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Silicon Labs C8051F546-IM
- Part No.:
- C8051F546-IM
- Manufacturer:
- Silicon Labs
- Category:
- Microcontrollers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
C8051F546-IM.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
C8051F546-IM from Silicon Laboratories is an automotive-qualified 8051-based mixed-signal MCU with 8 kB Flash, 1280 B RAM, 12-bit ADC (200 ksps), two comparators, LIN 2.1 controller, and hardware UART/SMBus/SPI. It operates from 1.8–5.25 V, draws 19 mA at 50 MHz, and supports –40 to +125 °C operation in automotive body control modules.
For engineers reviewing the C8051F546-IM datasheet, C8051F546-IM pinout, C8051F546-IM application, or C8051F546-IM equivalent, this page delivers verified package mapping (24-pin QFN), LIN master/slave timing behavior, ADC conversion rate and input count, stop-mode current (1 μA), and AEC-Q100 compliance - all critical for automotive ECU design and legacy platform migration.
Technical Context
The C8051F546-IM integrates a pipelined CIP-51 core delivering 50 MIPS at 50 MHz, with on-the-fly clock source switching between internal 24 MHz oscillator (±0.5% accuracy for LIN) and external crystal/RC sources. Its analog subsystem includes a 12-bit ADC with up to 25 external single-ended inputs, programmable VREF selection, and built-in temperature sensor.
Digital peripherals include a LIN 2.1 controller (crystal-free operation), hardware-enhanced UART, SMBus, and SPI; four 16-bit timers; a 16-bit PCA with six capture/compare modules supporting PWM, frequency output, and watchdog timer modes; and 18 5 V-tolerant GPIO pins routed via priority crossbar.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | High-speed pipelined 8051 (CIP-51); executes 70% of instructions in 1–2 clocks |
| Flash / RAM | 8 kB ISP Flash (512-byte sectors); 1280 B data RAM (256 + 1024 XRAM) |
| ADC | 12-bit, 200 ksps max; 25 external SE inputs; internal VREF, ext pin, or VDD selectable |
| LIN Interface | LIN 2.1 compliant master/slave; no external crystal required; ±0.5% internal 24 MHz oscillator |
| Power Range | 1.8–5.25 V supply; 19 mA typical @ 50 MHz; 1 μA typical in stop mode |
| Temp Range | –40 to +125 °C; AEC-Q100 qualified for automotive applications |
| I/O Pins | 18 GPIO; all 5 V tolerant; configurable via priority crossbar to analog/digital peripherals |
Pinout & Package
The C8051F546-IM is housed in a 24-pin QFN package (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow the C8051F54x family layout defined in Figure 3.3 and Table 3.1 of Rev. 1.3 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Supply voltage input | Primary power rail (1.8–5.25 V); connects to bulk decoupling capacitor |
| GND | Ground reference | Analog/digital common ground; ties to thermal pad for thermal dissipation |
| P0.0–P0.7 | Port 0 I/O | 8-bit bidirectional port; mapped to UART0, SMBus, SPI, PCA, and LIN functions via crossbar |
| P1.0–P1.7 | Port 1 I/O | 8-bit bidirectional port; supports external interrupt INT0/INT1, comparator inputs, ADC inputs |
| P2.0–P2.3 | Port 2 I/O | 4-bit bidirectional port; includes LIN_TX/LIN_RX, C2 interface (debug), reset, and oscillator pins |
| XTAL1/XTAL2 | External oscillator connection | Optional 1- or 2-pin crystal/RC input; not required for LIN operation due to internal oscillator |
| C2CK / C2D | On-chip debug interface | 2-wire C2 interface for non-intrusive flash programming and full-speed debugging |
Key Features
| Feature | Design Value |
|---|---|
| LIN 2.1 Controller | Hardware-accelerated LIN master/slave with auto-baud detection and sleep/wake support - eliminates need for external LIN transceiver clocking |
| ADC with Temp Sensor | 12-bit, 200 ksps ADC with integrated temperature sensor enables system-level thermal monitoring without external components |
| Low-Power Stop Mode | 1 μA typical current draw in stop mode with wake-up via LIN, comparator, or external interrupt - extends battery life in always-on automotive nodes |
| Crossbar Routing | Priority-based digital peripheral routing allows flexible pin assignment of UART, SPI, SMBus, PCA, and LIN to any of 18 GPIOs without hardware redesign |
| AEC-Q100 Qualification | Qualified for automotive Grade 2 (–40 to +105 °C) and Grade 1 (–40 to +125 °C) per Rev. 1.3 datasheet - supports under-hood and body control applications |
Applications
| Body Control Module (BCM) | Door Module Unit |
|---|---|
Use Scenario: Centralized control of lighting, window lifts, locks, and mirrors in modern vehicle door assemblies. IC Role / Device Role / Timing Role: Primary MCU executing LIN slave firmware, managing analog sensor inputs (potentiometers, temp), and driving discrete loads via GPIO. Use Value: Integrated LIN 2.1 and 18 5 V-tolerant I/O reduce BOM count; 1 μA stop mode enables always-on wake capability from door handle sensors. | Use Scenario: Localized intelligence in vehicle doors for anti-pinch detection, position feedback, and secure lock actuation. IC Role / Device Role / Timing Role: Real-time ADC sampling of motor current and position sensors; LIN communication with BCM; PWM control of window lift motors. Use Value: 12-bit ADC (200 ksps) captures fast transients during motor stall detection; PCA-based 16-bit PWM ensures precise motor speed regulation. |
| Roof Module (Sunroof/Convertibles) | Seat Control Unit |
Use Scenario: Sunroof position tracking, obstacle detection, and seamless open/close sequencing in premium roof systems. IC Role / Device Role / Timing Role: LIN slave node coordinating with body domain; ADC monitoring of hall-effect sensors and current sense resistors. Use Value: Built-in temperature sensor validates motor thermal limits during extended operation; internal 24 MHz oscillator ensures LIN timing compliance without crystal cost or layout area. | Use Scenario: Motorized seat adjustment with memory presets, heating, and lumbar support in passenger and driver seats. IC Role / Device Role / Timing Role: Dual-role LIN node (master for seat sensors, slave for CAN gateway); ADC monitoring of heater thermistors and motor current. Use Value: 25 external ADC inputs accommodate multiple thermistors and potentiometers; 8 kB Flash supports dual-firmware storage for fail-safe rollback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal automotive MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| C8051F536-IM | Same 24-pin QFN package; 16 kB Flash; identical peripherals and AEC-Q100 rating | Higher Flash capacity supports larger diagnostic stacks or OTA update partitions | Select when firmware complexity exceeds 8 kB or future scalability is required |
| SPC560B50L5 | Power Architecture-based 32-bit MCU; 512 kB Flash; CAN FD; no integrated LIN controller | Requires external LIN transceiver; targets higher-tier ECUs with CAN backbone integration | Select when migrating to 32-bit architecture or requiring CAN FD alongside LIN |
Compared with C8051F546-IM, the C8051F536-IM offers double Flash capacity in identical footprint and qualification, while SPC560B50L5 provides 32-bit performance and CAN FD but adds BOM cost and design complexity for LIN-only nodes.
Availability
C8051F546-IM is available at Aetrix Electronics and suitable for automotive body electronics, door modules, and roof control units requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for C8051F546-IM 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
Silicon Laboratories is a fabless semiconductor company specializing in silicon timing, MCU, wireless, and sensor solutions for automotive, industrial, and IoT markets.
The C8051F54x family was designed for cost-sensitive, high-reliability automotive sub-systems requiring LIN connectivity, mixed-signal integration, and AEC-Q100 qualification - particularly in body electronics where crystal-free operation reduces bill-of-materials.
FAQ
What is the package type and pin count for the C8051F546-IM?
The C8051F546-IM uses a 24-pin QFN package (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad, as specified in Section 4.3 of the Rev. 1.3 datasheet. This matches the C8051F542/3/6/7 variant group and differs from the 32-pin QFP/QFN used by C8051F540/1/4/5 models. Pin definitions are fully documented in Table 3.1 and Figure 3.3.
Does the C8051F546-IM support LIN communication without an external crystal?
Yes, the C8051F546-IM includes an internal 24 MHz oscillator with ±0.5% accuracy over temperature and voltage, explicitly qualified for LIN 2.1 master and slave operation without requiring an external crystal. This is confirmed in Section 17.2 and Table 6.6 of the Rev. 1.3 datasheet, reducing BOM cost and PCB area in LIN-only nodes.
What is the maximum ADC sampling rate and input configuration supported by the C8051F546-IM?
The C8051F546-IM supports a maximum ADC sampling rate of 200 ksps with up to 25 external single-ended inputs. The ADC0 module allows VREF selection from on-chip reference, external pin, or VDD, and supports internal or external start-of-conversion triggers. These specifications are detailed in Section 5 and Table 6.9 of the Rev. 1.3 datasheet.
Is the C8051F546-IM qualified for automotive applications?
Yes, the C8051F546-IM is AEC-Q100 qualified for Grade 1 (–40 to +125 °C) operation and rated for automotive body electronics. Electrical characteristics across temperature, including ADC accuracy, oscillator stability, and I/O drive strength, are validated per AEC-Q100 requirements and published in Tables 6.2, 6.6, and 6.9 of the Rev. 1.3 datasheet.
What debug interface does the C8051F546-IM use, and is it compatible with standard tools?
The C8051F546-IM uses the 2-wire C2 debug interface (C2CK and C2D pins), enabling non-intrusive in-system programming and full-speed debugging without emulation hardware. It is natively supported by Silicon Labs' Simplicity Studio IDE and third-party tools like Keil µVision with appropriate C2 adapters, as described in Section 25 of the Rev. 1.3 datasheet.
C8051F546-IM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 24-WFQFN Exposed Pad
- Series:
- C8051F54x
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 50MHz
- Connectivity:
- SMBus (2-Wire/I2C), LINbus, SPI, UART/USART
- Peripherals:
- POR, PWM, Temp Sensor, WDT
- Number of I/O:
- 18
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1.25K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.25V
- Data Converters:
- A/D 18x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
C8051F546-IM FAQ
1.How can I place an order for C8051F546-IM through Aetrix?
Please submit a Request for Quotation (RFQ) for C8051F546-IM 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 C8051F546-IM reliable?
The price and inventory of C8051F546-IM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for C8051F546-IM is usually 5 days.
3.What payment methods are accepted for C8051F546-IM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for C8051F546-IM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for C8051F546-IM?
C8051F546-IM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your C8051F546-IM 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 C8051F546-IM?
For technical support, including C8051F546-IM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your C8051F546-IM requirements.
6.How does Aetrix verify that C8051F546-IM is sourced from the original manufacturer or authorized distributors?
All C8051F546-IM 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 C8051F546-IM meets industry standards.
7.What is the process for return or replacement of C8051F546-IM?
All C8051F546-IM units undergo pre-shipment inspection (PSI). If there is an issue with C8051F546-IM, 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 C8051F546-IM part is unused and in its original packaging.
Return procedure for C8051F546-IM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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