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SZNUP2105LT3G Fiches technique(PDF) 4 Page - ON Semiconductor |
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SZNUP2105LT3G Fiches technique(HTML) 4 Page - ON Semiconductor |
4 / 8 page NUP2105L, SZNUP2105L http://onsemi.com 4 APPLICATIONS Background The Controller Area Network (CAN) is a serial communication protocol designed for providing reliable high speed data transmission in harsh environments. TVS diodes provide a low cost solution to conducted and radiated Electromagnetic Interference (EMI) and Electrostatic Discharge (ESD) noise problems. The noise immunity level and reliability of CAN transceivers can be easily increased by adding external TVS diodes to prevent transient voltage failures. The NUP2105L provides a transient voltage suppression solution for CAN data communication lines. The NUP2105L is a dual bidirectional TVS device in a compact SOT−23 package. This device is based on Zener technology that optimizes the active area of a PN junction to provide robust protection against transient EMI surge voltage and ESD. The NUP2105L has been tested to EMI and ESD levels that exceed the specifications of popular high speed CAN networks. CAN Physical Layer Requirements Table 1 provides a summary of the system requirements for a CAN transceiver. The ISO 11898−2 physical layer specification forms the baseline for most CAN systems. The transceiver requirements for the Honeywell Smart Distribution Systems (SDS) and Rockwell (Allen−Bradley) DeviceNet high speed CAN networks are similar to ISO 11898−2. The SDS and DeviceNet transceiver requirements are similar to ISO 11898−2; however, they include minor modifications required in an industrial environment. Table 1. Transceiver Requirements for High−Speed CAN Networks Parameter ISO 11898−2 SDS Physical Layer Specification 2.0 DeviceNet Min / Max Bus Voltage (12 V System) −3.0 V / 16 V 11 V / 25 V Same as ISO 11898−2 Common Mode Bus Voltage CAN_L: −2.0 V (min) 2.5 V (nom) CAN_H: 2.5 V (nom) 7.0 V (max) Same as ISO 11898−2 Same as ISO 11898−2 Transmission Speed 1.0 Mb/s @ 40 m 125 kb/s @ 500 m Same as ISO 11898−2 500 kb/s @ 100 m 125 kb/s @ 500 m ESD Not specified, recommended w $8.0 kV (contact) Not specified, recommended w $8.0 kV (contact) Not specified, recommended w $8.0 kV (contact) EMI Immunity ISO 7637−3, pulses ‘a’ and ‘b’ IEC 61000−4−4 EFT Same as ISO 11898−2 Popular Applications Automotive, Truck, Medical and Marine Systems Industrial Control Systems Industrial Control Systems |
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