STW81101ATR datasheet(31/48 Pages) STMICROELECTRONICS

31 / 48 page

STW81101

I2C bus interface

31/48

and P is the selected prescaler modulus.

CALIBRATION

This register controls the VCO calibrator using the following values:

6.3.2

Read-only register

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

following values:

6.3.3

Default configuration

At power on reset, the following configuration is automatically loaded:

–

FUNCTIONAL MODE = 1 (VCOA with divided by 2 output)

–

A COUNTER = 8

–

B COUNTER = 562

–

R DIVIDER = 192

–

PLL_A[1:0] = [10]

–

CP_SEL[2:0] = [111]

–

PSC_MOD_SEL set to "0" (modulus = 16)

This corresponds to an output frequency of 1800MHz and a PFD frequency of 400kHz using

a 76.8MHz reference clock (calibration algorithm of the VCO is automatically started).

MSB

LSB

INITCAL

SERCAL

SELEXTCAL

CAL4

CAL3

CAL2

CAL1

CAL0

INITCAL:

resets the auto-calibrator state machine (writing to 1 and back to 0)

SERCAL:

at 1, starts the VCO auto-calibration (should be 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

MSB

LSB

DEV_ID1

DEV_ID0

LOCK_DET INTCAL4 INTCAL3 INTCAL2 INTCAL1 INTCAL0

DEV_ID[1:0]:

device identifier bits; returns 00

LOCK_DET:

1 when PLL is locked

INTCAL[4:0]:

internal value of the VCO control word

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