Document Number : 38-16007 Rev. *L Page 20 of 34
Table 24. Channel
Addr: 0x21 REG_CHANNEL Default: 0x00
76543210
Reserved Channel
Note
8. The RSSI will collect a single value each time the part is put into receive mode via Control register (Reg 0x03, bit 7=1). See Section for more details.
Bit Name Description
7 Reserved This bit is reserved and should be written with zero.
6:0 Channel The Channel register (Reg 0x21) is used to determine the Synthesizer frequency. A value of 2 corresponds to a
communication frequency of 2.402 GHz, while a value of 79 corresponds to a frequency of 2.479GHz. The channels
are separated from each other by 1 MHz intervals.
Limit application usage to channels 2-79 to adhere to FCC regulations. FCC regulations require that channels 0 and
1 and any channel greater than 79 be avoided. Use of other channels may be restricted by other regulatory agencies.
The application MCU must ensure that this register is modified before transmitting data over the air for the first time.
Table 25. Receive Signal Strength Indicator (RSSI)
[8]
Addr: 0x22 REG_RSSI Default: 0x00
76543210
Reserved Valid RSSI
Bit Name Description
7:6 Reserved These bits are reserved. This register is read-only.
5 Valid The Valid bit indicates whether the RSSI value in bits [4:0] are valid. This register is Read Only.
1 = RSSI value is valid
0 = RSSI value is invalid
4:0 RSSI The Receive Strength Signal Indicator (RSSI) value indicates the strength of the received signal. This is a read
only value with the higher values indicating stronger received signals meaning more reliable transmissions.
Table 26. PA Bias
Addr: 0x23 REG_PA Default: 0x00
76543210
Reserved PA Bias
Bit Name Description
7:3 Reserved These bits are reserved and should be written with zeroes.
2:0 PA Bias The Power Amplifier Bias (PA Bias) bits are used to set the transmit power of the IC through increasing (values up
to 7) or decreasing (values down to 0) the gain of the on-chip Power Amplifier. The higher the register value the
higher the transmit power. By changing the PA Bias value signal strength management functions can be accom-
plished. For general purpose communication a value of 7 is recommended.
Not Recommended for New Designs
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