The CA-IS2092A family of devices is galvanically-isolated RS-485 transceivers with built-in isolated DC-DC converter. It eliminates the need for a separate isolated power supply in space constrained isolated designs.
The transceivers have the logic input and output buffers separated by a silicon oxide (SiO2) insulation barrier that provides up to 2.5kVRMS (60 seconds) of galvanic isolation and ±150kV/μs typical CMTI. Isolation improves data communication by breaking ground loops and reducing noise, especially where there are large differences in ground potential between ports. An integrated DC-DC converter generates the 3.3V or 5V operating voltage for the cable-side.
The CA-IS2092A provides half-duplex transceivers. This device provides a slow slew rate to minimize EMI and reflections, allowing for error-free data transmission up to 0.5Mbps. The individual logic supply input is compatible with logic levels from 2.5V to 5.5V on the logic input lines.
The CA-IS2092A device is available in LGA16 package and operates over -40°C to +125°C temperature range. The CA-IS2092A transceivers find applications across various sectors such as industrial automation equipment, solar inverters, motor drivers, and building automation systems.
Isolated RS-485 Transceiver Part Selection
The CA-IS209x/CA-IS309x series devices (except CA-IS2092A) are available in wide-body 16-pin SOIC package which are the industry standard isolated RS-485/RS-422 package, and the CA-IS2092A device is available in small LGA16 package.
| Part Number | Data Rate (Mbps) | Isolation Rating (kVrms) | Package | Size (mm x mm) |
| CA-IS3092W | 0.5 | 5 | SOIC16-WB | 10.3 x 7.5 |
| CA-IS3092VW | 0.5 | 5 | SOIC16-WB | 10.3 x 7.5 |
| CA-IS2092W | 0.5 | 2.5 | SOIC16-WB | 10.3 x 7.5 |
| CA-IS2092VW | 0.5 | 2.5 | SOIC16-WB | 10.3 x 7.5 |
| CA-IS3098W | 20 | 5 | SOIC16-WB | 10.3 x 7.5 |
| CA-IS3098VW | 20 | 5 | SOIC16-WB | 10.3 x 7.5 |
| CA-IS2092A | 0.5 | 2.5 | LGA | 5.2 x 4.65 |
Optimized CA-IS2092A Transceiver PCB Design and Layout
The CA-IS2092A is ultra-small, complete galvanically-isolated RS-485/RS-422 transceiver. An integrated DC-DC converter generates a 3.3V or 5V operating voltage for the cable-side and can deliver up to 100mA of load current. This device includes an integrated micro-transformer. The internal DC-DC converter operates up to 25MHz switching frequency because of the smaller transformer-size and power transmission limitation.
The high di/dt and dv/dt resulting from the high-frequency switching operation of the on-chip transformer can generate electromagnetic interference in the range of 30MHz to 1GHz. This application note provides procedures and design tips for minimizing the EMI interference and maximizing the performance of CA-IS2092A based design. A reference design is provided as a PCB layout example that passed the test according to EN55032 Class-B standard for the CA-IS2092A.
CA-IS2092A LGA16 transceiver pin configuration
Note: Pin 10 is the RS-485 cable side power supply input. Connect VISOIN and VISOOUT together on the PCB.
In summary, the CA-IS2092A transceivers offer a compact and robust solution for isolated RS-485/RS-422 communication, with integrated DC-DC conversion and high galvanic isolation. These devices are minimal EMI, supporting high-density applications across various sectors. And they are available in a space-saving LGA16 package, making them an ideal choice for modern, efficient, and reliable industrial designs.
About Manufacturer Chipanalog
Shanghai Chipanalog Microelectronics Co., Ltd. is a high-tech company focusing on R&D, design and sales of high-end analog chips. The product portfolio involves Isolation, Interfaces, HPA, Driver and Power, which finds application in industrial and automotive electronics markets.
Founded in 2016, Chipanalog Microelectronics has become a well-known domestic supplier in the field of high-end analog chips after several years of development. Chipanalog has collaborated with over 3,000 customers across a range of industries, including industrial control, power supplies and energy, household appliances, and automobile electronics.
LCSC Electronics is the distributor of Chipanalog. Our intelligent warehouse spans 130,000+ square meters. With 2,600+ brand suppliers and 500,000+ spot SKUs, we offer a wide selection of electronic components in stock for immediate shipment. We have over four million registered users worldwide, and on average, we receive 14,000+ daily orders on working days. LCSC provides electronic components in design and production quantities, making it an ideal resource for design engineers and buyers. View and select Chipanalog’s isolated RS-485/422 transceiver products at LCSC Electronics.
