MRF49XA-ISLASHT datasheet(12/102 Pages) MICROCHIP

12 / 102 page

MRF49XA

DS70590C-page 12

Preliminary

RFXTL/EXTREF

Analog Input

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 μF capacitor.

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.

Vss

Ground

Ground reference.

RFP

RF Input/Output

Differential RF input/output (+).

RFN

RF Input/Output

Differential RF input/output (-).

VDD

Power

RF power supply. Bypass with a capacitor close to the pin.

See Section 2.1, Power and Ground Pins for more details.

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.

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.

TABLE 2-1:

PIN DESCRIPTION (CONTINUED)

Symbol

Type

Description

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