27982 Parallax Inc, 27982 Datasheet - Page 3

• Manufacturer Part Number: 27982
• Description: RF Modules & Development Tools 433 MHZ RF TRANCEIVR
• Manufacturer: Parallax Inc
• Series: -r

Specifications of 27982

• Frequency: 433MHz
• Data Rate - Maximum: 9.6 kBaud
• Modulation Or Protocol: -
• Applications: General Purpose
• Power - Output: -
• Sensitivity: -
• Voltage - Supply: 3.3 V ~ 5 V
• Current - Receiving: -
• Current - Transmitting: -
• Data Interface: PCB, Through Hole
• Memory Size: -
• Antenna Connector: PCB, Through Hole
• Operating Temperature: 0°C ~ 70°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Precautions
Pin Definitions and Ratings
PDN
Pulling the PDN pin low puts the transceiver into low-power mode where it uses < 4 mA current. Leaving
it floating places the transceiver into normal mode where it will draw ~10 mA.
RSSI
The RSSI pin provides an analog voltage relative to what the transceiver is picking up (receiving). Note
that this signal is modulated and the voltage will vary with the rising and falling of the DATA line.
Synchronization
When initiating communication between two RF Transceiver modules, a sync pulse should be sent to re-
establish the radio connection between the modules. Sending several characters can accomplish this,
however sending a pulse (which maintains a high state during the synchronization) is more efficient:
Copyright © Parallax Inc.
√
√
Pin
1
2
3
4
5
6
For BS1s the following code line sends an appropriate sync pulse:
PULSOUT 0, 300
For BS2s the following code line sends an appropriate sync pulse:
The DATA and TX-RX pins are connected on the module to MOSFETs, which are highly sensitive
to static electricity. It is advised not to touch these pins unless necessary.
PULSOUT 0, 1200
GND
VIN
Serial Data
T/R
PDN
RSSI
Name
Ground: 0V (VSS)
Power: 3.3 to 5 VDC
Serial Data Input/Output; direction depends on T/R line
Transmit/Receive Select: LOW/Floating = Receive; HIGH = Transmit
Power Down: LOW = Power Down Mode; HIGH/Floating = Normal
Received Signal Strength Indicator
433 MHz RF Transceiver (#27982)
Function
v1.1 11/2/2009 Page 3 of 6