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MAX13041 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX13041 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 21 page Detailed Description The MAX13041 ±80V fault-protected, high-speed CAN transceiver is intended for high-speed industrial and automotive network applications where high reliability and advanced power management are required. The device links a CAN protocol controller to the physical bus wires of the controller area network (CAN) and allows communication at speeds up to 1Mbps. Built-in level shifting allows for direct connection to protocol con- trollers operating from lower voltages. The extended fault-protected voltage range of ±80V on CAN bus lines allows for use in +12V or +42V automotive, and higher voltage +24V and +36V heavy-duty truck applications. Advanced power management features make the MAX13041 ideal for automotive electronic control unit (ECU) modules that are permanently supplied by bat- tery, regardless of the ignition switch position (clamp- 30, type-A modules). The device controls one or more external voltage regulators to provide a low-power sleep mode for an entire clamp-30 node. Wake-on CAN capability allows the MAX13041 to restore power to the node upon detection of CAN bus activity. The MAX13041 is functionally compatible with the Philips TJA1041A and is a pin-to-pin replacement with improved performance. CAN Interface The ISO11898 specification describes the physical layer of a controller area network (CAN). A CAN imple- mentation is comprised of multiple transceiver modules linked by a pair of bus wires. Communication between modules occurs through transmission and reception of differential logic states on the bus lines. Two compli- mentary logic states are defined by ISO11898. A domi- nant state results when the differential voltage on the CAN bus lines is greater than 0.9V. A recessive bus state results when the differential voltage is less than 0.5V (Figure 1). The CAN bus exhibits a wired-AND characteristic, meaning the bus is only recessive when all connected transmitters are recessive. Any transmit- ter asserting a dominant logic state forces the entire CAN bus dominant. The MAX13041 accepts logic-level data from the CAN protocol controller on TXD. Drive TXD low to assert a dominant state on the CAN bus. Drive TXD high to release the CAN bus to a recessive state. TXD is inter- nally pulled up to VI/O. The state of the CAN bus is pre- sented to the protocol controller as a logic level on RXD. The MAX13041 receiver remains active during transmission to allow for the bit-wise arbitration scheme specified by the CAN protocol. Level Shifting The MAX13041 provides level shifting on TXD, RXD, EN, STB, WAKE and ERR for compatibility with lower- voltage protocol controllers. Set the interface logic lev- els for TXD, RXD, EN, STB, WAKE, and ERR by connecting VI/O to the supply voltage of a CAN protocol controller, or another voltage from +2.8V to +5.25V. Split-Termination and Common-Mode Voltage Stabilization The CAN bus specification requires a total bus load resis- tance of 60Ω. Each end of the bus should be terminated with 120Ω, the characteristic impedance of the bus line. Electromagnetic emission (EME) is reduced by a split-ter- mination method, whereby each end of the bus line is ter- minated by 120Ω split into two 60Ω resistors in series (see Figure 3). A bypass capacitor shunts noise to ground from the node connecting the 60Ω resistors. When the CAN bus is recessive, the common-mode voltage is pulled low by the leakage current from inac- tive modules. When the CAN bus subsequently goes dominant, the proper common-mode voltage is restored by the transmitting device. A common-mode voltage step results, generating excessive EME. To mit- igate this problem, the common-mode voltage of the bus is forced to VCC/2 by biasing the split-termination node (see Figure 3). During normal and PWON/listen- only modes, a stabilized DC voltage of VCC/2 is present on SPLIT. Connect SPLIT to the node connecting the two 60Ω termination resistors to stabilize the common- mode voltage of the bus and prevent EME from com- mon-mode voltage steps. Power-Management Operating Modes The MAX13041 provides advanced power management for a clamp-30 node by controlling one or more external voltage regulators. Five operating modes provide differ- ent functionality to minimize power consumption. ±80V Fault-Protected High-Speed CAN Transceiver with Low-Power Management and Wake-On CAN ______________________________________________________________________________________ 11 SPLIT CANH CANL RT 60 Ω CSPLIT RT 60 Ω Figure 3. Biased Split Termination |
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