RFM31B-868-S1 QUASAR, RFM31B-868-S1 Datasheet - Page 13

• 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

The SPI interface contains a burst read/write mode which allows for reading/writing sequential registers without
having to re-send the SPI address. When the nSEL bit is held low while continuing to send SCLK pulses, the SPI
interface will automatically increment the ADDR and read from/write to the next address. An example burst write
transaction is illustrated in Figure 4 and a burst read in Figure 5. As long as nSEL is held low, input data will be
latched into the RFM31B every eight SCLK cycles.
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SDO
SCLK
nSEL
SCLK
nSEL
SDI
SDI
First Bit
First Bit
RW
RW
=1
=0
SDO
SCLK
nSEL
SDI
A6
A6
A5
A5
First Bit
A4
A4
RW
=0
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A3
A3
A6
A2
A2
Figure 4. SPI Timing—Burst Write Mode
Figure 5. SPI Timing—Burst Read Mode
A5
Figure 3. SPI Timing—READ Mode
A1
A1
A4
First Bit
A0
A0
A3
D7
=X
D7
=X
D7
A2
D6 D5 D4 D3
D6
=X
D6
=X
A1
D5
=X
D5
=X
First Bit
A0
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D4
=X
D4
=X
D7
D7
=X
D3
=X
D3
=X
D6 D5 D4 D3
D6
=X
D2
=X
D2 D1 D0
D2
=X
D5
=X
Last Bit
D1
=X
D1
=X
D4
=X
D0
=X
D0
=X
D3
=X
D7
=X
D7 D6 D5 D4 D3
D2
=X
D2 D1 D0
D6
=X
D1
=X
D5
=X
Last Bit
D0
=X
Last Bit
D4
=X
D3
=X
D2
=X
D2 D1 D0
RFM31B
D1
=X
Last Bit
D0
=X
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