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| 型号： | MCP2551-I/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC TRANSCEIVER CAN HI-SPD 8-SOIC |
| 产品培训模块： | CAN Bus Protection |
| 标准包装： | 100 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | CAN |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 产品目录页面： | 685 (CN2011-ZH PDF) |
| 配用： | AC164130-2-ND - DAUGHTER BOARD CAN/LIN PICTAIL MCP2515DM-BM-ND - BOARD DEMO FOR MCP2515/51 MCP2515DM-PTPLS-ND - BOARD DAUGHTER PICTAIL MCP2515 AC164130-ND - BOARD DAUGHT PICTL PLUS ECAN/LIN |
2010 Microchip Technology Inc.
DS21667F-page 3
MCP2551
1.0
DEVICE OVERVIEW
The MCP2551 is a high-speed CAN, fault-tolerant
device that serves as the interface between a CAN
protocol controller and the physical bus. The MCP2551
device provides differential transmit and receive
capability for the CAN protocol controller, and is fully
compatible with the ISO-11898 standard, including 24V
requirements. It will operate at speeds of up to 1 Mb/s.
Typically, each node in a CAN system must have a
device to convert the digital signals generated by a
CAN controller to signals suitable for transmission over
the bus cabling (differential output). It also provides a
buffer between the CAN controller and the high-voltage
spikes that can be generated on the CAN bus by
outside sources (EMI, ESD, electrical transients, etc.).
1.1
Transmitter Function
The
CAN
bus
has
two
states: Dominant
and
Recessive. A Dominant state occurs when the
differential voltage between CANH and CANL is
greater than a defined voltage (e.g.,1.2V). A Recessive
state occurs when the differential voltage is less than a
defined voltage (typically 0V). The Dominant and
Recessive states correspond to the Low and High state
of the TXD input pin, respectively. However, a
Dominant state initiated by another CAN node will
override a Recessive state on the CAN bus.
1.1.1
MAXIMUM NUMBER OF NODES
The MCP2551 CAN outputs will drive a minimum load
of 45
Ω, allowing a maximum of 112 nodes to be
connected
(given
a
minimum
differential
input
resistance of 20 k
Ω and a nominal termination resistor
value of 120
Ω).
1.2
Receiver Function
The RXD output pin reflects the differential bus voltage
between CANH and CANL. The Low and High states of
the RXD output pin correspond to the Dominant and
Recessive states of the CAN bus, respectively.
1.3
Internal Protection
CANH and CANL are protected against battery short-
circuits and electrical transients that can occur on the
CAN bus. This feature prevents destruction of the
transmitter output stage during such a fault condition.
The device is further protected from excessive current
loading by thermal shutdown circuitry that disables the
output drivers when the junction temperature exceeds
a nominal limit of 165°C. All other parts of the chip
remain operational, and the chip temperature is low-
ered due to the decreased power dissipation in the
transmitter outputs. This protection is essential to
protect against bus line short-circuit-induced damage.
1.4
Operating Modes
The RS pin allows three modes of operation to be
selected:
High-Speed
Slope-Control
Standby
These modes are summarized in Table 1-1.
When in High-Speed or Slope-Control mode, the
drivers for the CANH and CANL signals are internally
regulated to provide controlled symmetry in order to
minimize EMI emissions.
Additionally, the slope of the signal transitions on
CANH and CANL can be controlled with a resistor
connected from pin 8 (RS) to ground. The slope must
be proportional to the current output at RS, which will
further reduce EMI emissions.
1.4.1
HIGH-SPEED
High-Speed mode is selected by connecting the RS pin
to VSS. In this mode, the transmitter output drivers have
fast output rise and fall times to support high-speed
CAN bus rates.
1.4.2
SLOPE-CONTROL
Slope-Control mode further reduces EMI by limiting the
rise and fall times of CANH and CANL. The slope, or
slew rate (SR), is controlled by connecting an external
resistor (REXT) between RS and VOL (usually ground).
The slope is proportional to the current output at the RS
pin. Since the current is primarily determined by the
slope-control resistance value REXT, a certain slew rate
is
achieved
by
applying
a
specific
resistance.
Figure 1-1 illustrates typical slew rate values as a
function of the slope-control resistance value.
1.4.3
STANDBY MODE
The device may be placed in Standby or SLEEP mode
by applying a high-level to the RS pin. In SLEEP mode,
the transmitter is switched off and the receiver operates
at a lower current. The receive pin on the controller side
(RXD) is still functional, but will operate at a slower
rate. The attached microcontroller can monitor RXD for
CAN bus activity and place the transceiver into normal
operation via the RS pin (at higher bus rates, the first
CAN message may be lost).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP2551T-E/SN | 功能描述:网络控制器与处理器 IC Hi Spd CAN Transceiv RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCP2551T-E/SN-CUT TAPE | 制造商:Microchip 功能描述:MCP2551 Series 5.5 V 1 Mb/s Surface Mount High-Speed CAN Transceiver - SOIC-8 |
| MCP2551T-I/SN | 功能描述:网络控制器与处理器 IC Hi Spd CAN Transceiv RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCP2551T-I/SN-CUT TAPE | 制造商:Microchip 功能描述:MCP2551 Series 5.5 V 1 Mb/s Surface Mount High-Speed CAN Transceiver - SOIC-8 |
| MCP2551T-I/SNG | 制造商:Microchip Technology Inc 功能描述:CAN 1MBPS SLEEP/STANDBY 5V IND 8SOIC N - Tape and Reel |
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