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RFM68W Schematic ( PDF Datasheet ) - HOPERF

Teilenummer RFM68W
Beschreibung Low Cost ISM Transmitter Module
Hersteller HOPERF
Logo HOPERF Logo 




Gesamt 20 Seiten
RFM68W Datasheet, Funktion
RFM68W Low Cost ISM Transmitter Module
Features
GENERAL DESCRIPTION
APPLICATIONS
The RFM68W is an ultra-low-cost, ‹ Garage Door Openers
FSK or OOK transmitter module
suitable for operation in the 315, ‹ Low-Cost Consumer
433, 868 and 915 MHz licence
free ISM bands., the RFM68W
may be used without the
Electronic Applications
‹ Remote Keyless Entry (RKE)
requirement for configuration via ‹ Remote Control / Security
an MCU. However, in conjunction
with a microcontroller, the
Systems
communication link parameters
may be re-configured. Including,
output power, modulation format KEY PRODUCT FEATURES
and operating channel.
The RFM68W offers integrated ‹ +10 dBm or 0 dBm
radio performance with cost
efficiency and is suited for
Configurable output power
operation in North America FCC ‹ Bit rates up to 100 kbps
part 15.231, FCC part 15.247 ‹ OOK and FSK modulation.
DTS and FHSS modes,15.249,
and Europe EN 300 220.
‹ 1.8 to 3.7 V supply range.
‹ Low BOM Fully Integrated Tx
In order to better use RFM68W
modules, this specification also
involves a large number of the
parameters and functions of its
‹ Fractional-N PLL with 1.5 kHz
typical step
‹ Frequency agility for FHSS
core chip RF68's,including those
modulation
IC pins which are not leaded out.
All of these can help customers
‹
FCC Part 15.247 DTS Mode
gain a better understanding of
compliant
the performance of RFM68W
modules, and enhance the
‹ Module Size:15X14.5mm
application skills.
V1.2
RFM68W
RFM68W
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
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RFM68W Datasheet, Funktion
RFM68W
RFM68W
2.4. Electrical Specifications
The table below gives the electrical specifications of the transmitter under the following conditions: Supply voltage = 3.3 V,
temperature = 25 °C, fXOSC = 26 MHz, fRF = 915 MHz, 2-FSK modulation with Fdev=+/-10 kHz, bit rate = 10 kbit/s and
output power = +10 dBm terminated in a matched 50 Ohm impedance, unless otherwise specified.
Table 4 Transmitter Specifications
Symbol Description
Current Consumption
IDDSL
Supply current in Sleep mode
IDDT_315 Supply current in Transmit mode
at 315 MHz*
IDDT_915 Supply current in Transmit mode
at 915 MHz*
RF and Baseband Specifications
FBAND Operation Frequency Bands
FDA
BRF
BRO
OOK_B
RFOP
RFOPFL
DRFOPV
PHN
Frequency deviation, FSK
Bit rate, FSK
Bit rate, OOK
OOK Modulation Depth
RF output power in 50 Ohms
in either frequency band
RF output power flatness
Variation in RF output power with
supply voltage
Transmitter phase noise
STEP_22
STEP_26
RF frequency step
RF frequency step
STEP_26 RF frequency step
Conditions
Min
RFOP=+10dBm 50% OOK
RFOP=+10dBm FSK
RFOP=0dBm FSK
RFOP=+10dBm FSK
RFOP=0dBm FSK
-
-
-
-
-
-
Band0,For 315MHz Module
312
Band0,For 433MHz Module
380
Band0,For 868MHz Module
Band1,For 915MHz Module
860
902
10
Permissible Range
0.5
Permissible Range
0.5
-
High Power Setting
Low Power Setting*
7
-3
From 315 to 380 MHz, 50 Ohms load -
2.5 V to 3.3 V
1.8 V to 3.7 V
-
-
At offset:
100 kHz
350 kHz
550 kHz
1.15 MHz
-
-
-
-
FXOSC = 24 MHz,for 315MHz module
FXOSC = 26MHz, for 433,868MHz
module
-
-
FXOSC = 26MHz, for 915MHz module
Typ
0.5
11
15
9
17.5
10.5
-
-
-
45
10
0
2
-
-
-82
-92
-96
-103
1.46484
1.58691
3.17383
Max Unit
1 µA
- mA
- mA
- mA
- mA
- mA
380 MHz
450 MHz
870 MHz
928 MHz
200 kHz
100 kbps
10 kbps
- dB
- dBm
- dBm
- dB
3 dB
7 dB
-76
-81
-91
-101
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
- kHz
- kHz
- kHz
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http:/ / www.hoperf.com
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RFM68W pdf, datenblatt
RFM68W
RFM68W
5. RFM68W Configuration
The RFM68W has several configuration parameters which can be selected through the serial
interface
5.1. TWI Access
As long as CTRL is kept stable, the DATA pin is considered by the circuit as the input for the data to be transmitted over the
air (Power&Go modes).
Programming of the configuration register is triggered by a rising edge on the CTRL line. Upon detection of this rising edge,
the data applied to the DATA pin is accepted as register configuration information, the data bits are clocked on subsequent
rising edges of the clocking signal applied to the CTRL pin. The timing for RFM68W configuration register ‘write’ is shown in
Figure 7. Note that, once triggered, all 24 clock cycle must be issued to the RFM68W.
CTRL
DATA
1st 2nd
DATA pin is an input
Figure 7. TWI Configuration Register ‘Write’.
The registers may, similarly, be read using the timing of Figure 8.
CTRL
23rd 24th
DATA
1st 2nd
8th
24th
DATA pin is an output
DATA pin is an input
Figure 8. TWI Configuration Register ‘Read’.
The first rising edge on CTRL which initiates the ADVANCED mode must occur at least 1 ms after the circuit has been
powered up or reset.
12
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http:/ / www.hoperf.com
Free Datasheet http://www.datasheet4u.com/

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