Rainbow Electronics AT86RF401 - Manual (Page 31)

31
AT86RF401
1424D–RKE–09/02
• Bits[5:3]: PCC, Power Control (coarse)
Attenuates the output power in 6 dB steps.
• Bits[2:0]: PCF, Power Control (fine)
Attenuates the output power in 1 dB steps.
VCO Tuning Register 6 – VCOTUNE
Note: * These values are unknown at initial startup.
• Bits[4:0]: VCO Tuning Capacitor Array
This device requires the use of an external inductor to tune the VCO. Tolerance of the
inductor, coupled with process variation of the device, can lead to variations in the tun-
ing point of the VCO. A switched array of tuning capacitors has been added internally to
the device in order to “fine tune” the VCO. This capacitance is switched across pins 3
PCC[5:3] Output Attenuation
000 0 dB
001 6 dB
010 12 dB
011 18 dB
100 24 dB
101 30 dB
110 Invalid
111 Invalid
PCF[2:0] Output Attenuation
000 0 dB
001 1 dB
010 2 dB
011 3 dB
100 4 dB
101 5 dB
110 Invalid
111 Invalid
Bit 7 6 5 4 3 2 1 0
$16 VCOVDET[1] VCOVDET[0] – VCOTUNE[4] VCOTUNE[3] VCOTUNE[2] VCOTUNE[1] VCOTUNE[0]
Read/Write R R R/W R/W R/W R/W R/W R/W
Initial Value * * 0 0 0 0 0 0