STW81103 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STW81103

Multi-band RF frequency synthesizer with integrated VCOs

STMicroelectronics 

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I2C bus interface

STW81103

CALIBRATION

6.3.2

MSB

LSB

b7

b6

b5

INITCAL SERCAL SELEXTCAL

b4

CAL4

b3

CAL3

b2

CAL2

b1

CAL1

b0

CAL0

This register controls the VCO calibrator using the following values:

INITCAL:

for test purposes only, must be set to 0

SERCAL: at 1 starts the VCO auto-calibration (automatically reset to 0 at the end of calibration)

SELEXTCAL: for test purposes only; must be set to 0

CAL[4:0]:

for test purposes only; must be set to 0

Read-only register

6.3.3

MSB

LSB

b7

b6

b5

b4

b3

b2

b1

b0

DEV_ID1 DEV_ID0 LOCK_DET INTCAL4 INTCAL3 INTCAL2 INTCAL1 INTCAL0

This register is automatically addressed in the ‘current byte address read mode’, using the

following values:

DEV_ID[1:0]: device identifier bits; returns ‘10’

LOCK_DET: 1 when PLL is locked

INTCAL[4:0]: internal value of the VCO control word

Default configuration

At power on, all the bits are set to '0'. Consequently the part starts in power down mode.

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