RFD21733 datasheet(32/76 Pages) ETC2

32 / 76 page

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RFDP8

7/10/2011 1:40 AM

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RoHS CE • ESTI

RFD21733 • FCC • IC

RFD21743 • FCC

Approved & Certified

RF Module

RFD21733

RFD21735

RFD21737

RFD21738

RFD21739

RFDP8

RFDANT

RFD21742

RFD21743

RFD21772

RFD21773

KEYFOBs

Mode 1 – Input Logic Transmitter

RFDANT

Pin #

Module

Pin #

Pin Label

Direction Function

Input

+V Power

GND

Input

Ground

Mode Select 0

Input

Tie to +V

Mode Select 1

Input

Tie to GND

Mode Select 2

Input

Tie to GND

TX LED

Output

Toggles high during transmission (1 blink every 15 milliseconds)

IN1

Input

Active high switch input #1 (optional) if not used, pull to GND.

IN2

Input

Active high switch input #2 (optional) if not used, pull to GND.

IN3

Input

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 support@rfdigital.com for review.

Mode 2 – 9600 baud UART – Serial Transceiver

RFDANT

Pin #

Module

Pin #

Pin Label

Direction Function

Input

+V Power

GND

Input

Ground

Mode Select 0

Input

Tie to GND

Mode Select 1

Input

Tie to +V

Mode Select 2

Input

Tie to GND

Not Used

Output

Do not connect, not used. Must be left open.

Logic IO

I/O

Bidirectional switch logic I/O, if not used then must be pulled to

ground through a 47k resistor.

Also, must have series a

resistor.

RXD

Output

RX Data Out, UART output of received data. 9600-8N1

TXD

Input

TX Data In, UART input of data to transmit. 9600-8N1

RFD21733 Datasheet(PDF) 32 Page - List of Unclassifed Manufacturers

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