SI5332 Просмотр технического описания (PDF) - Silicon Laboratories

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SI5332

6/8/12-Output Any-Frequency Clock Generator

Silicon Laboratories 

Si5332 Data Sheet

Functional Description

3.7 Universal Hardware Input Pins

Universal hardware input pins are user configurable control input pins that can have one or more of the functions listed below assigned

to them using ClockBuilder Pro.

If more hardware input pins are needed, the differential input pins can be alternatively configured as two universal hardware input pins.

Contact Silicon Labs for further details. Universal hardware input pins can be utilized for the following functions:

Table 3.2. Universal Hardware Input Pins

Description

Spread_EN0

Spread_EN1

FS_INTx

FS_MSx

OE

I2C address select

CLKIN_SEL[1:0]

Function

Spread spectrum enable on MultiSynth0 (N0).

Spread spectrum enable on MultiSynth0 (N1).

Used to switch an integer output divider frequency from frequency A to frequency B.

Used to switch a MultiSynth output divider output from frequency and/or change spread

spectrum profile.

Output enable for one or more outputs.

Sets the LSB of the I2C address to either 0 or 1.

Selects between crystal or clock inputs.

MultiSynth Spread Enable Pins

Spread_EN[1:0] pins are active pins that enable/disable spread spectrum on all outputs that correspond to MutliSynth0 or MultiSynth1,

respectively. The change in frequency or spread spectrum will be instantaneous and may not be glitch free.

Table 3.3. SPREAD_EN Pin Selection Table

Spread_ENx

0

1

Spread Spectrum disabled on MultiSynthx

Spread Spectrum enabled on MultiSynthx

Output Frequency Select Pins

There are five integer dividers, one corresponding to each of the five output banks. Using ClockBuilder Pro, a universal hardware input

pin can be assigned for each integer divider, providing capability to select between two different pre-programmed divide values. Divider

values of every integer from 8 to 255 are available in ClockBuilder Pro for each integer divider.

Table 3.4. FS_INT Pin Selection Table

FS_INTx

0

1

Output Frequency from INTx

Frequency A, as defined in ClockBuilder Pro

Frequency B, as defined in ClockBuilder Pro

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