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Isolated CAN transceiver for harsh environments

The ISO1050 is a galvanically isolated CAN transceiver by Texas Instruments (USA) that meets the specifications of ISO 11898-2. The transceiver is characterized for operation over the ambient temperature range of -55 °C to 105 °C.

AS A CAN TRANSCEIVER, THE DEVICE PROVIDES differential transmit capability to the network and differential receive capability to a CAN controller at signaling rates up to 1 Mbit/s. Designed for operation in especially harsh environments, the device features cross-wire, overvoltage and loss of ground protection from –27 V to 40 V and over-temperature shut-down, as well as –12 V to 12 V common-mode range. It’s I/O voltage range supports 3,3 V- and 5 V-microprocessors.

The CAN network has two states during operation: dominant and recessive. A dominant network state, equivalent to logic low, occurs when the network is driven differentially by a driver. A recessive network state is when the network is biased to a common mode of VCC / 2 via the high-resistance internal input resistors of the receiver, equivalent to a logic high. The host microprocessor of the CAN node will use the TXD pin to drive the network and will receive data from the network on the RXD pin.

Normal & silent mode
Bus states (physical bit representation)
The device has its logic input and output buffers separated by a silicon oxide (SiO2) insulation barrier that provides galvanic isolation of up to 5000 VRMS for ISO1050DW and 2500 VRMS for ISO1050DUB. Used in conjunction with isolated power supplies, the device prevents noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. The 5 KVRMS reinforced insulation has been approved by TÜV. The transceiver is also IEC 60747-5-2 (VDE 0884, Rev. 2), IEC 61010-1, and UL 1577 double protection approved; as well as IEC 60601-1 (medical) and CSA.

Possible applications include industrial automation, control, sensors and drive systems, building and climate control automation, security systems, and CAN networks, such as CANopen, DeviceNet, NMEA2000, and ARINC825.