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Rad-tolerant 3.3V CAN transceivers aimed at satellite comms

Posted: 20 Nov 2015     Print Version  Bookmark and Share

Keywords:Intersil  CAN  transceiver  satellite 

Intersil Corp. has announced what it says is the industry's first radiation tolerant 3.3V controller area network (CAN) transceivers that are fully QML-V qualified and compliant with the ISO11898-2 physical layer standard. The three ISL7202xSEH CAN transceivers claim to offer reliable serial data transmission between a CAN controller and CAN bus at speeds up to 1Mb/s.

Up to 120 of Intersil's ISL7202xSEH transceivers can be connected to a single CAN bus to reduce cabling/harness size, weight and power (SWAP) costs. This weight and mass reduction of up to 18 per cent allows system engineers to add millions of dollars in satellite functionality, and eliminate the extra cabling and tradeoffs associated with current point-to-point interface solutions.

ISL7202xSEH transceivers

The ISL72026SEH, ISL72027SEH and ISL72028SEH 3.3V CAN transceivers deliver ultra-high performance in the most demanding environments by leveraging Intersil's proprietary silicon on insulator process, which provides single event latch-up (SEL) and single event burn-out (SEB) robustness in heavy ion environments, noted the company. With the emergence of all-electric propulsion satellites that maximise payload but take longer to reach final orbit, customers require higher total dose testing for mission assurance. The CAN transceivers are low dose rate tested up to 75krad on a wafer-by-wafer basis, and apply single event transient (SET) mitigation techniques to reduce system level bit error rates, providing predictable performance. They are also "cold spare" redundant capable, allowing the connection of additional unpowered transceivers to the CAN bus. This mission critical capability maximises system life.

The ISL7202xSEH family offers a number of unique features: The ISL72026SEH includes a loopback test capability that allows node diagnostics and reporting while the system is transmitting data. It also includes a listen mode feature that powers down the driver circuitry while keeping the receiver active to listen for data on the bus, and then activates the driver after data is received. The ISL72027SEH also offers split termination output using the Vref pin to provide a Vcc/2 output reference. This improves network electromagnetic compatibility and stabilises the bus voltage, preventing it from drifting to a high common-mode voltage during inactive periods. The ISL72028SEH includes a low power shutdown mode that switches off the driver and receiver to draw 50µA for power conservation.

The devices are electrically screened to SMD 5962-15228, and compatible with ISO11898-2 and deliver 4kV human body model (HBM) ESD protection on all pins. They support 3V to 3.6V supply range, -7V to 12V common-mode input voltage range, 5V tolerant logic inputs, and bus pin fault protection to ±20V terrestrial and ±18V in orbit.

The CAN transceivers have Hi Z input that allows for 120 nodes on the bus and data rates up to 1Mb/s; low quiescent supply current of 7mA; support thermal shutdown; low dose rate (0.01rad(Si)/s) radiation tolerance of 75krad(Si); and SEL/B immune up to LET 60MeV.cm2/mg.

The ISL7202xSEH 3.3V CAN transceivers can be combined with the ISL71590SEH temperature sensor, ISL71090SEH or ISL71091SEH voltage references, ISL70444SEH, ISL70417SEH, ISL70218SEH, and ISL70227SEH operational amplifiers, ISL71840SEH multiplexer, and LDO regulators such as the ISL75051SEH and ISL75052SEH to support telemetry data handling for satellite payload systems with superior radiation tolerant performance.

ISL7202xSEH CAN transceiver block diagram

ISL7202xSEH CAN transceiver block diagram

The ISL72026SEH, ISL72027SEH and ISL72028SEH 3.3V CAN transceivers are available in 8-lead ceramic flatpack packages, and are U.S. Department of Commerce export approved under classification 5A991.b. They are also available in die form. An evaluation board for each CAN transceiver, ISL72026SEHEVAL1Z, ISL72027SEHEVAL1Z and ISL72028SEHEVAL1Z, is available to evaluate device features and performance.

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