MICRF405 datasheet(38/46 Pages) MICREL

38 / 46 page

Micrel

MICRF405

April 2006

M9999-041906

(408) 955-1690

Pream_Len1

Pream_Len0

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

Sel_CRC0

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

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

Not used

868 MHz, 433MHz

915 MHz

950MHz, 315MHz

Table 39. VCO Frequency.

MOD_I

Comments

1..31

The deviation is linearly dependent of MOD_I

Table 40. Modulator Current Setting for Frequency Deviation.

MOD_A

Comments

0..4

Frequency deviation attenuator (or range selector). The attenuations are (values 0 through 4, respectively)

and

Table 41. Modulator Attenuator Setting for Frequency Deviation.

MICRF405 Datasheet(PDF) 38 Page - Micrel Semiconductor

MICRF405 Datasheet(HTML) 38 Page - Micrel Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Datasheet Download

Link URL