RFD21733 Datasheet, PDF (29/76 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
switch as much current as you like to drive your external devices such as high brightness LEDs. Note you must
always use a series current limiting resistor when connecting an LED to a pin of course. The outputs are active
high and therefore you can use an NPN transistor or an N channel FET to switch the ground lead of an LED
easily.
Power Saving
When in mode 4,5,6 or 7 receive modes or in mode 2 or 3 Serial UART modes, you will draw 17mA since the
receiver is 100% on all the time. If you need an internal duty cycle set, please contact [e-mail] for
any custom timing you require. However if you wish to have control over this yourself, since the RFDP8 Modules
and RFDANTs are very fast waking (3mS), you can easily use a P-FET or PNP transistor and just simply remove
power from the whole module and then draw ZERO current until you need the module. If you need help doing
this, feel free to contact [e-mail] anytime.
The length of an RFDP8 Standard packet is about 12mS, so if you use a receiver duty cycle of 10%, that will be
on for 30mS and off for 270mS, which will give you a latency of about 300mS and result in a 90% power savings,
yielding a 1.7mA average current consumption. Doing a 1% duty cycle, would bring the average current
consumption to 170uA and latency to 3 seconds.
Custom configurations to fit your application are available, simply email [e-mail]
Pull Ups and Pull Downs for RF Modules, RFDANTs and Eval Boards.
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.
Table for Modules and RFDANTs. ONLY - RFD21733, RFD21735, RFD21742, RFD21743.
RFDANT Module Pin Label
Direction
Pull Up or Pull Down
Pin # Pin #
2
13 +V
Input
+V Power
1
10 GND
Input
Ground
5
16 Mode Select 0
Input
13k ohm pull down for less then 1mS after reset or
after power up. (Inside of Modules and RFDANTs)
6
17 Mode Select 1
Input
NONE
7
3 Mode Select 2
Input
NONE
8
4 TX LED / Status / Learn Input / Output NONE
9
5 IN1 / OUT1 / LOGIC IO Input / Output NONE
10
6 IN2 / OUT2 / RXD
Input / Output NONE
11
7 IN3 / OUT3 / TXD
Input / Output NONE
4
14 RESET
Input
3.3k pull up (Inside of Modules and RFDANTs)
3
15 FACTORY
Input
3.3k pull down. (Inside of Modules and RFDANTs)
Free Applications Support • Email your application questions to [e-mail]
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