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USING THE PDN PIN
The Power Down (PDN) line can be used to power down the receiver without the
need for an external switch. This line has an internal pull-up, so when it is held
high or simply left floating, the module will be active.
When the PDN line is pulled to ground, the receiver will enter into a low-current
(<50μA) power-down mode. During this time the receiver is off and cannot
perform any function. It may be useful to note that the startup time coming out of
power-down will be slightly less than when applying V CC .
The PDN line allows easy control of the receiver state from external components,
like a microcontroller. By periodically activating the receiver, checking for data,
then powering down, the receiver’s average current consumption can be greatly
reduced, saving power in battery-operated applications.
USING THE RSSI PIN
The receiver’s Received Signal Strength Indicator (RSSI) line serves a variety of
uses. The RSSI line has a dynamic range of 60dB (typical) and outputs a voltage
proportional to the incoming signal strength. A graph of the RSSI line’s
characteristics appears in the Typical Performance Graphs section. It should be
realized that the RSSI levels and dynamic range will vary slightly from part to
part. It is also important to remember that the RSSI output indicates the strength
of any in-band RF energy and not necessarily just that from the intended
transmitter; therefore, it should only be used to qualify the level and presence of
a signal.
The RSSI output can be used to create external squelch circuits. It can be
utilized during testing or even as a product feature to assess interference and
channel quality by looking at the voltage level with all intended transmitters off.
The RSSI output can also be used in direction-finding applications although
there are many potential perils to consider in such systems. Finally, it can be
used to save system power by “waking up” external circuitry when a transmission
is received or crosses a certain threshold. The RSSI output feature adds
tremendous versatility for the creative designer.
POWER SUPPLY REQUIREMENTS
The module does not have an internal voltage
regulator, therefore it requires a clean, well-regulated
Vcc TO
MODULE
power source. While it is preferable to power the unit
from a battery, it can also be operated from a power
supply as long as noise is less than 20mV. Power
supply noise can significantly affect the receiver
Vcc IN
10 Ω
10 μ F
sensitivity, therefore; providing clean power to the
module should be a high priority during design.
A 10 Ω resistor in series with the supply followed by a
Figure 9: Supply Filter
10μF tantalum capacitor from V CC to ground will help in cases where the quality
of the supply is poor. Note that the values may need to be adjusted depending
on the noise present on the supply line.
Page 6
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