STW81103 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STW81103' PDF : 53 Pages View PDF
I2C bus interface
6.3
I2C registers
The STW81103 has 6 write-only registers and 1 read-only register.
6.3.1
Write-only registers
Table 17 gives a short description of the write-only registers.
Table 17. Write-only registers
HEX code
DEC code
0x00
0
0x01
1
0x02
2
0x03
3
0x04
4
0x05
5
FUNCTIONAL_MODE
Description
FUNCTIONAL_MODE
B_COUNTER
A_COUNTER
REF_DIVIDER
CONTROL
CALIBRATION
STW81103
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
OUTBUF_CTRL_EN CAL_AUTOSTART_EN PD4 PD3 PD2 PD1 PD0 B11
OUTBUF_CTRL_EN: Output buffer control mode enable (0 = Off; 1 = ON)
CAL_AUTOSTART_EN: VCO calibration auto-restart enable (0 = Off; 1 = ON)
The bits PD[4:0] allow to select different functional modes for the STW81103 synthesizer
according to the Table 18.
Table 18. Functional modes
Decimal value PD[6:0] Description
0
Power down mode
1
Enable VCO A, output frequency divided by 2
2
Enable VCO B, output frequency divided by 2
3
Enable external VCO, output frequency divided by 2
4
Enable VCO A, output frequency divided by 4
5
Enable VCO B, output frequency divided by 4
6
Enable external VCO, output frequency divided by 4
7
Enable VCO A, direct output
8
Enable VCO B, direct output
9
Enable external VCO, direct output
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