RFM22 Datasheet, PDF (133/150 Pages) –

RFM22
Register 6Dh. TX Power
Bit
D7
Name
Type
D6
D5
D4
Reserved
R
D3
R/W
D2
txpow[2]
D1
D0
txpow[1:0]
R/W
Reset value = xxxx1000
Bit
Name
7:4
Reserved
3
txpow[2]
2:0
txpow[1:0]
Function
Reserved.
TX Output Power.
This bit is used in 4x31 output power programming.
TX Output Power.
The output power is configurable from +17 dBm to +8 dBm in ~3 dBm steps.
txpow[1:0] = 11 corresponds to +17 dBm and 00 to +8 dBm.
Register 6Eh. TX Data Rate 1
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
txdr[15:8]
Type
R/W
Reset value = 00001010
Bit
Name
Data Rate Upper Byte.
7:0
txdr[15:8]
See formula above.
Function
The data rate can be calculated as: TX_DR = 10³ x txdr[15:0] / 2¹⁶ [kbps] (if address 70[5] = 0) or
The data rate can be calculated as: TX_DR = 10³ x txdr[15:0] / 2²¹ [kbps] (if address 70[5] = 1)
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