ISOW1044
SLLSFF7A – MAY 2021 – REVISED DECEMBER 2021
ISOW1044 Isolated CAN FD Transceiver with Integrated Low-Emissions, Low-Noise,
High-Efficiency DC-DC Converter
– UL 1577 component recognition program
– IEC 62368-1, IEC 61010-1, IEC 60601-1 and
1 Features
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Meets the requirements of ISO 11898-2:2016
physical layer standards
– Support of Classical CAN: 1 Mbps
– Optimized for CAN FD: 2 and 5 Mbps
Integrated DC-DC converter with low-emissions,
low-noise
– Meets CISPR 32 and EN 55032 Class B with
greater than 6 dB margin on a two-layer PCB
– Low frequency power converter at 25 MHz
enabling low noise performance
GB 4943.1-2011 certifications
2 Applications
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Factory Automation
Building Automation
Industrial Transport
Solar Inverters, Protection Relay
Motor Drives
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3 Description
The ISOW1044 device is a galvanically-isolated
controller area network (CAN) transceiver with a
built-in isolated DC-DC converter that eliminates the
need for a separate isolated power supply in space-
constrained isolated designs. The low-emissions,
isolated DC-DC meets CISPR 32 radiated emissions
Class B standard with just two ferrite beads on
a simple two-layer PCB. Additional 20 mA output
current can be used to power other circuits on the
board. An integrated 10 Mbps GPIO channel is
available and can help remove an additional digital
isolator or optocoupler for diagnotstics, LED indication
or supply monitoring.
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Additional 10 Mbps GPIO channel
High efficiency output power
– Typical efficiency: 47%
– Isolated output voltage accuracy: ± 5%
– Additional output current: 20 mA
Independent power supply for CAN & DC-DC
– Logic supply (VIO): 1.71 V to 5.5 V
– Power converter supply ( VDD): 4.5 V to 5.5 V
Fault-Protected CAN FD Transceiver
– DC Bus fault protection voltage: ± 58V
– Receiver common mode input voltage: ±12 V
– Remote wakeup via BUS wake-up pattern
Typical loop delay: 167 ns
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Device Information
Reinforced and Basic isolation options
High CMTI: 100-kV/µs (typical)
High ESD bus protection w.r.t GND2
FEATURE
ISOW1044
Reinforced
10 kVPK
ISOW1044B
Basic
Protection Level
Surge Test Voltage
Isolation Rating
Working Voltage
– HBM ESD: ±12 kV
7.8 kVPK
5000 VRMS
– IEC 61000-4-2 contact discharge: ±8 kV
Operating temperature range: -40°C to 125°C
Current limit and thermal shutdown
20-pin wide SOIC package
5000 VRMS
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1000 VRMS/1500 1000 VRMS/1500 VPK
VPK
Package
DFM (20)
DFM (20)
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Safety-Related Certifications planned:
Body Size (Nom)
12.83mm × 7.5 mm 12.83mm × 7.5 mm
– VDE Reinforced and Basic insulation per DIN
VDE V 0884-11:2017-01
VCC
Must be connected on PCB,
not connected internally
VIO
VISOIN
TXD
CANH
CAN
BUS
STB
Signal
RXD
CANL
OUT
Signal
Isolation
CAN
MCU
Isolation
IN
GNDIO
GISOIN
VDD
VISOOUT
GND2
DC-DC
Primary
DC-DC
Secondary
GND1
Galvanic Isolation
Barrier
Simplified Schematic
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.