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부품번호 PCA82C251T 기능
기능 CAN transceiver for 24 V systems
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PCA82C251T 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
PCA82C251
CAN transceiver for 24 V systems
Product specification
Supersedes data of 1997 Mar 14
File under Integrated Circuits, IC18
2000 Jan 13




PCA82C251T pdf, 반도체, 판매, 대치품
Philips Semiconductors
CAN transceiver for 24 V systems
Product specification
PCA82C251
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 Mbaud 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.
Table 1 Truth table of the CAN transceiver
VCC
4.5 to 5.5 V
4.5 to 5.5 V
4.5 < VCC < 5.5 V
TXD
0
1 (or floating)
X(1)
0 < VCC < 4.5 V
floating
CANH
HIGH
floating
floating if
VRs > 0.75VCC
floating
CANL
LOW
floating
floating if
VRs > 0.75VCC
floating
Notes
1. X = don’t care.
2. If another bus node is transmitting a dominant bit, then RXD is logic 0.
BUS STATE
dominant
recessive
floating
floating
RXD
0
1(2)
1(2)
X(1)
Table 2 Pin Rs summary
CONDITION FORCED AT PIN Rs
VRs > 0.75VCC
10 µA < IRs < 200 µA
VRs < 0.3VCC
MODE
standby
slope control
high-speed
RESULTING VOLTAGE OR CURRENT AT PIN Rs
IRs < 10 µA
0.4VCC < VRs < 0.6VCC
IRs < 500 µA
2000 Jan 13
4

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PCA82C251T 전자부품, 판매, 대치품
Philips Semiconductors
CAN transceiver for 24 V systems
Product specification
PCA82C251
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
VOH HIGH-level output voltage I4 = 100 µA
(pin 4)
0.8VCC
VOL LOW-level output voltage I4 = 1 mA
(pin 4)
I4 = 10 mA
Ri CANH, CANL input
resistance
0
0
5
Rdiff differential input resistance
20
Reference output
Vref reference output voltage V8 = 1 V; I5< 50 µA
V8 = 4 V; I5< 5 µA
0.45VCC
0.4VCC
Timing (RL = 60 ; CL = 100 pF; unless otherwise specified. See Figs 3 and 4)
tbit
tonTXD
toffTXD
tonRXD
minimum bit time
delay TXD to bus active
delay TXD to bus inactive
delay TXD to receiver
active
R8 = 0
R8 = 0
R8 = 0
R8 = 0
−−
−−
40
55
toffRXD
delay TXD to receiver
inactive
tonRXD
delay TXD to receiver
active
R8 = 0 ; Tamb < +85 °C;
VCC = 4.5 to 5.1 V
R8 = 0 ; VCC = 4.5 to 5.1 V
R8 = 0 ; Tamb < +85 °C
R8 = 0
R8 = 47 k
R8 = 47 k
80
80
90
90
290
440
SR
tWAKE
CANH, CANL slew rate R8 = 47 k
wake-up time from standby see Fig.6
(via pin 8)
7
−−
tdRXDL
bus dominant to RXD LOW V8 = 4 V; see Fig.7
−−
Standby/slope control (pin 8)
Vstb input voltage for standby
mode
0.75VCC
Islope
Vslope
slope control mode current
slope control mode voltage
10
0.4VCC
Notes
1. I1 = I4 = I5 = 0 mA; 0 V < V6 < VCC; 0 V < V7 < VCC; V8 = VCC; Tamb < 90 °C.
2. This is valid for the receiver in all modes: high-speed, slope control and standby.
MAX.
VCC
UNIT
V
0.2VCC
1.5
25
V
V
k
100 k
0.55VCC V
0.6VCC V
1 µs
50 ns
80 ns
120 ns
150 ns
170 ns
170 ns
190 ns
400 ns
550 ns
V/µs
20 µs
3 µs
V
200
0.6VCC
µA
V
2000 Jan 13
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PCA82C251

CAN transceiver for 24 V systems

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