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MRF49XA
TABLE 2-1:
PIN DESCRIPTION (CONTINUED)
Pin
9
Symbol
RFXTL/EXTREF
Type
Analog Input
Description
RF Crystal: This pin is connected to a 10 MHz series crystal
or to an external oscillator reference. The crystal is used as a
reference for the PLL which generates the local oscillator
frequency. It is possible to “pull” the crystal to the accurate
frequency by changing the load capacitor value.
External Reference Input: An external reference input, such
as an oscillator, can be connected as a reference source.
Connect the oscillator through a 0.01 μ F capacitor.
10
RESET
Digital Input/Output
Active-low hardware pin. This pin has an open-drain Reset
output with internal pull-up and input buffer. Refer to
Section 3.1, Reset for more details.
11
12
13
14
Vss
RFP
RFN
V DD
Ground
RF Input/Output
RF Input/Output
Power
Ground reference.
Differential RF input/output (+).
Differential RF input/output (-).
RF power supply. Bypass with a capacitor close to the pin.
See Section 2.1, Power and Ground Pins for more details.
15
RSSIO
Analog Input/Output Received Signal Strength Indicator Output: The analog
RSSI output is used to determine the signal strength. The
response and settling time depends on the external filter
capacitor. Typically, a 4-10 nF capacitor provides optimum
response time for most applications.
16
INT/DIO
Digital Input/Output
Interrupt: This pin can be configured as an active-low
external interrupt to the device. If a logic ‘ 0 ’ is applied to this
pin, it causes the IRO pin to toggle, signaling an interrupt to
the external microcontroller. The source of interrupt can be
determined by reading the first four bits of STSREG (see
Table 2-4 ). This pin can be used to wake-up the device from
Sleep.
Data Indicator Output: This pin can be configured to
indicate valid data based on the actual internal settings.
DS70590C-page 12
Preliminary
? 2009-2011 Microchip Technology Inc.
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