CB3
8 CANBus Channels, CAN 2.0 A/B Protocol or J1939 Protocol
The CB3 is an NAI Configurable Open Systems Architecture™ (COSA®) module that delivers rugged, high-density CAN bus communications. Designed for seamless integration with NAI embedded boards and systems, the CB3 features eight independent, galvanically-isolated channels, each of which can be individually programmed and configured to support a wide range of communication requirements.
The CB3 offers per-channel programmability for either classical CAN 2.0 A/B or SAE J1939, providing maximum flexibility and making it well-suited for applications such as vehicle and engine control and monitoring, equipment networking, avionics integration for mission and vehicle control, and general control and monitoring of defense subsystems.
The CB3 supports data rates up to 1 Mbps (per ISO 11898-1/-2), features Initiated Built-in-Test (IBIT), and integrates seamlessly within the NAI COSA® ecosystem for modular, field-proven embedded systems.
Features
- Eight independent galvanically-isolated transceiver channels
- Implements classical CAN per ISO 11898-1 and ISO 11898-2, supporting data rates up to 1 Mbps per channel
- Programmable per channel (CAN 2.0A/B or J1939)
- Supports 11-bit (standard) and 29-bit (extended) CAN identifiers.
- Built-in error detection and fault confinement per ISO 11898 for reliable network operation
- Error status registers and Initiated Built-In-Test (IBIT) self-test (loopback) mode
- Optimized for NAI COSA SerDes system integration, supporting modular embedded architectures
- Number of Channels: 8 Transceiver Channels (galvanically isolated)
- CAN Protocol: Selectable, by channel, for either Version 2.0 Part A/Part B or Version SAE J1939
- Data Rate: Up to 1 Mbps (ISO 11898-1/-2); J1939 typically limited to 500 kbps depending on implementation
- Data Length: 2.0A/B: 8 bytes; J1939: up to 1785 bytes
- Power: 210 mA @ 5 V per channel typical
- Weight: 1.5 oz. (42 g)
Core Supported Standards
| Standard/Spec | Definition | CB3 |
| ISO 11898-1 | Underlying classical CAN DataLink layer | Yes |
| ISO 11898-2 | High-speed CAN physical layer (support up to 1 Mbps) | Yes |
| SAE J1939 (parent) | Standardized CANbus communications protocol for vehicle and equipment ECUs | Yes |
| SAE J1939-21 | J1939 DataLink & TP layer | Yes |
| SAE J1939-81 | Address-claim arbitration (Networking Management) | Yes |
| SAE J1939-82 | Compliance tests for J1939 ECUs (IP supplier self-compliance - not performed by NAI) | Partial (via IP supplier validation) |
docs.naii.com Link
9/10/2025 7:56:25 AM
NAI’s Configurable Open Systems Architecture™ (COSA®) offers a choice of over 100 smart I/O, communication, and Ethernet switch functions, providing the highest package density and greatest flexibility of any multifunction I/O board in the industry. Preexisting, fully-tested functions can be combined quickly and easily in an unlimited number of ways. Choose the ideal platform for your application below. Each I/O function has dedicated processing, unburdening the system Single Board Computer (SBC) from unnecessary data management overhead.
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