SI5345_16 Datasheet, PDF (20/60 Pages) Silicon Laboratories – 10-Channel, Any-Frequency, Any-Output Jitter Attenuator/ Clock Multiplier

Si5345/44/42 Rev D Data Sheet
Functional Description
3.12 Serial Interface
Configuration and operation of the Si5345/44/42 is controlled by reading and writing registers using the I²C or SPI interface. The
I2C_SEL pin selects I²C or SPI operation. Communication with both 3.3 V and 1.8 V host is supported. The SPI mode operates in
either 4-wire or 3-wire. See the Family Reference Manual for details.
3.13 Custom Factory Preprogrammed Parts
For applications where a serial interface is not available for programming the device, custom pre-programmed parts can be ordered
with a specific configuration written into NVM. A factory preprogrammed part will generate clocks at power-up. Custom, factory-preprog-
rammed devices are available. The ClockBuilder Pro custom part number wizard can be used to quickly and easily generate a custom
part number for your configuration.
In less than three minutes, you will be able to generate a custom part number with a detailed data sheet addendum matching your
design’s configuration. Once you receive the confirmation email with the data sheet addendum, simply place an order with your local
Silicon Labs sales representative. Samples of your preprogrammed device will typically ship in about two weeks.
3.14 Enabling Features and/or Configuration Settings Unavailable in ClockBuilder Pro for Factory Preprogrammed Devices
As with essentially all modern software utilities, ClockBuilder Pro is continually being updated and enhanced. By registering at www.si-
labs.com, you will be notified about changes and their impact. This update process will ultimately enable ClockBuilder Pro users to ac-
cess all features and register setting values documented in this data sheet and the Family Reference Manual.
However, if you must enable or access a feature or register setting value so that the device starts up with this feature or a register
setting, but the feature or register setting is not yet available in CBPro, you must contact a Silicon Labs applications engineer for assis-
tance. One example of this type of feature or custom setting is the customizable output amplitude and common voltages for the clock
outputs. After careful review of your project file and requirements, the Silicon Labs applications engineer will email back your CBPro
project file with your specific features and register settings enabled using what's referred to as the manual "settings override" feature of
CBPro. "Override" settings to match your request(s) will be listed in your design report file. Examples of setting "overrides" in a CBPro
design report are shown in the following table.
Table 3.3. Setting Overrides
Location
0x04535[0]
0x0B48[0:4]
Name
FORCE_HOLD
OOF_DIV_CLK_DIS
Type
No NVM
User
Target
N/A
OPN&EVB
Dec Value
1
0
Hex Value
0x1
0x00
silabs.com | Smart. Connected. Energy-friendly.
Rev. 1.0 | 19