STW81103 datasheet(32/53 Pages) STMICROELECTRONICS

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I2C bus interface

STW81103

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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.

FUNCTIONAL_MODE

The bits PD[4:0] allow to select different functional modes for the STW81103 synthesizer

according to the

Table 18.

Table 17.

Write-only registers

HEX code

DEC code

Description

0x00

FUNCTIONAL_MODE

0x01

B_COUNTER

0x02

A_COUNTER

0x03

REF_DIVIDER

0x04

CONTROL

0x05

CALIBRATION

MSB

LSB

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)

Table 18.

Functional modes

Decimal value PD[6:0] Description

Power down mode

Enable VCO A, output frequency divided by 2

Enable VCO B, output frequency divided by 2

Enable external VCO, output frequency divided by 2

Enable VCO A, output frequency divided by 4

Enable VCO B, output frequency divided by 4

Enable external VCO, output frequency divided by 4

Enable VCO A, direct output

Enable VCO B, direct output

Enable external VCO, direct output

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