MAX3053ASA+ Maxim Integrated, MAX3053ASA+ Datasheet - Page 8

• Manufacturer Part Number: MAX3053ASA+
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of MAX3053ASA+

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 2 Mbps
• Supply Current (max): 72 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 5 V
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V

The MAX3053 interfaces between the protocol con-
troller and the physical wires of a CAN bus. It is primari-
ly intended for industrial applications requiring data
rates up to 2Mbps and features ±80V fault protection
against shorts in high-voltage systems. This fault pro-
tection allows the device 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 and automotive environments with no external
protection devices. The device provides differential
transmit capability to the bus and differential receive
capability to the CAN controller (Figure 4).
The device has three modes of operations: high-speed,
slope control, and shutdown. In high-speed mode, slew
rates are not limited, making 2Mbps transmission
speeds possible. Slew rates are controlled in slope
control mode, minimizing EMI and allowing use of
unshielded twisted or parallel cable. The device goes
into low-power operation in shutdown mode.
The transceiver is designed to operate from a single
+5V supply, and draws 56mA of supply current in dom-
inant state and 3.6mA in recessive state. In shutdown
mode, supply current is reduced to 15µA.
±80V Fault-Protected, 2Mbps,
Low Supply Current CAN Transceiver
Figure 4. Block Diagram
8
_______________________________________________________________________________________
TXD
RXD
RS
Detailed Description
SELECTION
MODE
RECEIVER
TRANSMITTER
SHUTDOWN
THERMAL
CONTROL
0.75V
7.5V
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.
The MAX3053 features ±80V fault protection. This
extended voltage range of CANH and CANL bus lines
allows its use in high-voltage systems and communicat-
ing to high-voltage buses. If data is transmitting at
2Mbps, the fault protection is reduced to ±70V.
The transmitter converts a single-ended input (TXD)
from the CAN controller to differential outputs for the
bus lines (CANH, CANL). Table 1 is the truth table for
the transmitter and receiver.
Connect RS to ground to set the MAX3053 to high-
speed mode. When operating in high-speed mode, the
MAX3053 can achieve transmission rates up to 2Mbps.
Line drivers are switched on and off as quickly as pos-
sible. However, in this mode, no measures are taken to
limit the rise and fall slope of the data signal, allowing
for potential EMI emissions. If using the MAX3053 in
high-speed mode, use shielded twisted-pair cable to
avoid EMI problems.
MAX3053
WAKE
AUTOSHUTDOWN
V
CC
SHDN
CANH
CANL
GND
Fault Protection
Transmitter
High Speed