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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 thermalpro-

tection circuits protect the transmitter output stage against

overcurrent faults to prevent destruction of the transmitter

output stage. The CANH and CANL lines are also protect-

ed 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

19-2687; Rev 1; 9/14

+Lead-free/RoHS-compliant package

PART TEMP RANGE DATA RATE

PIN-

PACKAGE

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

TXD RXD STB EN

ERR

INH

BATTERY

RTH

CANH CANL

RTL

BATT

GND

WAKE

+5V

CAN CONTROLLER

2 3 5 6 4 1

8 11 12 9

100nF

BATT

+12V

CAN BUS

FAULT

TO 80V

MAX305_

BATT

GND

CANL

CANHERR

RXD

TXD

INH

TOP VIEW

RTL

RTHWAKE

STB

MAX3054

MAX3055

MAX3056

MAX3054/MAX3055/

MAX3056

±80V Fault-Protected/Tolerant CAN Transceiver

Typical Operating Circuit

Pin Conguration

Ordering Information

Summary of content (18 pages)

PAGE 1
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.
PAGE 2
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............................................................
PAGE 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 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.
PAGE 4
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.
PAGE 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, 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.
PAGE 6
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, TA = +25°C.
PAGE 7
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 VCC 6 5 EN STB RTH WAKE CANL TXD 8 R1 CL R1 CL 12 MAX305_ -3.2V -5V VDIFF VRXD VCC/2 tPDL tPDH 1 VBATT CBYPASS 14 CANH INH RTL BATT ERR 4 GND 11 9 RXD 13 3 VDIFF = CANH - CANL CX = 15pF PROBE CAP INCLUDED Figure 1. Timing Diagram for Dynamic Characteristic Figure 2.
PAGE 8
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.) 5 -7 26 59 92 33 32 50 100 150 200 250 300 350 400 450 500 0 0 25 50 75 100 MAX3055 RECEIVER PROPAGATION DELAY vs.
PAGE 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.) 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 1.8 TA = +25°C 1.
PAGE 10
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.
PAGE 11
MAX3054/MAX3055/ MAX3056 ±80V Fault-Protected/Tolerant CAN Transceiver Pin Description PIN NAME FUNCTION 1 INH Inhibit Output. Inhibit output is for switching an external voltage regulator if a wake-up signal occurs. 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 power-on standby). 5 STB Standby.
PAGE 12
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.
PAGE 13
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.
PAGE 14
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.
PAGE 15
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.
PAGE 16
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).
PAGE 17
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.
PAGE 18
MAX3054/MAX3055/ MAX3056 ±80V Fault-Protected/Tolerant CAN Transceiver Package Information 14L SOIC.EPS 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.