MICRF114 datasheet(3/34 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

Preliminary

DS50002416A-page 3

MICRF114

1.0

HARDWARE DESCRIPTION

1.1

Overview

The MICRF114 is a simple, low-cost OOK transmitter

with programmable output power. It is primarily

intended for command and control applications such as

RKE and GDO. The transmitter is synthesizer based

for high-frequency accuracy. It operates on a single

frequency that is determined by the frequency of the

crystal connected to the built-in reference oscillator.

This frequency can be selected from a wide range. The

more popular transmit frequencies require readily

available

crystal

frequencies.

For

example,

433.92 MHz transmit frequency requires a 13.56 MHz

crystal. The RF performance of the transmitter is

compliant with FCC and IC regulations and with some

Japanese standards. European Telecommunications

Standards Institute (ETSI) requirements can be met at

low-radiated power.

The MICRF114 is optimized for battery-powered

applications. It features low-current consumption and

can operate over a wide supply voltage range. Internal

circuits sensitive to supply voltage variations run from

the on-chip Low Dropout (LDO) regulator. To reduce

pin count and system Bill of Materials (BOM), the LDO

regulator does not need an external capacitor for

stability, and the single-pin reference oscillator has a

integrated programmable crystal load capacitor. The

single-ended RF output enables easy matching to

monopole antennas with a minimal number of external

components.

A 2-wire proprietary MCU interface is used to program

the parameters of the MICRF114 to select its operating

mode and to input the transmit data packet. A built-in

self-calibration circuit ensures consistent performance

over the operating frequency range and against

temperature

variations.

Initial

calibration

automatically performed

during Power-on Reset

(POR). Recalibration can be initiated by the MCU that

controls the application when required.

1.2

Block Diagram

Figure 1-1 shows the MICRF114 block diagram.

FIGURE 1-1:

MICRF114 ARCHITECTURE BLOCK DIAGRAM

VCO

1/32

SYNTHESIZER

OSC

SCK

SDI

LDO

VDD

POR

BIAS

REFERENCE

POWER MANAGEMENT

RFO

PFD

To Digital

Block

VSS

TX Data

Regulated

Supply

DIGITAL BLOCK

MCU Interface

Configuration register

Operating mode control

Self-Calibration

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