7.6.2 RF Channel Selection

The PLL is designed to support:

  • One channel in the European SRD band from 863 MHz to 870 MHz at 868.3 MHz according to IEEE 802.15.4 (channel k = 0)
  • 10 channels in the North American ISM band from 902 MHz to 928 MHz with a channel spacing of 2 MHz according to IEEE 802.15.4. The center frequency of these channels is defined as:

    FC [MHz] = 906 [MHz] + 2 [MHz] x(k – 1), for k = 1, 2, ..., 10

    where k is the channel number.

Additionally, the PLL supports all frequencies from 769 MHz to 935 MHz with 1MHz frequency spacing and four bands with 100 kHz spacing from 769.0 MHz to 794.5 MHz, 857.0 MHz to 882.5 MHz and 902.0 MHz to 928.5 MHz. The frequency is selected by the CC_BAND bits in the CC_CTRL_1 register (CC_CTRL_1.CC_BAND) and CC_NUMBER bits in the CC_CTRL_0 register (CC_CTRL_0.CC_CTRL_0).

The table below shows the settings of CC_BAND and CC_NUMBER.

Table 7-4. Frequency Bands and Numbers
CC_BAND CC_NUMBER Description
0 Not used European and North American channels according to IEEE 802.15.4; Frequency selected by the CHANNEL bits in the PHY_CC_CCA register (PHY_CC_CCA.CHANNEL)
1 0x00 – 0xFF

769.0 MHz – 794.5 MHz

Fc [MHz] = 769.0 [MHz] + 0.1 [MHz] x CC_NUMBER
2 0x00 – 0xFF

857.0 MHz – 882.5 MHz

Fc [MHz] = 857.0 [MHz] + 0.1 [MHz] x CC_NUMBER
3 0x00 – 0xFF

903.0 MHz – 928.5 MHz

Fc [MHz] = 903.0 [MHz] + 0.1 [MHz] x CC_NUMBER
4 0x00 – 0x5E

769 MHz – 863 MHz

Fc [MHz] = 769 [MHz] + 1 [MHz] x CC_NUMBER
5 0x00 – 0x66

833 MHz – 935 MHz

Fc [MHz] = 833 [MHz] + 1 [MHz] x CC_NUMBER
6 0x00 – 0xFF

902.0 MHz – 927.5 MHz

Fc [MHz] = 902.0 [MHz] + 0.1 [MHz] x CC_NUMBER
7 0x00 – 0xFF Reserved

Bits 4:0 of register PHY_CC_CCA (0x08 – AT86RF212B) control the selection of IEEE802.15.4 Channels.

Table 7-5. CHANNEL Assignment
Value Description
0x00 868.3 MHz
0x01 906 MHz
0x02 908 MHz
0x03 910 MHz
0x04 912 MHz
0x05 914 MHz
0x06 916 MHz
0x07 918 MHz
0x08 920 MHz
0x09 922 MHz
0x0A 924 MHz
Reserved All other values are reserved