RFM31B-868-D QUASAR, RFM31B-868-D Datasheet - Page 28

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

Specifications of RFM31B-868-D

• 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
6. Data Handling and Packet Handler
The internal modem is designed to operate with a packet including a 10101... preamble structure. To configure the
modem to operate with packet formats without a preamble or other legacy packet structures contact customer
support.
6.1. RX FIFO
A 64 byte FIFO is integrated into the chip for RX, as shown in Figure 11. "Register 7Fh. FIFO Access" is used to
access the FIFO. A burst read, as described in "3.1. Serial Peripheral Interface (SPI)" , from address
7Fh will read data from the RX FIFO.
The RX FIFO has one programmable threshold called the FIFO Almost Full Threshold, rxafthr[5:0]. When the
incoming RX data crosses the Almost Full Threshold an interrupt will be generated to the microcontroller via the
nIRQ pin. The microcontroller will then need to read the data from the RX FIFO.
The RX FIFO may be cleared or reset with the ffclrrx bit in “Register 08h. Operating Mode and Function Control 2,”.
All interrupts may be enabled by setting the Interrupt Enabled bits in "Register 05h. Interrupt Enable 1"
and “Register 06h. Interrupt Enable 2,”. If the interrupts are not enabled the function will not generate
an interrupt on the nIRQ pin but the bits will still be read correctly in the Interrupt Status registers.
28
Add R/W Function/D
Add R/W Function/De
08
7E
Tel: [phone]
R/W
R/W
escription
Operating &
scription
RX FIFO
Control 2
Function
Control
antdiv[2] antdiv[1] antdiv[0]
Reserved Reserved rxafthr[5] rxafthr[4] rxafthr[3] rxafthr[2] rxafthr[1] rxafthr[0]
D7
D7
Fax: [phone]
D6
D6
Figure 10. FIFO Threshold
RX FIFO
D5
D5
rxmpk
D4
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D4
RX FIFO Almost Full
Reserved
Threshold
D3
D3
enldm
D2
D2
ffclrrx
D1
D1
Reserved
D0
D0
POR Def.
POR
00h
Def.
37h