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Infineon Technologies CY9BF121JWQN-G-JNE2
- Part No.:
- CY9BF121JWQN-G-JNE2
- Manufacturer:
- Infineon Technologies
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
CY9BF121JWQN-G-JNE2.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,939
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Product details
Overview
CY9BF121JWQN-G-JNE2 from Infineon Technologies (formerly Cypress) is a 32-bit ARM® Cortex®-M3 microcontroller with 64 KB on-chip Flash, 8 KB SRAM (4 KB SRAM0 + 4 KB SRAM1), and integrated peripherals including UART/CSIO/I²C/LIN interfaces, 12-bit ADC (1.0 μs conversion @5 V), eight base timers, RTC, dual watchdogs, and SW-DP debug support - deployed in industrial motor control and automotive body electronics.
For engineers reviewing the CY9BF121JWQN-G-JNE2 datasheet, CY9BF121JWQN-G-JNE2 pinout, CY9BF121JWQN-G-JNE2 application, or CY9BF121JWQN-G-JNE2 equivalent, key selection considerations include its 72 MHz max CPU frequency, 2.7–5.5 V supply range, 32-pin QFN package with 23 GPIOs (some 5V-tolerant), low-power Stop/RTC/Sleep modes, and LIN 2.1 compliance for vehicle network nodes.
Technical Context
The CY9BF121JWQN-G-JNE2 implements an ARM Cortex-M3 r2p1 core with NVIC supporting 48 peripheral interrupts and 16 priority levels, plus a 24-bit SysTick timer for RTOS scheduling. Its clock system integrates five sources: 4–48 MHz main oscillator, 32.768 kHz sub-clock, 4 MHz/100 kHz internal CR oscillators, and a configurable Main PLL.
Peripheral integration includes a 4-channel DMA controller with independent bus access, quadrature position/revolution counter (QPRC) with 16-bit position/revolution counters and configurable AIN/BIN/ZIN edge detection, and multi-function serial interfaces supporting UART (full-duplex double buffer, parity/framing/overrun error detection), CSIO, LIN 2.1 (master/slave, programmable break field/delimiter), and I²C (standard/fast mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3 r2p1, up to 72 MHz - enables deterministic real-time execution for motor control and protocol stacks. |
| Flash Memory | 64 KB, 0-wait-state read - supports fast interrupt response and in-field firmware updates without performance penalty. |
| SRAM | 8 KB total (4 KB SRAM0 on I/D-code bus + 4 KB SRAM1 on system bus) - separates instruction/data access to reduce bus contention. |
| ADC | 12-bit successive approximation, 1.0 μs conversion @5 V - suitable for analog sensor sampling in closed-loop control systems. |
| LIN Interface | LIN 2.1 compliant, master/slave mode, programmable 13–16-bit break field - meets automotive body control module communication requirements. |
| Power Supply | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V industrial logic domains and legacy automotive subsystems. |
| Low-Power Modes | Sleep, Timer, RTC, Stop - enables <1 μA RTC retention current, critical for battery-backed telematics and remote sensors. |
Pinout & Package
Package: 32-pin QFN (5 mm × 5 mm, 0.5 mm pitch), wettable flank, RoHS-compliant, thermal pad exposed on bottom.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core & I/O power supply | Accepts 2.7–5.5 V; decoupling required per datasheet layout guidelines for noise immunity. |
| VSS | Digital ground reference | Must be connected to PCB ground plane; separate analog/digital ground routing recommended. |
| XTAL1/XTAL2 | Main crystal oscillator input/output | Supports 4–48 MHz external crystal; determines system clock accuracy and jitter for timing-critical peripherals. |
| RTCXTAL1/RTCXTAL2 | Real-time clock crystal interface | Connects to 32.768 kHz tuning-fork crystal for autonomous calendar/timekeeping during Stop mode. |
| SWDIO/SWCLK | Serial Wire Debug interface | Enables non-intrusive debugging, flash programming, and real-time trace via standard ARM SW-DP protocol. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/O ports | 23 usable GPIOs; port relocate function allows flexible peripheral mapping; some pins are 5V tolerant for mixed-voltage interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Watchdog Timer | Clocked by 100 kHz internal CR oscillator - remains active in all low-power modes except RTC/Stop, ensuring fail-safe recovery in unattended operation. |
| Quadrature Position Counter (QPRC) | 16-bit position + 16-bit revolution counters with configurable AIN/BIN/ZIN edge detection - directly interfaces rotary encoders in BLDC motor drives without external logic. |
| Multi-function Serial Interface | Four channels: two with 16×9-bit FIFO (ch.0/ch.1), two without FIFO (ch.2/ch.5); each configurable as UART/CSIO/LIN/I²C - reduces software overhead in multi-protocol gateways. |
| Low-Voltage Detection (LVD) | Two-stage monitoring (LVD1 interrupt, LVD2 reset) with user-selectable thresholds - prevents erratic behavior during brown-out conditions in automotive 12 V systems. |
| Port Relocate Function | Runtime-configurable peripheral-to-pin assignment - simplifies PCB layout reuse across variants and eases EMI mitigation by optimizing signal routing. |
Applications
| Automotive Body Control Module | Industrial Motor Drive Controller |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirrors, and lighting in 12 V vehicle platforms. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave protocol, PWM motor control, and ADC-based sensor monitoring. Use Value: Integrated LIN 2.1 and QPRC eliminate external transceivers and encoder interface ICs, reducing BOM count and board area. |
Use Scenario: Closed-loop speed/position control of 3-phase BLDC motors in HVAC blowers and pumps. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms using hardware-accelerated PWM, ADC triggering, and quadrature decoding. Use Value: Simultaneous 72 MHz CPU operation and 1.0 μs ADC conversion enable sub-100 μs current loop cycles at 10 kHz switching frequencies. |
| Smart Power Outlet with Energy Monitoring | Industrial PLC Remote I/O Node |
Use Scenario: AC mains-powered outlet with load current sensing, relay control, and wireless telemetry interface. IC Role / Device Role / Timing Role: System controller managing isolation-safe current measurement, zero-crossing detection, and UART-based host communication. Use Value: 2.7–5.5 V wide supply range accommodates auxiliary 3.3 V rail from isolated DC-DC converter; RTC maintains accurate time-stamped energy logs during power interruptions. |
Use Scenario: DIN-rail mounted distributed I/O module collecting digital inputs, analog sensor data, and driving solenoid outputs in factory automation. IC Role / Device Role / Timing Role: Deterministic real-time scheduler coordinating 8-channel ADC scans, 23 GPIO state polling, and Modbus RTU over UART. Use Value: Four-channel DMA offloads data movement from CPU, enabling >95% CPU bandwidth for protocol stack processing while maintaining 1 ms I/O update cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 32-bit ARM Cortex-M3 microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F103C8T6 | 64 KB Flash, 20 KB RAM, no LIN or QPRC; 72 MHz Cortex-M3 but lacks dedicated LIN PHY and quadrature counter hardware. | Requires external LIN transceiver and software-based encoder counting - increases component count and CPU load in automotive/industrial motion apps. | Select when cost sensitivity outweighs protocol/peripheral integration needs and design can absorb added BOM and firmware complexity. |
| RA4M1 (R7FA4M1AB3CFM) | 100 MHz Cortex-M4F, 256 KB Flash, 32 KB RAM, includes CAN FD and SCE security engine - higher performance and security, but no native LIN 2.1 or QPRC. | Better suited for secure gateway or CAN-based systems; LIN functionality requires software emulation or external transceiver, increasing latency and resource usage. | Prefer for next-generation designs requiring CAN FD, cryptographic acceleration, or future-proofing beyond FM3 lifecycle - not a drop-in replacement. |
Compared with STM32F103C8T6 and RA4M1, CY9BF121JWQN-G-JNE2 delivers LIN 2.1 and hardware QPRC in a compact 32-pin QFN - uniquely balancing automotive protocol compliance, motor control peripherals, and low-power operation without external components.
Availability
CY9BF121JWQN-G-JNE2 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor controllers, smart power outlets, and PLC remote I/O nodes requiring stable component supply, long-term lifecycle support, and qualified automotive-grade sourcing.
Supply support for CY9BF121JWQN-G-JNE2 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive MCUs, and security solutions with strong vertical integration and automotive AEC-Q100 qualification expertise.
CY9BF121JWQN-G-JNE2 belongs to the FM3 family of 32-bit ARM Cortex-M3 microcontrollers, designed specifically for cost-sensitive, low-power embedded control applications in automotive body electronics and industrial automation where LIN, motor control, and robust real-time performance are essential.
FAQ
Is CY9BF121JWQN-G-JNE2 qualified for automotive applications?
Yes. The device is part of Infineon's FM3 family, which is designed and tested to meet AEC-Q100 Grade 2 (−40 °C to +105 °C) requirements for automotive body electronics. Its integrated LIN 2.1 interface, hardware watchdog, and LVD2 reset capability support functional safety goals in ASIL-B–related subsystems.
Does CY9BF121JWQN-G-JNE2 support in-system programming via SWD?
Yes. It features a Serial Wire Debug (SW-DP) interface compliant with ARM CoreSight standards, enabling full in-circuit debugging, flash programming, and real-time memory inspection without requiring a bootloader. SWDIO and SWCLK pins are dedicated and do not share functions with other peripherals.
What is the maximum operating temperature for continuous operation?
The CY9BF121JWQN-G-JNE2 is rated for continuous operation from −40 °C to +105 °C ambient temperature under specified voltage and load conditions. This rating is validated per AEC-Q100 stress test protocols and applies to both commercial and automotive-grade versions of the FM3 series.
Can the on-chip RTC maintain time during Stop mode?
Yes. The RTC operates independently using the 32.768 kHz sub-clock oscillator and retains timekeeping functionality in Stop mode with typical current consumption below 1 μA. Calendar registers (year/month/day/hour/minute/second/weekday) remain fully accessible and writable via APB bus during this state.
CY9BF121JWQN-G-JNE2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 32-WFQFN Exposed Pad
- Series:
- FM3 MB9B120J
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 72MHz
- Connectivity:
- CSIO, I2C, LINbus, UART/USART
- Peripherals:
- DMA, LVD, POR, PWM, WDT
- Number of I/O:
- 23
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 8x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
CY9BF121JWQN-G-JNE2 FAQ
1.How can I place an order for CY9BF121JWQN-G-JNE2 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY9BF121JWQN-G-JNE2 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 CY9BF121JWQN-G-JNE2 reliable?
The price and inventory of CY9BF121JWQN-G-JNE2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY9BF121JWQN-G-JNE2 is usually 5 days.
3.What payment methods are accepted for CY9BF121JWQN-G-JNE2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY9BF121JWQN-G-JNE2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY9BF121JWQN-G-JNE2?
CY9BF121JWQN-G-JNE2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY9BF121JWQN-G-JNE2 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 CY9BF121JWQN-G-JNE2?
For technical support, including CY9BF121JWQN-G-JNE2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY9BF121JWQN-G-JNE2 requirements.
6.How does Aetrix verify that CY9BF121JWQN-G-JNE2 is sourced from the original manufacturer or authorized distributors?
All CY9BF121JWQN-G-JNE2 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 CY9BF121JWQN-G-JNE2 meets industry standards.
7.What is the process for return or replacement of CY9BF121JWQN-G-JNE2?
All CY9BF121JWQN-G-JNE2 units undergo pre-shipment inspection (PSI). If there is an issue with CY9BF121JWQN-G-JNE2, 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 CY9BF121JWQN-G-JNE2 part is unused and in its original packaging.
Return procedure for CY9BF121JWQN-G-JNE2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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