AT86RF401E ATMEL [ATMEL Corporation], AT86RF401E Datasheet - Page 31

• Manufacturer Part Number: AT86RF401E
• Description: Smart RF Wireless Data Microtransmitter
• Manufacturer: ATMEL [ATMEL Corporation]

VCO Tuning Register 6 – VCOTUNE
1424F–RKE–12/03
Initial Value
Read/Write
$16
Bit
VCOVDET[1]
R
7
*
VCOVDET[0]
R
6
*
• Bits[5:3]: PCC, Power Control (coarse)
Attenuates the output power in 6 dB steps.
Table 10. Coarse Power Control Definition
• Bits[2:0]: PCF, Power Control (fine)
Attenuates the output power in 1 dB steps.
Table 11. Fine Power Control Definition
Note:
• 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
and 4 (L1 and L2) of the device. The capacitor array is set by VCOTUNE[4:0] and is
comprised of the following switched capacitance levels:
* These values are unknown at initial startup.
R/W
5
–
0
PCC[5:3]
PCF[2:0]
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
VCOTUNE[4]
R/W
4
0
VCOTUNE[3]
R/W
3
0
VCOTUNE[2]
R/W
2
0
Output Attenuation
Output Attenuation
VCOTUNE[1]
Invalid
Invalid
Invalid
Invalid
12 dB
18 dB
24 dB
30 dB
0 dB
6 dB
0 dB
1 dB
2 dB
3 dB
4 dB
5 dB
R/W
AT86RF401
1
0
VCOTUNE[0]
R/W
0
0
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