This user’s guide describes the evaluation module (EVM) for the family of ISO1044 isolated CAN transceivers. This EVM allows designers to evaluate device performance for fast development and analysis of isolated systems. The EVM supports evaluation of all ISO1044 devices in a 8-pin SOIC (D) package.
CAUTION
This evaluation module is made available for isolator parameter performance evaluation only and is not intended for isolation voltage testing. To prevent damage to the EVM, any voltage applied as a supply or digital input/output must be maintained within the 0 V to 5.5 V recommended operating range.
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This user’s guide describes EVM operation with respect to the ISO1044 isolated CAN transceiver. The EVM includes test points for all main points where probing is necessary for evaluation such as GND, VCC, TXD, RXD, CANH, CANL. The EVM supports many options for CAN bus configuration. It is pre-configured with a split termination network with a common-mode capacitance and additional caps on the bus for protection. It also includes an option to populate a 120-Ω resistor which can be used with the EVM as a terminated line end (CAN is defined for 120-Ω impedance twisted pair cable). Pads are provided to add protection components like TVS diodes and common mode (CM) chokes. By default, bypass paths are used around those devices.Using these options, the customer is allowed installation of the desired components. This guide describes the EVM schematic, layout and typical laboratory setup. A typical input and output waveform is also presented.
The ISO1044 device is a galvanically-isolated controller area network (CAN) transceiver that meets the specifications of the ISO11898-2 (2016) standard. The ISO1044 device offers ±58-V DC bus fault protection and ±12-V common-mode voltage range. The device supports up to 5-Mbps data rate in CAN FD mode allowing much faster transfer of payload compared to classic CAN. This device uses a silicon dioxide (SiO2) insulation barrier with a withstand voltage of 3000 VRMS. 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.