Micrel
MICRF405
April 2006
7
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
D7
D6
D5
D4
D3
D2
D1
D0
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
0
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).
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