738
RFD21739
RFDP8
RFDANT
RFD21742
RFD21743
RFD21772
RFD21773
KEYFOBs
Mode 1 – Input Logic Transmitter
RFDANTModule Pin Label
Pin # Pin #
2
13 +V
1
10 GND
5
16 Mode Select 0
6
17 Mode Select 1
7
3 Mode Select 2
8
4 TX LED
9
5 IN1
10
6 IN2
11
7 IN3
Direction Function
Input
Input
Input
Input
Input
Output
Input
Input
Input
+V Power
Ground
Tie to +V
Tie to GND
Tie to GND
Toggles high during transmission (1 blink every 15 milliseconds)
Active high switch input #1 (optional) if not used, pull to GND.
Active high switch input #2 (optional) if not used, pull to GND.
Active high switch input #3 (optional) if not used, pull to GND.
When all three switch inputs are low, the module does not transmit, but remains in an ultra-low-power state
consuming only 2uA.
When any of the three switch inputs go high, the module transmits the state of all three inputs. As long as any of
the three inputs remain high, the module continues to transmit the state of all three inputs every 15ms, while
transmitting it will draw about 15mA.
You can also tie any of the three inputs to +V and then connect a switch between +V of the module and your
supply, then once you apply +V to the module it will instantly transmit as fast as possible. This method can be
used to consume zero current when not in use such as in the case of garage door openers or keyfobs and can be
used for many years without consuming any current at all.
The Reset Pin has a 3.3k Pull Up, internal to the Module and RFDANT.
The Factory Pin has a 3.3k Pull Down, internal to the Module and RFDANT.
There are no internal pull ups or pull downs on any other pins except for “Mode Select 0”, which has an internal
13k pull down temporarily applied when the device comes out of reset or after power up for about less then a
millisecond. All other pull downs or pull ups must be applied by you, externally to the Module or RFDANT. If you
are using the RFD Eval Boards (RFD21737, RFD21738, RFD21739, RFD21772, RFD21773) there are 47k pull
downs on these Eval Boards, see the Eval Board Schematic for reference on Pull Downs and which Pins they on.
Always send screen captures of your schematics and layouts to [e-mail] for review.
Mode 2 – 9600 baud UART – Serial Transceiver
RFDANTModule Pin Label
Pin # Pin #
2
13 +V
1
10 GND
5
16 Mode Select 0
6
17 Mode Select 1
7
3 Mode Select 2
8
4 Not Used
9
5 Logic IO
10
6 RXD
11
7 TXD
Direction Function
Input
Input
Input
Input
Input
Output
I/O
Output
Input
+V Power
Ground
Tie to GND
Tie to +V
Tie to GND
Do not connect, not used. Must be left open.
Bidirectional switch logic I/O, if not used then must be pulled to
ground through a 47k resistor. Also, must have series a
resistor.
RX Data Out, UART output of received data. 9600-8N1
TX Data In, UART input of data to transmit. 9600-8N1
Free Applications Support • Email your application questions to [e-mail]
32