SiT6702DM Rev. 1.01
Page 11 of 17
SiT6702DM Demo Board User Manual
The controls enclosed in the green-colored blocks located on the left side of the GUI represent the user-
accessible features of the SiTime device:
1.
Any-frequency programming:
a.
New frequency value in the range of 1 MHz to 340 MHz / 340 MHz to 725 MHz (for
SiT3521/2 respectively, upper frequency limit for HCSL driver is 500 MHz) can be
entered in edit box
Important note:
Frequencies in the range from 300.6 MHz to 307.499 MHz and
601.201 MHz to 614.999 MHz are not supported.
b.
Frequency value can be changed by swiping slider under the edit box
2.
DCO pull range and frequency pull change:
a.
Frequency pull range from 6.25 ppm*/25 ppm to 3200 ppm can be selected from the
drop down menu
b.
Frequency pull can be changed by swiping the slider or clicking on the buttons located
to the left and right sides of slider
c.
Step field defines the slider and button sensitivity. Step defines increment/decrement
value of the frequency control word written to the device (Refer to section 8.2 of the
SiT352x datasheet or the “DCTCXO-Specific Design Considerations” section of the
SiT51xx/SiT53xx datasheet for the details)
3.
OE control
a.
Pulls the OE pin to high/low state in case of hardware OE pin control
b.
Sends a command to enable/disable output to the device in case of software OE
*Pull Ranges from 6.25 ppm to 25 ppm are available for SiT51xx and SiT53xx devices only.
Note:
After
the new device frequency (SiT3521/2 only) or new pull range is selected, the software
automatically changes the DCO frequency pull to 0.
The diagram located on the right side of the GUI shows a simplified block diagram with current values
for the main blocks impacting output frequency. When evaluating SiT3521/2 oscillators, a text box near
the output driver represents the nominal value of the frequency calculated based on the frequency, pull
range, and frequency pull range values entered in the controls on the left side.
Note:
If no evaluation board
with a SiTime
device is connected to the SiT6702DM board or any mistake
is made when selecting device options (e.g. wrong device address specified), the GUI will display an
error message shown in
. In this case GUI re-initialization is required after connecting the
evaluation board.
