DS90UB935TRHBRQ1 TI Automotive FPD-Link III Serializer 3Gbps CSI-2 Interface Power-over-Coax VQFN-32

DS90UB935TRHBRQ1 Product Overview

The DS90UB935-Q1 is a Texas Instruments (TI) FPD-Link III serializer designed for high-speed raw data sensors in automotive applications, including cameras, satellite radar, LiDAR, and Time-of-Flight (ToF) sensors. The device supports transmission over a single coaxial (PoC) or shielded twisted‑pair (STP) cable, delivering a high-speed forward channel up to 3Gbps and an ultra-low latency bidirectional control channel. Fully AEC-Q100 Grade 2 qualified with an operating temperature range of -40℃ to +105℃, the DS90UB935-Q1 comes in a compact 5×5mm VQFN-32 package and is widely used in automotive ADAS and autonomous driving systems.

DS90UB935TRHBRQ1 Core Features

The DS90UB935-Q1 serializer is compliant with D-PHY v1.2 and CSI-2 v1.3 standards, supporting up to 2.528Gbps CSI-2 bandwidth and up to 4 virtual channels. It supports single‑ended coaxial (PoC‑capable) or STP cables, simplifying system wiring and reducing weight. Powered by a single 1.8V supply, the device consumes only 0.28W typical, ideal for power‑sensitive embedded sensor modules.

The chip integrates advanced data protection and diagnostic features, including CRC data protection, sensor data integrity check, I2C write protection, voltage/temperature measurement, programmable alarm, and line fault detection. An ultra‑low latency bidirectional I2C and GPIO control channel enables direct ISP control from the ECU side.

The serializer supports precision multi‑camera clocking and sensor synchronization. When paired with companion deserializers such as the DS90UB936-Q1, DS90UB954-Q1, or DS90UB960-Q1, it enables accurate multi‑camera timing alignment. It is pin‑compatible with FPD-Link IV DS90UB971-Q1 and FPD-Link III DS90UB953-Q1, DS90UB953A-Q1, and DS90UB951-Q1 serializers, facilitating product upgrades and flexible sourcing.

DS90UB935TRHBRQ1 Applications

The DS90UB935-Q1 is widely used in automotive ADAS camera modules, 360° surround view systems, dashcams, satellite radar sensors, LiDAR sensors, Time‑of‑Flight (ToF) sensors, as well as automotive infotainment systems and driver monitoring systems (DMS).

DS90UB935TRHBRQ1 Key Advantages

Fully AEC-Q100 Grade 2 qualified with an operating temperature range of -40℃ to +105℃, the DS90UB935-Q1 meets the stringent environmental demands of automotive applications. The 3Gbps high‑speed forward channel combined with an ultra‑low latency bidirectional control channel supports high‑bandwidth video data transmission and real‑time sensor control. Power‑over‑Coax (PoC) enables video data, control signals, and power to be transmitted over a single coaxial cable, significantly reducing harness weight and system cost.

The chip offers comprehensive data protection and diagnostic features, including CRC data protection, sensor data integrity checking, I2C write protection, voltage/temperature monitoring, and line fault detection, enhancing system reliability. Precision multi‑camera clock synchronization enables highly accurate multi‑camera systems when paired with companion deserializers. The compact 5×5mm VQFN package is ideal for space‑constrained sensor modules. Pin‑compatibility with multiple serializers in the same family allows customers to easily scale performance without PCB redesign, reducing hardware development costs.

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FAQ:

1. What is the DS90UB935TRHBRQ1 and what is its primary function?
   The DS90UB935 is an automotive‑qualified FPD‑Link III serializer that converts a single‑lane MIPI CSI‑2 video stream into a high‑speed serial signal for transmission over a coaxial cable or shielded twisted‑pair (STP). It is designed as the camera‑side companion chip in Advanced Driver Assistance Systems (ADAS) and surround‑view applications. The device supports Power‑over‑Coax (PoC), which allows the camera module to be powered through the same coaxial cable used for data, eliminating a separate power wire.

2. Which deserializers can I pair with the DS90UB935? Is it compatible with the DS90UB936 or DS90UB960?
   The DS90UB935 is designed to work with TI’s FPD‑Link III deserializers that accept CSI‑2 output, such as the DS90UB936 (quad deserializer hub), the DS90UB960 (quad deserializer hub), and the DS90UB954 (dual deserializer). The serializer and deserializer negotiate the link automatically, and the deserializer aggregates up to four camera streams for the host SoC. The 935 is fully interoperable with the entire 93x/96x deserializer family.

3. What MIPI CSI‑2 input capabilities does the DS90UB935 offer?
   It supports a single MIPI CSI‑2 data lane with a continuous clock rate from 400 Mbps to 832 Mbps per lane. The interface is compliant with MIPI D‑PHY v1.2 and CSI‑2 v1.3. This single‑lane configuration is ideal for 1‑ to 2‑megapixel automotive image sensors, transmitting uncompressed RAW or YUV data at up to 1080p resolution and 30 fps, or 720p at 60 fps.

4. What is Power‑over‑Coax (PoC) and how does the DS90UB935 implement it?
   PoC allows the same coaxial cable to carry both the high‑speed FPD‑Link III video data and DC power to the remote camera module. The DS90UB935 integrates the necessary PoC circuitry on‑chip, requiring only a few external passive components (inductors and capacitors) to separate the RF signal from the DC supply. This simplifies the wiring harness, reduces weight, and increases reliability in automotive camera systems.

5. What is the maximum video resolution and frame rate the DS90UB935 can handle?
   The DS90UB935 supports video streams up to 1080p at 30 fps or 720p at 60 fps, depending on the image sensor’s output format and CSI‑2 lane rate. The FPD‑Link III forward channel operates at up to 3 Gbps, providing sufficient bandwidth for these resolutions plus embedded control and diagnostics data. For higher resolutions (e.g., 4 MP), consider the dual‑lane DS90UB933 or the newer DS90UB953.

6. How does the DS90UB935 handle control and communication channels over the same cable?
   The serializer embeds bidirectional control data—including I²C, GPIO, and interrupts—into the FPD‑Link III frame alongside the video stream. This allows the host ECU to configure the image sensor, receive status signals, and trigger frame captures, all over the same coaxial cable. No additional wires are needed for control, making the system truly single‑cable.

7. What automotive qualifications and temperature range does the DS90UB935TRHBRQ1 meet?
   The device is AEC‑Q100 qualified and designed for automotive applications. It operates over an ambient temperature range of ‑40 °C to +105 °C, making it suitable for external camera modules exposed to harsh weather and engine‑bay heat. Built‑in self‑test (BIST), CRC error detection, and advanced diagnostics support functional safety goals up to ASIL‑B.

8. What are the power supply requirements and typical power consumption of the DS90UB935?
   The chip runs from a single 1.8 V supply for the core and I/O. Typical power consumption is approximately 150 mW when transmitting a full‑resolution video stream. The device’s low power dissipation and small VQFN‑32 package help camera module designers meet the stringent thermal and size constraints of modern automotive cameras.

9. How does the DS90UB935 differ from the DS90UB933 and DS90UB953? When should I choose the 935?
   The DS90UB933 also supports 1‑lane CSI‑2 but operates at a lower FPD‑Link rate (2.5 Gbps) and does not include the same level of on‑chip PoC integration. The DS90UB953 is a 2‑lane CSI‑2 serializer for higher‑resolution sensors (4 MP/8 MP). The DS90UB935 fills the sweet spot: it offers a higher FPD‑Link rate than the 933 (3 Gbps), robust on‑chip PoC, and support for 1080p cameras, all in a compact 32‑pin package. Choose the 935 for cost‑optimized 1‑ to 2‑MP camera systems that need full PoC and a 3 Gbps link.

10. What are the most typical automotive applications for the DS90UB935TRHBRQ1?
    It is used in a wide range of ADAS and surround‑view camera modules: rear‑view cameras, surround‑view cameras (SVC), forward‑facing cameras for lane‑keeping and emergency braking, driver‑monitoring cameras, and side‑mirror replacement cameras. The single‑cable PoC solution simplifies vehicle wiring and is a key enabler for scalable multi‑camera architectures in modern cars.