MAX3057ASA データシートの表示（PDF） - Maxim Integrated

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MAX3057ASA

±80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers

Maxim Integrated 

MAX3050/MAX3057

±80V Fault-Protected, 2Mbps, Low-Supply

Current CAN Transceivers

Detailed Description

The MAX3050 and MAX3057 interface between the

protocol controller and the physical wires of the bus lines

in a CAN. They are primarily intended for applications

requiring data rates up to 2Mbps and feature ±80V fault

protection against shorts in high-voltage systems. This

fault protection allows the devices to withstand up to ±80V

with respect to ground with no damage to the device.

The built-in fault tolerance allows the device to survive

in industrial environments with no external protection

devices. The devices provide differential transmit capabil-

ity to the bus and differential receive capability to the CAN

controller. (See Figure 4.)

The device has four modes of operation: high speed, slope

control, standby, and shutdown. In high-speed mode, slew

rates are not limited, making 2Mbps transmission speeds

possible. Slew rates are controlled in slopecontrol mode,

minimizing EMI and allowing use of unshielded twisted or

parallel cable. In standby mode, receivers are active and

transmitters are in high impedance. In shutdown mode,

transmitters and receivers are turned off.

The transceivers are designed to operate from a single

+5V supply and draw 56mA of supply current in dominant

state and 3.6mA in recessive state. In standby mode,

supply current is reduced to 135μA. In shutdown mode,

supply current is 15μA.

CANH and CANL are output short-circuit current-limited

and are protected against excessive power dissipation by

thermal-shutdown circuitry that places the driver outputs

into a high-impedance state.

Fault Protection

The MAX3050 and MAX3057 feature ±80V fault protec-

tion. This extended voltage range of CANH and CANL

bus lines allows use in high-voltage systems and com

munication with high-voltage buses. If data is transmitting

at 2Mbps, the fault protection is reduced to ±70V.

Transmitter

The transmitter converts a single-ended input (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.

VCC

THERMAL

SHUTDOWN

MAX3050

MAX3057

TXD

TRANSMITTER

CONTROL

CANH

CANL

RS

MODE

SELECTION

RXD

RECEIVER

0.75V

7.5V

WAKE

Figure 4. Functional Diagram

GND

AUTO

SHUTDOWN

SHDN

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