The document outlines Silicon Labs' industrial automation solutions, particularly focusing on their SI838x family of isolation products designed for applications like PLCs, isolation for high voltage, and enhanced safety features. It highlights the benefits of non-optical isolation methods improving reliability, efficiency, and performance, as well as specific products aimed at addressing challenges in industrial environments, such as high noise immunity and long lifetimes. Additionally, it details application areas, capabilities of various isolators, and available evaluation kits for practical implementation.

1. Integrating Speed and Design Flexibility with the
Si838x

2.  Industrial Automation - Applications & Challenges
 Introduction - Isolation Products
 Industrial Product Portfolio – Products That Solve Problems
 Si838x – PLC input modules isolators
 Si88xx – Isolators with integrated dc/dc
 Si82xx – Industrial MOSFET & IGBT drivers
 Si892x – Analog isolators
 Product Tools to Accelerate Design
Agenda

3. Industrial Automation Applications

4. Industrial Automation - Challenges
 No Compromise on Safety
 Safety features are critical
 Products should have stable performance under high stress
 High Noise Environment
 High noise immunity to external electrical/magnetic fields
 High immunity to high voltage noise transients
 Long Product Lifetimes
 Key parameters should be stable over temp, VDD and age
 Products should have long lifetime under high stress
 High Performance
 Product performance levels should be world class
 Low latency & skew ensure high efficiency and throughput
 Bottom Line
 High performance isolation products provide safety and high noise
immunity with long lifetimes

5. Introduction – Isolation Products

6. 6 Silicon Labs Confidential
Silicon Laboratories Confidential
Why Isolate?
Common isolation usage examples
 Safety
 Isolation protects electronics systems & people
 Here, 400V is isolated from a 3.3V MCU
 Level Shifting
 VDD1 and VDD2 can be different levels
 Noise elimination
 Ground currents do not disturb sensitive circuit
IN
GND1 GND2
OUT
VDD1 VDD2
CMOSIsolation
MCU
Low Voltage
3.3V
High
voltage
400 V
2x FET
driver
3.3V
Safety from high voltages
Power
MOSFETs
2.7V 5.5V
2.7V
GND1
5.5V
GND2
Level Shifting
IN
GND1 GND2
OUT
VDD1 VDD2
CMOSIsolation
Noise sensitive input
IN
GND1 GND2
OUT
VDD1 VDD2
CMOSIsolation
MCU
Eliminates noise by cutting ground loop
ADC
High
current I/O
High noise on GND2

7. 7 Silicon Labs Confidential
Traditional Isolation Used Optical Coupling
 Poor reliability
 Key parameters drift over temperature, VDD and age
 Poor timing characteristics
 Long delay times slow system throughput
 Key parameters (e.g. jitter) often not specified
 Marginal common mode transient immunity
(CMTI)
 Fast common mode transients can corrupt data
 Additional BOM required to meet CMTI requirements
 Energy inefficient
 Requires high current – increases overall energy consumption

8. 8 Silicon Labs Confidential
Isolation using non-optical (CMOS) capacitive coupling
 CMOS based design uses On-Off Key Modulation
 Uses differential capacitive coupling
 High voltage components are capacitors
 High reliability
 Inherent stability over temperature, VDD and age
 CMOS isolator reliability is 10x that of optos
 Excellent timing characteristics
 Low propagation delay
 Low skew – excellent part to part matching
 High common mode transient immunity (CMTI)
 High performance digital isolators achieve 200 kV/µs
 Low power
 Highly efficient digital isolators require a fraction of the power
compared to optos

9. Application Specific Challenges

10.  Programmable Logic Controllers (PLC)
 Industrial I/O modules
 CNC machines
 Servo motor control
 Process Automation Controllers (PAC)
 Process control using distributed control systems
PLC - Industrial Machine Control & Process Automation
Transceiver for
Communication
PLC
Output
Driver
P
Pressure sensor
Proximity
switch
Limit switch Si838x
FIRE
Pump motor
Flow valve
Fire alarm
Relay/
Solenoid
FET
PLC
Controller
Unit
Si88xx

11. 11 Silicon Labs Confidential
 PLC systems may have 128 channels
 Field inputs can be sourcing or sinking
 Optos are not fast enough for servo motor control
 Optos performance is poor over temp and age
Si838x solves this problem
 Huge board area savings
 Up to 8x channels in QSOP-20 package
 Up to 16x Si838x can be daisy chained for 128 channels
 One SPI interface to processor
 Bipolar input capability (sourcing or sinking)
 2 Mbps data rates possible for reliable servo control
 High noise immunity
Problem: PLC needs fast & multiple isolated inputs
PLC board
24 V Digital Inputs
Channel 1
Proximity sensor
Channel 2
Pressure sensor
Channel 8
Embedded
processor
24 V Digital Outputs
PLC board
Channel 1
Channel 2
Channel 8
Embedded
processor
CMOSIsolation
1x Si838x
SPI
8xinputs

12. 12 Silicon Labs Confidential
APPLICATIONS
FEATURES
 Programmable Logic Controllers
(PLC)
 CNC Machines
 Distributed I/O
 Process Automation Controllers
(PAC)
 Servo Motor Control
Si838x: PLC Input Isolator
 8x bipolar inputs, interface to 24V digital field inputs
 2 Mbps high speed channels for servo control
 Parallel interface option also available
 Integrated 2.5kVrms safety rated isolation
 De-bounce filter
 2.25 -5.5 V VDD capability for low power controller interface
 Low EMI due to dithering technique used in design
 IEC 61131-2 compliant, Type 1,2,3
IsolationBarrier
Si8380S
e
e
e
e
e
e
e
e
SPI
VDD
GND
MISO
MOSI
SCLK
NSS
SDITHRU
A1
A2
A3
A4
A5
A6
A7
A8
COM
CMOSIsolationBarrier

13.  24V field side switches are connected to Si838x input through simple R network (R1, R2)
 R1, R2 values ensure IEC 61131-2 compliance to Type 1,2,3 switches
 App note AN 970: PLC Inputs Design Guide explains how to calculate R1, R2
Si838x: Application Diagram
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
IsolationBarrier
Current
Limit
Resistor
Status Lamp
LED
R3
D2

14.  The Si8380S can be daisy chained for 128 total channels
 Max SCLK frequency will be reduced based on number of devices
Daisy Chain Capability: 128 Channels
Si8380S_0
MOSI
SCLK
NSS
MISO
SDITHRU
SPI Master
MOSI
SCLK
NSS
MISO
Si8380S_1
MOSI
SCLK
NSS
MISO
SDITHRU
Si8380S_2
MOSI
SCLK
NSS
MISO
SDITHRU
Si8380S_15
MOSI
SCLK
NSS
MISO
SDITHRU
. . .

15.  Real-time hierarchical control network from control room to factory floor
 Connects sensors and actuators in machines and across modules
 Each connecting node is a transceiver (physical layer or “PHY”), for example: RS-485
 Transceiver needs to be signal and power isolated
Factory Automation - Isolating Interfaces (PHY)
ADC
ADC
ADC
Embedded
processor
Power Supply
Si88xx
Temp sensor
Flow sensor
F
P
Pressure sensor
RS-485 Transceiver
CMOSIsolation
DCDC
regulator
Digital
isolation
Channels
Rx/Tx
DCDC
Control &
switch
Rx
Tx
VOUT
VCC
EN
Digital
isolation
Channels
Rx/Tx
A
B

16. 16 Silicon Labs Confidential
 Signal isolators solve key system issues
 Provide safety from high voltages
 Enable level shifting
 Reduce noise
 A total solution needs power isolation
Si88xx Solves the Problem
 Total solution for signal & power isolation
 Quad digital isolators, 100 Mbps data rate
 Up to 5W dc-dc converter, 83% peak efficiency
 Plug-n-play solution
Power Isolation is Difficult
Other
circuits
CMOSIsolation
Rx
Tx A
B
EN
Digital
isolation
Channels
Rx/Tx
Embedded
processor
Digital
isolation
Channels
Rx/Tx
VDDB
VOUTVIN
VIN
Power
Supply
Signal isolator
+
-
Power Switch
PWM Controller Opto-coupler Error Amp & Loop
Compensation
VOUT
Transformer
Isolation
MCU
B
A
Si88xx
Other
circuits
CMOSIsolation
DCDC
regulator
Digital
isolation
Channels
Rx/Tx
DCDC
Control &
switch
Rx
Tx
VOUT
VCC
EN
Digital
isolation
Channels
Rx/Tx
A
B
Embedded
processor
VIN
Power Supply
MCU

17. 17 Silicon Labs Confidential
APPLICATIONS
FEATURES
VOUT
A1
HF
RCVR
HF
RCVR
HF
RCVRA2
A3
A4
B1
B2
B3
B4
VDDB
VSNS
VDDA
VDD
VSW
HF
RCVR
HF
RCVR
UVLO
SH_FC
SS
FET
FET
UVLO
Error amp &
Compensation
GNDA GNDB
Si88240: 100Mbps quad digital
isolator with 2W DCDC converter
UTB02185s
COMP
DC/DC
controller
Frequency
control &
Shutdown ZCOMP
HF
XMTR
CMOSIsolation
HF
XMTR
HF
XMTR
HF
XMTR
HF
XMTR
 Factory automation
 Automotive battery
management systems (BMS)
 Process & motor control
 PLCs & distributed control
systems
Si88xx: Multi Channel Isolator with Integrated dc-dc
 Integrated dc-dc converter with secondary sensing & feedback
 Internal switch: 2 W of power & 78 % efficiency
 External switch: 5 W, 83% efficiency
 Full featured with soft start, frequency control, shutdown options
 Robust Isolation
 5 kVRMS reinforced
 Unmatched noise immunity of 100 kV/ms
 Up to four high speed digital channels, multiple configurations
 Low prop delay of 18 ns

18. Target Application: Power Supply Solutions
 Isolated ac/dc or dc/dc basic topology:
 Power stage and sync FET’s need gate drivers to control switching
 Critical needs
 Highest noise immunity to support fast switching for higher efficiency
 Safety is always important
Full wave
rectifier
Isolated
Gate Driver
Sync
FETs
Secondary
Side
Controller
Power
switch
DC Output
Voltage
Gate
Driver
AC Input
Voltage
Isolated
Transformer

19. 19 Silicon Labs Confidential
 Loss of VDDA/B can lead to flux imbalance
 Controller needs to know output power status
 Power systems need a safe initialization time
 Guarantee of no unintended switching
Si8239x solves this problem
 Internal UVLO feedback ensures output OFF &
status feedback to controller
 EN pin ensures safe default state
 Safe 1 ms startup time for initialization
 Special ESD circuit prevents power up through
EN pin
Problem: Switching power safely
400 V
GND
ON
OFF
VDDA
ON
VDDB
OFF
Controller
Isolation
Flux
imbalance
400 V
GND
OFF
VDDA
ON
VDDB
OFF
No flux
imbalance
UVLO&safety
control
CMOSIsolation
OFF
Si8239x: Enhanced safety driver
Controller
2.5V – 5.5V
VDDI
EN
RDY

20. 20 Silicon Labs Confidential
APPLICATIONS
FEATURES
IsoDriver
Driver
UVLO
UVLO
Driver
VDDI
VIA
VIB
RDY
DT
VDDA
VOA
VOB
VDDB
UVLO
Input
logic &
control
Deadtime
control
CMOSIsolation
Si8239x
 Power supply
 ac/dc converters
 dc/dc converters
Si8239x: Drivers with UVLO Safety
 UVLO safety feature – prevents flux imbalance
 UVLO status feedback to controller
 Optional shutdown feature on UVLO fault
 2.5 V VDDI capability
 1ms safe start-up delay: Allows safe system start-up
 EN (active high) instead of DIS for added safety
 High CMTI: 50kV/µs

21. 21 Silicon Labs Confidential
 Improves system efficiency and BOM
 Reduces size, cost of capacitor and magnetics
 Improves transient response
The risk is
 Increased switching transients: dv/dt
 Skipped pulses or permanent latch-up
 Si827x solves this problem
 High noise immunity (CMTI) of 200 kV/µs to avoid
skipped pulses
 High latch-up immunity of 400 kV/µs to prevent
permanent damage from latch-up
 Low 2.5 V VDDI
 EN pin for safe default
Problem: Faster switching desiredTypical power converter application with
half bridge topology
VDDA
VDDB
UVLO&safety
control
CMOSIsolation
Si827x: High Noise
Immunity Driver
Controller
2.5V – 5.5V
VDDI
EN
Protected to
400 kV/µs
Controller
Isolation
0 V – 600 V
in 5 ns
= 120 V/ns
120 kV/µs transient
can cause problems
Driver
600 V
GND
High side
MOSFET
Low side
MOSFET
600 V
GND
High side
MOSFET
Low side
MOSFET

22. 22 Silicon Labs Confidential
APPLICATIONS
FEATURESCMOSIsolation
Driver
Control
UVLOVDDI
VIA/PWM
VIB/DT
GNDA
VOA
UVLO VDDA
GNDA
VOB
UVLO VDDB
GNDB
Enable
 Power supplies
 Class-D audio amps
 dc/dc converters
Si827x: Drivers with high CMTI
 High CMTI (dV/dt immunity)
 200kV/us for data & 400kV/us for latch-up
 Low jitter and skew
 1ns max jitter, 5ns max output skew
 2.5V VDDI capability, 30V VDDA/B
 Optional separate outputs for pull-up/down on single channel
CMOSIsolation
Driver
Control
UVLOVDDI
VI
GNDI
VO+
VO+
UVLO VDDA
GNDA
Enable

23.  Drive stage for AC induction motor has multiple stages to provide power to motor through IGBTs
 Current/voltage feedback is provided for control loop
 Critical needs for drivers
 Integrated IGBT protection features, low latency, high noise immunity & wide temp range supported
 Critical needs for current sensing
 High noise immunity, low delay, accuracy over temperature
Motor Control
DC LINK(+)
DC LINK(-)
Si8920
3x
Si8920
Si828x
Si828x
Si828x
Si828x
Si828x
Si828x

24. 24 Silicon Labs Confidential
APPLICATIONS
FEATURES
CMOSIsolation
DESAT
Detection
Fault and
Reset
Miller
Clamp
Input
Control
UVLO UVLOVDDA
RDY
IN+
IN-
GNDA
RST
VDDB
CLMP
VH
VL
GNDB
VMID
DSAT
FLT
dc/dc
Controller
and
Switches
VDDP
VSW
GNDP
dc/dc
Regulator COMP
VSNS
 Motor drive inverters
 Solar inverters
 High power converters
Si8281: Isolated IGBT driver with dc-dc converter
 Integrated isolated dc/dc controller
 Orderable option to use higher voltage power rail (> 5.5 V)
 Options for frequency and soft-start control
 IGBT driver only option with no dc/dc also available

25.  Unique integrated DC/DC significantly simplifies layout
 A single power bus routed across system – no complicated spacing concerns
 Each driver creates its own power supply - supplies kept local to each driver
 Local power reduces inductance, improves noise, and removes transients
 Results in more compact and smaller PCB
Si828x Simplifies PCB Layout

26. 26 Silicon Labs Confidential
 Sensor has to be electrically isolated from controller
 Systems are noisy
 Sensors have large delays limiting response time
 Accuracy over temperature difficult to maintain
Si8920 iso amp is the solution…
 Robust galvanic isolation keeps controller safe
 Low signal delay; controller can respond quickly
 Tiny offset/gain drift insures accuracy
 Excellent transient noise immunity
Problem: Current Measurement in HV Systems
System
Controller
600V
Isolation
Si8920
System
Controller
600V
I?

27. 27 Silicon Labs Confidential
APPLICATIONS
Benefits
 Motor drive inverters
 Solar inverters
 High power converters
Si8920 : Isolated analog amplifier for current sense
 Low voltage, differential input connects directly to shunt resistor
 ±100mV (16x gain) or ± 200mV (8x gain), ±1% max gain error
 Low group delay allows fast response
 0.75 µs
 High bandwidth, low noise – allows wide usage with high accuracy
 0.03mVrms over 400kHz, 0.2% non-linearity
 High working voltage allows connection to high voltage bus
 1200V working voltage, 20+ years lifetime at working voltage
CMOSIsolation
Mod
UVLO UVLOVDDB
AIP
AIN
GNDB
VDDA
AOP
AON
GNDA
DeMod

28. Industrial Product Portfolio

29. Silicon Labs Industrial Portfolio
Si86xx
• 1-6 ch, 5kVrms
• Pin matched - ADI, TI
• Faster, less noise
Si88xx
• Si86xx + dc/dc
• 5W power, 80% eff
• Low noise
Si86xxT
• Si86xx + 10kV surge
• Reinforced VDE 0884
• Robust isolation
Si838x
• For PLC inputs
• 8 ch high speed
• Sinking/sourcing
Si823x
• Drives MOSFET
based systems
Si826x
• Replaces Opto-
drivers
Si828x
• Drives IGBT systems
Si827x
• Fast MOSFETs
• GaN FETs
Si8239x
• For 2.5 V VDD
systems
Si8920
• Analog isolator
• Differential I/O
• Current sensing using shunt
Digital Isolator
Analog Isolator
Isolated Gate Driver

30.  Evaluation kits
• Si838xISO-KIT: Hook up eight isolated PLC inputs on one board with Si838x
• Si88xxxISO-KIT: Experience plug-n-play signal & power isolation with the Si88241ED-IS
• Si8281-KIT: Fire up an IGBT using an Si8281CD-IS
• Si86xxTISO-KIT: Quick eval for the 10kV surge capable Si8642ET-IS
• Si8920ISO-KIT: Measure current on a high voltage rail easily with the Si8920BC-IP
 Application notes and white papers
• AN970: PLC Inputs Design Guide
• AN892: Design Guide for Isolated DC/DC Using the Si882xx/883xx
• AN901: Design Guide for Isolated DC/DC using the Si884xx/886xx
• AN486: High-Side Bootstrap Design Using ISOdrivers in Power Delivery Systems
• Pin-Compatible Digital Isolated Gate Drivers Make Life Easy for Power Designers
 Online tools
• Bootstrap Calculator
Development Tools for Isolation Products

31. Thank You! Any questions?
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