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MAX14882
General Description
The MAX14882 isolated high-speed CAN transceiver
improves communication and safety by integrating galvanic isolation between the CAN-protocol controller-side
(TDX, RXD) of the device and the physical wires of the
CAN network (CANH, CANL) cable-side/bus-side of
the transceiver. Isolation improves communication by
breaking ground loops and reduces noise where large
differences in ground potentials exists between ports.
The MAX14882 provides up to 5000VRMS (60s) of
galvanic isolation and a continuous working voltage of up
to 848VRMS, while operating at the maximum high-speed
CAN data rate of 1Mbps.
The MAX14882 features additional integrated protection for
robust communication. The ±25V receiver input commonmode range exceeds the ISO 11898 specification requirement
of -2V to +7V. Additionally, the CANH and CANL IOs are
fault tolerant up to ±54V and are protected from electrostatic
discharge (ESD) up to ±15kV to GNDB on the bus-side, as
specified by the Human Body Model (HBM).
Interfacing with CAN-protocol controllers is simplified by
the wide 3.0V to 5.5V supply voltage range (VDDA) on the
controller-side of the device. The supply voltage range for
the CAN bus-side of the device is 4.5V to 5.5V (VDDB). An
integrated transformer driver and LDO can be used, with
an external transformer, to generate the isolated supply
for VDDB.
Field installation and troubleshooting are simplified by the
polarity select (POL) input. POL swaps the functions of
the CANH and CANL IOs, allowing for simple software
correction of cross-wired bus cables in the field.
The MAX14882 operates over the -40°C to +125°C
temperature range and is available in a 16-pin wide SOIC
(W SOIC) package with 8mm of creepage and clearance.
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
Benefits and Features
●● Integrated Protection for More Robust
Communication
• 5kVRMS Withstand Galvanic Isolation (60s)
• ±25V Common Mode Range
• ±54V Fault Protection
• ±15kV ESD (HBM) Protection on Driver Outputs/
Receiver Inputs
●● High-Performance Transceiver Enables Flexible
Designs
• Wide 3.0V to 5.5V Supply Voltage Range for CAN
Controller Interface
• Field Bus Polarity Control (POL)
• Integrated Transformer Driver for Power Transfer to
Bus-Side
• Integrated LDO for Powering CAN Bus-Side
●● Safety Regulatory Approvals (Pending)
• UL1577 (Basic Insulation)
• cUL According to CSA Bulletin 5A
Ordering Information appears at end of data sheet.
Simplified Block Diagram
3.3V
VDDA
VLDO
TD2
TD1
XFMR
DRIVER
5V LDO
POL
Applications
RXD
●● Industrial Controls
TXD
CANH
●● Building Automation
CANL
●● HVAC
●● Switching Gear
19-100246; Rev 1; 7/19
VDDB
MAX14882
GNDA
GNDB
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Absolute Maximum Ratings
VDDA to GNDA.........................................................-0.3V to +6V
VDDB to GNDB.........................................................-0.3V to +6V
VLDO to GNDB.......................................................-0.3V to +16V
TD1,TD2 to GNDA.................................................-0.3V to +12V
TXD, POL to GNDA..................................................-0.3V to +6V
RXD to GNDA......................................... -0.3V to (VDDA + 0.3V)
I.C. to GNDB........................................... -0.3V to (VDDB + 0.3V)
CANH or CANL to GNDB (Continuous)..................-54V to +54V
Short-Circuit Duration (CANH to CANL)....................Continuous
Short Circuit Duration (CAN_ to GNDB or VDDB)......Continuous
Short-Circuit Duration (RXD to GNDA or VDDA)........Continuous
TD1, TD2 Continuous Current............................................±1.4A
Continuous Power Dissipation (TA = +70°C)
16-pin W SOIC (Derate 14.1mW/°C above +70°C).... 1126.8mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -60°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
Wide 16-SOIC
PACKAGE CODE
W16+10
Outline Number
21-0042
Land Pattern Number
90-0107
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
107 ºC/W
Junction to Case (θJC)
22 ºC/W
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA)
71 ºC/W
Junction to Case (θJC)
23 ºC/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VDDA = 3.0V to 5.5V, VDDB = 4.5V to 5.5V, POL =GNDA, I.C. = GNDB, TA = -40°C to +125°C. Typical values are at VDDA = 3.3V,
VDDB = 5V, GNDA = GNDB, and TA = +25°C, unless otherwise noted. (Notes 1, 2) )
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER
Controller-Side (A-Side)
Voltage Supply
VDDA
3
5.5
V
Bus-Side (B-Side) Voltage
Supply
VDDB
4.5
5.5
V
Controller Side (A-Side)
Supply Current
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IDDA
POL = TXD = high
or low, RXD
unconnected,
TD1/TD2 unconnected
VDDA = 5V
4.7
7.7
VDDA = 3.3V
4.5
7.5
mA
Maxim Integrated │ 2
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Electrical Characteristics (continued)
(VDDA = 3.0V to 5.5V, VDDB = 4.5V to 5.5V, POL =GNDA, I.C. = GNDB, TA = -40°C to +125°C. Typical values are at VDDA = 3.3V,
VDDB = 5V, GNDA = GNDB, and TA = +25°C, unless otherwise noted. (Notes 1, 2) )
PARAMETER
Bus-Side (B-Side) Supply
Current
Controller-Side (A-Side)
Undervoltage Lockout
Threshold
Controller-Side (A-Side)
UVLO Hysteresis
Bus-Side (B-Side) Undervoltage Lockout Threshold
SYMBOL
IDDB
VUVLOA
CONDITIONS
VDDB = 5V
VDDA rising
VUVLOA_HYST VDDA falling
VUVLOB
MIN
TYP
MAX
TXD = GNDA, RL = open
9.4
15.5
TXD = GNDA, RL = 60Ω
52
76
TXD = VDDA, RL = 60Ω
8.5
TXD = GNDA, CANH
shorted to CANL
98
TXD = VDDA, CANH
shorted to CANL
8.5
130
RXD, TXD, POL
1.66
TD1, TD2
2.85
RXD, TXD, POL
50
TD1, TD2
200
VDDB rising
mA
V
mV
4.25
VDDB falling
UNITS
3.45
V
TRANSFORMER DRIVER
TD1, TD2 Output Resistance
RO
TD1, TD2 Current Limit
ILIM
Switching Frequency
fSW
Duty Cycle
Crossover Dead Time
TD1/TD2 = low, ITD_ = 300mA
0.6
1.5
4.5V ≤ VDDA ≤ 5.5V
540
785
1300
3.0V ≤ VDDA ≤ 3.6V
485
730
1170
350
450
550
Ω
mA
kHz
D
50
%
tDEAD
50
ns
LDO
LDO Supply Voltage
VLDO
LDO Output Voltage
VDDB
(Note 3)
4.68
4.5
LDO Current Limit
14
5
5.5
300
V
V
mA
Load Regulation
VLDO = 6V, ILOAD = 20mA to 40mA
0.19
Line Regulation
VLDO = 6V to 9.5V, ILOAD = 20mA
0.12
1.8
mV/mA
mV/V
Dropout Voltage
VLDO = 4.68V, IDDB = -120mA
100
Load Capacitance
Nominal value (Notes 4, 5)
180
mV
1
10
μF
CAN BUS DRIVER
Dominant Output Voltage
High
VCAN_DH
TXD = GNDA,
50Ω ≤ RL ≤ to 65Ω
CANH, POL = GNDA
2.75
4.5
CANL, POL = VDDA
2.75
4.5
Dominant Output Voltage
Low
VCAN_DL
TXD = GNDA,
50Ω ≤ RL ≤ to 65Ω
CANH, POL = GNDA
0.5
2.25
CANL, POL = VDDA
0.5
2.25
RCM = Open
1.5
3
RCM = 1.25kΩ,
-17V ≤ VCM ≤ +17V
1.5
3
RCM = 1.25kΩ,
-25V ≤ VCM ≤ +25V
1.1
3
Dominant Output Voltage,
Differential
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VOD
50Ω ≤ RL ≤ 65Ω,
Figure 1
V
V
V
Maxim Integrated │ 3
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Electrical Characteristics (continued)
(VDDA = 3.0V to 5.5V, VDDB = 4.5V to 5.5V, POL =GNDA, I.C. = GNDB, TA = -40°C to +125°C. Typical values are at VDDA = 3.3V,
VDDB = 5V, GNDA = GNDB, and TA = +25°C, unless otherwise noted. (Notes 1, 2) )
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CANH Recessive Output
Voltage
VCAN_HR
TXD = VDDA, no load
2
3
V
CANL Recessive Output
Voltage
VCAN_RL
TXD = VDDA, no load
2
3
V
RL = 60Ω
-12
+12
RL = Open
-50
+50
POL = GNDA,
CANH = GNDB
50
75
100
POL = VDDA,
CANL = GNDB
50
75
100
POL = GNDA,
CANL = VDDB
50
75
100
POL = VDDA,
CANH = VDDB
50
75
100
Recessive Output Voltage,
Differential
High-Side Short-Circuit
Current
Low-Side Short-Circuit
Current
TXD = VDDA
ISHORT_H
ISHORT_L
TXD = GNDA
TXD = GNDA
mV
mA
mA
RECEIVER
Common Mode Input Range
CANH or CANL to GNDB, RXD output valid
-25
0.5
Differential Input Voltage
(Recessive)
VID_R
|VCANH - VCANL|, TXD = VDDA
Differential Input Voltage
(Dominant)
VID_D
|VCANH - VCANL|, TXD = VDDA
Differential Input Resistance
V
V
0.9
Differential Input Hysteresis
Common-Mode Input
Resistance
+25
125
V
mV
RIN
TXD = VDDA, RIN = ΔV/ΔI, ΔV = +300mV
10
50
kΩ
RDIFF_IN
TXD = VDDA, RIN = ΔV/ΔI, ΔV = +300mV
20
100
kΩ
310
μA
Input Leakage Current
VDDB = GNDB, VCANH = VCANL = 5V
Input Capacitance
CANH or CANL to GNDB, TA = +25ºC (Note 4)
14.4
20
pF
Differential Input
Capacitance
CANH to CANL, TA = +25°C (Note 4)
7.2
10
pF
LOGIC INTERFACE (RXD, TXD, POL)
Input High Voltage
Input Low Voltage
VIH
POL, TXD to GNDA
VIL
POL, TXD to GNDA
0.7 x
VDDA
V
0.8
VHYS
Output High Voltage
VOH
RXD, IOUT = -4mA
Output Low Voltage
VOL
RXD, IOUT = 4mA
0.4
V
Input Pullup Current
IPU
TXD
-10
-4.5
-1.5
μA
Input Pulldown Current
IPD
POL
1.5
4.5
10
μA
Input Capacitance
CIN
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220
V
Input Hysteresis
mV
VDDA 0.4
V
2
pF
Maxim Integrated │ 4
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Electrical Characteristics (continued)
(VDDA = 3.0V to 5.5V, VDDB = 4.5V to 5.5V, POL =GNDA, I.C. = GNDB, TA = -40°C to +125°C. Typical values are at VDDA = 3.3V,
VDDB = 5V, GNDA = GNDB, and TA = +25°C, unless otherwise noted. (Notes 1, 2) )
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
+54
V
PROTECTION
Fault Protection Range
CANH, CANL to GNDB
ESD Protection
(CANH and CANL to GNDB)
ESD Protection
(CANH and CANL to GNDA)
ESD Protection
(All Other Pins)
Thermal Shutdown
Thermal Shutdown Hysteresis
-54
IEC 61000-4-2 Air-Gap Discharge
TSHDN
±10
IEC 61000-4-2 Contact Discharge
±5
Human Body Model (HBM)
±15
IEC 61000-4-2 Contact Discharge
±3
IEC 61000-4-2 Air Gap Discharge.
470pF capacitor connected between GNDA
and GNDB
±10
Human Body Model (HBM)
±2
kV
Junction temperature rising
+160
°C
13
°C
35
kV/μs
TSH_HYST
kV
kV
SWITCHING CHARACTERISTICS
Common-Mode Transient
Immunity
CMTI
(Note 6)
Driver Rise Time
tR
RCM is open, RL = 60Ω, CL = 100pF, 10% to
90% of transition on |VCANH - VCANL|, Figure 1
23
ns
Driver Fall Time
tF
RCM is open, RL = 60Ω, CL = 100pF, 90% to
10% of transition on |VCANH - VCANL|, Figure 1
31
ns
Dominant to recessive and recessive to
dominant, RL= 60Ω, CL = 100pF, CLR = 15pF,
Figure 2
215
ns
TXD to RXD Loop Delay
tLOOP
TXD Propagation Delay
tPDTXD_RD,
tPDTXD_DR
RCM is open, RL =
60Ω, CL = 100pF,
Figure 1
Recessive to dominant
80
Dominant to recessive
80
RXD Propagation Delay
tPDRXD_RD,
tPDRXD_DR
CLR = 15pF,
Figure 3
Recessive to dominant
135
Dominant to recessive
135
TXD Dominant Timeout
tDOM
(Note 7)
1.4
Undervoltage Threshold
Detection Time to Normal
Operation
ns
ns
4.8
ms
120
μs
INSULATION CHARACTERISTICS
Method B1 = VIORM x 1.875 (t = 1s, partial
discharge < 5pC)
2250
VP
VIORM
(Note 8)
1200
VP
Maximum Working Isolation
Voltage
VIOWM
(Note 8)
848
VRMS
Maximum Transient Isolation
Voltage
VIOTM
t = 1s
8400
VP
Partial Discharge Voltage
VPR
Maximum Repetitive Peak
Isolation Voltage
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Maxim Integrated │ 5
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Electrical Characteristics (continued)
(VDDA = 3.0V to 5.5V, VDDB = 4.5V to 5.5V, POL =GNDA, I.C. = GNDB, TA = -40°C to +125°C. Typical values are at VDDA = 3.3V,
VDDB = 5V, GNDA = GNDB, and TA = +25°C, unless otherwise noted. (Notes 1, 2) )
PARAMETER
SYMBOL
Maximum Withstand Isolation
Voltage
VISO
Maximum Surge Isolation
Voltage
VIOSM
CONDITIONS
t = 60s, f = 60Hz (Notes 8, 9)
Basic Insulation
MIN
TYP
MAX
UNITS
5000
VRMS
10
kV
>109
Ω
Insulation Resistance
RS
TA = +150°C, VIO = 500V
Barrier Capacitance
Input-to-Output
CIO
f = 1MHz
2
pF
Minimum Creepage
Distance
CPG
Wide SOIC
8
mm
Minimum Clearance
Distance
CLR
Wide SOIC
8
mm
0.015
mm
Internal Clearance
Comparative Tracking
Resistance Index
Climatic Category
Pollution Degree
(DIN VDE 0110, Table 1)
Distance through insulation
CTI
Material Group II (IEC 60112)
575
40/125/21
2
Note 1: All devices 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Specifications marked "GBD" are guaranteed by design and not production tested.
Note 2: All currents into the device are positive. All currents out of the device are negative. All voltages referenced to their respective
ground (GNDA or GNDB), unless otherwise noted.
Note 3: The maximum VLDO voltage listed in the Electrical Characteristics table indicates the voltage capability of the MAX14882.
Ambient temperature and power dissipation requirements of a given circuit may limit the allowable maximum VLDO to a
lower value during operation.
Note 4: Not production tested. Guaranteed by design (GBD) and characterization.
Note 5: Capacitance range for a stable output. Values are nominal and allow for normal capacitor tolerance.
Note 6: CMTI is the maximum sustainable common-mode voltage slew rate while maintaining the correct output states. CMTI
applies to both rising and falling common-mode voltage edges. Tested with the transient generator connected between
GNDA and GNDB.
Note 7: The dominant timeout feature releases the bus when TXD is held low longer than tDOM. CAN protocol guarantees a
maximum of 11 successive dominant bits in any transmission. The minimum data rate allowed by the dominant timeout,
then, is 11/tDOM(min)
Note 8: VIORM, VIOWM, and VISO are defined by the IEC 60747-5-5 standard
Note 9: Product is qualified VISO for 60 seconds. 100% production tested at 120% of VISO for 1 second.
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Maxim Integrated │ 6
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Test Circuits and Timing Diagrams
RCM
CANH
+
VOD
-
TXD
GNDA
RL
CL
VCM
CANL
RCM
GNDB
tRISE/FALL< 3ns for TXD
VDDA
50%
TXD
50%
GNDA
tPDTXD_RD
tPDTXD_DR
0.9V
VOD
0.5V
Figure 1. Transmitter Test Circuit and Timing Diagram
tRISE/FALL< 3ns for TXD
CANH
TXD
RL
VDDA
50%
TXD
CL
CANL
tLOOP2
GNDA
GNDA
VDDA
RXD
RXD
50%
CLR
GNDA
tLOOP1
tLOOP = tLOOP1 ≈ tLOOP2
Figure 2. Loop Delay Timing Diagram
CANH
RXD
CLR
CANL
+
VID
-
GNDA
GDNB
VID RISE/FALL TIME < 3ns
VID
0.9V
0.5V
tPDRXD_RD
RXD
tPDRXD_DR
VDDA
50%
50%
GNDA
Figure 3. Receiver Timing Diagram
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Maxim Integrated │ 7
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Typical Operating Characteristics
VDDA = 3.3V to GNDA, 60Ω load between CANH and CANL, GNDA = GNDB, TA = 25ºC, unless otherwise noted.
VDDB SUPPLY CURRENT
vs. TEMPERATURE
toc01
8
60
7
6
TXD = LOW, NO LOAD
IDDB (mA)
IDDA (mA)
TXD = HIGH
3
6
NO LOAD
40
4
5
TXD = LOW, 60Ω LOAD
30
TXD = LOW, NO LOAD
20
TXD = HIGH
0
10
-40 -25 -10 5
0
20 35 50 65 80 95 110 125
-40 -25 -10 5
(CANH-CANL) OUTPUT VOLTAGE
vs. TEMPERATURE
toc04
5.0
4.5
RL = 60Ω
3.5
20
3.0
CAN-CANL (V)
IDDB (mA)
25
15
NO LOAD
0.1
1
DATA RATE (MHz)
4.0
toc05
TXD = LOW
60Ω LOAD BETWEEN CANH AND CANL
2.5
2.0
1.5
1.0
5
0.5
0.01
0.1
0.0
1
-40 -25 -10 5
DATA RATE (MHz)
10
CANL SHORT CIRCUIT
CURRENT vs. VOLTAGE
toc06
0
80
SHORT CURRENT (mA)
-20
-30
-40
-50
-60
-70
toc07
100
-10
TXD = LOW
60
40
20
0
-80
-90
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
CANH SHORT-CIRCUIT
CURRENT vs. VOLTAGE
SHORT CURRENT (mA)
0.01
TEMPERATURE (ºC)
35
0
0
20 35 50 65 80 95 110 125
VDDB SUPPLY CURRENT
vs. DATA RATE
10
RL = 60Ω
3
1
TEMPERATURE (ºC)
30
4
2
2
1
toc03
7
50
TXD = LOW, 60Ω LOAD
5
VDDA SUPPLY CURRENT
vs. DATA RATE
toc02
IDDA (mA)
VDDA SUPPLY CURRENT
vs. TEMPERATURE
TXD = LOW
-20
-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60
CANH VOLTAGE (V)
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-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60
CANL VOLTAGE (V)
Maxim Integrated │ 8
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Typical Operating Characteristics (continued)
VDDA = 3.3V to GNDA, 60Ω load between CANH and CANL, GNDA = GNDB, TA = 25ºC, unless otherwise noted.
(CANH-CANL) VOLTAGE
vs. LOAD RESISTANCE
TXD PROPAGATION DELAY
vs. TEMPERATURE
toc08
5.0
4.5
TXD = LOW
80
PROPAGATION DELAY (ns)
4.0
(CANH-CANL) (V)
3.5
3.0
2.5
2.0
120Ω LOAD LINE
1.5
1.0
60Ω LOAD LINE
0.5
0.0
0
5
10
toc09
90
15
20
25
70
tPDTXD_DR
60
50
40
30
20
tPDTXD_RD
CL = 100pF
RL = 60Ω
10
30
35
0
40
-40 -25 -10 5
LOAD CURRENT (mA)
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
RXD PROPAGATION DELAY
vs. TEMPERATURE
110
TRANSFORMER SWITCHING
FREQUENCY vs.TEMPERATURE
toc10
toc11
600
100
SWITCHING FREQUENCY (kHz)
PROPAGATION DELAY (ns)
90
80
70
tPDRXD_DR
tPDRXD_RD
60
50
40
30
20
500
450
400
350
15pF LOAD ON RXD
10
0
550
300
-40 -25 -10 5
20 35 50 65 80 95 110 125
-40 -25 -10 5
20 35 50 65 80 95 110 125
TEMPERATURE (ºC)
TEMPERATURE (ºC)
TD1/TD2 VOLTAGE
vs. LOAD CURRENT
TRANSFORMER DRIVER
toc12
600
toc13
DRIVE VOLTAGE (mV)
500
400
TD1/TD2
2V/div
300
200
0V
100
100mA load on VDDB
0
0
100
200
300
400
500
600
700
400ns/div
SINK CURRENT (mA)
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Maxim Integrated │ 9
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Pin Configuration
TOP VIEW
TD1
1
16 VDDB
TD2
2
15 GNDB
GNDA
3
VDDA
4
13 CANH
RXD
5
12 CANL
N.C.
6
11 I.C.
POL
7
10 VLDO
TXD
8
9
MAX14882
14 I.C.
GNDB
SOIC (W)
Pin Description
PIN
NAME
FUNCTION
REF
SUPPLY
TYPE
Analog
CONTROLLER-SIDE (A-SIDE)
1
TD1
Transformer Driver Output 1
GNDA
2
TD2
Transformer Driver Output 2
GNDA
Analog
3
GNDA
Controller-Side/A-Side Ground. GNDA is the ground reference for POL, TXD, and RXD.
—
Ground
4
VDDA
Power Supply Input for the Controller-Side/A-Side. Bypass VDDA to GNDA with both a
0.1μF and a 1μF capacitor as close to the device as possible.
GNDA
Power
5
RXD
Receiver Output. RXD is high when the bus is in the recessive state. RXD is low when the
bus is in the dominant state.
GNDA
Digital
Output
6
N.C.
No Connection. Not internally connected. Connect to GNDA, VDDA, or leave unconnected.
GNDA
7
POL
Polarity Set Input. Drive POL low for normal CANH, CANL operation (CANH is high and
CANL is low when TXD is low). Drive POL high to swap the functions of CANH and CANL
(CANH is low and CANL is high when TXD is low). See Table 1for more information.
GNDA
Digital
Input
8
TXD
Transmit Data Input. CANH and CANL are in the dominant state when TXD is low. CANH
and CANL are in the recessive state when TXD is high.
GNDA
Digital
Input
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Maxim Integrated │ 10
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Pin Description (continued)
FUNCTION
REF
SUPPLY
TYPE
GNDB
Bus-Side/B-Side Ground. GNDB is the ground reference for VLDO, VDDB, CANH, and CANL.
—
Ground
10
VLDO
LDO Power Input. Connect a minimum voltage of 4.68V to VLDO to power the bus-side of the
transceiver. Bypass VLDO to GNDB with both 0.1μF and 1μF capacitors as close as possible
to the device. To disable the internal LDO, leave VLDO unconnected or connect to GNDB.
GNDB
Power
Input
11, 14
I.C.
Internally Connected. Connect to GNDB.
GNDB
12
CANL
Low-Level CAN Differential Bus Line
GNDB
Differential
I/O
13
CANH
High-Level CAN Differential Bus Line
GNDB
Differential
I/O
VDDB
Bus-Side Power Input/LDO Power Output. Bypass VDDB to GNDB with both 0.1μF and
1μF capacitors as close as possible to the device. VDDB is the output of the internal LDO
when power is applied to VLDO. When the internal LDO is not used (VLDO is unconnected
or connected to GNDB), VDDB is the positive supply input for the bus-side of the IC.
GNDB
Power
PIN
NAME
CAN BUS-SIDE (B-SIDE)
9, 15
16
Detailed Description
The MAX14882 isolated controller area network (CAN)
transceiver provides 5000VRMS (60s) of galvanic isolation
between the cable-side (B-side) of the transceiver and
the controller-side (A-side). This device allows up to
1Mbps communication across the isolation barrier when
a large potential exists between grounds on each side
of the barrier. CANH and CANL outputs are short-circuit
current-limited and are protected against excessive power
dissipation by thermal shutdown circuitry that places the
driver outputs in a high-impedance state.
Isolation
Both data and power can be transmitted across the isolation
barrier. Data isolation is achieved using integrated capacitive isolation that allows data transmission between the
controller-side and the cable-side of the transceiver.
To achieve power isolation, the MAX14882 features an
integrated transformer driver to drive an external centertapped transformer, allowing the transfer of operating
power from the controller-side, across the isolation
barrier, to the cable-side. Connect the primary side of
the external transformer to the MAX14882’s transformer
driver outputs (TD1 and TD2).
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Fault Protection
The MAX14882 features ±54V fault protection on the
CANH and CANL bus lines. When CANH or CANL is pulled
above +30V (typ) or below -30V (typ), the I/O is set to
high-impedance. This wide fault protection range simplifies
selecting external TVS components for surge protection.
Transmitter
The transmitter converts a single-ended input signal
(TXD) from the CAN controller to differential outputs
for the bus lines (CANH, CANL). The truth table for the
transmitter and receiver is given in Table 1.
Transmitter Dominant Timeout
The MAX14882 features a transmitter-dominant timeout
(tDOM) that prevents erroneous CAN controllers from
clamping the bus to a dominant level by maintaining a
continuous low TXD signal. When TXD remains in the
dominant state (low) for greater than tDOM, the transmitter
is disabled, releasing the bus to a recessive state (Table 1).
After a dominant timeout fault, normal transmitter function
is re-enabled on the rising edge of a TXD. The transmitterdominant timeout limits the minimum possible data rate to
7.86kbps for standard CAN protocol.
Maxim Integrated │ 11
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Transmitter and Receiver Functionality When Not Connected to the Bus
Table 1. Transmitter and Receiver Functionality when Not Connected to the Bus
POL
TXD
TXD LOW TIME
CANH
CANL
BUS STATE
RXD
L
L
< tDOM
H
L
Dominant
L
L
L
≥ tDOM
VDDB/2
VDDB/2
Recessive
H
L
H
X
VDDB/2
VDDB/2
Recessive
H
H
L
< tDOM
L
H
Dominant
L
H
L
≥ tDOM
VDDB/2
VDDB/2
Recessive
H
H
H
X
VDDB/2
VDDB/2
Recessive
H
X = Don't care
Driver Output Protection
The MAX14882 features integrated circuitry to protect the
transmitter output stage against a short-circuit to a positive
or negative voltage by limiting the driver current. The
transmitter returns to normal operation once the short is
removed.
Thermal shutdown further protects the transceiver from
excessive temperatures that may result from a short by
setting the transmitter outputs to high impedance when
the junction temperature exceeds +160°C (typ). The
transmitter returns to normal operation when the junction
temperature falls below the thermal shutdown hysteresis.
Receiver
The receiver reads the differential input from the bus
(CANH, CANL) and transfers this data as a single-ended
output (RXD) to the CAN controller. During normal operation, a comparator senses the difference between CANH
and CANL, VDIFF = |VCANH - VCANL|, with respect to an
internal threshold of 0.7V (typ). If VDIFF > 0.9V, a logiclow is present on RXD. If VDIFF < 0.5V, a logic-high is
present.
Transformer Driver
Overcurrent Limiting
The MAX14882 features overcurrent limiting to protect
the integrated transformer driver from excessive currents
when charging large capacitive loads or driving into shortcircuits. Current limiting is achieved in two stages: internal
circuitry monitors the output current and detects when the
peak current rises above 1.2A.
When the 1.2A threshold is exceeded, internal circuitry
reduces the output current to the 730mA current-limit. The
MAX14882 monitor the driver current on a cycle-by-cycle
basis and limit the current until the short is removed.
The transformer driver on the MAX14882 can
dissipate large amounts of power during overcurrent
limiting,causing the IC to enter thermal shutdown. When
the junction temperature exceeds the thermal shutdown
threshold, the TD1 and TD2 driver outputs are disabled.
The driver resumes normal operation when the temperature
falls below the thermal shutdown temperature minus the
hysteresis.
The CANH and CANL common-mode range is ±25V. RXD
is logic-high when CANH and CANL are shorted or terminated
and undriven.
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Maxim Integrated │ 12
MAX14882
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
Transformer Selection
Applications Information
The integrated push-pull transformer driver allows the
transmission of operating power from the logic side,
across the isolation barrier, to the isolated field side of the
device. The 450kHz (typ) transformer driver operates with
center-tapped primary transformers. Select a transformer
with an ET product greater than or equal to the ET of
the driver to ensure that the transformer does not enter
saturation. E is the voltage applied to the transformer and
T is the maximum time it is applied during any one cycle.
Calculate the minimum ET product for the transformer
primary as:
ET = VMAX/(2 x fMIN)
where VMAX is the worst-case maximum supply voltage
on VDDA and fMIN is the minimum frequency at that
supply voltage. For example, using 5.5V and 350kHz, the
required minimum ET product is 7.9Vμs.
Reduced EMI and Reflections
In multidrop CAN applications, it is important to maintain
a single linear bus, of uniform impedance, that is properly
terminated at each end. Do not use a star configuration.
Any deviation from the end-to-end wiring scheme
creates a stub. High-speed data edges on a stub can
create reflections back down the bus and can cause
data errors, by eroding the noise margin of the system.
Although stubs are unavoidable in a multidrop system,
care should be taken to keep these stubs as short as
possible, especially when operating with high data rates.
Table 2 shows a list of recommended transformers to use
with the MAX14882.
Recommended Transformers
Table 2. Recommended Transformers
MANUFACTURER
PART
APPLICATION
NUMBER
Wurth
750315225
Wurth
Wurth
TURNS
RATIO
OPERATING
CURRENT
(mA)
DIMENSIONS
(L x W x H) (mm)
9.44
200
6.73 x 7.14 x 4.19
9.44
200
6.73 x 7.14 x 4.19
9.44
200
6.73 x 7.14 x 4.19
ISOLATION OPERATING ET CONSTANT
(VRMS)
TEMP
(V x μs, MIN)
5V to 5V
1CT:1.1CT
2750
750315226
5V to 5V
1CT:1.3CT
2750
750315227
3.3V to 5V
1CT:1.7CT
2750
Wurth
750315228
3.3V to 5V
1CT:2CT
2750
9.44
160
6.73 x 7.14 x 4.19
Wurth
750315229
5V to 5V
1CT:1.13CT
5000
10.7
200
9.14 x 8.00 x 7.62
Wurth
750315230
5V to 5V
1CT:1.38CT
5000
10.7
150
9.14 x 8.00 x 7.62
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-40°C to
+125°C
-40°C to
+125°C
Maxim Integrated │ 13
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Typical Application Circuit
3.3V
3.3V
2
2
3
3
1
4
VLDO
VDDB
VDDA
RX
RXD
TX
TXD
GPIO
POL
VLDO
VDDB
2
CANH
CANH
2
3
RXD
RX
TXD
TX
POL
GPIO
CANL
MAX14882
1
VDDA
3
CANL
1
TD2 TD1
MICROCONTROLLER
MICROCONTROLLER
TD1 TD2
MAX14882
2
3
4
4
Ordering Information
ISOLATION
RATING
V DDA SUPPLY
POL
V DDB LDO
VOLTAGE
TRANSFORMER
DRIVER
PACKAGE
MAX14882AWE+
5kVRMS
3.0V to 5.5V
YES
5V
YES
16 SOIC (W)
MAX14882AWE+T
5kVRMS
3.0V to 5.5V
YES
5V
YES
16 SOIC (W)
PART
+Denotes a lead (Pb)-free/RoHS-compliant package
T = Tape and Reel
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Maxim Integrated │ 14
5kVRMS Isolated CAN Transceiver
with Integrated Transformer Driver
MAX14882
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
0
2/18
Initial release
1
7/19
Updated the Electrical Characteristics table
PAGES
CHANGED
—
5‒6
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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