RFM42B Datasheet, PDF (28/51 Pages) List of Unclassifed Manufacturers – ISM TRANSMITTER

RFM42B/43B
5.2.1. Output Power Selection
With the RFM42B,the output power is configurable in 3 dB steps with the txpow[2:0] field in "Register 6Dh. TX
Power." Extra output power can allow the use of a cheaper, smaller antenna reducing the overall BOM cost. The
higher power setting of the chip achieves maximum possible range, but of course comes at the cost of higher TX
current consumption. However, depending on the duty cycle of the system, the effect on battery life may be
insignificant. Contact HOPERF Support for help in evaluating this tradeoff.
The +13 dBm output power of the RF43B is targeted at systems that require lower output power. The PA still
offers high efficiency and a range of output power from –8 to +13 dBm.
Add R/W Function/Description D7 D6 D5 D4 D3
D2
D1
D0 POR Def.
6D R/W
TX Power
txpow[2] txpow[1] txpow[0] 07h
txpow[2:0]
000
001
010
011
100
101
110
111
RFM42B Output Power
+1 dBm
+2 dBm
+5 dBm
+8 dBm
+11 dBm
+14 dBm
+17 dBm
+20 dBm
txpow[2:0]
000
001
010
011
100
101
110
111
RFM43B Output Power
–8 dBm
–5 dBm
–2 dBm
+1 dBm
+4 dBm
+7 dBm
+10 dBm
+13 dBm
Tel: [phone] Fax: [phone] E-mail: [e-mail] http://www.hoperf.com
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