Si57x-EVB
8
Rev. 0.2
1.6. Si57x/598/599 I
2
C Communication Configuration
The Si57x/598/599 supports I
2
C serial communication through the SDA and SCL pins. All Si570 and Si598 XOs
are pin and register compatible, and all Si571 and Si599 VCXOs are pin and register compatible. The device can
be operated as an I
2
C slave only. The MCU supports I
2
C communication to the DUT. The Si57x-EVB must be
configured by jumpers as described below to select the intended I
2
C communications path depending on the
DUT's nominal supply voltage.
For I
2
C communication with the Si57x/598/599 DUT = 2.5 or 3.3 V nominal, there must be jumpers installed at J1,
J2, and J11 pin 2. This defeats and bypasses the installed bidirectional voltage level translator at U3.
(For I
2
C communication with the Si57x/598/599 DUT at 1.8 V nominal supply, please consult the factory.)
1.7. Si57x/598/599 Digital Control Signals
There is one normally static digital input control signal that routes to the Si57x/598/599: Output Enable or OE. By
default, the OE signal is pulled HIGH on the Si57x-EVB and may be pulled low by installing a jumper at J9.
To support OE active LOW control, make the following changes to the Si57x motherboard:
Install R9.
Remove R14.
You can then selectively disable the OE active LOW by installing a jumper at J3. See Figure 4 for the location of
these components.
1.8. Si57x/598/599 Voltage Control Signal
An external voltage control signal may be applied to the control voltage modulation input at SMA connector J17,
silkscreen designation VC_MOD). This voltage supplies the control voltage or voltage modulation input to an Si571
when installed on the DB. No jumper changes are required to support the Si570/598 versus the Si571/599. Pin 1
on the Si571 is the V
C
pin and is a N/C for the Si570.
Summary of Contents for Si57-EVB Series
Page 5: ...Si57x EVB Rev 0 2 5 Figure 2 Si57x EVB Motherboard LED Locations...
Page 21: ...Si57x EVB Rev 0 2 21 Figure 13 Si57x EVB MB Primary Side...
Page 22: ...Si57x EVB 22 Rev 0 2 Figure 14 Si57x EVB MB GND Plane 1...
Page 23: ...Si57x EVB Rev 0 2 23 Figure 15 Si57x EVB MB 57x_VDD Plane...
Page 24: ...Si57x EVB 24 Rev 0 2 Figure 16 Si57x EVB MB 5 3 3 V Plane...
Page 25: ...Si57x EVB Rev 0 2 25 Figure 17 Si57x EVB MB GND Plane 2...
Page 26: ...Si57x EVB 26 Rev 0 2 Figure 18 Si57x EVB MB Secondary Side...
Page 27: ...Si57x EVB Rev 0 2 27 Figure 19 Si57x EVB MB Silkscreen Side B...
Page 28: ...Si57x EVB 28 Rev 0 2 7 2 Si57x EVB Daughterboard Figure 20 Si57x EVB DB Silkscreen Side A...
Page 29: ...Si57x EVB Rev 0 2 29 Figure 21 Si57x EVB DB Primary Side...
Page 30: ...Si57x EVB 30 Rev 0 2 Figure 22 Si57x EVB DB GND Plane...
Page 31: ...Si57x EVB Rev 0 2 31 Figure 23 Si57x EVB DB 57x_VDD Plane...
Page 32: ...Si57x EVB 32 Rev 0 2 Figure 24 Si57x EVB DB Secondary Side...
Page 33: ...Si57x EVB Rev 0 2 33 Figure 25 Si57x EVB DB Silkscreen Side B...
