RFD21733 datasheet(38/76 Pages) ETC2

38 / 76 page

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RFDP8

7/10/2011 1:40 AM

Patents Pending

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 7 – Switch Receiver with Logic Output (20ms hang-time) (Network)

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 +V

Mode Select 2

Input

Tie to +V

Learn / Status

I/O

Pulse high through a 220 ohm series resistor to enter learn mode.

LED Learn Status Output. Must be pulled to ground through a 47k

resistor and must have series a resistor.

OUT1

Output

Active high switch output #1, 20 millisecond hang-time.

OUT2

Output

Active high switch output #2, 20 millisecond hang-time.

OUT3

Output

Active high switch output #3, 20 millisecond hang-time.

Fast Switch Latency

The RF Modules and RFDANTs with their patent pending RFDP8 interference tolerant protocol have fast

response times. When using a Mode 0 or 1 transmitter and a Mode 4, 5, 6 or 7 receiver, from the time the

transmitter switch input goes high, the receiver output will go high as fast as 5 milliseconds later. It might take as

long as 12mS, but most of the time it is closer to the 5mS time frame.

In Mode 4, Mode 5, Mode 6 and Mode 7, the Module or RFDANT is always in switch receiving mode.

The receiver drives its outputs to match the values received in a packet from a transmitter. This allows up to 8

possible (2

3) combinations on the receiver’s outputs.

The term Hang-Time means the period the output will stay high after it has been turned on. It will stay on for the

duration of the hang time, waiting on another packet to be received, if no other packet is received it will go low

after the hang-time period. If a packet is received within the hang-time period it will continue to stay high again for

that period of the hang-time setting (either 20mS or 500mS). If repetitive packages are received within the hang-

time window then the output which was high, will continue to stay high as long as that same input is kept high at

the transmitting radio or Serial transmitter which sent the packet.

Hang time is a trade-off between off-time-latency and resiliency to packet loss. With all RF systems sometimes a

packet will be lost, especially as the distance between the transmitter and the receiver grows. If an output is

connected to a relay driver, packet loss will result in chattering on the relay, which will not have good results. The

500ms hang time is perfect for applications like a keyless entry system or a garage door opener.

For faster switching to the “all off” state, the 20ms hang time is preferred. Since a transmitter sends new data

every 15ms, the time delay to turn off all outputs is only 5ms more than to update the outputs to a different state

where at least one of them is still driven high.

RFD21733 Datasheet(PDF) 38 Page - List of Unclassifed Manufacturers

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