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PCA82C251 Datasheet Preview

PCA82C251 Datasheet

CAN transceiver

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PCA82C251
CAN transceiver for 24 V systems.
GENERAL DESCRIPTION
The PCA82C251 is the interface between the CAN protocol controller and the physical bus.
It is primarily intended for applications (up to 1 Mbaud) in trucks and buses.
The device provides differential transmit capability to the bus and differential receive capability to
the CAN controller.
FEATURES
Fully compatible with the “ISO 11898-24 V” standard
Slope control to reduce RFI
Thermally protected
Short-circuit proof to battery and ground in 24 V powered systems
Low-current standby mode
An unpowered node does not disturb the bus lines
At least 110 nodes can be connected
High speed (up to 1 Mb)
High immunity against electromagnetic interference
QUICK REFERENCE DATA
SYMBOL
PARAMETER
VCC
ICC
1/tbit
VCAN
Vdiff
Tamb
Supply Voltage
Supply Current
Maximum Transmission Speed
CANH, CANL In/Out Voltage
Differential Bus Voltage
Ambient Temperature
ORDERING INFORMATION
CONDITIONS
Standby Mode
Non Return To Zero
MIN
4.5
-
1
-36
1.5
-40
MAX
5.5
275
-
+36
3
+125
UNIT
V
µA
Mb
V
V
°C
TYPE NUMBER
PCA52C251
PCA52C251T
DESCRIPTION
plastic dual in-line package; 8 leads (300 mil)
plastic small outline package; 8 leads body width 3.9 mm
PACKAGE
DIP8
SO8
26/01/2014
COMSET SEMICONDUCTORS
1/8




COMSET

PCA82C251 Datasheet Preview

PCA82C251 Datasheet

CAN transceiver

No Preview Available !

PCA82C251
PINNING
PIN SYMBOL
DESCRIPTION
1
TXD
Transmit Data Input
2 GND Ground
3 VCC Supply Voltage
4 RXD Receive Data Output
5 Vref Reference Voltage Output
6 CANL Low-Level CAN Voltage In/Out
7 CANH High-Level CAN Voltage In/Out
8 RS Slope Resistor Input
FUNCTIONAL DESCRIPTION
The PCA82C251 is the interface between the CAN protocol controller and the physical bus.
It is primarily intended for applications up to 1 Mb in trucks and buses.
The device provides differential transmit capability to the bus and differential receive capability to the CAN
controller.
It is fully compatible with the “ISO 11898-24 V” standard.
A current limiting circuit protects the transmitter output stage against short-circuit to positive and negative
battery voltage.
Although the power dissipation is increased during this fault condition, this feature will prevent destruction of
the transmitter output stage.
If the junction temperature exceeds a value of approximately 160 C, the limiting current of both transmitter
outputs is decreased.
Because the transmitter is responsible for the major part of the power dissipation, this will result in a reduced
power dissipation and hence a lower chip temperature.
All other parts of the IC will remain operating.
The thermal protection is particularly needed when a bus line is short-circuited.
The CANH and CANL lines are also protected against electrical transients which may occur in an automotive
environment.
Pin 8 (Rs) allows three different modes of operation to be selected: high-speed, slope control or standby.
For high-speed operation, the transmitter output transistors are simply switched on and off as fast as
possible.
In this mode, no measures are taken to limit the rise and fall slope. Use of a shielded cable is
recommended to avoid RFI problems.
The high-speed mode is selected by connecting pin 8 to ground.
The slope control mode allows the use of an unshielded twisted pair or a parallel pair of wires as bus lines.
To reduce RFI, the rise and fall slope should be limited.
The rise and fall slope can be programmed with a resistor connected from pin 8 to ground. The slope is
proportional to the current output at pin 8.
If a HIGH level is applied to pin 8, the circuit enters a low current standby mode. In this mode, the transmitter
is switched off and the receiver is switched to a low current.
If dominant bits are detected (differential bus voltage >0.9 V), RXD will be switched to a LOW level.
The microcontroller should react to this condition by switching the transceiver back to normal operation (via
pin 8). Because the receiver is slower in standby mode, the first message will be lost at higher bit rates.
26/01/2014
COMSET SEMICONDUCTORS
2/8


Part Number PCA82C251
Description CAN transceiver
Maker COMSET
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PCA82C251 Datasheet PDF






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