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Si4313-B1
The typical value of the total on-chip capacitance Cint can be calculated as follows:
Cint = 1.8 pF + 0.085 pF x xlc[6:0] + 3.7 pF x xtalshift
Note that the coarse shift bit xtalshift is not binary with xlc[6:0]. The total load capacitance Cload seen by the crystal
can be calculated by adding the sum of all external parasitic PCB capacitances Cext to Cint. If the maximum value
of Cint (16.3 pF) is not sufficient, an external capacitor can be added for exact tuning. Additional information on
calculating Cext and crystal selection guidelines is provided in “AN417: Si4x3x Family Crystal Oscillator.”
If AFC is disabled then the synthesizer frequency may be further adjusted by programming the Frequency Offset
field fo[9:0]in "Register 73h. Frequency Offset 1" and "Register 74h. Frequency Offset 2", as discussed in "3.5.
Frequency Control" on page 22.
The crystal oscillator frequency is divided down internally and may be output to the microcontroller through one of
the GPIO pins for use as the System Clock. In this fashion, only one crystal oscillator is required for the entire
system and the BOM cost is reduced. The available clock frequencies and GPIO configuration are discussed
further in "8.2. Microcontroller Clock" on page 33.
The Si4313 may also be driven with an external 30 MHz clock signal through the XOUT pin. When driving with an
external reference or using a TCXO, the XTAL load capacitance register should be set to 0.
Add R/W Function/Description
D7
D6
D5
D4
D3
D2
D1
D0
POR Def.
09
R/W
Crystal Oscillator Load
xtalshift
xlc[6]
xlc[5]
xlc[4]
xlc[3]
xlc[2]
xlc[1]
xlc[0]
7Fh
Capacitance
5.8. Regulators
There are a total of six regulators integrated onto the Si4313. With the exception of the digital regulator, all
regulators are designed to operate with only internal decoupling. The digital regulator requires an external 1 μF
decoupling capacitor. All regulators are designed to operate with an input supply voltage from +1.8 to +3.6 V.
A supply voltage should only be connected to the VDD pins. No voltage should be forced on the digital regulator
outputs.
28
Rev. 1.0
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