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Silicon Labs C8051F546-IMR
- Part No.:
- C8051F546-IMR
- Manufacturer:
- Silicon Labs
- Category:
- Microcontrollers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
C8051F546-IMR.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
C8051F546-IMR from Silicon Laboratories is a mixed-signal, ISP Flash MCU with an 8051 core, 8 kB flash, 1280 B RAM, 12-bit ADC (200 ksps), LIN 2.1 controller, and 24-pin QFN package. It operates from 1.8–5.25 V, draws 19 mA at 50 MHz, and supports automotive applications up to +125°C.
For engineers reviewing the C8051F546-IMR datasheet, C8051F546-IMR pinout, C8051F546-IMR application, or C8051F546-IMR equivalent, key selection criteria include LIN bus integration without external crystal, on-chip temperature sensor, 5 V-tolerant I/O, low-power stop mode (1 μA), and AEC-Q100 qualification for under-hood automotive control.
Technical Context
The C8051F546-IMR implements a pipelined CIP-51 8051 core delivering 50 MIPS at 50 MHz, with on-the-fly clock source switching between internal 24 MHz oscillator (±0.5% accuracy) and external sources. Its LIN 2.1 controller supports both master and slave modes and eliminates need for external crystal timing.
Digital peripherals include hardware-enhanced UART, SMBus, enhanced SPI, four 16-bit timers, and a 16-bit programmable counter array (PCA) with six capture/compare modules and PWM capability. Analog resources comprise a 12-bit ADC with 25 external inputs, two comparators with programmable hysteresis, and an integrated temperature sensor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | High-speed CIP-51 8051, executes 70% of instructions in 1–2 clocks |
| Flash / RAM | 8 kB ISP flash (512-byte sectors); 1280 B RAM (256 B IRAM + 1024 B XRAM) |
| ADC | 12-bit, up to 200 ksps, 25-channel analog multiplexer, internal VREF or external reference |
| LIN Interface | Full LIN 2.1 controller (master/slave), crystal-free operation using internal 24 MHz oscillator |
| Supply & Power | 1.8–5.25 V operation; 19 mA typical @ 50 MHz; 1 μA stop mode current |
| Temperature Range | –40°C to +125°C; AEC-Q100 qualified for automotive use |
| I/O Pins | 18 GPIO, all 5 V tolerant, configurable as analog/digital via crossbar priority decoder |
Pinout & Package
Package: 24-pin QFN (5 × 5 mm, 0.5 mm pitch), RoHS-compliant, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main digital/analog supply (1.8–5.25 V); decoupling required per datasheet layout guidelines |
| GND | Ground reference | Analog and digital ground shared; thermal pad must be soldered to PCB ground plane |
| P0.0–P0.7 | Port 0 I/O | 8-bit bidirectional port; 5 V tolerant; configurable as analog input, digital I/O, or peripheral function (e.g., UART0 TX/RX) |
| P1.0–P1.7 | Port 1 I/O | 8-bit bidirectional port; 5 V tolerant; supports external interrupt, PCA, comparator inputs, LIN TX/RX |
| P2.0–P2.3 | Port 2 I/O | 4-bit bidirectional port; 5 V tolerant; assignable to SMBus, SPI, ADC, or general-purpose I/O |
| C2CK / C2D | Debug interface | 2-wire C2 interface for in-system programming and non-intrusive debug; shares pins with P0.2/P0.3 |
| XTAL1 / XTAL2 | Oscillator input/output | Supports external crystal, RC, or clock source; optional when using internal 24 MHz oscillator for LIN |
Key Features
| Feature | Design Value |
|---|---|
| LIN 2.1 Controller | Integrated master/slave LIN interface with crystal-free operation enabled by ±0.5% internal 24 MHz oscillator - eliminates external timing component and reduces BOM cost |
| On-Chip Debug (C2) | Full-speed, non-intrusive in-system debug using only two pins; no emulator or target pod required - accelerates firmware validation and field diagnostics |
| 12-Bit ADC with Temp Sensor | 200 ksps sampling with built-in temperature sensor and flexible reference selection (VDD, internal VREF, or external) - enables closed-loop thermal monitoring without external sensors |
| 5 V-Tolerant I/O | All 18 GPIO pins withstand 5 V regardless of VDD level (1.8–5.25 V) - simplifies interfacing with legacy 5 V peripherals and eases voltage-level translation |
| 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 subsystems |
Applications
| Body Control Module (BCM) | Engine Coolant Temperature Monitor |
|---|---|
Use Scenario: Centralized control of lighting, door locks, window lifts, and wipers in modern vehicles. IC Role / Device Role / Timing Role: Primary microcontroller managing LIN-connected slave nodes (e.g., mirror controls, seat modules) and local analog sensing. Use Value: Crystal-free LIN master capability reduces component count; 5 V-tolerant I/O interfaces directly with legacy switches and relays; AEC-Q100 rating ensures reliability in under-dash environments. | Use Scenario: Real-time measurement of engine coolant temperature for ECU feedback and dashboard display. IC Role / Device Role / Timing Role: Standalone analog front-end and signal conditioner, converting thermistor voltage to calibrated digital value via 12-bit ADC and internal temperature sensor calibration. Use Value: On-chip 12-bit ADC with selectable gain and internal VREF eliminates external op-amp and reference IC; ±0.5% oscillator enables precise LIN communication with coolant sensor node. |
| Roof Module with Sunroof Control | Automotive Seat Position Sensor Interface |
Use Scenario: Integrated roof console managing sunroof actuation, ambient light sensing, and interior lighting dimming. IC Role / Device Role / Timing Role: Mixed-signal controller acquiring analog light sensor data, driving motor drivers via PWM, and communicating status over LIN to body domain controller. Use Value: Six PCA PWM channels support independent motor and LED dimming; 18 GPIO allow direct connection to Hall sensors and limit switches; 1 μA stop mode enables ultra-low quiescent current during vehicle sleep. | Use Scenario: Acquisition and preprocessing of potentiometer or Hall-effect signals indicating seat fore/aft and recline position. IC Role / Device Role / Timing Role: Signal acquisition node converting analog seat sensor outputs into calibrated digital values and transmitting via LIN to memory seat module. Use Value: 25-channel ADC multiplexer supports multiple seat sensors simultaneously; built-in temperature compensation improves position accuracy across cabin temperature range; AEC-Q100 compliance ensures long-term stability in high-vibration seating environment. |
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-IMR | Same 24-pin QFN package, identical core/peripherals, but 16 kB flash and 256 B additional RAM | Preferred where larger firmware footprint or future feature expansion is anticipated | Select C8051F536-IMR if >8 kB code space is required; otherwise C8051F546-IMR offers optimal cost/performance balance for LIN-centric designs |
| TLV320AIC3104IRHBR | Audio codec with integrated ADC/DAC, not an MCU; lacks LIN, flash, or programmable core | Not a functional substitute; used only in audio subsystems requiring analog audio I/O | Not suitable as replacement; C8051F546-IMR provides full programmable control + analog acquisition, while TLV320AIC3104IRHBR serves dedicated audio signal path |
Compared with C8051F536-IMR, the C8051F546-IMR trades flash capacity for lower unit cost and identical peripheral set - ideal for LIN-based control nodes with fixed firmware. Unlike TLV320AIC3104IRHBR, it delivers autonomous embedded control rather than signal conditioning, making it appropriate for sensor fusion and actuator management in automotive domains.
Availability
C8051F546-IMR is available at Aetrix Electronics and suitable for automotive body electronics, LIN sensor nodes, and under-hood temperature monitoring requiring stable component supply and long lifecycle support.
Supply support for C8051F546-IMR 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 mixed-signal ICs for timing, MCU, wireless, and sensor applications, with deep expertise in low-power and automotive-grade design.
The C8051F54x family targets cost-sensitive, high-reliability automotive subsystems requiring LIN connectivity, integrated analog front-ends, and AEC-Q100 compliance - especially body control, thermal monitoring, and smart actuator nodes.
FAQ
Is C8051F546-IMR still recommended for new designs?
No, the C8051F546-IMR is marked "Not Recommended for New Designs" in Silicon Labs' official documentation (Rev. 1.3, Nov 2023). This designation indicates that newer families (e.g., EFM8 or Simplicity Studio–based platforms) are preferred for roadmap alignment, though C8051F546-IMR remains fully supported for existing production and legacy program continuity. Aetrix Electronics maintains active inventory and lifecycle coordination for this part.
What is the pin-compatible replacement for C8051F546-IMR?
There is no pin-compatible drop-in replacement for C8051F546-IMR. The C8051F536-IMR shares the same 24-pin QFN package and peripheral set but differs in flash size (16 kB vs. 8 kB) and is also NRD. Migration to EFM8BB series requires PCB redesign due to different pinout, power architecture, and debug interface. Aetrix Electronics can provide migration path analysis and sample support for qualifying next-generation alternatives.
Does C8051F546-IMR support crystal-free LIN operation?
Yes, the C8051F546-IMR supports crystal-free LIN 2.1 operation using its internal 24 MHz oscillator with ±0.5% accuracy - sufficient for LIN baud rate tolerance (±1.5%). This eliminates the need for an external crystal or resonator in LIN master or slave configurations, reducing BOM cost and board area. Configuration is handled via oscillator control registers (OSCXCN) and LIN baud rate registers (LINBRT).
What debug interface does C8051F546-IMR use, and how many pins are required?
The C8051F546-IMR uses the 2-wire C2 debug interface, requiring only C2CK and C2D pins (shared with P0.2 and P0.3). This enables full-speed, non-intrusive in-system programming and debugging without halting CPU execution. No external emulator, ICE chip, or target pod is needed - lowering development tooling cost and simplifying bring-up for C8051F546-IMR-based designs.
Can C8051F546-IMR operate at 5 V supply while maintaining 1.8 V logic compatibility?
No - the C8051F546-IMR operates from 1.8 V to 5.25 V, but its I/O pins are 5 V tolerant *only when VDD ≥ 2.2 V*. At VDD = 1.8 V, absolute maximum input voltage is limited to VDD + 0.3 V (i.e., 2.1 V). Therefore, true 5 V logic compatibility requires VDD ≥ 2.2 V. The device's 5 V-tolerant I/O simplifies interfacing with 5 V peripherals *when powered within spec*, but does not imply dual-supply operation.
C8051F546-IMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 24-WFQFN Exposed Pad
- Series:
- C8051F54x
- Packaging:
- Tape & Reel (TR)
- 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-IMR FAQ
1.How can I place an order for C8051F546-IMR through Aetrix?
Please submit a Request for Quotation (RFQ) for C8051F546-IMR 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-IMR reliable?
The price and inventory of C8051F546-IMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for C8051F546-IMR is usually 5 days.
3.What payment methods are accepted for C8051F546-IMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for C8051F546-IMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for C8051F546-IMR?
C8051F546-IMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your C8051F546-IMR 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-IMR?
For technical support, including C8051F546-IMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your C8051F546-IMR requirements.
6.How does Aetrix verify that C8051F546-IMR is sourced from the original manufacturer or authorized distributors?
All C8051F546-IMR 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-IMR meets industry standards.
7.What is the process for return or replacement of C8051F546-IMR?
All C8051F546-IMR units undergo pre-shipment inspection (PSI). If there is an issue with C8051F546-IMR, 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-IMR part is unused and in its original packaging.
Return procedure for C8051F546-IMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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