CY7C65217A-24LTXI - USB 2.0 Serial Bridge | Infineon
MPN: CY7C65217A-24LTXI ✓ ActiveCY7C65217A-24LTXI Overview
A USB serial bridge is an interface controller that allows a host computer to communicate with UART, I2C, SPI, or general-purpose I/O peripherals through USB. These controllers combine USB device logic with embedded serial interfaces and configuration logic. Within the broader semiconductor hierarchy, the CY7C65217A-24LTXI belongs to the USB interface controller and bridge-controller class of interface ICs rather than to a general-purpose microcontroller or transceiver.
The manufacturer's product information identifies USB 2.0 connectivity and support for USB-to-UART, USB-to-I2C, and USB-to-SPI bridging. It also identifies low-power operation as a defining feature of the EZ-USB serial bridge family. GPIO support allows the same controller to handle discrete control or status signals alongside its principal serial interface, reducing the need for separate interface components in compact designs.
The 24-QFN construction supports dense PCB layouts while providing separate connections for USB and the embedded serial peripherals. USB bus-routing practices remain important because differential USB signals should be routed as a controlled impedance pair on a multilayer board. Short trace lengths, continuous reference planes, and careful placement of the USB interface components help maintain signal integrity in compact implementations.
Typical uses include a USB-to-UART cable or adapter, an industrial instrument that exposes a legacy serial port to a modern host, an I2C sensor hub connected through USB, and an SPI peripheral interface in a compact control enclosure. In each case, the controller replaces separate host-interface adapters when the design needs multiple serial functions and compact board area.
Design decisions should begin with the exact interface requirements of the target peripheral. Confirm which protocol will be used on each side, verify voltage compatibility, and follow the manufacturer's pin and reference-circuit guidance before assigning signals. A common pitfall is treating the A-suffix ordering code as interchangeable with every member of the CY7C65216 and CY7C65217 families without checking electrical limits and peripheral configuration.
This product page consolidates the exact interface, package, and ordering information available from the manufacturer and distributor records, while separating true drop-in candidates from related family members. It also provides application-oriented guidance, a focused comparison table, and design notes that help engineers evaluate the controller before committing a 4 x 4 mm QFN layout to production.
Drop-in alternatives for CY7C65217A-24LTXI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CY7C65217A-24LTXI (same form factor and footprint) — differing in Maximum USB Data Rate, Product Type.
CY7C65217-24LTXI
✅ Drop-InContact for price
View Datasheet →CY7C65217A-24LTXI Specifications
| Product Type | EZ-USB serial bridge controller |
| USB Version | USB 2.0 |
| Supported Serial Interfaces | UART, I2C, and SPI |
| Additional Interface Support | GPIO |
| Power Class | Low-power |
| Package | 24-QFN (4 x 4 mm) |
| Mounting Type | Surface mount |
| Pin Count | 24 pins |
| Maximum USB Data Rate | 12 Mbit/s |
CY7C65217A-24LTXI 24-qfn (4 x 4 mm) Pin Configuration Guide
Pin configuration for CY7C65217A-24LTXI (24-qfn (4 x 4 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for CY7C65217A-24LTXI.
Refer to the datasheet for full pin configuration.
Typical Applications
CY7C65217A-24LTXI is suitable for 6 applications: USB-to-UART Serial Adapter, USB-Connected I2C Sensor Hub, USB-to-SPI Peripheral Interface, Industrial Control and Diagnostics, Legacy Equipment USB Conversion, Embedded USB HMI Interface.
USB-to-UART Serial Adapter
The CY7C65217A-24LTXI is appropriate for a compact adapter that gives a modern USB host access to a UART peripheral. Its documented UART bridging capability eliminates the need for a separate USB-to-UART converter when the product also needs I2C or SPI connectivity. The 24-QFN, 4 x 4 mm package helps reduce connector-board area. During implementation, confirm the peripheral voltage levels, supported baud rate, transmit and receive framing, and the required USB enumeration behavior. The same controller can then expose the serial endpoint through a standard host interface while retaining the embedded system’s UART wiring and firmware model.
Recommended
USB-Connected I2C Sensor Hub
The CY7C65217A-24LTXI can bridge I2C sensors or configuration devices to a USB 2.0 host, making it suitable for compact measurement instruments and data-acquisition equipment. Infineon identifies USB-to-I2C support as a core function of the controller. Its integration of several serial interfaces in a 4 x 4 mm 24-QFN package leaves more board area for the sensor circuitry and connectors. Designers should verify address capacity, bus voltage, pull-up requirements, supported transfer rate, and the pin multiplexing required by the target device. USB power and ground return paths also need careful layout to prevent peripheral bus operation from becoming sensitive to cable or connector noise.
Recommended
USB-to-SPI Peripheral Interface
The CY7C65217A-24LTXI is suitable for placing an SPI peripheral behind a USB connection in an industrial controller, test instrument, or compact service interface. The manufacturer identifies USB-to-SPI bridging, allowing firmware on the USB host to communicate with a target device without implementing a separate external USB-to-SPI adapter. The 24-QFN package supports compact placement close to the serial peripheral. Before layout is released, compare the controller’s electrical limits with the peripheral’s supply voltage, clock rate, signal polarity, and chip-select expectations. Firmware must also match the supported command and data phase behavior of the bridge function used by the product.
Recommended
Industrial Control and Diagnostics
The CY7C65217A-24LTXI can provide a maintenance or configuration connection for an industrial control assembly that combines UART diagnostics with I2C or SPI sensors. Its low-power EZ-USB design is appropriate for compact embedded equipment, while USB 2.0 provides a common connection to service laptops and test systems. The 24-QFN, 4 x 4 mm package reduces the footprint required for the bridge section. A robust implementation should include defined ESD protection, controlled connector grounding, stable supply decoupling, and firmware isolation between command channels. The selected protocol, baud rate, or clock configuration should be validated at the system level so that peripheral traffic cannot interfere with maintenance traffic.
Recommended
Legacy Equipment USB Conversion
The CY7C65217A-24LTXI is useful when modernizing equipment that retains UART, I2C, or SPI internal interfaces but needs a USB-facing service port. Instead of replacing the complete embedded controller, a design can place the bridge beside the existing serial circuitry and present a standard USB connection externally. This approach suits instrumentation, laboratory products, and legacy peripheral boards. The implementation must preserve the original signal voltage and protocol timing, while the USB connector and cable path require careful signal-integrity and ESD design. Because the package is only 4 x 4 mm, thermal performance and exposed-pad grounding should also be reviewed against the system’s available copper area.
Recommended
Embedded USB HMI Interface
The CY7C65217A-24LTXI can serve as the USB-facing interface for a compact human-machine interface that connects buttons, displays, or control peripherals through UART, I2C, SPI, or GPIO. Infineon identifies GPIO support in addition to the principal serial bridges, allowing several low-speed functions to coexist around one controller. The small 24-QFN footprint is useful in panel-mounted and portable products where connector placement constrains board area. Designers should assign pins only after checking the exact multiplexing matrix and use the manufacturer reference circuit for bypassing and configuration components. Host software must also handle enumeration and peripheral addressing consistently so that control commands reach the intended device.
Recommended
Recommended Products Summary
Engineering reference data for CY7C65217A-24LTXI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CY7C65217-24LTXI |
|---|---|---|
| Brand | Infineon | Infineon |
| Package | 24-QFN (4 x 4 mm) | 24-QFN (4 x 4 mm) - same package |
| Product Type | Low-power EZ-USB serial bridge controller | EZ-USB serial bridge controller |
| USB Version | USB 2.0 | USB 2.0 |
| UART Support | Supported | Supported |
| I2C Support | Supported | Supported |
| SPI Support | Supported | Supported |
| Maximum USB Data Rate | 12 Mbit/s | 12 Mbit/s |
| Ordering Suffix | A-24LTXI | 24LTXI without A suffix |
Key Differentiators
- Combines three principal embedded serial bridges in one controller (vs CY7C65216-24LTXI)
- Compact 4 x 4 mm integration for multi-interface products (vs CY7C65216-24LTXI)
- USB 2.0 operation with a 12 Mbit/s listed data rate (vs CY7C65217-24LTXI)
Design Notes
Route the USB differential pair as a short, impedance-controlled pair on a continuous reference plane. Place the controller and required USB passives near the connector, avoid stubs and test-point structures on the pair, and maintain the spacing defined by the board’s USB impedance stack-up. The 24-QFN footprint also requires careful escape routing so USB and serial signals can reach their pins without forcing abrupt or highly coupled paths.
Use the manufacturer’s reference circuit and pin table as the authority for bypass capacitors, configuration resistors, clock components, and exposed-pad connections. Place required decoupling directly beside the corresponding power and ground pins, and connect the exposed thermal pad to the required ground-copper structure. Verify the final land pattern against the 24-QFN mechanical drawing rather than relying only on a generic QFN footprint.
Do not treat the shared 24-QFN package as proof that every CY7C65216 or CY7C65217 ordering code is interchangeable. The CY7C65216-24LTXI is documented as a single-channel I2C bridge, while the CY7C65217 family supports UART, I2C, and SPI bridging. Check protocol coverage, voltage levels, pin multiplexing, peripheral configuration, and firmware behavior for the exact MPN before approving a substitution.
Keep I2C and SPI routing away from the USB differential pair where practical, and provide pull-ups or termination only where required by the selected interface and topology. Route UART signals as controlled, non-crosstalk paths, particularly when long cable transitions are present. Use a continuous ground reference beneath serial signals and test the assembled board with the intended cable, connector, enclosure, and peripheral load.
Compliance Information
The cited manufacturer and distributor records do not state the compliance status of the exact ordering code. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status from the current Infineon product documentation.