MAX13051ASA+T Maxim Integrated Products, MAX13051ASA+T Datasheet - Page 10

IC TRANSCEIVER CAN 8-SOIC

MAX13051ASA+T

Manufacturer Part Number
MAX13051ASA+T
Description
IC TRANSCEIVER CAN 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet

Specifications of MAX13051ASA+T

Number Of Drivers/receivers
1/1
Protocol
CAN
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The CANH and CANL common-mode range is ±12V
exceeding the ISO 11898 specification at -2V to +7V.
RXD is logic-high when CANH and CANL are shorted
or undriven.
The MAX13051 current-limiting feature protects the
transmitter output stage against a short circuit to a posi-
tive and negative battery voltage. Although the power
dissipation increases during this fault condition, current-
limit protection prevents destruction of the transmitter
output stage. Upon removal of a short, the MAX13051
resumes normal operation.
If the junction temperature exceeds +165°C, the device
is switched off. The hysteresis is approximately 13°C,
disabling thermal shutdown once the temperature
drops below 152°C. In thermal shutdown, CANH and
CANL go recessive. After a thermal-shutdown event,
the MAX13051 resumes normal operation when the
±80V Fault-Protected Can Transceiver
with Autobaud
Figure 5. Transmitter-Dominant Timeout Timing Diagram
Figure 6. Multiple Receivers Connected to CAN Bus
10
V
______________________________________________________________________________________
CANH
RXD
TXD
- V
MAX13051
CANL
TXD
CANH
CANL
t
DOM
R
L
= 120Ω
Driver Output Protection
TRANSMITTER
ENABLED
TRANSMITTER
DISABLED
Thermal Shutdown
KEEP AS SHORT AS POSSIBLE
TRANSCEIVER 1
TWISTED PAIR
STUB LENGTH
junction temperature drops below the thermal-shut-
down hysteresis, and upon the MAX13051 detecting a
rising edge at TXD.
In slope-control mode, the CANH and CANL outputs
are slew-rate limited, minimizing high-frequency EMI,
and reducing reflections caused by improperly termi-
nated cables.
In multidrop CAN applications, it is important to main-
tain a direct point-to-point wiring scheme. A single pair
of wires should connect each element of the CAN bus,
and the two ends of the bus should be terminated with
120Ω resistors, see Figure 6. A star configuration
should never be used.
Any deviation from the point-to-point wiring scheme
creates a stub. The high-speed edge of the CAN data
on a stub can create reflections back down the bus.
These reflections 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 small as
possible, especially in high-speed mode. In slope-con-
trol mode, the requirements are not as rigorous, but
stub length should still be minimized.
CANH and CANL are differential signals and steps
should be taken to insure equivalent parasitic capaci-
tance. Place the resistor at RS as close as possible to
the MAX13051 to minimize any possible noise coupling
at the input.
TRANSCEIVER 2
Applications Information
Reduced EMI and Reflections
Layout Consideration
R
L
= 120Ω
TRANSCEIVER 3

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