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Using the PDN Line
The Power Down (PDN) line can be used to power down the transceiver
without the need for an external switch. This line has an internal pull-down,
so when it is held low or simply left floating, the module will be inactive.
When the PDN line is pulled to ground, the transceiver will enter into a low-
current (~20μA) power-down mode. During this time the transceiver 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, such as a microcontroller. By periodically activating the
transceiver, sending data, then powering down, the transceiver’s average
current consumption can be greatly reduced, saving power in battery-
operated applications.
Note: If the T/R_SEL line is toggled when the transceiver is powered
down, internal logic will wake up and increase the current consumption
to approximately 350μA. When high, the T/R_SEL line will sink
approximately 15μA, so the lowest current consumption is obtained by
placing the LT into receive mode before powering down.
Using the RSSI Line
The transceiver’s Received Signal Strength Indicator (RSSI) line serves a
variety of functions. This line has a dynamic range of 80dB (typical) and
outputs a voltage proportional to the incoming signal strength. It should be
noted that the RSSI levels and dynamic range will vary slightly from part
to part. It is also important to remember that RSSI output indicates the
strength of any in-band RF energy and not necessarily just that from the
intended transmitter; therefore, it should be used only to qualify the level
and presence of a signal. Using RSSI to determine distance or data validity
is not recommended.
The RSSI output can be utilized during testing, or even as a product
feature, to assess interference and channel quality by looking at the RSSI
level with all intended transmitters shut off. RSSI 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
– 14 –
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