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82C250のメーカーはPhilipsです、この部品の機能は「CAN controller interface」です。 |
部品番号 | 82C250 |
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部品説明 | CAN controller interface | ||
メーカ | Philips | ||
ロゴ | |||
このページの下部にプレビューと82C250ダウンロード(pdfファイル)リンクがあります。 Total 12 pages
www.DataSPhheielitp4sUS.ceommiconductors
CAN controller interface
Objective specification
PCA82C250
FEATURES
• Fully compatible with the “ISO/DIS 11898” standard
• High speed (up to 1 Mbaud)
• Bus lines protected against transients in an automotive
environment
• Slope control to reduce radio frequency interference
(RFI)
• Differential receiver with wide common-mode range for
high immunity against electromagnetic interference
(EMI)
• Thermally protected
• Short-circuit proof to battery and ground
• Low current standby mode
• An unpowered node does not disturb the bus lines
• At least 110 nodes can be connected.
APPLICATIONS
• High-speed applications (up to 1 Mbaud) in cars.
GENERAL DESCRIPTION
The PCA82C250 is the interface between the CAN
protocol controller and the physical bus. The device
provides differential transmit capability to the bus and
differential receive capability to the CAN controller.
QUICK REFERENCE DATA
SYMBOL
VCC
ICC
1/tbit
VCAN
∆V
tpd
Tamb
PARAMETER
supply voltage
supply current
maximum transmission speed
CANH, CANL input/output voltage
differential bus voltage
propagation delay
operating ambient temperature
CONDITIONS
non-return-to-zero
high-speed mode
MIN.
4.5
−
1
−8
1.5
−
−40
MAX.
5.5
170
−
+18
3.0
50
+125
UNIT
V
µA
Mbaud
V
V
ns
°C
ORDERING INFORMATION
TYPE NUMBER
PCA82C250
PCA82C250T
PINS
8
8
PACKAGE
PIN POSITION
MATERIAL
DIP8
SO8
plastic
plastic
CODE
SOT97-1
SOT96-1
September 1994
7-69
1 Page www.DataSPhheileipt4sUS.ecommiconductors
CAN controller interface
Objective specification
PCA82C250
FUNCTIONAL DESCRIPTION
The PCA82C250 is the interface between the CAN
protocol controller and the physical bus. It is primarily
intended for high-speed applications (up to 1 Mbaud) in
cars. The device provides differential transmit capability to
the bus and differential receive capability to the CAN
controller. It is fully compatible with the “ISO/DIS 11898”
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
in operation. 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.
For lower speeds or shorter bus length, an unshielded
twisted pair or a parallel pair of wires can be used for the
bus. 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 slow in standby mode, the first
message will be lost.
Table 1 Truth table of CAN transceiver.
SUPPLY
4.5 to 5.5 V
4.5 to 5.5 V
<2 V (not powered)
2 V < VCC < 4.5 V
2 V < VCC < 4.5 V
TxD
0
1 (or floating)
X
>0.75VCC
X
CANH
HIGH
floating
floating
floating
floating if
VRs > 0.75VCC
CANL
LOW
floating
floating
floating
floating if
VRs > 0.75VCC
BUS STATE
dominant
recessive
recessive
recessive
recessive
RxD
0
1
X
X
X
Table 2 Rs (pin 8) summary.
CONDITION FORCED AT Rs
VRs > 0.75VCC
−10 µA < IRs < −200 µA
VRs < 0.3VCC
MODE
standby
slope control
high-speed
RESULTING VOLTAGE OR
CURRENT AT Rs
IRs < |10 µA|
0.4VCC < VRs < 0.6VCC
IRs < −500 µA
September 1994
7-71
3Pages www.DataSPhheileipt4sUS.ecommiconductors
CAN controller interface
Objective specification
PCA82C250
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP.
Rdiff differential input resistance
Ci CANH, CANL input capacitance
Cdiff differential input capacitance
20 −
−−
−−
Reference output
Vref
reference output voltage
V8 = 1 V;
0.45VCC −
−50 µA < I5 < 50 µA
V8 = 4 V;
−5 µA < I5 < 5 µA
0.4VCC −
Timing (see Figs 4, 6 and 7)
tbit
tonTxD
toffTxD
tonRxD
toffRxD
tonRxD
toffRxD
|SR|
minimum bit time
delay TxD to bus active
delay TxD to bus inactive
delay TxD to receiver active
delay TxD to receiver inactive
delay TxD to receiver active
delay TxD to receiver inactive
differential output voltage slew
rate
V8 = 1 V
V8 = 1 V
V8 = 1 V
V8 = 1 V
V8 = 1 V; VCC < 5.1 V;
Tamb < +85 °C
V8 = 1 V; VCC < 5.1 V;
Tamb < +125 °C
V8 = 1 V; VCC < 5.5 V;
Tamb < +85 °C
V8 = 1 V; VCC < 5.5 V;
Tamb < +125 °C
R8 = 47 kΩ
R8 = 24 kΩ
R8 = 47 kΩ
R8 = 24 kΩ
R8 = 47 kΩ
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
40
55
82
82
90
90
390
260
260
210
14
tWAKE
wake-up time from standby
(via pin 8)
−−
tdRxDL
bus dominant to RxD LOW
V8 = 4 V; standby mode −
−
Standby/slope control (pin 8)
V8
I8
Vstb
Islope
Vslope
input voltage for high-speed
input current for high-speed
input voltage for standby mode
slope control mode current
slope control mode voltage
V8 = 0 V
−−
−−
0.75VCC −
−10 −
0.4VCC −
Note
1. I1 = I4 = I5 = 0 mA; 0 V < V6 < VCC; 0 V < V7 < VCC; V8 = VCC.
MAX.
100
20
10
UNIT
kΩ
pF
pF
0.55VCC V
0.6VCC V
1 µs
50 ns
80 ns
120 ns
150 ns
170 ns
170 ns
190 ns
520 ns
320 ns
450 ns
320 ns
− V/µs
20 µs
3 µs
0.3VCC
−500
−
−200
0.6VCC
V
µA
V
µA
V
September 1994
7-74
6 Page | |||
ページ | 合計 : 12 ページ | ||
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