RFM42B-868-S1 QUASAR, RFM42B-868-S1 Datasheet - Page 12

• Manufacturer Part Number: RFM42B-868-S1
• Description: MODULE, TRANSMITTER, 20DB,SMD,868MHZ
• Manufacturer: QUASAR

Specifications of RFM42B-868-S1

• Modulation Type: FSK, GFSK, OOK
• Supply Voltage Range: 1.8V To 3.6V
• Supply Current: 85mA
• Interface Type: SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RFM42B/43B
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 3 and a burst read in Figure 4. As long as nSEL is held low, input data will be
latched into the RFM42B/43B every eight SCLK cycles.
12
SDO
SCLK
nSEL
SCLK
nSEL
SDI
SDI
Tel: [phone]
First Bit
First Bit
RW
RW
=1
=0
SDO
SCLK
nSEL
SDI
A6
A6
A5
A5
First Bit
A4
A4
RW
=0
A3
A3
A6
Fax: [phone]
A2
A2
Figure 3. SPI Timing—Burst Write Mode
Figure 4. SPI Timing—Burst Read Mode
A5
Figure 2. 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
D4
=X
D4
=X
D7
D7
=X
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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
D1
=X
Last Bit
D0
=X