Skyworks Si838xISO-EVB Manual de usuario
UG206: Si838xISO-EVB User's Guide
This user's guide explains the features of the Si838xISO-EVB, which is designed for the
evaluation of the Si838x part family and its recommended bill of materials.
The Si838x product family is a set of eight-channel isolators, rated to 2.5 kVrms, which
utilize LED emulator inputs to drive the isolation channel. Various configurations, includ-
ing the number of high speed (2 Mbps) channels and output types (SPI or Parallel), are
available per the ordering guide in the Si838x data sheet.
The Si838xISO-EVB is populated with an Si8384P and three different input networks,
each representing a recommendation derived from the respective IEC 61131-2 digital
input types at 24 V dc.
The Si838xISO-EVB allows designers to quickly evaluate the Si8384P's functionality
and capabilities by driving either 24V digital logic signals into the test-points labeled
"EXT" or 2V signals into the remaining test-points. For more Si838x information, visit
the Skyworks web site at www.skyworksinc.com. The product data sheet and application
notes should be referenced to facilitate designs.
KEY POINTS
• Discusses kit contents.
• Provides IEC 61131-2 Recommended Bill
of Materials.
• Demonstrates System-Level Transition
Values.
• Displays EVB Schematic and Layout.
• Demonstrates Timing Characteristics.
Si838xISO-EVB
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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1. Si838x as a PLC Digital Input Module
The Si838xISO-EVB is populated with a Si8384P unit, providing 8 parallel outputs, 4 channels which are high-speed and 4 channels
which are low-speed. Further, the EVB combines the Si838x LED emulator inputs with two-resistor input networks to form PLC digital
input modules per IEC 61131-2, as illustrated in the figure below. The Si838xISO-EVB has 2 channels configured for both Type-1 and
Type-2, and 4 channels configured for Type-3. For more information on how to select an input network based on system constraints,
view Application Note 970: Si838x Design Guide.
Si838xP
2.2nF
Low-side
Resistor
High-side
Resistor AHx
Input
BHx
Output
COM GND
VDD
R1
R2
VD
Field
Potential
IIN
ID
C1
24V DC
uController
Input
GND
VDD
VIN
Field PLC Digital Input Module PLC
High Speed
Channels Only
Sensor
Or Switch
Isolation Barrier
Current
Limit
Resistor
Status Lamp
LED
R3
D2
Figure 1.1. The Schematic for a Single Si838xP Channel Configured as a PLC Input Module in a 24 V DC System
UG206: Si838xISO-EVB User's Guide • Si838x as a PLC Digital Input Module
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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2. Kit Contents and Required Equipment
The Si838x Evaluation Kit contains the following items:
• Si838xISO-EVB evaluation board as shown on the front page.
• Si8384P-IU, 8 Channel (4 High Speed, 4 Low-Speed), 2.5 kVrms, 20-pin QSOP Body
2.1 Required Equipment
The following equipment is required to demonstrate the evaluation board:
• (Supply A) One DC Power supply 24V, 100mA
• (Supply B) One DC Power supply 2.5-5.5V, 100mA
• Two banana-to-test clip cables to supply signal and power to the input side of the board
• Two banana-to-wire cables to supply power to the output side of the board
• One 2-pin header shunt (included)
2.2 Optional Equipment
The following equipment is optional and can be used to demonstrate dynamic signally functionality of the evaluation board including
signal propagation statistics:
• One Signal generator (capable of sourcing 2mA)
• Two BNC Coaxial cables
• One BNC splitter
• One BNC to test-clip connector
• One 2-Channel Oscilloscope
• One 10x Voltage Probe
UG206: Si838xISO-EVB User's Guide • Kit Contents and Required Equipment
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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3. Background: Understanding Si838x and System Transitions
The Si838x LED emulators have built-in hysteresis around the input threshold, as illustrated in the figure below.
VF
Time
Device Off, Bx = 0
VHys
Time
IHys
Si838x Input I – V Relationship
Transition 1
(Tr1):
Low to High
Transition 2
(Tr2):
High to Low
VF(OFF) = VF(ON) - VHys
Device On, Bx = 1
Device
Off,
Bx = 0
VF(ON)
IF
IF(OFF) = IF(TH) - IHys
IF(TH)
Figure 3.1. Illustration of input hysteresis for the Si838x and the definitions IF(OFF) and VF(OFF)
When the Si838x inputs are combined with the two resistor input network, the system transitions as shown in the figure below.
VIN
IIN
TR1
Device On
System I-V Curve
TR2
Device On
VTR1
VTR2
Device Off
Device Off
Hysteresis Region
Hysteresis Region
ITR1
ITR2
Figure 3.2. Illustration of the system level transition points and the hysteresis region between them
A more detailed exploration of this topic can be found in Application Note 970, however this evaluation board serves to demonstrate the
values of TR1 and TR2 per the recommended bill of materials.
UG206: Si838xISO-EVB User's Guide • Background: Understanding Si838x and System Transitions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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4. Demonstration and Hardware Setup
This section demonstrates the static and dynamic properties of the Si838xISO-EVB reference design. The first demonstration allows
the user to evaluate system-level input voltage and current pairs in static situations. Meanwhile, the second demonstration, dynamic
switching, allows the user to evaluate the timing characteristics of the Si838x.
4.1 Static Signaling Demonstration
4.1.1 Powering the Board
Perform the following steps to set up and power the Si838xISO-EVB.
1. Remove all shunts.
2. Power Side-B
a. Supply 5.0V from Supply B to VDD and GND on the terminal block, matching GND.
i. Alternatively supply 5.0V power via clips at TP14 and GND at TP15.
b. LED, D1, will light up, confirming power is supplied.
Figure 4.1. EVB--Powered Up
UG206: Si838xISO-EVB User's Guide • Demonstration and Hardware Setup
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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4.1.2 Defaults/Failsafes
The default output signal of the Si8384P is a logic LOW, and this occurs when no power/signal is being supplied to the respective input
(for example, it is left floating).
1. Clear all signal test points on Side-A, thus floating the inputs.
2. Sequentially shunt each output, BH1-B4 via JP1-JP8, respectively
a. Note that the respective LEDs D2-D9 remain off.
Figure 4.2. EVB powered up without Side-A power or signal
3. Power Side-A
a. Side-A is powered on a per-channel basis from the input current and voltage across the LED emulator. This will be covered in
the following section.
UG206: Si838xISO-EVB User's Guide • Demonstration and Hardware Setup
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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4.1.3 Per Input Type Transition/Static Signaling
See Figure 4.1 EVB--Powered Up on page 5
1. Place a shunt across JP1, connecting output BH1 to D2.
2. Connect Supply A across AH1_EXT at TP1 and COM at TP28.
a. Increment the voltage from 0V to 24V and note the voltage and current when BH1 D2 first lights up
Note: The voltage and current combination at which the LED turned on is TR1,
b. Decrement the voltage from 24V to 0V and note the voltage and current when BH1 D2 first turns off.
Note: The voltage and current combination at which the LED turned off is TR2.
3. Repeat Step 2 for all AHX and AX channels.
a. The I-V values for TR1 and TR2 will vary from type to type.
Figure 4.3. EVB configured for static signal demonstration
UG206: Si838xISO-EVB User's Guide • Demonstration and Hardware Setup
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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4.2 Dynamic Signal Demonstration (Optional)
N.B. Make sure that your function generator can source approximately 2mA of current at 2.0V to drive the Si838x inputs
directly. The function generator will bypss the IEC recommended bill of materials in this demonstration. See the figure below.
1. Remove all shunts and clear all test points.
2. Set up signal generator and oscilloscope.
a. Generate a 2 Vpk-pk square wave at 100 kHz on the signal generator.
b. Split the signal generator output to two separate BNC cables via the splitter.
c. Attach one BNC cable end to oscilloscope Channel 1 and configure the channel for 1x gain.
d. Connect the remaining BNC cable end to the BNC-to-test-clip adapter.
e. Attach the 10x oscilloscope probe to oscilloscope Channel 2 and configure the channel for 10x gain.
3. Apply signal to board.
a. Clip the signal generator's output to AH1 (TP4) relative to COM (via either TP13 or TP28).
b. Connect the oscilloscope probe to the output BH1 (TP5).
c. Apply a jump across JP1 and observe D2 lighting up at 100 kHz.
4. Observe Channel 1 (input-AH1) and Channel 2 (output-BH1) on the oscilloscope for various parameters such as skew and jitter.
5. Repeat steps 3 and 4 for all channels.
Note: The AHx high-speed channels have a maximum signal frequency of 1 MHz, while the Ax low-speed channels have a
maximum input frequency of 100 kHz.
Figure 4.4. EVB Configured for Dynamic Signal Demonstration Without Enable
UG206: Si838xISO-EVB User's Guide • Demonstration and Hardware Setup
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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5. Schematic
Figure 5.1. Si838xISO-EVB Schematic
UG206: Si838xISO-EVB User's Guide • Schematic
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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6. Layout
Figure 6.1. EVB─Top Silk
Figure 6.2. EVB─Bottom Silk
UG206: Si838xISO-EVB User's Guide • Layout
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
10 Rev. 0.2 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 21, 2021 10
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