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PDF RFM31B Data sheet ( Hoja de datos )
| Número de pieza | RFM31B | |
| Descripción | ISM RECEIVER | |
| Fabricantes | HOPERF | |
| Logotipo |  |
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RFM31B ISM RECEIVER
Features
Frequency Range
Programmable GPIOs
433/868/915MHz ISM bands
Embedded antenna diversity
Sensitivity = –121 dBm
algorithm
Low Power Consumption
Configurable packet handler
18.5 mA receive
Preamble detector
Data Rate = 0.123 to 256 kbps
RX 64 byte FIFO
FSK, GFSK, and OOK modulation Low battery detector
Power Supply = 1.8 to 3.6 V
Temperature sensor and 8-bit ADC
Ultra low power shutdown mode –40 to +85 °C temperature range
Digital RSSI
Integrated voltage regulators
Wake-up timer
Frequency hopping capability
Auto-frequency calibration (AFC) On-chip crystal tuning
Clear channel RX BW 2.6–620 kHz 14-PIN DIP & 16-PIN SMD package
Programmable assessment
Low BOM
Programmable packet handler
Power-on-reset (POR)
Applications
Remote control
Home security & alarm
Telemetry
Personal data logging
Toy control
Tire pressure monitoring
Wireless PC peripherals
Description
Remote meter reading
Remote keyless entry
Home automation
Industrial control
Sensor networks
Health monitors
Tag readers
HopeRF's RFM31B are highly integrated, low cost,433/868/915MHZ wireless
ISM receiver module. The low receive sensitivity (–121dBm) ensures
extended range and improved link performance. Built-in antenna diversity
and support for frequency hopping can be used to further extend range and
enhance performance.
Additional system features such as an automatic wake-up timer, low battery
detector, 64 byte RX FIFO, automatic packet handling, and preamble detection
reduce overall current consumption and allow the use of a lower-cost system
MCU. An integrated temperature sensor, general purpose ADC, power-on-reset
(POR), and GPIOs further reduce overall system cost and size.
The RFM31B's digital receive architecture features a high-performance ADC
and DSP based modem which performs demodulation, filtering, and packet
handling for increased flexibility and performance.
An easy-to-use calculator is provided to quickly configure the radio settings,
simplifying customer's system design and reducing time to market.
RFM31B
V1.0
RFM31B
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RFM31B
Table 2. Synthesizer AC Electrical Characteristics
Parameter
Synthesizer Frequency
Range
Symbol
FSYN
Conditions
433MHz band
868MHz band
915MHz band
Min Typ Max Units
413 453 MHz
848 888 MHz
901 929 MHz
Synthesizer Frequency
Resolution
Reference Frequency
Input Level
Synthesizer Settling Time
Residual FM
Phase Noise
FRES-LB
FRES-HB
fREF_LV
tLOCK
FRMS
L(fM)
433MHz Band
868/915MHz Band
When using external reference signal
driving XOUT pin, instead of using
crystal. Measured peak-to-peak (VPP)
Measured from exiting Ready mode with
XOSC running to any frequency.
Including VCO calibration.
Integrated over 250 kHz bandwidth
(500 Hz lower bound of integration)
F = 10 kHz
F = 100 kHz
F = 1 MHz
F = 10 MHz
— 156.25
— 312.5
0.7 —
— 200
—2
— –80
— –90
— –115
— –130
— Hz
— Hz
1.6 V
— µs
4 kHzRMS
— dBc/Hz
— dBc/Hz
— dBc/Hz
— dBc/Hz
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
RFM31B
2.1. Operating Modes
The RFM31B provides several operating modes which can be used to optimize the power consumption for a given
application. Depending upon the system communication protocol, an optimal trade-off between the radio wake time
and power consumption can be achieved.
Table8 summarizes the operating modes of the RFM31B. In general, any given operating mode may be classified as
an active mode or a power saving mode. The table indicates which block(s) are enabled (active) in each
corresponding mode. With the exception of the SHUTDOWN mode, all can be dynamically selected by sending the
appropriate commands over the SPI operating mode. An “X” in any cell means that, in the given mode of operation,
that block can be independently programmed to be either ON or OFF, without noticeably impacting the current
consumption. The SPI circuit block includes the SPI interface hardware and the device register space. The 32 kHz
OSC block includes the 32.768 kHz RC oscillator or 32.768 kHz crystal oscillator and wake-up timer. AUX
(Auxiliary Blocks) includes the temperature sensor, general purpose ADC, and low-battery detector.
Table 8. Operating Modes
Mode Name
Circuit Blocks
Digital LDO
SPI 32 kHz OSC AUX 30 MHz
XTAL
PLL RX
IVDD
SHUTDOWN
STANDBY
SLEEP
SENSOR
READY
TUNING
RECEIVE
OFF
(Register contents
lost)
ON
(Register contents
retained)
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF OFF 15 nA
OFF
ON
X
X
X
X
OFF
X
ON
X
X
X
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
OFF 450 nA
OFF 1 µA
OFF 1 µA
OFF 800 µA
OFF 8.5 mA
ON 18.5 mA
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com 11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RFM31B.PDF ] | |
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