User's Manual

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11
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RF Digital Corp.
9/2/2010 12:02 PM
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RFDP8
RFDANT
RFD21743
Eval Board
RFD21773
Modes
Mode 0 – Active RFID Transmitter
Pin # Pin Label Direction Function
13 +V Input +V Power
10 GND Input Ground
16 Mode Select 0 Input Tie to GND
17 Mode Select 1 Input Tie to GND
3 Mode Select 2 Input Tie to GND
4 TX LED Output Toggles high during transmission (1 blink every 2 seconds)
5 IN1 Input Active high switch input #1 (optional) if not used, pull to GND.
6 IN2 Input Active high switch input #2 (optional) if not used, pull to GND.
7 IN3 Input Active high switch input #3 (optional) if not used, pull to GND.
The Active RFID Transmitter transmits a packet with its ESN every 2 seconds when the three inputs are all at a
low logic level. If any of the three inputs go high, the module transmits the state of all three inputs every 15 ms,
until all three inputs are low. The logic inputs should be tied low if they are not used in the end application.
The module is active during transmit for 15ms, but remains in an ultra-low power mode for the rest of the 2
second interval. The average power over time is measured in microamps, such that a CR2032 battery should
provide about 60 days of continuous use.
During the 15ms transmission times the current consumption is about 15mA and during the roughly 2 seconds the
current is about 2uA.
If you determine that you need a different period of transmission other then the 2 seconds, a shorter period or a
longer period, then simply use Mode 1 shown below and use your own controller to pulse one of the 3 inputs at
the desired period and it will perform exactly the same function as the RFID transmitter Mode 0.
If longer periods of use are required, a larger battery can be used to allow it to run up to years of time without
replacing the battery, or contact RF Digital to inquire about a custom time setting which will reduce the
transmission interval thus reducing the average power consumption.
The Mode 0 is effectively Mode 1, except, in addition to Mode 1 features, the module will internally cause input 1
to transmit on its own every 2 seconds.
Mode 1 – Input Logic Transmitter
Pin # Pin Label Direction Function
13 +V Input +V Power
10 GND Input Ground
16 Mode Select 0 Input Tie to +V
17 Mode Select 1 Input Tie to GND
3 Mode Select 2 Input Tie to GND
4 TX LED Output Toggles high during transmission (1 blink every 15 milliseconds)
5 IN1 Input Active high switch input #1 (optional) if not used, pull to GND.