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参数资料
| 型号： | 935288885112 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, INTERFACE CIRCUIT, PDSO8 |
| 封装： | 3.90 MM, PLASTIC, MS-012, SOT96-1, SOP-8 |
| 文件页数： | 19/24页 |
| 文件大小： | 214K |
| 代理商： | 935288885112 |
2000 Jan 13
4
Philips Semiconductors
Product specication
CAN transceiver for 24 V systems
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
Notes
1. X = don’t care.
2. If another bus node is transmitting a dominant bit, then RXD is logic 0.
Table 2
Pin Rs summary
VCC
TXD
CANH
CANL
BUS STATE
RXD
4.5 to 5.5 V
0
HIGH
LOW
dominant
0
4.5 to 5.5 V
1 (or oating)
oating
recessive
1(2)
4.5<VCC < 5.5 V
X(1)
oating if
VRs > 0.75VCC
oating if
VRs > 0.75VCC
oating
1(2)
0<VCC < 4.5 V
oating
X(1)
CONDITION FORCED AT PIN Rs
MODE
RESULTING VOLTAGE OR CURRENT AT PIN Rs
VRs > 0.75VCC
standby
IRs <10 A
10
A< IRs < 200 A
slope control
0.4VCC <VRs < 0.6VCC
VRs < 0.3VCC
high-speed
IRs < 500 A
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相关代理商/技术参数 |
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| MCZ33905BD3EKR2 | 功能描述:CAN 接口集成电路 3.3V SBC HSCAN DUAL LIN RoHS:否 制造商:Texas Instruments 类型:Transceivers 工作电源电压:5 V 电源电流: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33905BD3R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:SBC Gen2 with CAN High Speed and LIN Interface |
| MCZ33905BD5EK | 功能描述:CAN 接口集成电路 5.0V SBC HSCAN DUAL LIN RoHS:否 制造商:Texas Instruments 类型:Transceivers 工作电源电压:5 V 电源电流: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33905BD5EKR2 | 功能描述:CAN 接口集成电路 5.0V SBC HSCAN DUAL LIN RoHS:否 制造商:Texas Instruments 类型:Transceivers 工作电源电压:5 V 电源电流: 工作温度范围:- 40 C to + 85 C 封装 / 箱体:SOIC-8 封装:Tube |
| MCZ33905BD5R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:SBC Gen2 with CAN High Speed and LIN Interface |
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