M 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 conditio
MCP2551 NOTES: DS21667D-page 2 2003 Microchip Technology Inc.
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.
MCP2551 TABLE 1-1: MODES OF OPERATION Mode Current at Rs Pin -IRS < 10 µA 10 µA < -IRS < 200 µA -IRS < 610 µA Standby Slope-control High-speed TABLE 1-2: Resulting Voltage at RS Pin 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 VRS > 0.75 VDD Not Driven Not Driven Recessive VPOR < V DD < 4.5V VRS < 0.
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.
MCP2551 NOTES: DS21667D-page 6 2003 Microchip Technology Inc.
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.
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) ..........................................................................................................
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.
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.
MCP2551 FIGURE 2-2: TEST CIRCUIT FOR AUTOMOTIVE TRANSIENTS CANH TXD VREF CAN Transceiver 500 pF 60Ω Schaffner Generator RXD CANL RS GND 500 pF 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.
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 Bit time 1 62.
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.
MCP2551 NOTES: DS21667D-page 14 2003 Microchip Technology Inc.
MCP2551 3.0 PACKAGING INFORMATION 3.1 Package Marking Information 8-Lead PDIP (300 mil) XXXXXXXX XXXXXNNN YYWW 8-Lead SOIC (150 mil) XXXXXXXX XXXXYYWW NNN Legend: Note: * XX...
MCP2551 8-Lead Plastic Dual In-line (P) – 300 mil (PDIP) E1 D 2 n 1 α E A2 A L c A1 β B1 p eB B Units Dimension Limits n p Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip to Seating Plane Lead Thickness Upper Lead Width Lower Lead Width Overall Row Spacing Mold Draft Angle Top Mold Draft Angle Bottom * Controlling Parameter § Significant Characteristic § A A2 A1 E E1 D L c B1 B eB α β
MCP2551 8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC) E E1 p D 2 B n 1 h α 45° c A2 A φ β L Units Dimension Limits n p Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Chamfer Distance Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top Mold Draft Angle Bottom * Controlling Parameter § Significant Characteristic A A2 A1 E E1 D h L φ c B α β MIN .053 .052 .004 .228 .146 .189 .010 .019 0 .
MCP2551 NOTES: DS21667D-page 18 2003 Microchip Technology Inc.
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.
MCP2551 NOTES: DS21667D-page 20 2003 Microchip Technology Inc.
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.
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