Rainbow Electronics RF22 - Manual (Page 84)

RF22
Version: 0.1 Date: 12/23/2008
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Bit Name Function
7 enovr Enable Overrides.
If high, ovr values are output to the blocks and can enable or disable them, if low, some ovr
value can only enable the blocks.
6 enxtal Xtal Override Enable Value.
5 ents Temperature Sensor Enable.
4 enrc32 32K Oscillator Enable.
3 Reserved Reserved.
2:0 diglvl Digital LDO Level Setting.
Register 67h. Delta-Sigma ADC Tuning 1
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name adcrst enrefdac enadc adctuneovr adctune[3:0]
Type R/W R/W R/W R/W R/W
Reset value = 00011101
Bit Name Function
7 adcrst Delta-Sigma ADC Reset.
6 enrefdac Delta-Sigma ADC Reference DAC Enable Override.
5 enadc Delta-Sigma ADC Enable Override.
4 adctuneovr Resonator RC Calibration Value Override Enable.
3:0 adctune[3:0] Resonator RC Calibration Value.
Register 68h. Delta-Sigma ADC Tuning 2
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name Reserved envcm adcoloop adcref[2:0]
Type R R/W R/W R/W
Reset value = 00000011
Bit Name Function
7:5 Reserved Reserved.
4 envcm Delta-Sigma ADC VCM Enable Override.
3 adcoloop Delta-Sigma ADC Open Loop Enable.
2:0 adcref[2:0] Delta-Sigma ADC Reference Voltage.
000: 0.5 V
001: 0.6 V
010: 0.7 V
…
111: 1.2 V
Register 69h. AGC Override 1
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name Reserved agcen lnagain pga[3:0]
Type R R/W R/W R/W
Reset value = 00100000
Bit Name Function
7:6 Reserved Reserved.
5 agcen Automatic Gain Control Enable.
When this bit is set then the result of the control can be read out from bits [4:0], otherwise the
gain can be controlled manually by writing into bits [4:0].
4 lnagain LNA Gain Select.
0 – min. gain = 5 dB
1 – max. gain = 25 dB
3:0 pga[3:0] PGA Gain Override Value.
000: 0 dB