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Table Of Contents

MCP2551

Features

• Supports 1 Mb/s operation

• Implements ISO-11898 standard physical layer

requirements

• Suitable for 12V and 24V systems

• Externally-controlled slope for reduced RFI

emissions

• Detection of ground fault (permanent dominant)

on TXD input

• Power-on reset and voltage brown-out protection

• An unpowered node or brown-out event will not

disturb the CAN bus

• Low current standby operation

• Protection against damage due to short-circuit

conditions (positive or negative battery voltage)

• Protection against high-voltage transients

• Automatic thermal shutdown protection

• Up to 112 nodes can be connected

• High noise immunity due to differential bus

implementation

• Temperature ranges:

- Industrial (I): -40°C to +85°C

- Extended (E): -40°C to +125°C

Package Types

Block Diagram

CANH

CANL

VREF

TXD

VSS

VDD

RXD

PDIP/SOIC

MCP2551

Thermal

Shutdown

VDD

VSS

CANH

CANL

TXD

RXD

REF

VDD

Slope

Control

Power-On

Reset

Reference

Voltage

Receiver

GND

0.5 V

TXD

Dominant

Detect

Driver

Control

High-Speed CAN Transceiver

Summary of content (24 pages)

PAGE 1
MCP2551 High-Speed CAN Transceiver Features Package Types • Supports 1 Mb/s operation • Implements ISO-11898 standard physical layer requirements • Suitable for 12V and 24V systems • Externally-controlled slope for reduced RFI emissions • Detection of ground fault (permanent dominant) on TXD input • Power-on reset and voltage brown-out protection • An unpowered node or brown-out event will not disturb the CAN bus • Low current standby operation • Protection against damage due to short-circuit conditions (
PAGE 3
MCP2551 1.0 DEVICE OVERVIEW 1.4 Operating Modes 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 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.
PAGE 4
MCP2551 TABLE 1-1: MODES OF OPERATION Mode Current at Rs Pin Standby Slope-control High-speed TABLE 1-2: Resulting Voltage at RS Pin -IRS < 10 µA 10 µA < -IRS < 200 µA -IRS < 610 µA VRS > 0.75 VDD 0.4 VDD < VRS < 0.6 VDD 0 < VRS < 0.3VDD TRANSCEIVER TRUTH TABLE VDD VRS TXD 4.5V ≤ VDD ≤ 5.5V VRS < 0.75 VDD 0 1 or floating X 0 1 or floating X X CANH Bus State( 1) CANL HIGH LOW Dominant Not Driven Not Driven Recessive Not Driven Not Driven Recessive VRS > 0.75 VDD VRS < 0.
PAGE 5
MCP2551 1.5 TXD Permanent Dominant Detection If the MCP2551 detects an extended low state on the TXD input, it will disable the CANH and CANL output drivers in order to prevent the corruption of data on the CAN bus. The drivers are disabled if TXD is low for more than 1.25 ms (minimum). This implies a maximum bit time of 62.5 µs (16 kb/s bus rate), allowing up to 20 consecutive transmitted dominant bits during a multiple bit error and error frame scenario.
PAGE 7
MCP2551 2.0 ELECTRICAL CHARACTERISTICS 2.1 Terms and Definitions A number of terms are defined in ISO-11898 that are used to describe the electrical characteristics of a CAN transceiver device. These terms and definitions are summarized in this section. 2.1.1 BUS VOLTAGE VCANL and VCANH denote the voltages of the bus line wires CANL and CANH relative to ground of each individual CAN node. 2.1.
PAGE 8
MCP2551 Absolute Maximum Ratings† VDD .............................................................................................................................................................................7.0V DC Voltage at TXD, RXD, VREF and VS ............................................................................................ -0.3V to VDD + 0.3V DC Voltage at CANH, CANL (Note 1) ..........................................................................................................
PAGE 9
MCP2551 2.2 DC Characteristics Electrical Characteristics: Industrial (I): TAMB = -40°C to +85°C VDD = 4.5V to 5.5V Extended (E):TAMB = -40°C to +125°C VDD = 4.5V to 5.5V DC Specifications Param No. Sym Characteristic Min Max Units Conditions Supply — 75 mA Dominant; VTXD = 0.
PAGE 10
MCP2551 2.2 DC Characteristics (Continued) Electrical Characteristics: Industrial (I): TAMB = -40°C to +85°C VDD = 4.5V to 5.5V Extended (E):TAMB = -40°C to +125°C VDD = 4.5V to 5.5V DC Specifications (Continued) Param No.
PAGE 11
MCP2551 FIGURE 2-2: TEST CIRCUIT FOR AUTOMOTIVE TRANSIENTS CANH TXD VREF CAN Transceiver 500 pF 60Ω Schaffner Generator RXD CANL 500 pF RS GND Note: Rext RS may be connected to VDD or GND via a load resistor depending on desired operating mode as described in Section 1.7.8, “Slope Resistor Input (Rs)” The wave forms of the applied transients shall be in accordance with “ISO-7637, Part 1”, test pulses 1, 2, 3a and 3b.
PAGE 12
MCP2551 2.3 AC Characteristics Electrical Characteristics: Industrial (I): TAMB = -40°C to +85°C VDD = 4.5V to 5.5V Extended (E): TAMB = -40°C to +125°C VDD = 4.5V to 5.5V AC Specifications Param No. Sym 1 tBIT 2 fBIT 3 TtxL2bus(d) 4 TtxH2bus(r) 5 6 TtxL2rx(d) TtxH2rx(r) Characteristic Min Max Units Bit time 1 62.
PAGE 13
MCP2551 2.4 Timing Diagrams and Specifications FIGURE 2-4: TIMING DIAGRAM FOR AC CHARACTERISTICS VDD TXD (transmit data input voltage) 0V VDIFF (CANH, CANL differential voltage) RXD (receive data output voltage) 0.5V 0.9V 0.7 VDD 0.3 VDD 3 4 5 6 FIGURE 2-5: TIMING DIAGRAM FOR WAKE-UP FROM STANDBY VRS Slope resistor input voltage VDD 0.6 VDD 0V VRXD Receive data output voltage 0.3 VDD 10 VTXD = 0.8V FIGURE 2-2: TIMING DIAGRAM FOR BUS DOMINANT TO RXD LOW (STANDBY MODE) 1.
PAGE 15
MCP2551 3.0 PACKAGING INFORMATION 3.1 Package Marking Information 8-Lead PDIP (300 mil) XXXXXXXX XXXXXNNN YYWW 8-Lead SOIC (150 mil) e3 * Note: MCP2551 I/P256 e3 0726 Example: MCP2551 e3 I/SN0726 256 XXXXXXXX XXXXYYWW NNN Legend: XX...
PAGE 16
MCP2551 8-Lead Plastic Dual In-Line (P) – 300 mil Body [PDIP] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging N NOTE 1 E1 1 3 2 D E A2 A L A1 c e eB b1 b Units Dimension Limits Number of Pins INCHES MIN N NOM MAX 8 Pitch e Top to Seating Plane A – – .210 Molded Package Thickness A2 .115 .130 .195 Base to Seating Plane A1 .015 – – Shoulder to Shoulder Width E .290 .310 .
PAGE 17
MCP2551 8-Lead Plastic Small Outline (SN) – Narrow, 3.90 mm Body [SOIC] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging D e N E E1 NOTE 1 1 2 3 α h b h A2 A c φ L A1 L1 Units Dimension Limits Number of Pins β MILLMETERS MIN N NOM MAX 8 Pitch e Overall Height A – 1.27 BSC – Molded Package Thickness A2 1.25 – – Standoff § A1 0.10 – 0.
PAGE 19
MCP2551 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device X /XX Temperature Range Package Device: MCP2551= High-Speed CAN Transceiver Temperature Range: I E Package: P SN = = Examples: a) MCP2551-I/P: Industrial temperature, PDIP package. b) MCP2551-E/P: Extended temperature, PDIP package. c) MCP2551-I/SN: Industrial temperature, SOIC package.
PAGE 21
MCP2551 APPENDIX A: REVISION HISTORY Revision E (January 2007) This revision includes updates to the packaging diagrams. © 2007 Microchip Technology Inc.
PAGE 23
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 24
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