SI5XX-PROG-EVB Datasheet, PDF(8/20 Page) Silicon Laboratories – Windows-compatible software control and device programming

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SI5XX-PROG-EVB Datasheet, PDF (8/20 Pages) Silicon Laboratories – Windows-compatible software control and device programming

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3.7. External I2C Communication

It is possible to use an external I2C controller to communicate with the DUT. To do this, remove the jumpers

installed in J20 and connect the external I2C harness to J20. Grounded pins (1-2, 7-8) are there for grounding the

harness. Pins 4 and 6 can be driven as SCL and SDA, respectively.

3.8. Si5xx-PROG-EVB Digital Control Signal

One normally static digital input control signal routes to the Si5xx: Output Enable or OE. By default, the OE signal

is pulled HIGH on the Si5xx-PROG-EVB and may be pulled low by installing a jumper at J16.

3.9. Si5xx-PROG-EVB Voltage Control Signal

An external voltage control signal may be applied to the control voltage modulation input at the J12 header

(VCO_IN). This voltage supplies the control voltage or voltage modulation input to the DUT. J13 should be installed

in the 2-3 position.

3.10. Output Terminations

The Si5xx-PROG-EVB can support four different output formats: CMOS, LVPECL, LVDS, and HCSL. There are

output resistors that are needed to accompany each format. Table 5 shows which resistors are needed for each

output:

Table 5. Output Termination Installation Definition

Output R36

R40

R35

R44

R37

R38

R29

R34

R43

R45

Format

CMOS 10

LVPECL 0

LVDS

130

HCSL

Rev. 0.3

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