MICRF405 Datasheet, PDF (38/46 Pages) Micrel Semiconductor – 290MHz-980MHz ISM Band ASK / FSK Transmitter

Micrel
MICRF405
Pream_Len1
0
0
1
1
Pream_Len0
0
1
0
1
Comments
Preamble length is 1 byte.
Preamble length is 2 bytes.
Preamble length is 3 bytes.
Preamble length is 4 bytes.
Table 36. Preamble Field Length.
Sel_CRC1
0
1
1
Sel_CRC0
X
0
1
Comments
CRC disabled
CCITT-8 CRC enabled. Byte is sent after payload data.
Polynomial function: X^8+X^5+X^4+1. (Byte part of Frame Length)
ITU-16 CRC enabled. Bytes are sent after payload data.
Polynomial function: X^16+X^12+X^5+1. (Byte part of Frame Length)
Table 37. CRC Select.
Manchester_en
0
1
Comments
Manchester encoding disabled.
Manchester encoding enabled. Data will be encoded before transmitted.
FSKn > 0 when using modulator.
Table 38. Manchester Encoding (only when BIT_IO_en=0).
VCO_freq2 VCO_freq1 VCO_freq0 Comments
0
0
0
Not used
0
0
1
0
1
0
868 MHz, 433MHz
0
1
1
1
0
0
915 MHz
1
0
1
1
1
0
950MHz, 315MHz
1
1
1
Table 39. VCO Frequency.
MOD_I
1..31
Comments
The deviation is linearly dependent of MOD_I
Table 40. Modulator Current Setting for Frequency Deviation.
MOD_A
0..4
Comments
Frequency deviation attenuator (or range selector). The attenuations are (values 0 through 4, respectively)
1 _, 1 _, 1 _, 1 _and 1
1 248
16
Table 41. Modulator Attenuator Setting for Frequency Deviation.
April 2006
38
M9999-041906
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