EFM32LG842F256G-F-QFP64 - 256KB Flash ARM Cortex-M3 MCU | Silicon Labs
MPN： EFM32LG842F256G-F-QFP64 ✓ 啟用中EFM32LG842F256G-F-QFP64 概覽
A microcontroller (MCU) is an integrated circuit that combines a processor core, program memory, RAM, and configurable I/O peripherals on a single die, providing a self-contained compute platform for embedded applications. The EFM32LG family is positioned within the broader hierarchy: microcontroller -> embedded processor -> semiconductor IC, and is differentiated by Silicon Labs' Low Energy Technology that uses autonomous peripherals, fast wake-up, and multiple sleep modes to minimize average system power. This category is widely used in IoT, metering, sensor hubs, and human-machine interface (HMI) designs.
Key features include 53 digital I/O lines, 4 x 16-bit timer/counters, integrated LCD driver, 12-bit ADC, AES-128 crypto accelerator, and the LESENSE/TIMER/RTC autonomous peripheral set that can wake the CPU only when needed. The device also offers USB, UART, I2C, and SPI interfaces, plus a 16-channel DMA engine and on-chip debugging via SWD/JTAG. The energy-aware design philosophy delivers deterministic interrupt latency with deep-sleep current of approximately 0.65 uA.
Architecturally, the EFM32LG842F256G-F-QFP64 uses the industry-standard ARM Cortex-M3 core with Thumb-2 instruction set and hardware divide, paired with Silicon Labs' proprietary peripheral reflex system that allows sensors and timers to operate without CPU intervention. This combination yields responsive event handling at sub-microsecond wake times while preserving battery life in duty-cycled applications.
Typical applications include battery-powered IoT nodes, wireless sensor hubs, smart metering, wearable fitness/health devices, industrial sensor front-ends, and low-power human-interface products with LCD displays. The wide operating voltage range and integrated LCD controller make it especially attractive for battery-powered utility meters and portable medical devices.
When designing with this part, note that the 64-pin TQFP package requires careful PCB layout to keep analog and digital grounds separate, and decoupling capacitors should be placed within 3 mm of each supply pin. Use Simplicity Studio and the energyAware Profiler to characterize average current across sleep/wake duty cycles.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 EFM32LG842F256G-F-QFP64 — 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： EFM32LG842F256G-F-QFP64 （相同外形與佔位） — 差異在於 ADC, AES Hardware Accelerator, Maximum CPU Clock, Operating Temperature, RAM.
EFM32LG842F256G-E-QFP64
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32LG842F256G-F-QFP64R
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32LG842F256G-QFP64
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32LG232F256G-QFP64
✅ 直接替換📋 參考替代品（不在目錄中）
EFM32G232F128G-E-QFP64R
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →EFM32LG842F256G-F-QFP64 最大額定值與電氣特性
| Core | ARM Cortex-M3 (32-bit) |
| Maximum CPU Clock | 48 MHz |
| Flash Memory | 256 kB |
| RAM | 32 kB |
| Supply Voltage (Vcc/Vdd) | 1.85 V to 3.8 V |
| Digital I/O Pins | 53 |
| Timer/Counter | 4 x 16-bit |
| ADC | 12-bit |
| LCD Driver | Yes (integrated) |
| AES Hardware Accelerator | AES-128 |
| Stop Mode Current | 0.65 uA (typical) |
| Run Mode Current | 211 uA/MHz |
| 封裝 | 64-TQFP (10x10 mm) |
| 工作溫度 | -40C to +85C (industrial grade -F) |
| RoHS 狀態 | Compliant |
| 安裝類型 | Surface Mount |
EFM32LG842F256G-F-QFP64 腳位配置
| 腳位 1 | VDD — Digital supply voltage |
| 腳位 2 | PA0 — GPIO port A bit 0 (5V tolerant) |
| 腳位 3 | PA1 — GPIO port A bit 1 (5V tolerant) |
| 腳位 4 | PA2 — GPIO port A bit 2 (5V tolerant) |
| 腳位 5 | PA3 — GPIO port A bit 3 (5V tolerant) |
| 腳位 6 | PA4 — GPIO port A bit 4 (5V tolerant) |
| 腳位 7 | PA5 — GPIO port A bit 5 (5V tolerant) |
| 腳位 8 | PA6 — GPIO port A bit 6 (5V tolerant) |
| 腳位 9 | PA7 — GPIO port A bit 7 (5V tolerant) |
| 腳位 10 | PA8 — GPIO port A bit 8 (5V tolerant) |
| 腳位 11 | PA9 — GPIO port A bit 9 (5V tolerant) |
| 腳位 12 | PA10 — GPIO port A bit 10 (5V tolerant) |
| 腳位 13 | PA11 — GPIO port A bit 11 (5V tolerant) |
| 腳位 14 | PA12 — GPIO port A bit 12 (5V tolerant) |
| 腳位 15 | PA13 — GPIO port A bit 13 (5V tolerant) |
| 腳位 16 | PA14 — GPIO port A bit 14 (5V tolerant) |
| 腳位 17 | PA15 — GPIO port A bit 15 (5V tolerant) |
| 腳位 18 | PB0 — GPIO port B bit 0 (5V tolerant) |
| 腳位 19 | PB1 — GPIO port B bit 1 (5V tolerant) |
| 腳位 20 | PB2 — GPIO port B bit 2 (5V tolerant) |
| 腳位 21 | PB3 — GPIO port B bit 3 (5V tolerant) |
| 腳位 22 | PB4 — GPIO port B bit 4 (5V tolerant) |
| 腳位 23 | PB5 — GPIO port B bit 5 (5V tolerant) |
| 腳位 24 | PB6 — GPIO port B bit 6 (5V tolerant) |
| 腳位 25 | PB7 — GPIO port B bit 7 (5V tolerant) |
| 腳位 26 | PB8 — GPIO port B bit 8 (5V tolerant) |
| 腳位 27 | PB9 — GPIO port B bit 9 (5V tolerant) |
| 腳位 28 | PB10 — GPIO port B bit 10 (5V tolerant) |
| 腳位 29 | PB11 — GPIO port B bit 11 (5V tolerant) |
| 腳位 30 | PB12 — GPIO port B bit 12 (5V tolerant) |
| 腳位 31 | PB13 — GPIO port B bit 13 (5V tolerant) |
| 腳位 32 | PB14 — GPIO port B bit 14 (5V tolerant) |
| 腳位 33 | PB15 — GPIO port B bit 15 (5V tolerant) |
| 腳位 34 | PC0 — GPIO port C bit 0 (5V tolerant) |
| 腳位 35 | PC1 — GPIO port C bit 1 (5V tolerant) |
| 腳位 36 | PC2 — GPIO port C bit 2 (5V tolerant) |
| 腳位 37 | PC3 — GPIO port C bit 3 (5V tolerant) |
| 腳位 38 | PC4 — GPIO port C bit 4 (5V tolerant) |
| 腳位 39 | PC5 — GPIO port C bit 5 (5V tolerant) |
| 腳位 40 | PC6 — GPIO port C bit 6 (5V tolerant) |
| 腳位 41 | PC7 — GPIO port C bit 7 (5V tolerant) |
| 腳位 42 | PC8 — GPIO port C bit 8 (5V tolerant) |
| 腳位 43 | PC9 — GPIO port C bit 9 (5V tolerant) |
| 腳位 44 | PC10 — GPIO port C bit 10 (5V tolerant) |
| 腳位 45 | PC11 — GPIO port C bit 11 (5V tolerant) |
| 腳位 46 | PC12 — GPIO port C bit 12 (5V tolerant) |
| 腳位 47 | PC13 — GPIO port C bit 13 (5V tolerant) |
| 腳位 48 | PC14 — GPIO port C bit 14 (5V tolerant) |
| 腳位 49 | PC15 — GPIO port C bit 15 (5V tolerant) |
| 腳位 50 | PD0 — GPIO port D bit 0 |
| 腳位 51 | PD1 — GPIO port D bit 1 |
| 腳位 52 | PD2 — GPIO port D bit 2 |
| 腳位 53 | PD3 — GPIO port D bit 3 |
| 腳位 54 | PD4 — GPIO port D bit 4 |
| 腳位 55 | PD5 — GPIO port D bit 5 |
| 腳位 56 | PD6 — GPIO port D bit 6 |
| 腳位 57 | PD7 — GPIO port D bit 7 |
| 腳位 58 | SWDIO — Serial Wire Debug I/O |
| 腳位 59 | SWCLK — Serial Wire Debug Clock |
| 腳位 60 | RESETn — Reset input (active low) |
| 腳位 61 | VSS — Digital ground |
| 腳位 62 | VDD — Digital supply voltage |
| 腳位 63 | AVDD — Analog supply voltage |
| 腳位 64 | AVSS — Analog ground |
典型應用
EFM32LG842F256G-F-QFP64 適用於 6 應用s: Battery-Powered IoT Sensor Nodes, Smart Metering and Utility Endpoints, Wearable Fitness and Health Devices, Industrial Sensor Front-Ends, Human-Machine Interface (HMI) with Keypad/LCD, Low-Power Wireless Protocols (Zigbee/BLE Hubs).
Battery-Powered IoT Sensor Nodes
The EFM32LG842F256G-F-QFP64 is well-suited for battery-powered IoT sensor nodes because its 0.65 uA Stop mode current and 211 uA/MHz Run mode current enable multi-year lifetimes from a single CR2032 or 2x AA battery. The integrated 12-bit ADC, AES-128 hardware accelerator, and 256 kB Flash provide sufficient code space for Zigbee, BLE-proprietary, or LoRaWAN stack implementations. Autonomous peripherals such as LESENSE, timer, and RTC can wake the MCU on-demand without CPU intervention, dramatically reducing average system power in duty-cycled sensing applications.
推薦
Smart Metering and Utility Endpoints
The EFM32LG842F256G-F-QFP64 fits smart metering endpoint designs because the integrated LCD driver eliminates an external LCD controller, reducing BOM and PCB area. The 53 GPIO pins can drive segmented LCD displays and multiple metrology inputs, while the wide 1.85-3.8 V supply range supports direct Li-ion or alkaline battery connection. Hardware AES-128 enables secure communication with utilities, and the Cortex-M3 core at 48 MHz handles metrology algorithms and protocol stack concurrently with low average power.
推薦
Wearable Fitness and Health Devices
The EFM32LG842F256G-F-QFP64 is suitable for wearable fitness/health applications because its sub-uA sleep currents and fast wake-up time preserve battery life for heart-rate, motion, and temperature sensors that sample intermittently. The integrated 12-bit ADC captures multiple biosignals, and the Cortex-M3 core runs activity recognition or pedometer algorithms. 53 GPIO pins connect to BLE radio, OLED display, and haptic drivers, while the 64-TQFP package offers proven manufacturability for high-volume consumer wearables.
推薦
Industrial Sensor Front-Ends
The EFM32LG842F256G-F-QFP64 fits industrial sensor-front-end modules because the -40C to +85C industrial temperature grade and 1.85-3.8 V wide supply range tolerate harsh factory environments and 4-20 mA loop-powered configurations. The 256 kB Flash holds industrial protocol libraries (IO-Link, Modbus, HART) while 32 kB RAM supports stack buffers. The peripheral reflex system allows the device to handle interrupts deterministically and route sensor data through DMA without CPU wake-up, minimizing latency in control loops.
推薦
Human-Machine Interface (HMI) with Keypad/LCD
The EFM32LG842F256G-F-QFP64 powers HMI panels because the integrated LCD driver supports up to 8x36 segments, eliminating an external LCD controller and reducing BOM cost. The 53 GPIO and 4x16-bit timer resources handle multi-button keypad scanning, LED dimming via PWM, and rotary encoder inputs concurrently. The Cortex-M3 core runs graphical menu logic and communication stacks while the AES-128 accelerator secures any connected wireless protocols.
推薦
Low-Power Wireless Protocols (Zigbee/BLE Hubs)
The EFM32LG842F256G-F-QFP64 is ideal for low-power wireless protocol hub designs where 256 kB Flash holds the full Zigbee 3.0 or BLE 5.x stack plus application code. The 32 kB RAM supports concurrent link tables and OTA update buffers. AES-128 hardware acceleration offloads encryption from the Cortex-M3 core, freeing CPU cycles for application logic. Ultra-low sleep currents of 256 uA/MHz and 0.65 uA Stop preserve battery life when the radio is idle and the MCU duty-cycles for periodic beacons or sensor reads.
推薦
推薦產品摘要
工程參考資料，適用於 EFM32LG842F256G-F-QFP64 — 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 | EFM32LG842F256G-E-QFP64 | EFM32LG842F256G-F-QFP64R | EFM32LG842F256G-QFP64 | EFM32LG232F256G-QFP64 | EFM32G232F128G-E-QFP64R |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Flash Memory | 256 kB | 256 kB | 256 kB | 256 kB | 256 kB | 128 kB (-50%) |
| RAM | 32 kB | 32 kB | 32 kB | 32 kB | 32 kB | 16 kB (-50%) |
| Operating Temperature | -40C to +85C (industrial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +125C (extended) |
| Core | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| LCD Driver | Yes (integrated) | Yes | Yes | Yes | No (reduced feature set) | Yes |
| GPIO Pins | 53 | 53 | 53 | 53 | 53 | 53 |
主要差異化特點
- Industrial temperature grade with full Flash/RAM (對比EFM32G232F128G-E-QFP64R)
- Reduced feature 232 variant for cost-sensitive designs (對比EFM32LG232F256G-QFP64)
- Tape-and-reel variant for high-volume production (對比EFM32LG842F256G-F-QFP64R)
設計說明
Estimated: To achieve the datasheet Stop-mode current of 0.65 uA, disable unused peripherals via the peripheral clock gating registers and disable the HFRCO (high-frequency RC oscillator) when only the LFRCO is needed for RTC. Use GPIO retention (RETAIN_ROUTELOCK) to keep I/O states during deep-sleep entry/exit. Avoid floating inputs on unused GPIO as they can leak tens of uA through the input buffer; configure all unused pins as analog-disabled outputs driving low or high.
Place decoupling capacitors (100 nF ceramic) within 3 mm of every VDD/VSS pin pair. Use a single solid ground plane under the MCU; split analog and digital grounds only at the AGND pin return path. The 64-TQFP 10x10 mm package has a moderate thermal resistance suitable for circuit-board reduction of hot-spot, but at 211 uA/MHz the device stays cool in normal operation. For applications using the integrated ADC, separate the analog supply (AVDD) from noisy digital rails with a ferrite bead and 10 uF bulk capacitor to preserve ADC accuracy.
Do not exceed the absolute maximum 3.8 V supply voltage; coin-cell batteries can sag or spike above this under fault conditions. The 12-bit ADC requires clean reference voltage - do not share AVSS with noisy digital grounds or the ADC readings will show offset errors. When migrating from the EFM32LG (Cortex-M3) family to EFM32GG (Cortex-M4) family, verify peripheral register map changes; the GPIO migration is largely compatible but DMA and timer channels may differ. Use Simplicity Studio's energyAware Profiler to measure real average current in duty-cycled designs rather than relying on datasheet peak currents.
合規資訊
RoHS and REACH compliant per Silicon Labs product page. Not AEC-Q100 qualified (industrial grade -F); for automotive applications, choose EFM32LG842F256G-E-QFP64 with extended temperature range.
