MICRF405 datasheet(7/46 Pages) MICREL

7 / 46 page

Micrel

MICRF405

April 2006

M9999-041906

(408) 955-1690

Data and Configuration Interface

The user interface of the MICRF405 is a serial

peripheral interface (SPI) consisting of Serial

interface enable (SEN), Serial data input/output

(SIO) and Serial clock (SCK). This user interface is

used for MICRF405 configuration setup and can

also be used for sending the user data. A second

option is to transmit data bitwise using the DATAIN

pin. The RDY/DATACLK pin is used to synchronize

the data transfers.

The control word consists of 30 addressable bytes

and defines the way of operations as well as

transmitting data. Table 1 shows all 30 bytes. The

values specified are the default setup, which are

preset after power up. The first register is the

desktop register controlling the state of the 405, the

PA and clock-out for the microcontroller. The next

block of 10bytes sets the output radio frequency

through the dividers A, N and M. The bytes with

address 11 to 21 set the frequency band, modulation

type, bit rate, loop filter type and bandwidth, XCO

tuning etc. This block is not frequently used as these

settings are usually static application dependent.

Address 22 and 23 are mostly test bits, and are

seldom altered from default settings in applications.

The interrupt register, which is located at address

24, is read only (writing to it will not do any harm or

have any effect). The last 5 bytes are used when

transferring user data to transmit through the SPI.

The first four set the SyncID field in the packet, and

the last is the one byte data buffer.

Adr

Data

A6..A0

0000000

Mode1=0

Mode0=1

PA2=1

PA1=1

PA0=1

ClkOut_en=1

Sync_en=1

Load_en=1

0000001

A0_5=0

A0_4=0

A0_3=1

A0_2=1

A0_1=1

A0_0=0

0000010

N0_11=0

N0_10=0

N0_9=0

N0_8=0

0000011

N0_7=0

N0_6=1

N0_5=1

N0_4=1

N0_3=0

N0_2=0

N0_1=1

N0_0=1

0000100

M0_11=0

M0_10=0

M0_9=0

M0_8=0

0000101

M0_7=0

M0_6=0

M0_5=1

M0_4=0

M0_3=0

M0_2=0

M0_1=0

M0_0=1

0000110

A1_5=0

A1_4=1

A1_3=1

A1_2=1

A1_1=1

A1_0=1

0000111

N1_11=0

N1_10=0

N1_9=0

N1_8=0

0001000

N1_7=0

N1_6=1

N1_5=1

N1_4=0

N1_3=1

N1_2=1

N1_1=1

N1_0=1

0001001

M1_11=0

M1_10=0

M1_9=0

M1_8=0

0001010

M1_7=0

M1_6=0

M1_5=1

M1_4=0

M1_3=0

M1_2=0

M1_1=0

M1_0=0

0001011

LowBatt_en=1

Freq_Band1=0

Freq_Band0=1

VCO_freq2=0

VCO_freq1=1

VCO_freq0=1

Modulation1=1

Modulation0=0

0001100 LowBatt_level=0

LDO_by=0

LDO_en1=1

LDO_en0=1

MOD_LDc_en=0

PA_FEc_en=0

PA_LDc_en=0

LD_en=1

0001101

Bit_IO_en=1

Manchester_en=0

Sel_CRC1=1

Sel_CRC0=1

SyncID_Len1=0

SyncID_Len0=1 Pream_Len1=1 Pream_Len0=0

0001110

Mod_I4=0

Mod_I3=1

Mod_I2=0

Mod_I1=0

Mod_I0=1

Mod_A2=0

Mod_A1=1

Mod_A0=1

0001111

VCO_Fr_Chk=0

VCO_Fr_Auto=0

FSKn2=1

FSKn1=0

FSKn0=0

Mod_F2=1

Mod_F1=0

Mod_F0=0

0010000

Prescaler_Sel=0

FSKClk_K5=1

FSKClk_K4=1

FSKClk_K3=0

FSKClk_K2=1

FSKClk_K1=0

FSKClk_K0=0

0010001

ASK_PN_en=0

ASK_EN=0

ASKshape2=1

ASKshape1=1

ASKshape0=1

ASK2=1

ASK1=1

ASK0=1

0010010

ASKn1=1

ASKn0=0

ASKClk_K5=1

ASKClk_K4=1

ASKClk_K3=0

ASKClk_K2=1

ASKClk_K1=0

ASKClk_K0=0

0010011

INT_LF_EN=1

CP_CUR1=0

CP_CUR0=1

LF_RES1_4=0

LF_RES1_3=1

LF_RES1_2=0

LF_RES1_1=0

LF_RES1_0=1

0010100

LF_High_PM=1

LF_CAP1=1

LF_CAP0=1

LF_RES3_4=0

LF_RES3_3=0

LF_RES3_2=1

LF_RES3_1=0

LF_RES3_0=1

0010101

ClkOut_1=0

ClkOut_0=0

XCO_Fast=1

XCOtune4=1

XCOtune3=0

XCOtune2=0

XCOtune1=0

XCOtune0=0

0010110 INT_LF_TEST=0

VCO_IB2=0

VCO_IB1=0

VCO_IB0=0

VCO_by=0

OUTS2=0

OUTS1=0

OUTS0=0

0010111

PA_IB3=1

PA_IB2 =0

PA_IB1=0

PA_IB0=1

PAB_IB3=1

PAB_IB2=0

PAB_IB1=0

PAB_IB0=1

0011000

VCO_freq_O2

VCO_freq_O1

VCO_freq_O0

VC_HI

VC_LO

LOW_BATT

0011001

SyncID3_7=1

SyncID3_6=1

SyncID3_5=1

SyncID3_4=0

SyncID3_3=0

SyncID3_2=1

SyncID3_1=0

SyncID3_0=1

0011010

SyncID2_7=1

SyncID2_6=1

SyncID2_5=1

SyncID2_4=0

SyncID2_3=0

SyncID2_2=1

SyncID2_1=0

SyncID2_0=1

0011011

SyncID1_7=1

SyncID1_6=1

SyncID1_5=1

SyncID1_4=0

SyncID1_3=0

SyncID1_2=1

SyncID1_1=0

SyncID1_0=1

0011100

SyncID0_7=1

SyncID0_6=1

SyncID0_5=1

SyncID0_4=0

SyncID0_3=0

SyncID0_2=1

SyncID0_1=0

SyncID0_0=1

0011101

DATA_7

DATA_6

DATA_5

DATA_4

DATA_3

DATA_2

DATA_1

DATA_0

Table 1. Controlword MICRF405 (values preset at power-up).

MICRF405 Datasheet(PDF) 7 Page - Micrel Semiconductor

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