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ISO1050DUB Datasheet(PDF) 4 Page - Texas Instruments |
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ISO1050DUB Datasheet(HTML) 4 Page - Texas Instruments |
4 / 33 page ISO1050 SLLS983H – JUNE 2009 – REVISED JUNE 2013 www.ti.com DRIVER AND RECEIVER FUNCTION TABLES Table 1. Driver Function Table INPUT OUTPUTS DRIVEN BUS STATE TXD(1) CANH(1) CANL(1) L H L Dominant H Z Z Recessive (1) H = high level, L = low level, Z = common mode (recessive) bias to VCC / 2. See Figure 1 and Figure 2 for bus state and common mode bias information. Table 2. Receiver Function Table CAN DIFFERENTIAL INPUTS DEVICE MODE BUS STATE RXD PIN(1) VID = VCANH – VCANL VID ≥ 0.9 V Dominant L 0.5 V < VID < 0.9 V ? ? Normal or Silent VID ≤ 0.5 V Recessive H Open (VID ≈ 0 V) Open H (1) H = high level, L = low level, ? = indeterminate. DIGITAL INPUTS AND OUTPUTS TXD (Input) and RXD (Output): VCC1 for the isolated digital input and output side of the device maybe supplied by a 3.3 V or 5 V supply and thus the digital inputs and outputs are 3.3 V and 5 V compatible. NOTE TXD is very weakly internally pulled up to VCC1. An external pull up resistor should be used to make sure that TXD is biased to recessive (high) level to avoid issues on the bus if the microprocessor doesn't control the pin and TXD floats. TXD pullup strength and CAN bit timing require special consideration when the device is used with an open-drain TXD output on the microprocessor's CAN controller. An adequate external pullup resistor must be used to ensure that the TXD output of the microprocessor maintains adequate bit timing input to the input on the transceiver. PROTECTION FEATURES TXD Dominant Timeout (DTO) TXD DTO circuit prevents the local node from blocking network communication in the event of a hardware or software failure where TXD is held dominant longer than the timeout period tTXD_DTO. The TXD DTO circuit timer starts on a falling edge on TXD. The TXD DTO circuit disables the CAN bus driver if no rising edge is seen before the timeout period expires. This frees the bus for communication between other nodes on the network. The CAN driver is re-activated when a recessive signal is seen on the TXD pin, thus clearing the TXD DTO condition. The receiver and RXD pin still reflect the CAN bus, and the bus pins are biased to recessive level during a TXD dominant timeout. NOTE The minimum dominant TXD time allowed by the TXD DTO circuit limits the minimum possible transmitted data rate of the device. The CAN protocol allows a maximum of eleven successive dominant bits (on TXD) for the worst case, where five successive dominant bits are followed immediately by an error frame. This, along with the tTXD_DTO minimum, limits the minimum data rate. Calculate the minimum transmitted data rate by: Minimum Data Rate = 11 / tTXD_DTO. 4 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: ISO1050 |
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