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Philips Semiconductors Product specification 8-bit microcontroller with on-chip CAN P8xC592 handbook, full pagewidth C1 100 nF D1 1N4150 R1 120 Ω C2 100 nF R2 120 Ω 1N4150 D2 5 V C3 100 nF D3 1N4150 R3 120 Ω C4 100 nF R4 120 Ω 1N4150 D4 BUS NODE Fig.39 Bus termination with decoupled wires. 1996 Jun 27 96 CAN BUS LINE (1) (1) Characteristic line impedance 120 Ω C5 100 nF D5 1N4150 R5 120 Ω C6 100 nF R6 120 Ω 1N4150 D6 5 V C7 100 nF D7 1N4150 R7 120 Ω C8 100 nF R8 120 Ω 1N4150 D8 MGA188
Philips Semiconductors Product specification 8-bit microcontroller with on-chip CAN P8xC592 22.2.4 CONNECTION TO AN OPTICAL BUS LINE Using an optical medium provides the following advantages: • Bus nodes are galvanically decoupled. • Optical cable features very high noise immunity. • No noise emission by the bus cable. An example for an interface to an optical connector is given in Fig.40. In most cases a transistor is required to amplify the TX-output current. handbook, full pagewidth OUTPUT CONTROL REGISTER 00011110B (1EH) or 00010110B (16H) T1 BS170 R1 56 Ω 1996 Jun 27 97 5 V R2 3.9 kΩ 5 V OPTICAL CONNECTOR HBFR - 0501 SERIES P8xC592 CTX0 CTX1 CRX0 CRX1 Thus more optical power is provided to compensate for losses in the optical connectors and the optical star. The P8xC592 features an on-chip 1 ⁄2AVDD reference voltage output so only a capacitor is required for the receiver part. Two optical fibres are used to connect the bus nodes. The TX-fibre transfers the output signal of the CAN-controller to the optical star. The optical star transfers the TX-fibre input signal over to all the RX-fibres. The RX-fibres transfer the resulting optical signal over to the receivers of all the bus nodes. optical cable PASSIVE OPTICAL STAR Fig.40 Optical Transceiver. C2 100 nF REFOUT MGA189 C1 10 nF
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