RFM22B-868-D QUASAR, RFM22B-868-D Datasheet - Page 15

• Manufacturer Part Number: RFM22B-868-D
• Description: MODULE, TRANSCEIVER, 20DB, 868MHZ
• Manufacturer: QUASAR

Specifications of RFM22B-868-D

• Modulation Type: FSK, GFSK, OOK
• Data Rate Max: 256Kbps
• Sensitivity: -121dBm
• Supply Voltage Range: 1.8V To 3.6V
• Supply Current: 85mA
• Interface Type: SPI
• 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 5 and a burst read in Figure 6. As long as nSEL is held low, input data will be
latched into the RFM22B/23B every eight SCLK cycles.
SDO
SCLK
nSEL
SCLK
nSEL
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SDI
SDI
First Bit
First Bit
RW
RW
=1
=0
SDO
SCLK
nSEL
SDI
A6 A5 A4 A3 A2 A1 A0
A6 A5 A4 A3 A2 A1 A0
First Bit
RW
=0
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A6 A5 A4 A3 A2 A1 A0
Figure 5. SPI Timing—Burst Write Mode
Figure 6. SPI Timing—Burst Read Mode
Figure 4. SPI Timing—READ Mode
First Bit
D7
=X
D7 D6 D5 D4 D3
D7
=X
D6
=X
D6
=X
D5
=X
D5
=X
First Bit
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D4
=X
D4
=X
D7 D6
D7
=X
D3
=X
D3
=X
D6
=X
D2 D1 D0 D7 D6 D5
D2
=X
D2
=X
D5
=X
D5
Last Bit
D1
=X
D1
=X
D4
=X
D4
D0
=X
D0
=X
D3
=X
D7
=X
D3
D2
=X
D6
=X
D1
=X
D2
D5
=X
Last Bit
D0
=X
Last Bit
RFM22B/23B
D4 D3
D4
=X
D1
D3
=X
D0
D2
=X
D2 D1 D0
D1
=X
Last Bit
D0
=X
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