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ISL72026SEH Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL72026SEH Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 18 page ISL72026SEH 10 FN8762.1 November 9, 2015 Submit Document Feedback Functional Description Overview The Intersil ISL72026SEH is a 3.3V radiation tolerant CAN transceiver that is compatible with the ISO11898-2 standard for use in CAN (Controller Area Network) serial communication systems. The device performs transmit and receive functions between the CAN controller and the CAN differential bus. It can transmit and receive at bus speeds of up to 1Mbps. It is designed to operate over a common mode range of -7V to +12V with a maximum of 120 nodes. The device is capable of withstanding ±20V on the CANH and CANL bus pins outside of ion beam and ±16V under ion beam. Slope Adjustment The output driver rise and fall time has three distinct selections that may be chosen by using a resistor from the RS pin to GND. Connecting the RS pin directly to GND results in output switching times that are the fastest, limited only by the drive capability of the output stage. RS = 10kΩ provides for a typical slew rate of 8V/µs and RS = 50kΩ provides for a typical slew rate of 4V/µs. Putting a high logic level to the RS pin places the device in a low current listen mode. The protocol controller uses this mode to switch between low power listen mode and normal transmit mode. Cable Length The device can work per ISO11898 specification with a 40m cable and stub length of 0.3m and 60 nodes at 1Mbps. This is greater than the ISO requirement of 30 nodes. The cable type specified is twisted pair (shielded or unshielded) with a characteristic impedance of 120Ω. Resistors equal to this are to be terminated at both ends of the cable. Stubs should be kept as short as possible to prevent reflections. Cold Spare High reliability system designers implementing data communications have to be sensitive to the potential for single point failures. To mitigate the risk of a failure they will use redundant bus transceivers in parallel. In this arrangement both active and quiescent devices can be present simultaneously on the bus. The quiescent devices are powered down for cold spare and do not affect the communication of the other active nodes. To achieve this, a powered down transceiver (VCC < 200mV) has a resistance between the CANH or CANL bus pin and the VCC supply rail of > 480kΩ (max) with a typical resistance > 2MΩ. The resistance between CANH and CANL of a powered-down transceiver has a typical resistance of 80kΩ. Listen Mode When a high level is applied to the RS pin, the device enters a low power listen mode. The driver of the transceiver is switched off to conserve power while the receiver remains active. In listen mode the transceiver draws 2mA (max) of current. A low level on the RS pin brings the device back to normal operation. Loopback Mode When a high level is applied to the LBK pin, the device enters the loopback state. The transceiver CANH and CANL pins are disconnected from the bus. The driver and receiver circuitry of the transceiver remains active to allow for diagnostic testing of the node. Using 3.3V Devices in 5V Systems Looking at the differential voltage of both the 3.3V and 5V devices, the differential voltage is the same, the recessive common mode output is the same. The dominant common mode output voltage is slightly lower than the 5V counterparts. The receiver specs are also the same. Though the electrical parameters appear compatible it is advised that necessary system testing be performed to verify interchangeable operation. FIGURE 19A. OUTPUT SHORT CIRCUIT CURRENT TEST CIRCUIT FIGURE 19B. OUTPUT SHORT CIRCUIT CURRENT WAVEFORMS FIGURE 19. OUTPUT SHORT CIRCUIT CURRENT Test Circuits and Waveforms (Continued) D CANH CANL GND GND + - VIN = -7V OR 12V IO(SRT) IO(SRT) |IO(SRT)| 0A 0V VIN VIN 12V -7V 10ms |
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