RFM31B-868-S1 QUASAR, RFM31B-868-S1 Datasheet - Page 10

• Manufacturer Part Number: RFM31B-868-S1
• Description: MODULE, RECEIVER, -118DB, SMD,868MHZ
• Manufacturer: QUASAR

Specifications of RFM31B-868-S1

• Modulation Type: FSK, GFSK, OOK
• Sensitivity: -121dBm
• Power Supply: 1.8V To 3.6V
• Supply Current: 18.5mA
• Data Rate Max: 256Kbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RFM31B
2. Functional Description
HopeRF's
The wide operating voltage range of 1.8–3.6V and low current consumption
solution for battery powered applications.
The RFM31B uses a single-conversion mixer to downconvert the 2-level FSK/GFSK/OOK modulated
receive signal to a low IF frequency. Following a programmable gain amplifier (PGA) the signal is converted to the
digital domain by a high performance  ADC allowing filtering, demodulation, slicing, and packet handling to be
performed in the built-in DSP increasing the receiver’s performance and flexibility versus analog based
architectures. The demodulated signal is then output to the system MCU through a programmable GPIO or via the
standard SPI bus by reading the 64-byte RX FIFO.
A high precision local oscillator (LO) is generated by an integrated VCO and  Fractional-N PLL synthesizer. The
synthesizer is designed to support configurable data rates, output frequency and frequency deviation .
of the available GPIO functions is shown in "RFM31B Register Descriptions.”
10
The RFM31B is designed to work with a microcontroller to create a very low
integrated on-chip which allows for a wide operating supply voltage range from
SPI bus is used to communicate with an external microcontroller. Three
are available. A complete list of the available GPIO functions is shown in "8. Auxiliary Functions" and includes
microcontroller clock output, Antenna Diversi ty, Antenna Switch, POR, and various interrupts. A complete list
Tel: [phone]
RFM31B are highly integrated, low cost, 433/868/915MHz wireless ISM receivers module .
100 p
C3
C1
C2
RFM31B module
L1
Fax: [phone]
100 n
C4
Figure 1.RFM31B Application Example
1 u
C5
,
VDD_RF
RXn
NC
RFp
NC
1
3
2
4
5
E-mail: [e-mail] http://www.hoperf.com
30 MHz
RF31B
X1
15
14
13
12
11
1 u
C6
SCLK
SDI
SDO
VDD_D
NC
cost system. Voltage regulators are
configurable general purpose I/Os
+1.8 to +3.6V. A standard 4-pin
GP1
GP2
GP3
GP4
GP5
makes the RFM31B an ideal
Microcontroller
VDD
VSS