Si5351A-A-GM Silicon Laboratories Inc, Si5351A-A-GM Datasheet - Page 16

• Manufacturer Part Number: Si5351A-A-GM
• Description: Clock Generators & Support Products AnyRate 2 PLL 125MHz Clk&I2C 8out
• Manufacturer: Silicon Laboratories Inc
• Type: Any Frequency CMOS Clock Generatorr

Specifications of Si5351A-A-GM

• Mounting Style: SMD/SMT
• Max Input Freq: 0.008 MHz
• Max Output Freq: 133 MHz
• Number Of Outputs: 8
• Operating Supply Voltage: 3.3 V
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 25 mA
• Package / Case: QFN-20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si5351A/B/C
5. Configuring the Si5351
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The Si5351 is a highly flexible clock generator which is entirely configurable through its I
C interface. The device’s
default configuration is stored in non-volatile memory (NVM) as shown in Figure 11. The NVM is a one time
programmable memory (OTP) which can store a custom user configuration at power-up. This is a useful feature for
applications that need a clock present at power-up (e.g., for providing a clock to a processor).
Power-Up
NVM
(OTP)
RAM
Default
Config
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I
C
Figure 11. Si5351 Memory Configuration
During a power cycle the contents of the NVM are copied into random access memory (RAM), which sets the
device configuration that will be used during normal operation. Any changes to the device configuration after
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power-up are made by reading and writing to registers in the RAM space through the I
C interface. A detailed
register map is shown in Section "8. Register Descriptions" on page 25.
5.1. Writing a Custom Configuration to RAM
To simplify device configuration, Silicon Labs has released the ClockBuilder Desktop. The software serves two
purposes: to configure the Si5351 with optimal configuration based on the desired frequencies and to control the
EVB when connected to a host PC.
The optimal configuration can be saved from the software in text files that can be used in any system, which
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configures the device over I
C. ClockBuilder Desktop can be downloaded from
www.silabs.com/ClockBuilder
and
runs on Windows XP, Windows Vista, and Windows 7.
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Once the configuration file has been saved, the device can be programmed via I
C by following the steps shown in
Figure 12.
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Preliminary Rev. 0.95