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SI5316-EVB Fiches technique(PDF) 5 Page - Silicon Laboratories

No de pièce SI5316-EVB
Description  The Si531x/2x Any-Frequency Precision Clocks
Download  26 Pages
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI5316-EVB Fiches technique(HTML) 5 Page - Silicon Laboratories

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Si531x-EVB Si532x-EVB
Rev. 0.6
5
Table 2 shows how the various components should be configured for the three modes of operation.
For a differential external reference, connect the balanced input signals to J1 and J2. For single-ended operation,
connect the input signal to J2 and disconnect J1.
R35 is provided so that a different termination scheme can be used. If R35 is populated, then remove R9 and R36.
5.4. Two and Three Level Inputs
The two-level and three-level inputs can all be manually configured by installing jumper plugs at J9. The two level
inputs are either H or L. For the three-level inputs, the M level is achieved by not installing a jumper plug at a given
location. J9 can also be used as a connection to an external circuit that controls these pins. J17 is a ten pin ribbon
header that is provided so that an external processor can control the Si532x over either the SPI or I2C bus.
J14 is another ten pin ribbon header that brings out all of the status outputs from the Si532x. Note that some pins
are shared and serve as both inputs and outputs, depending on how the device is configured. For users that wish
to remotely access the input and output pins settings as well as serial ports with external hardware, all three of
these headers can be connected to ribbon cables.
5.5. CPLD and Power
This CPLD is required for the MCU to control the Si532x. The CPLD provides two main functions: it translates the
voltage level from 3.3 V (the MCU voltage) to the Si532x voltage (either 1.8, 2.5, or 3.3 V). The MCU
communicates to the CPLD with the SPI signals SS_CPLD_B (slave select), MISO (master in, slave out), MOSI
(master out, slave in), and SCLK. The MCU can talk to CPLD-resident registers that are connected to pins that
control the Si532x's pins, mainly for pin control mode. When the MCU wishes to access a Si532x register, the SPI
signals are passed through the CPLD, while being level translated, to the Si532x. The CPLD is an EE device that
retains its code and is loaded through the JTAG port (J27). The core of the CPLD runs at 1.8 V, which is provided
by voltage regulator U6. The CPLD also logically connects many of the LEDs to the appropriate Si532x pins.
Table 2. Reference Input Mode
Mode
Xtal1
Ext Ref2
Wide Band
Input 1
NC3
J1
NC
Input 2
NC
J2
NC
C30
NOPOP4
install
install
C5
NOPOP
install
NOPOP
R34
NOPOP
NOPOP
install
R15
install
NOPOP
NOPOP
RATE0
M—H
RATE1
M—H
RATE5
LNC
Notes:
1. Xtal is 114.285 MHz third overtone; 40 MHz fundamental for the
Si5327-EVB
2. For external reference frequencies and RATE pin settings, see the
Si53xx-RM Any-Frequency Precision Clock Family
Reference Manual.
3. NC—No connect.
4. NOPOP—Do not install this component.
5. RATE options for Si5327 only.


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