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MCP2551 Datasheet(PDF) 7 Page - Microchip Technology |
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MCP2551 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 24 page © 2010 Microchip Technology Inc. DS21667F-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. 2.1.2 COMMON MODE BUS VOLTAGE RANGE Boundary voltage levels of VCANL and VCANH with respect to ground, for which proper operation will occur, if up to the maximum number of CAN nodes are connected to the bus. 2.1.3 DIFFERENTIAL INTERNAL CAPACITANCE, CDIFF (OF A CAN NODE) Capacitance seen between CANL and CANH during the Recessive state when the CAN node is disconnected from the bus (see Figure 2-1). 2.1.4 DIFFERENTIAL INTERNAL RESISTANCE, RDIFF (OF A CAN NODE) Resistance seen between CANL and CANH during the Recessive state when the CAN node is disconnected from the bus (see Figure 2-1). 2.1.5 DIFFERENTIAL VOLTAGE, VDIFF (OF CAN BUS) Differential voltage of the two-wire CAN bus, value VDIFF = VCANH - VCANL. 2.1.6 INTERNAL CAPACITANCE, CIN (OF A CAN NODE) Capacitance seen between CANL (or CANH) and ground during the Recessive state when the CAN node is disconnected from the bus (see Figure 2-1). 2.1.7 INTERNAL RESISTANCE, RIN (OF A CAN NODE) Resistance seen between CANL (or CANH) and ground during the Recessive state when the CAN node is disconnected from the bus (see Figure 2-1). FIGURE 2-1: PHYSICAL LAYER DEFINITIONS RIN RIN RDIFF CIN CIN CDIFF CANL CANH GROUND ECU |
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