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RFM67W
R F M 6 7 W I S M T R A N S M I T T E R M O D U L E
V1.2
Features
GENERAL DESCRIPTION
The RFM67W is a transmitter
module which can operate in the
315, 433, 868 and 915 MHz
licence free ISM bands.
The transmitter module has two
modes of operation, a
conventional MCU controlled
mode and a ‘stand-alone’
mode which enables the
RFM67W to download
configuration and messages from
an E2PROM in response to a user
input.
Stand-alone mode makes the
RFM67W ideal for miniaturized or
low cost remote keyless entry
(RKE) applications. It also offers
the unique advantage of narrow-
band and wide-band
communication in a range of
modulation formats.
The RFM67W offers high RF
output power and channelized
operation suited for the European
(ETSI EN 300-220-1), North
American (FCC part 15.231,
15.247 and 15.249) and
Japanese (ARIB T-67) regulatory
standards.
APPLICATIONS
Remote Keyless Entry (RKE)
Remote Control / Security
Systems
Voice and Data RF
Communication Links
Process and building / home
control
Active RFID
AMR / AMI Platforms
KEY PRODUCT FEATURES
+17 dBm to -18 dBm
Programmable output power.
Bit rates up to 600 kbits / sec.
FSK, GFSK, MSK, GMSK and
OOK modulation.
Stand-alone mode: No need
for a host MCU.
Consistent RF performance
over a 1.8 to 3.7 V range.
Low phase noise (-95 dBc/Hz
at 50 kHz) with automated PLL
calibration and fully integrated
VCO and loop filter.
On chip RC timer for timer
/wake-up applications.
Low battery detection.
Module size:19.7X16mm
Low cost
NOTE:
In order to better use RFM67W
modules, this specification also
involves a large number of the
parameters and functions of its
core chip RF67's,including those
IC pins which are not leaded
out. All of these can help
customers gain a better
understanding of the
performance of RFM67W
modules, and enhance the
application skills.
RFM67W
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RFM67W
DATASHEET
Page
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
1.
General Description ................................................................................................................................................. 4
1.1.
1.2.
Simplified Block Diagram ................................................................................................................................. 4
Pin Diagram ..................................................................................................................................................... 5
1.3.
Pin Description..............................................................................................................................................6
2.
Electrical Characteristics ......................................................................................................................................... 7
2.1. ESD Notice ...................................................................................................................................................... 7
2.2. Absolute Maximum Ratings ............................................................................................................................. 7
2.3. Operating Range.............................................................................................................................................. 7
2.4.
Electrical Specifications.................................................................................................................................8
3.
Timing Characteristics ............................................................................................................................................. 9
Working Modes of the RFM67W ..............................................................................................................................10
4.1. Operating Modes ........................................................................................................................................... 10
4.2. Application Modes.......................................................................................................................................... 10
4.2.1. Stand Alone Mode .................................................................................................................................. 10
4.2.2. MCU Mode .............................................................................................................................................. 11
5.
Operation of the RFM67W .......................................................................................................................................12
5.1. Main Parameters............................................................................................................................................ 12
5.1.1. Center Frequency ................................................................................................................................... 12
5.1.2. Frequency Deviation ............................................................................................................................... 12
5.1.3. Bit Rate ................................................................................................................................................... 12
5.2. Synthesizer .................................................................................................................................................... 13
5.3. The Power Amplifier....................................................................................................................................... 14
6.
Digital Control and Interface .................................................................................................................................. 15
6.1. Stand Alone Mode ......................................................................................................................................... 15
6.1.1. State Machine Description ...................................................................................................................... 15
6.1.2. Memory Organization of the E2PROM ................................................................................................... 15
6.1.3. Periodic mode ......................................................................................................................................... 17
6.1.4. Low Battery Indicator: Stand Alone Mode............................................................................................... 18
6.1.5. Low Battery Indicator: MCU Mode .......................................................................................................... 18
6.2. MCU Mode ..................................................................................................................................................... 18
6.2.1. SPI Operation ......................................................................................................................................... 18
6.2.2. Data and Data Clock Usage..................................................................................................................20
6.3.
RFM67W Register Description....................................................................................................................21
7.
RFM67W Application Circuits ...................................................................................................................................26
4.
7.1.
Typical Application Schematic...........................................................................................................................26
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RFM67W
Table of contents
Section
Page
7.2.
Wake-up Times .............................................................................................................................................. 27
7.3. Reset Pin Timing............................................................................................................................................ 27
8.
Reference Design Performance ............................................................................................................................ 29
8.1. Power Output versus Consumption ............................................................................................................... 29
8.2.
8.3.
Power Output Flatness versus Temperature and Supply Voltage................................................................30
Phase Noise................................................................................................................................................... 31
8.4.
RFM67W Baseband Filtering.......................................................................................................................33
8.5. Adjacent Channel Power ............................................................................................................................... 33
9.
Packaging Information ........................................................................................................................................... 36
10. Ordering Information .............................................................................................................................................. 37
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RFM 67W
ADVANCED COMMUNICATIONS & SENSING
This product datasheet contains a detailed description of the RFM67W performance and functionality.
DATASHEET
1. General Description
The RFM67W is a transmitte module capable of (G)FSK, (G)MSK, and OOK modulation of an input data stream. It can
transmit this modulated signal in the 315, 433, 868 and 915 MHz licence free ISM bands.
1.1. Simplified Block Diagram
VBAT
VR_DIG
VR_ANA
RESET
TEST
VR_PA
Power Distribution
E2_MODE
RFOUT
PA1
Div 2/4/6
RC Oscillator
DATA
GND
Ramp and
Control
Interpolation
and Filtering
Modulator
DCLK
Fractional-N
PLL
PLL_LOCK
PA2
NSS
Calibration
MISO
Registers
and SPI
Interface
÷R
XTAL
Switch I/P
MOSI
SCK
CLKOUT
XTA
XTB
PB(3:0)
Figure 1. RFM67W Simplified Block Diagram
The general architecture of the RFM67W is shown in Figure 1. The frequency synthesizer generating the LO frequency is
a third-order fractional-N sigma-delta PLL. The PLL is capable of fast auto-calibration and offers fast switching and
settling times. For frequency modulation ((G)FSK and (G)MSK), the modulation is performed within the PLL bandwidth.
Optional pre-filtering of the bit stream may also be enabled to reduce the power delivered to adjacent channels.
Amplitude modulation (OOK), is performed via a DAC driving the reference of the regulator of the PA. Note that pre-filtering
of the bit stream is also available in this mode. The VCO works at 2, 4 or 6 times the RF output frequency to improve the
quadrature precision and reduce pulling effects during transmission.
The PA of the RFM67W is comprised of two amplifiers - one high power, one low power. This enables the RFM67W to
deliver a wide range, over 30 dB, of output powers - up to +13 dBm in single PA configuration. However, with an appropriate
output impedance transformation, in dual PA mode, this can be increased to +17 dBm.
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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RFM 67W
The RFM67W also includes two timing references; an RC oscillator, for sleep mode operation of the SPI interface (in
MCU mode), and a 32 MHz crystal oscillator, which serves as the low-noise frequency reference of the PLL. The
references and supply voltages are provided by the power distribution system which includes several regulators allowing
true battery powered operation.
1.2. Pin Diagram
(TOP)
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