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MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
General Description
The MAX3054/MAX3055/MAX3056 are interfaces
between the protocol controller and the physical wires
of the bus lines in a controller area network (CAN). The
devices provide differential transmit capability and switch
to single-mode if certain fault conditions occur. The
MAX3054/MAX3055/MAX3056 guarantee full wakeup
capability during failure modes.
The extended fault-protected voltage range of CANH and
CANL bus lines of ±80V. Current-limiting and thermalprotection circuits protect the transmitter output stage
against overcurrent faults to prevent destruction of the
transmitter output stage. The CANH and CANL lines are
also protected against electrical transients that may occur
in rugged environments.
The transceiver provides three low-power modes that
can be entered and exited through pins STB and EN. An
output INH pin can be used for deactivation of an external
voltage regulator.
The MAX3054/MAX3055/MAX3056 are designed to provide optimal operation for a specified data rate. The
MAX3054 is ideal for high data rates of 250kbps.
The MAX3055 is used for data rates of 125kbps and
the MAX3056 is designed for 40kbps applications. For
40kbps and 125kbps versions, a built-in slope-control
feature allows the use of unshielded cables, and receiver
input filters guarantee high noise immunity.
Applications
● Industrial HVAC
Features
● ±80V Fault Protection
● Low RFI/Excellent EMC Immunity
● Full Wake-Up Capability During Failure Modes
● Bus Failure Management
● Support Single-Wire Transmission Mode with
Ground Offset Voltages Up to 1.5V
● Thermally Protected
● Do Not Disturb the Bus Line when Unpowered
● Low-Current Sleep and Standby Mode with Wake-Up
Through Bus Lines
● Up to 250kbps Data Rate (MAX3054)
● Pin and Functionally Compatible with TJA1054
Ordering Information
PART
TEMP RANGE
DATA
RATE
MAX3054ASD+
-40°C to +125°C
250kbps
14 SO
MAX3055ASD+
-40°C to +125°C
Slew control
125kbps
14 SO
MAX3056ASD+
-40°C to +125°C
Slew control
40kbps
14 SO
+Lead-free/RoHS-compliant package
Typical Operating Circuit
Pin Configuration
VBATT +12V
TOP VIEW
BATTERY
CAN CONTROLLER
+5V
2
3
TXD RXD
7
PINPACKAGE
WAKE
RTH
8
5
STB
6
EN
4
1
ERR INH
10
VCC
MAX305_
CANH CANL
11
12
GND
BATT
RTL
13
INH 1
14 BATT
TXD
2
13 GND
RXD
3
ERR 4
100nF
STB 5
14
9
FAULT
TO 80V
MAX3054
MAX3055
MAX3056
12 CANL
11 CANH
10 VCC
EN 6
9
RTL
WAKE 7
8
RTH
SO
CAN BUS
19-2687; Rev 2; 2/21
© 2022 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A.
|
Tel: 781.329.4700
|
© 2022 Analog Devices, Inc. All rights reserved.
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Absolute Maximum Ratings
(All Voltages are Referenced to GND)
Supply Voltage (VCC)...............................................-0.3V to +6V
Battery Voltage (VBATT).........................................-0.3V to +80V
TXD, RXD, ERR, STB, EN........................ -0.3V to (VCC + 0.3V)
CANH, CANL...........................................................-80V to +80V
RTH, RTL...............................................................-0.3V to +80V
RTH, RTL Current...........................................................±180mA
WAKE.....................................................................-0.3V to +80V
INH.........................................................-0.3V to (VBATT + 0.3V)
INH Current.......................................................................-0.5mA
Transient Voltage (ISO 7637)................................. -200V, +200V
Continuous Power Dissipation (TA = +70°C)
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°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.
DC Electrical Characteristics
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Dominant normal operating mode, no load,
TXD = 0
16
30
Recessive normal operating mode,
TXD = VCC
4
10
Low-power modes:
VTXD = VCC, VBATT = 14V
3
10
µA
54
125
µA
3.5
V
VOLTAGE SUPPLIES
Supply Current
Battery Current
Battery Power on Flag Threshold
STB, EN, AND TXD
ICC
IBATT
VPWRON
Low-power modes at VTRL = VBATT,
VBATT = VWAKE = VINH = 5V to 27V
Low-power modes
High-Level Input Voltage
VIH
Low-Level Input Voltage
VIL
High-Level Input Current
IIH
VIN = 4V
Low-Level Input Current
IIL
VIN = 1V
mA
5
1.0
2.4
V
0.8
Supply Voltage—Forced Standby
Mode (Fail-Safe)
VFS
VBATT = 14V
High-Level Output Voltage
VOH
IOUT = -1mA
Low-Level Output Voltage
VOL
IOUT = 7.5mA
STB and EN
TXD
STB and EN
TXD
9
20
-200
-80
-25
4
8
-800
-320
2.75
-100
V
µA
µA
4.50
V
VCC
V
0.9
V
RXD AND ERR
WAKE
Wake-Up Threshold Voltage
Low-Level Input Current
www.analog.com
VTH(WAKE)
IIL(WAKE)
VCC - 0.5
0
VSTB = 0V
2.0
2.7
3.4
V
VWAKE = 0V
-10
-4
-1
µA
Analog Devices │ 2
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
DC Electrical Characteristics (continued)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INH
High-Level Voltage Drop
Leakage Current
ΔVH
ILEAK(INH)
INH = -0.18mA, standby mode
Sleep mode, VINH = 0V
0.8
V
5
µA
CANH, CANL
VCC = 5V, no failures and bus failures 1,
2, 5, 9
-3.5
-3.2
-2.9
Differential Receiver Threshold
VDIFF
Differential Receiver Hysteresis
HYST
No failures and bus failures 1, 2, 5, 9
CANH Recessive Output Voltage
VOCH
TXD = VCC, RTH < 4kΩ
CANL Recessive Output Voltage
VOCL
TXD = VCC, RTH < 4kΩ
VCC - 0.2
V
CANH Dominant Output Voltage
VOCHDOM
TXD = 0V, R1 = 100Ω
VCC - 1.4
V
CANL Dominant Output Voltage
VOCLDOM
TXD = 0V, R1 = 100Ω
CANH Output Current
IO(CANH)
CANL Output Current
IO(CANL)
VCC = 4.75V to 5.25V, no failures and bus
failures 1, 2, 5, 9
-0.70 x
VCC
-0.58 x
VCC
18
mV
200
1.4
VCANH = 0V, TXD = 0V
-150
Low-power modes, VCANH = 0V, VCC = 5V
-10
VCANL = 14V, TXD = 0V
V
-86
mV
V
mA
µA
75
130
mA
20
µA
0.30 x
VCC
0.37 x
VCC
V
Low-power modes
1.1
2.5
3.9
V
Low-power modes, VCANL = 42V,
VBATT = 42V, RTL = open
VCC = 4.75V to 5.25V
Voltage Detection Threshold for
Short Circuit to Battery on CANH
VDET(CANH)
Voltage Detection Threshold for
Short Circuit to GND on CANL
VDTG(CANL)
Low-power modes
2.5
Voltage Detection Threshold for
Short Circuit to Battery on CANL
VDET(CANL)
Normal mode, VCC = 5V
6.4
7.3
8.2
V
CANL Wake-Up Threshold
VTHL(WAKE)
Low-power modes
2.5
3.2
3.9
V
CANH Wake-Up Threshold
VTHH(WAKE)
Low-power modes
1.1
1.8
2.5
V
VCC = 5V
1.50
1.70
1.85
VCC = 4.75V to 5.25V
0.30 x
VCC
CANH Single-Ended Receiver
Threshold (Failures 4, 6, 7)
VSE(CANH)
CANH Single-Ended Receiver
Hysteresis
HYST
www.analog.com
0.37 x
VCC
10
V
mV
Analog Devices │ 3
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
DC Electrical Characteristics (continued)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CANL Single-Ended Receiver
Threshold
VSE(CANL)
CANL Single-Ended Receiver
Hysteresis
HYST
CONDITIONS
VCC = 5V
VCC = 4.75V to 5.25V
MIN
TYP
MAX
3.15
3.30
3.45
0.63 x
VCC
Failures 3, 8
0.69 x
VCC
10
UNITS
V
mV
RTL AND RTH
RTL to VCC Switch
On-Resistance
RSW(RTL)
IO = -10mA
36
100
Ω
RTH to VCC Switch
On-Resistance
RSW(RTH)
IO = 10mA
23
100
Ω
-1.25
-0.65
-0.30
mA
Output Current on Pin RTL
IO(RTL)
Low-power modes, VRTL = 0
RTL Pullup Current
|IPU(RTL)|
Normal and failures 4, 6, 7, RTL = 0V
20
107
200
µA
RTH Pulldown
|IPU(RTH)|
Normal and failures 3, 8, RTL = VCC
20
106
200
µA
THERMAL SHUTDOWN
Shutdown Junction Temperature
Thermal Protection Hysteresis
TJ
TJF6
For shutdown
165
During failure 6—switch off CANL only
140
THYS
°C
15
°C
AC Electrical Characteristics
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, and TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TRANSITION TIME
CL = 330pF, MAX3054 (250kbps)
CANL and CANH Bus Output
Transition Time Recessive to
Dominant (10% to 90%)
t(r-d)
CANL and CANH Bus Output
Transition Time Dominant to
Recessive (10% to 90%)
t(d-r)
38
CL = 220pF to 3.3nF, MAX3055 (125kbps)
100
700
CL = 560pF to 10nF, MAX3056 (40kbps)
0.7
3.3
CL = 330pF, MAX3054 (250kbps)
130
CL = 220pF to 1nF, MAX3055 (125kbps)
200
1200
CL = 560pF to 3.3nF, MAX3056 (40kbps)
0.5
2.8
ns
µs
ns
µs
PROPAGATION DELAY TXD TO RXD LOW—DOMINANT TRANSMISSION (FIGURES 1, 2)
Differential Reception
www.analog.com
tPDLD
No failures, CL = 330pF, MAX3054
(250kbps)
600
Bus failures 1, 2, 5, 9,
CL = 330pF, MAX3054 (250kbps)
750
No failures and bus failures 1, 2, 5, 9,
CL = 1nF, MAX3055 (125kbps)
1.5
No failures and bus failures 1, 2, 5, 9,
CL = 3.3nF, MAX3056 (40kbps)
4.7
ns
µs
Analog Devices │ 4
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
AC Electrical Characteristics (continued)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, and TA = +25°C.) (Notes 1, 2)
PARAMETER
Single-Ended Reception
SYMBOL
tPDLSE
MAX
UNITS
Bus failures 3, 4, 6, 7, 8,
CL = 330pF, MAX3054 (250kbps)
CONDITIONS
MIN
TYP
750
ns
Bus failures 3, 4, 6, 7, 8,
CL = 1nF, MAX3055 (125kbps)
1. 5
Bus failures 3, 4, 6, 7, 8,
CL = 3.3nF, MAX3056 (40kbps)
4.7
µs
PROPAGATION DELAY TXD TO RXD HIGH—RECESSIVE TRANSMISSION (FIGURES 1, 2)
Differential Reception
Single-Ended Reception
tPDHD
tPDHSE
No failures and bus failures 1, 2, 5, 9,
CL = 330pF, MAX3054 (250kbps)
950
No failures and bus failures 1, 2, 5, 9,
CL = 1nF, MAX3055 (125kbps)
1.9
No failures and bus failures 1, 2, 5, 9,
CL = 3.3nF, MAX3056 (40kbps)
5.95
Bus failures 3, 4, 6, 7, 8,
CL = 330pF, MAX3054 (250kbps)
950
Bus failures 3, 4, 6, 7, 8,
CL = 1nF, MAX3055 (125kbps)
1.9
Bus failures 3, 4, 6, 7, 8,
CL = 3.3nF, MAX3056 (40kbps)
5.95
ns
µs
ns
µs
WAKE-UP TIMING
Minimum Time for Wake-Up on
CANL and CANH or WAKE
tWAKE
WAKE
8
38
µs
FAILURES TIMING
Normal and MAX3054 (250kbps),
low-power MAX3055 (125kbps)
mode
MAX3056 (40kbps)
Failures 3 and 8 Detection Time
Failures 4 and 7 Detection Time
Failure 6 Detection Time
www.analog.com
tDET
1.9
5.7
9.5
5.5
16.5
27.0
0.3
1
1.9
1.0
3.2
5.5
MAX3054 (250kbps),
MAX3055 (125kbps)
0.35
1.1
1.85
MAX3056 (40kbps)
0.93
2.97
5.00
Normal and MAX3054 (250kbps),
low-power MAX3055 (125kbps)
mode
MAX3056 (40kbps)
Normal
mode
ms
Analog Devices │ 5
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
AC Electrical Characteristics (continued)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, and TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
Failures 3 and 8 Recovery Time
Normal
mode
Failures 4 and 7 Recovery Time
tREC
Low-power
mode
Normal
mode
Failure 6 Recovery Time
Minimum Hold Time of
Go-to-Sleep Command
Disable Time of TXD Permanent
Dominant Timer
Pulse Count Difference for
Failures 1, 2, 5, 9 Detection (ERR
Becomes Low)
Pulse Count Difference for
Failures 1, 2, 5, 9 Recovery (ERR
Becomes High)
MIN
TYP
MAX
0.36
1.14
1.90
1.0
3.2
5.5
MAX3054 (250kbps)
1.7
5.6
9.5
MAX3055 (125kbps)
7
23
38
MAX3056 (40kbps)
Normal and MAX3054 (250kbps),
low-power MAX3055 (125kbps)
mode
MAX3056 (40kbps)
22
70
119
MAX3054 (250kbps),
MAX3055 (125kbps)
0.35
1.1
1.85
MAX3056 (40kbps)
1.0
3.2
5.5
MAX3054 (250kbps),
MAX3055 (125kbps)
150
525
900
MAX3056 (40kbps)
390
1445
2500
tHMIN
tDIS(TXD)
VTXD = 0
5
50
MAX3054 (250kbps),
MAX3055 (125kbps)
0.9
4.5
MAX3056 (40kbps)
2.34
12.50
UNITS
ms
µs
ms
µs
µs
ms
4
Count
3
4
5
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground, unless otherwise noted.
Note 2: Failure modes 1 through 9 are explained in Table 1 and in the Detailed Description section.
www.analog.com
Analog Devices │ 6
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Timing Diagrams/Test Circuits
+5V
VTXD
VCC
10
GND
5V
3.6V
1.4V
0
VCANL
VCANH
7
2
2.2V
-5V
VRXD
VCC/2
tPDL
5
STB
RTH
WAKE
CANL
TXD
1
VBATT
CBYPASS
14
CANH
INH
RTL
BATT
ERR
4
tPDH
6
EN
8
R1
CL
R1
CL
12
MAX305_
-3.2V
VDIFF
VCC
GND
11
9
RXD
13
3
VDIFF = CANH - CANL
CX = 15pF
PROBE CAP INCLUDED
Figure 1. Timing Diagram for Dynamic Characteristic
Figure 2. Test Circuit for Dynamic Characteristics
+5V
10
7
VCC
6
5
EN
STB
RTH
WAKE
8
125Ω
CL
511Ω
2
CANL
TXD
12
MAX305_
1
+12V
CANH
INH
11
511Ω
14
CBYPASS
RTL
BATT
ERR
4
GND
13
RXD
3
9
125Ω
CL
CX = 15pF
PROBE CAP INCLUDED
Figure 3. Test Circuit for Typical Operating Characteristics
www.analog.com
Analog Devices │ 7
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Typical Operating Characteristics
(VCC = +5V, VBATT = 12V, and TA = +25°C. RTL = RTH = 511Ω, R1 = 125Ω, see Test Circuit Figure 3.)
MAX3054
SUPPLY CURRENT vs. DATA RATE
26
59
92
MAX3056
SUPPLY CURRENT vs. DATA RATE
MAX3054 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc04
36
TA = +25°C
35
TA = -40°C
34
20
30
400
RECESSIVE
350
200
DOMINANT
-50
-15
20
55
25
50
MAX3054/MAX3055/MAX3056 toc03
75
100
90
600
500
400
DOMINANT
300
200
125
RECESSIVE
-50
-15
20
55
90
TEMPERATURE (°C)
MAX3056 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3055 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
1.0
RECESSIVE
0.5
-50
-15
20
55
TEMPERATURE (°C)
www.analog.com
90
125
CL = 330pF
175
DOMINANT
150
RECESSIVE
125
100
-50
-15
20
55
TEMPERATURE (°C)
90
125
700
DRIVER PROPAGATION DELAY (µs)
1.5
200
CL = 1nF
DOMINANT
600
500
125
MAX3054/MAX3055/MAX3056 toc09
TEMPERATURE (°C)
CL = 3.3nF
125
MAX3055 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
300
250
0
DATA RATE (kbps)
DOMINANT
0
450
40
MAX3054/MAX3055/MAX3056 toc07
RECEIVER PROPAGATION DELAY (µs)
2.0
10
0
TA = -40°C
34
DATA RATE (kbps)
MAX3054/MAX3055/MAX3056 toc08
SUPPLY CURRENT (mA)
TA = +125°C
TA = +25°C
35
32
50 100 150 200 250 300 350 400 450 500
0
DATA RATE (kbps)
37
TA = +125°C
33
TEMPERATURE (°C)
38
33
32
125
36
MAX3054/MAX3055/MAX3056 toc06
-7
TA = -40°C
34
MAX3054/MAX3055/MAX3056 toc05
-40
35
33
MAX3056
RECEIVER PROPAGATION DELAY (ns)
0
TA = +25°C
RECEIVER PROPAGATION DELAY (ns)
5
36
MAX3055
SUPPLY CURRENT vs. DATA RATE
37
SUPPLY CURRENT (mA)
10
MAX3054/MAX3055/MAX3056 toc02
15
TA = +125°C
RECEIVER PROPAGATION DELAY (ns)
SLEW RATE (V/µs)
MAX3055
37
SUPPLY CURRENT (mA)
20
MAX3054/MAX3055/MAX3056 toc01
SLEW RATE vs. TEMPERATURE
RECESSIVE TO DOMINANT
RECESSIVE
400
300
-50
-15
20
55
90
125
TEMPERATURE (°C)
Analog Devices │ 8
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Typical Operating Characteristics (continued)
(VCC = +5V, VBATT = 12V, and TA = +25°C. RTL = RTH = 511Ω, R1 = 125Ω, see Test Circuit Figure 3.)
RECESSIVE
2.5
DOMINANT
2.0
2.5
TA = +125°C
2.0
1.5
TA = +25°C
1.0
-50
-15
20
55
90
0
125
TA = -40°C
0
5
DIFFERENTIAL VOLTAGE
vs. LOAD RESISTANCE
10
15
20
25
30
0
TA = -40°C
0
3
6
12
15
18
TA = -40°C
DIFFERENTIAL
INPUT
5V/div
RXD
5V/div
1
0
9
OUTPUT CURRENT (mA)
MAX3054/MAX3055/MAX3056 toc14
3
2
TA = +25°C
1.2
MAX3054
RECEIVER PROPAGATION DELAY
TA = +125°C
TA = +25°C
1.8
MAX3054/MAX3055/MAX3056 toc13
DIFFERENTIAL VOLTAGE (V)
4
TA = +125°C
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
5
2.4
0.6
0.5
1.5
RECEIVER OUTPUT HIGH
vs. OUTPUT CURRENT
3.0
VOLTAGE RXD (V)
3.0
3.0
MAX3054/MAX3055/MAX3056 toc11
CL = 3.3nF
VOLTAGE RXD (V)
MAX3054/MAX3055/MAX3056 toc10
DRIVER PROPAGATION DELAY (µs)
3.5
RECEIVER OUTPUT LOW
vs. OUTPUT CURRENT
MAX3054/MAX3055/MAX3056 toc12
MAX3056 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
100
0
200
300
400
500
200ns/div
LOAD RESISTANCE (Ω)
MAX3055
RECEIVER PROPAGATION DELAY
MAX3056
RECEIVER PROPAGATION DELAY
MAX3054/MAX3055/MAX3056 toc15
400ns/div
www.analog.com
MAX3054/MAX3055/MAX3056 toc16
DIFFERENTIAL
INPUT
5V/div
DIFFERENTIAL
INPUT
5V/div
RXD
5V/div
RXD
5V/div
1µs/div
Analog Devices │ 9
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Typical Operating Characteristics (continued)
(VCC = +5V, VBATT = 12V, and TA = +25°C. RTL = RTH = 511Ω, R1 = 125Ω, see Test Circuit Figure 3.)
DRIVER PROPAGATION DELAY
RECESSIVE TO DOMINANT
DRIVER PROPAGATION DELAY
DOMINANT TO RECESSIVE
MAX3054/MAX3055/MAX3056 toc17
TXD-TO-RXD PROPAGATION DELAY
DOMINANT TO RECESSIVE
MAX3054/MAX3055/MAX3056 toc18
MAX3054/MAX3055/MAX3056 toc19
TXD
5V/div
TXD
5V/div
TXD
MAX3056
MAX3054
MAX3055
MAX3055
MAX3056
MAX3054
MAX3056
MAX3055
MAX3054
1µs/div
1µs/div
TXD-TO-RXD PROPAGATION DELAY
RECESSIVE TO DOMINANT
1µs/div
MAX3056 CAN BUS AT 40kbps
MAX3054/MAX3055/MAX3056 toc21
MAX3054/MAX3055/MAX3056 toc20
TXD
CANH - CANL
5V/div
MAX3054
MAX3055
FFT
1V/div
MAX3056
1µs/div
4µs/div
MAX3055 CAN BUS AT 125kbps
MAX3054 CAN BUS AT 250kbps
MAX3054/MAX3055/MAX3056 toc22
2µs/div
www.analog.com
MAX3054/MAX3055/MAX3056 toc23
CANH - CANL
5V/div
CANH - CANL
10V/div
FFT
1V/div
FFT
1V/div
400ns/div
Analog Devices │ 10
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Pin Description
PIN
NAME
1
INH
Inhibit Output. Inhibit output is for switching an external voltage regulator if a wake-up signal occurs.
FUNCTION
2
TXD
Transmit Data Input
3
RXD
Receive Data Output
4
ERR
Error. Wake-up and power-on indication output; active low in normal operating mode when the bus has a
failure and in low-power modes (wake-up signal or in power-on standby).
5
STB
Standby. The digital control signal input (active low); defines together with input signal on pin EN, the state
of the transceiver (in normal and low-power modes).
6
EN
Enable. The digital control signal input; defines together with input signal on pin STB the state of the
transceiver (in normal and low-power modes).
7
WAKE
8
RTH
Termination Resistor. Termination resistor connection for CANH bus.
9
RTL
Termination Resistor. Termination resistor connection for CANL bus.
10
VCC
Supply Voltage. Bypass to ground with a 0.1µF capacitor.
11
CANH
HIGH-Level Voltage Bus line
12
CANL
LOW-Level Voltage Bus line
13
GND
Ground
14
BATT
Battery Supply. Bypass to ground with a 0.1µF capacitor.
Wake-Up. Local wake-up signal input; falling and rising edges are both detected.
Detailed Description
The MAX3054/MAX3055/MAX3056 interface between
the protocol controller and the physical wires of the bus
lines in a CAN. The devices provide differential transmit
capability and switch to single-wire mode if certain fault
conditions occur (see the Failure Management section).
The MAX3054/MAX3055/MAX3056 guarantee full wakeup capability during failure modes.
The extended fault-protection range of CANH and CANL
bus lines (±80V). A current-limiting circuit protects the
transmitter output stage against overcurrent faults. This
feature prevents destruction of the transmitter output
stage. If the junction temperature exceeds a value of
approximately +165°C, the transmitter output stages are
disabled. The CANH and CANL lines are also protected
against electrical transients, which can occur in harsh
environments.
The transceiver provides three low-power modes that
can be entered and exited through pins STB and EN. An
output INH pin can be used for deactivation of an external
voltage regulator.
MAX3055 is used for data rates of 125kbps and the
MAX3056 is designed for 40kbps applications. For the
40kbps and 125kbps versions, the built-in slope-control
feature allows the use of unshielded cables and receiver
input filters guarantee high noise immunity.
Normal Operation Mode
Transmitter
The transmitter converts a single-ended input (TXD) from
the CAN controller to differential outputs for the bus lines
(CANH, CANL).
Receiver
The receiver takes differential input from the bus lines
(CANH, CANL) and converts this data as a single-ended
output (RXD) to the CAN controller. It consists of a comparator that senses the difference ΔV = (CANH - CANL)
with respect to an internal threshold.
BATT
The main function of BATT is to supply power to the
device when a +12V battery voltage is supplied.
The MAX3054/MAX3055/MAX3056 are designed to provide optimal operation for a specified data rate. The
MAX3054 is ideal for high data rates of 250kbps. The
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Analog Devices │ 11
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
BATT
INH 1
STB 5
VCC
9
RTL
THERMAL
SHUTDOWN
WAKE-UP
STANDBY
CONTROLLER
WAKE 7
10
EN 6
TXD 2
DRIVER
FAULT DETECTION
CANH
12
CANL
8
RTH
FILTER
IPD
ERR 4
FILTER
4ms
11
GND
RXD 3
RECEIVER
MAX305_
Figure 5. Block Diagram
INH
ERR
Inhibit is an output that allows for the control of an external voltage regulator. On a wake-up request or power-up
on BATT, the transceiver sets the output INH high. This
feature enables the external voltage regulator to be shut
down during sleep mode to reduce power consumption.
ERR is a wake-up and power-on indicator as well as an
error detector. Upon power-up, wake up, or when a bus
failure is detected, the output signal on ERR becomes
LOW. Upon error recovery, the output signal on ERR is
set HIGH.
INH is floating while entering the sleep mode and stays
floating during the sleep mode. If INH is left floating, it
is not set to a high level again until the following events
occur:
STB
●
Power-on (VBATT switching on at cold start)
STB is the standby digital control signal into the logic
controller. This is an active-low input that is used with EN
to define the status of the transceiver in normal and lowpower modes.
●
Rising or falling edge on WAKE
●
Dominant signal longer than 38μs during EN or STB
at low level
EN
The signals on STB and EN are internally set to low level
when VCC is below a certain threshold voltage providing
fail-safe functionality.
After power-on (VBATT switched on) the signal on INH
becomes HIGH and an internal power-on flag is set. This
flag can be read in the power-on standby mode through
ERR (STB = 1, EN = 0) and is reset by entering the normal operating mode.
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EN is the enable digital control signal into the logic controller used in conjunction with STB to define the status of
the transceiver in normal and low-power modes.
WAKE
WAKE is an input to the logic controller within the device
to signal a wake-up condition. If WAKE receives a positive
or negative pulse for a period longer than tWAKE, wake
up occurs.
Analog Devices │ 12
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Failure Management
Driver Output Protection
Thermal Shutdown
If the junction temperature exceeds +165°C the driver is
switched off. Thermal hysteresis is 15°C, disabling thermal shutdown once the temperature reaches +150°C.
Overcurrent Protection
A current-limiting circuit protects the transmitter output
stage against a short circuit to a positive and negative
battery voltage. Although the power dissipation increases
during this fault condition, this feature prevents destruction of the transmitter output stage.
The failure detector is fully active in normal operating
mode. After the detection of a single failure the detector
switches to the appropriate state (see Table 1).
The differential receiver threshold voltage is set to -3.2V
typically (VCC = 5V). This ensures correct reception with a
noise margin as high as possible in the normal operating
mode and in the event of failure 1, 2, 5, 9.
If any of the wiring failures occur, the output signal on pin
ERR becomes LOW after detection. On error recovery,
the output signal on pin ERR becomes HIGH.
Table 1. Failure States
FAILURE
DESCRIPTION
MODE
1
CANH wire interrupted
Normal
2
CANL wire interrupted
Normal
3
CANH short circuited to battery
4
CANL short circuited to ground
All
5
CANH short circuited to ground
Normal
6
CANL short circuited to battery
Normal
7
CANL mutually short circuited to CANH
8
CANH short circuited to Vcc
All
9
CANL short circuited to Vcc
Normal
All
All
Failure 1—CANH Wire Interrupted (Normal Mode Only)
MODE
DESCRIPTION
Detection
The external termination resistance connected to the RTH pin provides an instantaneous pulldown of the open
CANH line to GND. Detection is provided, sensing the pulse-count difference between CANH and CANL (pulse
count = 4).
Receiver
The receiver remains in differential mode. No received data lost.
Driver
Driver remains in differential mode. No transmission data lost.
Recovery
Recovery is provided sensing the pulse-count difference between CANH and CANL after the detection of four
consecutive pulses.
Failure 2—CANL Wire Interrupted (Normal Mode Only)
MODE
DESCRIPTION
Detection
The external termination resistance connected to the RTL pin provides an instantaneous pullup of the CANL line to
VCC. Detection is provided, sensing the pulse-count difference between CANL and CANH (pulse count = 4).
Receiver
The receiver remains in differential mode. No received data lost.
Driver
Driver remains in differential mode. No transmission data lost.
Recovery
Recovery is provided, sensing the pulse-count difference between CANL and CANH after the detection of four
consecutive pulses.
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Analog Devices │ 13
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Table 1. Failure States (continued)
Failure 3—CANH Short-Circuited to Battery
MODE
DESCRIPTION
Detection
Sensing a permanent dominant condition on CANH for a timeout period.
Receiver
Receiver switches to single ended on CANL.
Driver
CANH and RTH are both switched off (high impedance) and transmission continues on CANL after timeout.
Recovery
When the short is removed, the recessive bus voltage is restored. If the differential voltage remains below the
recessive threshold level for the timeout period, reception and transmission switch back to the differential mode.
Failure 4—CANL Short-Circuited to GND
MODE
DESCRIPTION
Detection
Sensing a permanent dominant condition for a timeout period.
Receiver
Receiver switches to single ended on CANH.
Driver
CANL and RTL are both switched off (high impedance) and transmission continues on CANH after timeout.
Recovery
When the short is removed, the recessive bus voltage is restored. If the differential voltage remains below the
recessive threshold level for the timeout period, reception and transmission switch back to the differential mode.
Failure 5—CANH Short-Circuited to Ground or Below Ground (Normal Mode Only)
MODE
DESCRIPTION
Detection
Detection is provided, sensing the pulse-count difference between CANH and CANL (pulse count = 4).
Receiver
Receiver remains in differential mode. No received data lost.
Driver
RTH remains on and CANH remains enabled.
Recovery
Recovery is provided, sensing the edge-count difference between CANH and CANL after the detection of four
consecutive pulses.
Failure 6—CANL Short-Circuited to Battery (Normal Mode Only)
MODE
DESCRIPTION
Detection
Detected by a comparator for CANL > 7.3V after a timeout period.
Receiver
Receiver switches to single ended on CANH after timeout.
Driver
RTL is switched off after timeout. CANH remains active.
Recovery
Sensing CANL < 7.3V after the timeout period.
Failure 7—CANL Mutually Short-Circuited to CANH
MODE
DESCRIPTION
Detection
Sensing a permanent dominant condition on the differential comparator (CANH - CANL > -3.2V) for the timeout
period.
Receiver
Receiver switches to CANH single-ended mode after timeout.
Driver
CANL and RTL are both switched off after timeout. Transmission remains ongoing on CANH.
Recovery
When the short is removed, the recessive bus voltage is restored (RTL on if CANH - CANL < -3.2V) but CANL still
remains disabled and ERR = 0. If the differential voltage remains below the recessive threshold level (CANH CANL < -3.2V) for the timeout period, reception and transmission switch back to the differential mode.
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Analog Devices │ 14
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Table 1. Failure States (continued)
Failure 8—CANH Short-Circuited to VCC
MODE
DESCRIPTION
Detection
Sensing a permanent dominant condition on CANH for a timeout period.
Receiver
Receiver switches to single ended on CANL. Data lost (permanent dominant) during timeout.
Driver
CANH and RTH are both switched off (high impedance) and transmission continues on CANL after timeout. Only a
weak pulldown current on pin RTH remains.
Recovery
When the short is removed (CANH < 1.7V) and after a timeout, CANL is forced recessive (CANL off) and CANH is
enabled (RTH on and CANH enabled). Signal can be transmitted or received in single ended on CANH and ERR
remains low. If the differential voltage remains below the recessive threshold level (CANH - CANL < -3.2V) for a
second timeout, reception and transmission switch back to the differential mode and ERR is released high.
Failure 9—CANL Short-Circuited to VCC (Normal Mode Only)
MODE
DESCRIPTION
Detection
Detection is provided, sensing the pulse-count difference between CANL and CANH (pulse count = 4).
Receiver
Receiver remains in differential mode. No received data lost.
Driver
Driver remains in differential mode. No transmission data lost.
Recovery
Recovery is provided, sensing the pulse-count difference between CANL and CANH after the detection of four
consecutive pulses.
Table 2. Summary of the Driver Outputs and Internal Switches State During Fault
Conditions
DRIVER OUTPUTS STATE
FAILURE NO.
DESCRIPTION
MODE
INTERNAL SWITCHES STATE
CANH
CANL
No failure
—
Normal
RTH, RTL on
Enabled
Enabled
No failure
—
Low power
RTH, I_RTL on
Disabled
Disabled
1
CANH wire interrupted
Normal
RTH, RTL on
Enabled
Enabled
2
CANL wire interrupted
Normal
RTH, RTL on
Enabled
Enabled
3
CANH short to BATT
All
RTH off
Disabled
Enabled
4
CANL short to GND
All
RTL or I_RTL off
Enabled
Disabled
5
CANH short to GND
Normal
RTH, RTL on
Enabled
Enabled
6
CANL short to BATT
Normal
RTL off, RTH on
Enabled
Enabled
7
CANL short to CANH
All
RTL or I_RTL off
Enabled
Disabled
8
CANH short to VCC
All
RTH off
Disabled
Enabled
Normal
RTH, RTL on
Enabled
Enabled
9
CANL short to VCC
Note: The RTH-pulldown current switch and the RTL-pullup current switch are closed in normal mode with or without fault conditions,
open in sleep mode.
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Analog Devices │ 15
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Low-Power Modes
To prevent false wake-up due to transients or RF fields,
the wake-up voltage levels have to be maintained for more
than 38μs. In the low-power modes, the failure detection
circuit remains partly active to prevent increased power
consumption in the event of failures 3, 4, 7, and 8.
The transceiver provides three low-power modes that can
be entered or exited through pins STB and EN (Table 3).
Sleep Mode
The sleep mode is the mode with the lowest power consumption. INH is switched to high impedance for deactivation of the external voltage regulator. CANL is biased
to the battery voltage through RTL. If the supply voltage
is provided, RXD and ERR signal the wake-up interrupt.
Applications Information
The MAX3054/MAX3055/MAX3056 are capable of sustaining a network of up to 32 transceivers on a single bus.
The fault-tolerant transceivers are designed to operate at
a total termination resistance of 100Ω. Both CANH and
CANL lines are terminated with 100Ω. Since the total termination resistance of the system is distributed over the
entire bus, each of the transceivers contributes only part
of the total 100Ω termination. The values of the termination resistors RTL and RTH vary according to the size of
the system and need to be calculated. It is not required
that each transceiver be terminated with the same value,
the total termination need only be a total 100Ω.
Standby Mode
The standby mode reacts the same as the sleep mode
but with a HIGH level on INH. Standby mode can be used
when the external voltage regulator needs to be kept
active during low-power operation.
Power-On Standby Mode
The power-on standby mode behaves similarly to the
standby mode with the battery power-on flag of the wakeup interrupt signal on ERR. This mode is only for reading
the power-on flag. INH can be high or low in the poweron standby mode. When the device goes from standby
mode to power-on standby mode, INH is HIGH. When the
device goes from sleep mode to power-on standby mode,
INH is low.
The minimum termination resistor value allowed for each
transceiver is 500Ω, due to the driving capability of RTH
and RTL. This makes it impossible to achieve a total
termination resistance of 100Ω for systems smaller than
five transceivers. Typically this does not create a problem because smaller systems usually have shorter bus
cables and have no problem with higher total termination
resistance.
Wake-Up
Wake-up requests are recognized by the transceiver when
a dominant signal is detected on either bus line or if WAKE
detects a pulse for more than 38μs. On a wake-up request,
INH is set high to activate an external voltage regulator.
To reduce EMI in the case of an interrupted bus wire it is
recommended not to exceed 6kΩ termination resistance
at a single transceiver even though a higher value is
specified.
If VCC is provided, the wake-up request can be read on
the ERR or RXD outputs.
Table 3. Low-Power Modes
ERR
MODE
STB
EN
Go-to-Sleep
Command
0
1
Sleep
0
Standby
0
Power-On
Standby
1
0
VBATT power-on
flag
Normal
Operating
1
1
Error flag
LOW
Wake-up
interrupt signal
0 (Note 1)
(Notes 2 and 3)
0
RXD
HIGH
LOW
HIGH
RTL SWITCHED
TO
—
Wake-up
interrupt signal
(Notes 2 and 3)
—
VBATT
—
Wake-up
interrupt signal
(Notes 2 and 3)
—
VBATT
No error flag
Dominant
received data
Recessive
received data
VCC
Note 3: In case the go-to-sleep command was used before.
Note 4: If the supply voltage VCC is present.
Note 5: Wake-up interrupts are released when entering the normal operating mode.
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Analog Devices │ 16
MAX3054/MAX3055/
MAX3056
Reduced EMI and Reflections
±80V Fault-Protected/Tolerant CAN Transceiver
Due to internal slope control for the MAX3055/MAX3056,
the CANH and CANL outputs are slew-rate limited. This
minimizes EMI and reduces reflections caused by improperly terminated cables. In general, a transmitter’s rise
time relates directly to the length of an unterminated stub,
which can be driven with only minor waveform reflections. The following equation expresses this relationship
conservatively:
Length = tRISE/(15ns/ft)
where tRISE is the transmitter’s rise time.
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The MAX3054/MAX3055/MAX3056 require no special
layout considerations beyond common practices. Bypass
VCC to GND with a 0.1μF ceramic capacitor mounted
close to the IC with short lead lengths and wide trace
widths.
Chip Information
TRANSISTOR COUNT: 1300
PROCESS: BiCMOS
Analog Devices │ 17
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Package Information
8 SO
PACKAGE CODE
S8+5
Outline Number
21-0041
Land Pattern Number
90-0096
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.
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Analog Devices │ 18
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Revision History
REVISION
NUMBER
REVISION
DATE
0
11/02
Initial Release.
—
1
9/14
Removed Automotive designation.
1
2
2/21
Revised Package Information and added Revision History.
DESCRIPTION
PAGES
CHANGED
18, 19
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may result from its use. Specifications subject to change without notice. No license is granted by implication
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the property of their respective owners.
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