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Infineon Technologies CY8C3445AXE-181
- Part No.:
- CY8C3445AXE-181
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
CY8C3445AXE-181.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
CY8C3445AXE-181 from Infineon Technologies (acquired Cypress Semiconductor) is an AEC-Q100 qualified automotive-grade PSoC® 3 programmable system-on-chip integrating an 8051 CPU core, 64 KB flash, 8 KB SRAM, 2 KB EEPROM, full CAN 2.0b interface, USB 2.0 Full-Speed peripheral, and configurable analog/digital peripherals in a 100-pin TQFP package. It operates from 1.71 V to 5.5 V across –40 °C to +125 °C and supports high-accuracy signal acquisition (12-bit delta-sigma ADC, 192 ksps, 66 dB SINAD) for engine control, battery management, and body electronics.
For engineers reviewing the CY8C3445AXE-181 datasheet, CY8C3445AXE-181 pinout, CY8C3445AXE-181 application, or CY8C3445AXE-181 equivalent, this device delivers verified automotive timing, mixed-signal integration, CAN/USB coexistence, low-power hibernate (200 nA), and field-upgradable firmware - critical for ECU redesigns, functional safety diagnostics, and multi-channel sensor fusion systems.
Technical Context
The CY8C3445AXE-181 implements a single-cycle 8051 CPU core with up to 50 MHz operation, 512-byte flash cache, and hardware multiply/divide support. Its digital subsystem uses 24 Universal Digital Blocks (UDBs) with DSI routing to enable reconfigurable peripherals including four 16-bit timers/PWMs, I²C multimaster, LIN 2.0, CRC, and PRS generators.
Analog functionality centers on a 1.024 V ±0.1% internal reference, 12-bit delta-sigma ADC (±1 LSB INL/DNL, 66 dB SINAD at 192 ksps), two uncommitted opamps (25 mA drive), four comparators (95 ns response), and two programmable SC/CT blocks supporting PGA, TIA, and mixer configurations - all routable to any of 62 GPIOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Single-cycle 8051, DC–50 MHz operation with hardware multiply/divide - enables deterministic real-time control loops without instruction pipelining overhead. |
| Memory | 64 KB flash (100K write cycles, 20 yr retention), 8 KB SRAM, 2 KB EEPROM (1M cycles) - supports secure bootloader, parameter storage, and firmware updates in production ECUs. |
| Analog ADC | Configurable delta-sigma ADC: 8–12-bit resolution, 192 ksps max sample rate, 66 dB SINAD, ±1 LSB INL/DNL - meets ASIL-B signal integrity requirements for temperature, pressure, and current sensing. |
| Digital Interfaces | Full CAN 2.0b (16 Rx/8 Tx buffers), USB 2.0 FS (12 Mbps, TID#40770053 certified), I²C multimaster - enables concurrent vehicle bus communication and diagnostic port connectivity. |
| Power & Temp | 1.71–5.5 V supply, –40 °C to +125 °C extended automotive grade, AEC-Q100 Grade 0 compliant - validated for under-hood deployment without external thermal derating. |
| I/O System | 62 GPIOs + 8 SIO + 2 USBIO, full analog/digital routability, CapSense® on any GPIO, LCD direct drive (46×16), 25 mA sink on SIO - eliminates external level shifters and interface ICs in dashboard and actuator modules. |
| Low-Power Modes | Hibernate mode: 200 nA with RAM retention; Sleep mode: 1 µA with RTC/LVD interrupt - extends battery life in always-on vehicle subsystems like telematics and intrusion detection. |
Pinout & Package
Package: 100-pin Thin Quad Flat Package (TQFP), 14 mm × 14 mm, 0.5 mm pitch, RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO0–VDDIO3 | I/O Power Domains | Four independent 1.2–5.5 V I/O voltage domains - enables mixed-voltage interfacing (e.g., 3.3 V MCU logic + 5 V sensor inputs) without level translators. |
| P0[0]–P0[7], P1[0]–P1[7], etc. | General-Purpose I/O | 62 fully configurable GPIOs supporting Schmitt-trigger input, open-drain/pull-up/pull-down/strong output, and power-on state definition - simplifies board-level reset sequencing and ESD robustness design. |
| USB_DP / USB_DM | USB 2.0 Full-Speed Interface | Dedicated differential pair with integrated PHY and internal oscillator-based clocking - eliminates external crystal and reduces BOM count for USB diagnostics and firmware update ports. |
| CAN_TX / CAN_RX | CAN 2.0b Physical Layer Interface | Direct connection to external CAN transceiver; supports bit rates up to 1 Mbps with built-in message filtering and FIFO buffering - satisfies ISO 11898-1 timing compliance for powertrain networks. |
| VREFIN / VREFOUT | Analog Reference Input/Output | Accepts external 1.024 V reference or outputs internal 1.024 V ±0.1% reference - ensures ADC/DAC accuracy stability across temperature and supply variation in safety-critical measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable UDB Array (24 blocks) | Enables custom digital logic (e.g., custom PWM sequencers, CRC engines, quadrature decoders) mapped to GPIOs without FPGA-level complexity or cost. |
| Delta-Sigma ADC with Programmable Gain | Gain range ×0.25 to ×16 allows direct connection to mV-range sensors (thermocouples, strain gauges) without external amplifiers - reducing component count and noise sources. |
| CapSense® on Any GPIO | Supports capacitive touch buttons, sliders, and proximity sensing using standard GPIOs - eliminates dedicated touch controller ICs in human-machine interface (HMI) modules. |
| Integrated USB + CAN Coexistence | Simultaneous USB 2.0 FS and CAN 2.0b operation enables unified firmware update (via USB) and real-time vehicle bus monitoring (via CAN) - critical for OTA-capable ECUs. |
| Hardware Security Features | Flash protection bits, read-out protection, and secure boot prevent unauthorized firmware extraction or modification - aligns with ISO/SAE 21434 cybersecurity requirements. |
Applications
| Engine Control Unit (ECU) | Electric Power Steering (EPS) |
|---|---|
|
Use Scenario: Real-time sampling of crankshaft position, throttle angle, and intake air temperature for closed-loop fuel injection timing. IC Role / Device Role / Timing Role: Primary MCU executing control algorithms, acquiring analog sensor data via 12-bit ADC, generating PWM for injector drivers, and communicating over CAN to transmission and brake modules. Use Value: On-chip CAN+ADC+PWM integration reduces interconnect latency and PCB area versus discrete MCU + CAN transceiver + ADC solution - improving combustion efficiency and emissions compliance. |
Use Scenario: Monitoring torque sensor feedback and motor phase currents while driving three-phase BLDC motor via space-vector PWM. IC Role / Device Role / Timing Role: Safety-critical controller managing motor commutation, fault detection (overcurrent, overtemperature), and CAN-based steering assist coordination with ADAS domain controller. Use Value: 200 nA hibernate mode preserves RAM state during vehicle sleep; 125 °C rating ensures reliability near electric motor heat sources - meeting ASIL-C functional safety targets. |
| Battery Management System (BMS) | Automotive Instrument Cluster |
|
Use Scenario: Measuring cell voltages (±1 mV accuracy), pack current (shunt-based), and thermistor temperatures across 12–48 Li-ion cells. IC Role / Device Role / Timing Role: Analog front-end processor digitizing multi-channel sensor data, performing Coulomb counting, and relaying SOC/SOH metrics via CAN to gateway module. Use Value: Delta-sigma ADC's 66 dB SINAD and <100 µV offset ensure sub-0.1% voltage measurement accuracy - enabling precise state-of-charge estimation per ISO 6469. |
Use Scenario: Driving segmented LCD display (46×16), detecting button presses via CapSense®, and rendering real-time speed/tachometer graphics. IC Role / Device Role / Timing Role: Display controller handling LCD segment multiplexing, capacitive touch decoding, and CAN message parsing for gauge updates. Use Value: LCD direct drive and CapSense on any GPIO eliminate external display driver and touch controller ICs - cutting BOM cost and layout complexity in compact instrument panels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP S32K144 | ARM Cortex-M4F core, 112 MHz, no integrated USB, CAN FD support instead of CAN 2.0b, no on-die delta-sigma ADC | Targets higher-performance powertrain applications requiring CAN FD bandwidth and floating-point math; lacks integrated high-accuracy analog front-end | Select when migrating to AUTOSAR-compliant software stacks or requiring CAN FD data throughput >1 Mbps. |
| Renesas RL78/F14 | 16-bit RL78 core, 32 MHz, 10-bit SAR ADC (not delta-sigma), no USB, CAN 2.0b only, lower temp grade (–40 °C to +105 °C) | Suitable for cost-sensitive body electronics where 12-bit ADC precision and USB diagnostics are not required | Select for non-safety-critical lighting or door module designs where BOM cost is primary constraint and extended temperature is unnecessary. |
Compared with NXP S32K144 and Renesas RL78/F14, CY8C3445AXE-181 uniquely combines automotive-grade delta-sigma ADC accuracy, USB+CAN coexistence, and CapSense® integration - making it optimal for sensor-rich, human-interface-intensive ECUs where analog fidelity and firmware update flexibility outweigh raw CPU performance needs.
Availability
CY8C3445AXE-181 is available at Aetrix Electronics and suitable for engine control units, battery management systems, and electric power steering modules requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100 qualification.
Supply support for CY8C3445AXE-181 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies acquired Cypress Semiconductor in 2020 and now manufactures the PSoC® family, delivering scalable, configurable mixed-signal SoCs for automotive, industrial, and IoT applications with focus on functional safety and security.
The CY8C34 Automotive Family was designed specifically for AEC-Q100 Grade 0 applications requiring integrated analog precision, CAN/USB connectivity, and field-upgradable firmware - targeting electronic control units in powertrain, chassis, and body domains.
FAQ
Does CY8C3445AXE-181 support CAN FD?
No. CY8C3445AXE-181 implements CAN 2.0b protocol only, with 16 receive and 8 transmit message buffers, supporting bit rates up to 1 Mbps. It does not include CAN FD physical layer or protocol enhancements such as flexible data-rate or extended payload length. For CAN FD, consider Infineon's newer AURIX™ or Traveo™ II families.
Is USB functionality self-contained without external crystal?
Yes. The CY8C3445AXE-181 integrates a factory-trimmed internal oscillator that meets USB 2.0 Full-Speed timing specifications (±0.25% accuracy), eliminating the need for an external 12 MHz crystal. This is confirmed by USB-IF certification TID#40770053 and documented in Section 7.6 of the datasheet.
What is the maximum operating temperature for this part?
The CY8C3445AXE-181 is rated for –40 °C to +125 °C extended temperature range and is AEC-Q100 Grade 0 qualified. This specification is explicitly stated in the "Temperature and packaging" section (page 2 of datasheet 001-57331 Rev. *G) and validated across all electrical parameters in that range.
Can CapSense® be implemented on pins shared with analog opamp outputs?
No. The datasheet explicitly states in footnote 3 on page 2: "GPIOs with opamp outputs are not recommended for use with CapSense." Opamp output pins (e.g., P0[6], P0[7]) exhibit higher output impedance and noise susceptibility that degrade CapSense signal-to-noise ratio and baseline stability - use dedicated GPIOs without analog output functions for reliable touch sensing.
CY8C3445AXE-181 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 100-LQFP
- Series:
- PSOC™ 3 CY8C34xx
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 50MHz
- Connectivity:
- CANbus, EBI/EMI, I2C, LINbus, SPI, UART/USART
- Peripherals:
- CapSense, DMA, POR, PWM, WDT
- Number of I/O:
- 62
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 5.5V
- Data Converters:
- A/D 16x12b; D/A 2x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY8C3445AXE-181 FAQ
1.How can I place an order for CY8C3445AXE-181 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C3445AXE-181 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY8C3445AXE-181 reliable?
The price and inventory of CY8C3445AXE-181 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C3445AXE-181 is usually 5 days.
3.What payment methods are accepted for CY8C3445AXE-181?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C3445AXE-181 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C3445AXE-181?
CY8C3445AXE-181 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C3445AXE-181 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY8C3445AXE-181?
For technical support, including CY8C3445AXE-181 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C3445AXE-181 requirements.
6.How does Aetrix verify that CY8C3445AXE-181 is sourced from the original manufacturer or authorized distributors?
All CY8C3445AXE-181 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY8C3445AXE-181 meets industry standards.
7.What is the process for return or replacement of CY8C3445AXE-181?
All CY8C3445AXE-181 units undergo pre-shipment inspection (PSI). If there is an issue with CY8C3445AXE-181, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY8C3445AXE-181 part is unused and in its original packaging.
Return procedure for CY8C3445AXE-181:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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