EFM32G840F32-QFN64 - 32MHz Cortex-M3 MCU | Silicon Labs
MPN： EFM32G840F32-QFN64 ✗ 停產EFM32G840F32-QFN64 概覽
A microcontroller is a programmable system-on-chip that integrates a processor core, memory, digital interfaces, timers, analog peripherals, and power-management functions. The EFM32G840F32-QFN64 belongs to the EFM32 Gecko family and combines an ARM Cortex-M3 core with low-power operating techniques, short wake-up behavior, and energy-saving modes for battery-operated and portable equipment.
Verified product information identifies 32 kB Flash, 8 kB RAM, 56 digital I/O pins, three 16-bit timers, and operation up to 32 MHz. The device is intended for applications that require compact embedded control, efficient peripheral integration, and low-energy operation. Its 64-QFN package provides a high pin count for digital connectivity in a relatively small surface-mount footprint.
The EFM32G840F32-QFN64 is suitable for sensor nodes, industrial monitoring, building automation, portable measurement equipment, connected embedded products, and low-power control systems. The exposed pad supports thermal management when the device dissipates power during operation; PCB copper and thermal design should follow the manufacturer package guidance.
When designing around this MCU, verify the exact pin multiplexing, supply requirements, peripheral availability, and package-specific exposed-pad requirements against the manufacturer datasheet. Do not substitute a different package or pin count without reviewing the complete pinout and board footprint.
This page consolidates verified manufacturer and distributor information, datasheet access, application context, and replacement-screening guidance. It is intended to help engineers identify the correct EFM32G840F32-QFN64 for embedded designs rather than treating similar ARM MCUs as automatically interchangeable.
直接替換替代品，適用於 EFM32G840F32-QFN64 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： EFM32G840F32-QFN64 （相同外形與佔位） — 差異在於 Digital I/O Pins, Flash Memory, Package.
EFM32G840F32-QFN64T
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32G840F128-QFN64
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32G840F64-QFN64
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →EFM32TG840F32-QFN64T
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32G840F32-QFN64T
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32G840F32-QFN64 最大額定值與電氣特性
| Core | ARM Cortex-M3 |
| Architecture | 32-bit RISC |
| Maximum Clock Speed | 32 MHz |
| Flash Memory | 32 kB |
| RAM Memory | 8 kB |
| Digital I/O Pins | 56 |
| Timers | 3 x 16-bit timers |
| 供應電壓 | 1.98 V to 3.8 V |
| Nominal Supply Levels | 2.5 V / 3.3 V |
| 封裝 | 64-QFN (9 x 9 mm) with exposed pad |
| 安裝類型 | Surface mount |
| Product Family | EFM32 Gecko |
| Low-Power Features | Low-energy techniques and energy-saving modes |
| Wake-Up Behavior | Fast wake-up from energy-saving modes |
| Max Operating Temperature | 85 C |
EFM32G840F32-QFN64 64-qfn (9 x 9 mm) with exposed pad 腳位配置指南
EFM32G840F32-QFN64（64-qfn (9 x 9 mm) with exposed pad 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： EFM32G840F32-QFN64.
請參閱 資料表 以查看完整腳位配置。
典型應用
EFM32G840F32-QFN64 適用於 6 應用s: Battery-Powered Sensor Node, Industrial Monitoring and Control, Building Automation Endpoint, Portable Measurement Instrument, Connected Embedded Product, LED Lighting Controller.
Battery-Powered Sensor Node
The EFM32G840F32-QFN64 fits battery-powered sensor nodes because its ARM Cortex-M3 core runs up to 32 MHz while the Gecko platform provides low-energy techniques, fast wake-up times, and energy-saving modes. The device can periodically read sensors, process data, transmit results, and return to a low-power state. Its 8 kB RAM and 32 kB Flash provide local working memory and firmware storage, respectively. The 56 digital I/O pins support sensor interrupts, switches, indicators, and interface signals. Design the duty cycle, regulator quiescent current, and peripheral shutdown behavior around the system battery budget. Wake latency and average current should be measured in the final hardware because they depend on firmware, clock settings, and the selected energy mode.
推薦
Industrial Monitoring and Control
The EFM32G840F32-QFN64 is suitable for industrial monitoring modules that need deterministic embedded control, multiple digital inputs, and low-power operation. Its ARM Cortex-M3 processor can execute acquisition, filtering, thresholding, and communication tasks at up to 32 MHz. The 56 digital I/O pins can be assigned through the device pin multiplexing to digital sensors, alarm lines, status indicators, and control outputs. Three 16-bit timers provide useful timing resources for sampling, pulse measurement, or periodic control. The 1.98 V to 3.8 V supply range supports integration with carefully selected low-voltage rails, but industrial transients and grounding still require board-level protection. Validate EMC, isolation, and thermal performance in the final enclosure rather than relying only on the MCU specifications.
推薦
Building Automation Endpoint
The EFM32G840F32-QFN64 can serve as a low-power building-automation endpoint for occupancy, environmental, or equipment-control functions. Its 56 digital I/O pins allow connection to inputs, relay drivers, light-control signals, and status LEDs, while three 16-bit timers support periodic sampling and timing tasks. The Cortex-M3 core can manage protocol stacks and local control logic without requiring a higher-performance processor. Energy-saving modes and fast wake-up are useful for devices that remain connected to a common rail or operate from a local energy source. In a building installation, account for long idle periods, capacitor behavior during wake-up, and communication retry logic. Firmware should disable unused peripherals and use the manufacturer’s recommended clock and pin configurations.
推薦
Portable Measurement Instrument
The EFM32G840F32-QFN64 fits portable measurement instruments that combine local sensing, signal conditioning, display or communications, and strict energy limits. Its 32 MHz Cortex-M3 core provides enough performance for digital filtering, calibration tables, and control algorithms, while 8 kB RAM supports working buffers and 32 kB Flash stores firmware. The 56-pin digital interface can support sensor selects, measurement triggers, buttons, and status indicators. Low-energy modes can reduce consumption between measurements, while fast wake-up allows the instrument to respond without continuous full-power operation. The exposed-pad package requires a thermal-aware PCB footprint, and analog front-end accuracy should be kept separate from the digital MCU supply design. Validate battery life using the actual measurement interval and radio or display workload.
推薦
Connected Embedded Product
The EFM32G840F32-QFN64 can be used in connected embedded products that need a compact control MCU and a manageable number of digital peripherals. The processor executes application logic and communication supervision, while the 56 digital I/O pins handle device presence, user controls, status LEDs, and peripheral selects. The 32 MHz Cortex-M3 performance is suitable for protocol handling and event-driven control, while the 8 kB RAM and 32 kB Flash impose a firm firmware and buffer budget. Low-power modes are valuable when connectivity is intermittent, but radio or network modules may dominate the total power budget. Firmware should define wake conditions, retry limits, and peripheral shutdown order. If the product uses high-speed communication, verify signal integrity and power sequencing rather than assuming a similar ARM MCU is interchangeable.
推薦
LED Lighting Controller
The EFM32G840F32-QFN64 is suitable for compact LED-lighting controllers that require deterministic timing, control outputs, and low standby consumption. Its three 16-bit timers can support timing-intensive control tasks, while the 56 digital I/O pins can drive status indicators, buttons, dimming signals, or fault inputs. The Cortex-M3 core at up to 32 MHz can manage dimming logic, watchdog behavior, user-interface updates, and communication supervision. Energy-saving modes help reduce consumption when the lighting output is disabled or the controller is idle. The exact external LED-driver interface, current rating, switching topology, and thermal performance are outside the MCU’s supplied specifications. Confirm the exposed-pad connection and package footprint in the manufacturer documentation, and test dimming behavior across supply and temperature conditions.
推薦
推薦產品摘要
工程參考資料，適用於 EFM32G840F32-QFN64 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | EFM32G840F32-QFN64T | EFM32G840F128-QFN64 | EFM32G840F64-QFN64 | EFM32TG840F32-QFN64T | EFM32G840F32-QFN64T |
|---|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| CPU Core | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 |
主要差異化特點
- Direct 32 MHz Cortex-M3 control with 32 kB Flash and 8 kB RAM (對比EFM32G840F32-QFN64T)
- Low-energy Gecko positioning (對比EFM32TG840F32-QFN64T)
- High pin-count integration in 9 x 9 mm QFN (對比EFM32G840F128-QFN64)
設計說明
Design the supply rail around the verified 1.98 V to 3.8 V operating range, while accounting for startup current, peripheral load, and regulator transient response. Place the MCU’s decoupling capacitors close to the supply and ground pins according to the manufacturer layout guidance. Do not treat the nominal 2.5 V or 3.3 V descriptions as permission to omit voltage-margin analysis. Confirm the complete electrical limits in the datasheet before finalizing the power tree.
The 64-QFN package includes an exposed pad, so the PCB footprint must provide the manufacturer-required thermal and electrical land pattern. Use a continuous ground connection beneath the device where recommended, preserve solder mask and paste geometry, and provide copper for heat spreading. Actual temperature rise depends on MCU utilization, supply voltage, ambient temperature, and board construction; measure the assembled design rather than relying on a nominal package label.
Do not create a replacement footprint from the generic name “64-QFN.” Verify pin numbering, pin 1 orientation, exposed-pad dimensions, paste apertures, and solder-mask clearance from the package drawing. The supplied verified data does not include the complete numbered pinout, so an engineering release must use the official Gecko datasheet and package drawing. This is especially important for EFM32G840F32-QFN64T or other same-package candidates because package markings alone do not prove pin compatibility.
A similar ARM Cortex-M3 core and 64-QFN package are not sufficient evidence for a drop-in replacement. Compare memory, peripheral mappings, interrupt vectors, clock defaults, supply limits, startup behavior, bootloader assumptions, and exposed-pad requirements. In particular, EFM32G840F32-QFN64T and EFM32TG840F32-QFN64T appear in the supplied cross-reference material, but complete pin-level equivalence is not proven. Validate with the manufacturer documentation and a hardware bring-up test.
Use the Gecko energy-saving modes as part of the system power budget, not as an isolated feature. Define which peripherals remain powered, how the MCU wakes, and what data must survive between sleep intervals. Firmware should disable unused clocks and peripherals and avoid unnecessary polling. Measure average current at the system level because regulators, sensors, communications, pull networks, and exposed-pad thermal behavior can dominate the MCU’s contribution.
合規資訊
The supplied verified manufacturer and distributor snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Confirm current declarations on the manufacturer product page and applicable distributor records.
