Si 8 0 x x - EV B
Si80
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D
IGITAL
I
SOLATO R
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VALUATION
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1. Introduction
The Si80xx evaluation kit allows designers to evaluate Silicon Lab's family of low-power digital isolators. These are
CMOS devices offering substantial data rate, propagation delay, power, size, reliability, and external BOM
advantages over legacy isolation technologies. The operating parameters of these products remain stable across
wide temperature ranges and throughout device service life for ease of design and highly uniform performance. All
device versions have Schmitt trigger inputs for high noise immunity and only require VDD bypass capacitors. Data
rates up to 10 Mbps are supported, and all devices achieve propagation delays of less than 65 ns. Enable inputs
provide a single point control for enabling and disabling output drive. Ordering options include a choice of 1kV
RMS
isolation ratings. For more information, refer to the Si80xx family data sheets. This evaluation kit consists of an
evaluation board featuring the QSOP-16 package. Note that the other packages are not available at this time.
1.1. Kit Contents
The Si80xx Evaluation Kit contains the following items:
Si80xx
based evaluation board as shown in Figures 1.
Si80xx Digital isolator (installed on the evaluation board)
Si8065
(QSOP-16)
Figure 1. Si80xx Evaluation Board Overview
Rev. 0.1 3/14
Copyright © 2014 by Silicon Laboratories
Si80xx-EVB
Si80xx-EVB
2. Required Equipment
The following items are required to demonstrate the evaluation board:
digital multimeter
2 multimeter test leads (red and black)
1 oscilloscope (Tektronix TDS 2024B or equivalent)
1 BNC splitter
4 coaxial cables
2 dc power supply (HP6024A, 30 V dc, 0–100 mA or equivalent)
2 BNC to clip converters (red and black)
4 Banana to clip wires (2 red and 2 black)
1 function generator (Agilent 33220A, 20 MHz or equivalent)
Si80xx Evaluation Board (board under test)
Si80xx Digital Isolator Input Evaluation Board User's Guide (this document)
1
2
Rev. 0.1
Si80xx-EVB
3. Hardware Overview and Demo
Figure 2 illustrates the connection diagram used to demonstrate the Si80xx-EVB. This demo transmits a 500 kHz
(5 V peak, 50 percent duty cycle) square wave through the isolator to its output. In this example, VDD1 and VDD2
are powered by 5 V supplies. Figure 3 shows a scope shot of CH1 (input) and CH2 (output). Note that if a user
wants to evaluate a digital isolator other than the ones pre-populated, this can be accomplished by removing the
installed device and replacing it with the desired footprint-compatible isolator device.
5 V
Supply
5 V
Supply
Signal Generator
Si8065
EVB
Oscilloscope
Ch1
Ch2
Signal Input
500 kHz, 5 Vpk
Square Wave
VDD1
A1
GND1
VDD2
B1
GND2
Figure 2. Summary Diagram and Demo Setup
Figure 3. Oscilloscope Display of Input and Output
Rev. 0.1
3
Si80xx-EVB
3.1. DC Supply Configuration
To run the demo, follow the instructions below. Review Figure 2 and Figure 5 if necessary.
1. Turn OFF the dc power supply and ensure that the output voltage is set to its lowest output voltage.
2. Connect the banana ends of the black and red banana-to-clip terminated wires to the outputs of both dc
supplies.
3. For the input side of the Si80xx-EVB, connect the clip end of the red banana-to-clip terminated wire to
VDD1 and the clip end of the black wire to GND1.
4. Similarly, for the output side of the EVB, the red wire goes to VDD2 and the black wire goes to GND2.
5. Turn ON the dc power supply and adjust both dc power supplies to provide 5 V on their outputs.
6. Ensure that the current draw is less than 25 mA. If it is larger, this indicates that either the board or Si80xx
has been damaged or the supply is connected backwards.
3.2. Wave Form Generator
1. Turn ON the arbitrary waveform generator with the output disengaged.
2. Adjust its output to provide a 500 kHz, 0 to 5 V peak square wave (50 percent duty cycle) to its output.
3. Connect one end of the first coaxial cable to the output of the signal generator.
4. Connect the BNC splitter to the other end of the first coaxial cable.
5. From the BNC splitter, connect the second coaxial cable to CH1 of the scope. CH1 will display the input to
the EVB.
6. Connect the third coaxial cable to the BNC splitter, and connect a BNC-to-clip converter to the end of this
coaxial cable.
7. From here, connect the clip end of the BNC-to-clip converter to the Si80xx-EVB’s A1 (red wire here) and
GND1 (black wire here).
8. Connect one end of the fourth coaxial cable to a BNC-to-clip converter (note that a scope probe can be
used here instead).
9. From here, connect the clip end of the BNC-to-clip converter to the Si80xx-EVB’s B1 (red wire here) and
GND2 (black wire here).
10. Connect the other end of the fourth coaxial cable to CH2 of the oscilloscope. CH2 will display the output
of the EVB.
11. Engage the output of the waveform generator.
3.3. Oscilloscope Setup
1. Turn ON the oscilloscope.
2. Set the scope to Trigger on CH1 and adjust the trigger level to 1 V minimum.
3. Set CH1and CH2 to 2 V per division.
4. Adjust the seconds/division setting to 400 ns/division.
5. Adjust the level indicator for all channels to properly view each channel as shown in Figure 3.
A 500 kHz square wave should display on Channel 1 of the scope for the input and a 5 V delayed version of this
square wave should display the output on Channel 2, as shown in Figure 3. This concludes the basic demo.
4
Rev. 0.1
Si80xx-EVB
4. Hardware and Overview Setup
The board is designed to be powered from two separate supplies VDD1, VDD2 that can be independently varied
from 3.15 to 5.5 V. Figure 4 shows a silkscreen overview of the board and Figure 5 shows the board schematic.
The power and jumper connection descriptions are summarized here:
J1/3/5
Stake headers used to power and connect to the digital isolator’s Side1 pins.
J2/4/6 Stake headers used to power and connect to the digital isolator’s Side 2 pins.
TP1/2/3/4 Test Points that can also be used to provide VDD and GND.
Figure 4. Si80xx DIP8 Evaluation Board Silkscreen
Rev. 0.1
5
NXP MCU
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