IL41050-1-01

® IsoLoop Isolated QSOP CAN Transceiver Evaluation Board Board No.: IL41050-1-01 NVE Corporation (952) 829-9217 iso-apps@nve.com YouTube.com/NveCorporation www.nve.com About This Evaluation Board This Evaluation Board provides a complete isolated CAN node using the world’s smallest isolated CAN transceiver—the IL41050TA-1E QSOP isolated transceiver. The IL41050TA is a galvanically isolated, CAN (Controller Area Network) transceiver, designed as the interface between the CAN protocol controller and the physical bus. Advanced features facilitate reliable bus operation. Unpowered nodes do not disturb the bus, and a unique non-volatile programmable power-up feature prevents unstable nodes. The devices also have a hardware-selectable silent mode that disables the transmitter. Unlike optocouplers or other isolation technologies, IsoLoop isolators have virtually indefinite barrier life. Designed for harsh CAN and DeviceNet environments, IL41050 transceivers have transmit data dominant time-out, bus pin transient protection, a rugged Charged Device Model ESD rating, thermal shutdown protection, and short-circuit protection. Unique edge-triggered inputs improve noise performance. NVE offers four CAN transceiver models: Max. Operating Model Temp. Mbps IL41050TTE 100°C 1 IL41050TAE 125°C 1 IL41050TA-3E 125°C 1 IL41050TA-1E 125°C 1 NVE Corporation (952) 829-9217 Key Features Low Cost Silent Mode Silent Mode; narrow-body package Silent Mode; ultraminiature QSOP iso-apps@nve.com YouTube.com/NveCorporation Package 0.3" SOIC-16 0.3" SOIC-16 0.15" SOIC-16 QSOP-16 www.nve.com Circuit Diagram VDD1 VDD2 C DD1 Isolation Boundary C DD2 100 nF 1 100 nF 16 S 11 TxD RxD 9 4 RL 120R 5 10 CANH CANL 12 IsoRxD GND1 IL41050 TA-1E pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol VDD1 NC GND1 TxD RxD NC NC NC CANH CANL S IsoRxD NC GND2 NC VDD2 NVE Corporation 3 14 IL41050TA-1E GND2 Description VDD1 power supply No internal connection VDD1 power supply ground return Transmit Data input Receive Data output No internal connection No internal connection No internal connection High level CANbus line Low level CANbus line Mode select input (open or low for normal operation; high for silent mode) Isolated RxD output (normally not used; for test purposes only) No internal connection Bus ground No internal connection Bus power supply input (952) 829-9217 iso-apps@nve.com YouTube.com/NveCorporation www.nve.com Application Information Power Supply Decoupling Both VDD1 and VDD2 must be bypassed with 100 nF ceramic capacitors. These supply the dynamic current required for the isolator switching and should be placed as close as possible to VDD and their respective ground return pins. Input Configurations The TxD input should not be left open as the state will be indeterminate. If connected to an open-drain or open collector output, a pull-up resistor (typically 16 kΩ) should be connected from the input to VDD1. The Mode Select (“S”) input has a 150 kΩ nominal internal pull-down resistor. It can be left open or set low for normal operation. Bus Termination Because of their relatively low speed, CAN networks can sometimes be unterminated, but reflections are minimized by terminating both ends of the bus (but not every node). Two 120 Ω termination resistors are generally used to match a 60 Ω cable impedance. This kit comes with a 120 Ω termination resistor. The resistor can be removed for multi-node configurations. Level Shifting As shown in the figure below, the IL41050 can provide isolation and level shifting between a 5 volt CAN bus and a 3.3 volt microcontroller such as an SJA1000. VDD2 = 5V VDD1 = 3.3V C DD1 C DD2 XTAL1 SJA1000 Dominant Mode Time-out and Failsafe Receiver Functions CAN bus latch up is prevented by an integrated Dominant mode timeout function. If the TxD pin is forced permanently low by hardware or software application failure, the time-out returns the RxD output to the high state no more than 765 µs after TxD is asserted dominant. The timer is triggered by a negative edge on TxD. If the duration of the low is longer than the internal timer value, the transmitter is disabled, driving the bus to the recessive state. The timer is reset by a positive edge on pin TxD. If VDD2 power is lost, the IL41050 asserts the RxD output high when the supply voltage falls below 3.8 volts. RxD will return to normal operation when VDD2 rises above approximately 4.2 volts. Programmable Power-Up A unique non-volatile programmable power-up feature prevents unstable nodes. A state that needs to be present at node power up can be programmed at the last power down. For example if a CAN node is required to “pulse” dominant at power up, TxD can be sent low by the controller immediately prior to power down. When power is resumed, the node will immediately go dominant allowing self-check code in the microcontroller to verify node operation. If desired, the node can also power up silently by presetting the TxD line high at power down. At the next power on, the IL41050 will remain silent, awaiting a dominant state from the bus. 100 nF 100 nF ADR 0...7, CS IsoRxD Output The IsoRxD output is an isolated versions of the RxD, which the chip provides for troubleshooting. Normally no connections are made to the pin. Tx0 TxD CANH Rx0 RxD CANL The microcontroller can check that the CAN node powered down correctly before applying power at the next “power on” request. If the node powered down as intended, RxD will be set high and stored in the IL41050’s non-volatile memory. The level stored in the RxD bit can be read before isolated node power is enabled, avoiding possible CAN bus disruption due to an unstable node. XTAL2 IL41050 GND1 NVE Corporation (952) 829-9217 iso-apps@nve.com GND2 YouTube.com/NveCorporation www.nve.com NVE Corporation (952) 829-9217 iso-apps@nve.com YouTube.com/NveCorporation www.nve.com Specification Highlights and Quickstart IL41050TA Specification Highlights: • Fully compliant with the ISO 11898 CAN standard • 3.0 V to 5.5 V input power supplies • 12 mA maximum quiescent recessive supply current • 70 mA maximum bus-side dynamic supply current • 1200 VRMS 1 minute isolation (QSOP); 2500 VRMS for narrow and wide SOIC versions • ±500 V CDM ESD • 1 Mbps • 50 kV/µs transient immunity • Silent mode to disable transmitter • Unpowered nodes do not disturb the bus • Edge triggered, non-volatile input improves noise performance • Thermal shutdown protection • Short-circuit protection for ground and bus power • −55°C to +125°C operating temperature • QSOP, 0.15" SOIC, or 0.3" True 8™ mm 16-pin packages • VDE V 0884 certified; UL 1577 recognized Quick Start: • Connect VDD1 to a 3.3 V power supply and VDD2 to 5 V. • Connect a 500 kHz signal generator to the “TxD” input. • Verify the “RxD” and CAN outputs on an oscilloscope: TxD RxD CANH CANL Visit www.nve.com for datasheets. NVE Corporation (952) 829-9217 iso-apps@nve.com YouTube.com/NveCorporation www.nve.com Evaluation Board Layout 100 nF decoupling capacitors close to VDD1 and VDD2 pins Power supply connections CANbus connections Input connections Test points (13 places) IL41050-1-06 IL41050TA-1E QSOP isolated CAN transceiver NVE Corporation (952) 829-9217 120Ω bus termination resistor iso-apps@nve.com YouTube.com/NveCorporation www.nve.com Limited Warranty and Liability Information in this document is believed to be accurate and reliable. However, NVE does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. In no event shall NVE be liable for any indirect, incidental, punitive, special or consequential damages (including, without limitation, lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. Right to Make Changes NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions at any time and without notice. Use in Life-Critical or Safety-Critical Applications Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the customer shall indemnify and hold NVE harmless against all claims and damages. Applications Applications described in this document are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NVE products, and NVE accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NVE product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customers. Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NVE does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customers. The customer is responsible for all necessary testing for the customer’s applications and products using NVE products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customers. NVE accepts no liability in this respect. An ISO 9001 Certified Company NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 ©NVE Corporation All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. Manual No.: ISB-CB-013 November 2017 NVE Corporation (952) 829-9217 iso-apps@nve.com YouTube.com/NveCorporation www.nve.com