Rainbow Electronics RF22 - Manual (Page 85)

RF22
Version: 0.1 Date: 12/23/2008
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001: 3 dB
010: 6 dB
...
101: 24 dB max.
Register 6Ah. AGC Override 2
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name agcovpm agcslow lnacomp[3:0] pgath[1:0]
Type R/W R/W R/W R/W
Reset value = 00011101
Bit Name Function
7 agcovpm If set, AGC will ignore the Preamble Detection.
6 agcslow AGC Slow Gain Increase Enable.
When this bit is set then the AGC loop will slow down the gain increase in the receiver. The
speed of the gain reduction is not affected.
5:2 lnacomp[3:0] LNA Gain Compensation.
This bit is used for smoothing RSSI value when LNA gain is switched.
1:0 pgath[1:0] Window Comparator Reference Voltage Adjust in the PGA.
Register 6Bh. GFSK FIR Filter Coefficient Address
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name Reserved firadd[2:0]
Type R R/W
Reset value = xxxxx000
Bit Name Function
7:3 Reserved Reserved.
2:0 firadd[2:0] GFSK FIR Filter Coefficient Look-up Table Address.
The address for Gaussian filter coefficients used in the TX path. The default GFSK setting is for
BT = 0.5. It is not needed to change or load the GFSK Coefficients if BT = 0.5 is satisfactory for
the system.
000: i_coe0 (Default = d1)
001: i_coe1 (Default = d3)
010: i_coe2 (Default = d6)
011: i_coe3 (Default = d10)
100: i_coe4 (Default = d15)
101: i_coe5 (Default = d19)
110: i_coe6 (Default = d20)
Register 6Ch. GFSK FIR Filter Coefficient Value
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name Reserved firval[5:0]
Type R/W R/W
Reset value = xxxxx000
Bit Name Function
7:6 Reserved Reserved.
5:0 firval[5:0] FIR Coefficient Value in the lOok-up Table Addressed by the firadd[2:0].
The default coefficient can be read or modified.
Register 6Dh. TX Power
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name Reserved txpow[1:0]
Type R R/W