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Silicon Labs EFM32LG332F256-QFP64
- Part No.:
- EFM32LG332F256-QFP64
- Manufacturer:
- Silicon Labs
- Category:
- Microcontrollers
- Package:
- 64-TQFP
- Datasheet:
-
EFM32LG332F256-QFP64.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 64TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
EFM32LG332F256-QFP64 from Silicon Labs is a 32-bit ARM Cortex-M3 microcontroller operating at up to 48 MHz, featuring 256 kB flash, 32 kB RAM, and ultra-low power consumption - 0.65 μA in Stop mode (EM3) with RAM retention and brown-out detection. It integrates hardware AES encryption, autonomous peripherals including LESENSE and PRS, and supports battery-powered smart metering and industrial automation.
For engineers reviewing the EFM32LG332F256-QFP64 datasheet, EFM32LG332F256-QFP64 pinout, EFM32LG332F256-QFP64 application, or EFM32LG332F256-QFP64 equivalent, key selection considerations include energy mode transitions (2 µs wake-up), analog precision (12-bit ADC @ 1 Msps), USB 2.0 host/OTG support, and TQFP64 package compatibility with legacy PCB layouts.
Technical Context
The EFM32LG332F256-QFP64 implements a flexible energy management architecture with five defined energy modes (EM0–EM4), enabling autonomous peripheral operation down to Deep Sleep (EM2) and Shutoff (EM4) while retaining critical state. Its Peripheral Reflex System (PRS) allows inter-peripheral signaling without CPU intervention, reducing active time and power.
Core timing relies on multiple oscillators: HFXO (up to 48 MHz), LFXO (32.768 kHz RTC), HFRCO/LFRCO/ULFRCO for fast startup and low-power clocking. The integrated USB controller includes on-chip PHY and 5 V-to-3.3 V regulator, supporting full-speed host, device, and OTG roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3 @ 48 MHz - delivers deterministic real-time performance with Thumb-2 instruction set and 3-stage pipeline. |
| Memory | 256 kB flash / 32 kB RAM - sufficient for complex firmware with bootloader, secure boot, and sensor fusion algorithms. |
| Power Consumption | 0.65 μA in EM3 Stop mode - enables multi-year battery life in wireless sensor nodes with periodic wake-up. |
| ADC | 12-bit, 1 Msps, 8 SE / 4 diff channels - supports high-resolution analog sensing (e.g., current monitoring, temperature, pressure). |
| USB Interface | Full-speed USB 2.0 with on-chip PHY and regulator - eliminates external transceiver, simplifying BOM and layout for field-upgradable devices. |
| Security | Hardware AES-128/256 accelerator (54/75 cycles) - enables efficient encrypted communication and secure firmware updates. |
| Energy Modes | EM0–EM4 with sub-μA retention - allows dynamic power scaling across active, sleep, deep sleep, stop, and shutoff states. |
Pinout & Package
TQFP64 (Thin Quad Flat Package, 64-pin, 10 mm × 10 mm, 0.5 mm pitch) - RoHS-compliant, surface-mount package with exposed thermal pad; compatible with standard reflow profiles and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core Power Supply | 1.98–3.8 V main supply; powers CPU, memory, and digital peripherals; requires local 100 nF decoupling. |
| VSS | Digital Ground | Reference ground for digital logic; must be connected to system GND plane with low-inductance path. |
| PA0–PA7, PB0–PB15, PC0–PC15, PD0–PD15 | General Purpose I/O | Up to 93 GPIOs with configurable drive strength, pull-up/down, open-drain, and input filtering; supports PRS routing. |
| USB_DP / USB_DM | USB Differential Pair | Full-speed USB 2.0 interface; requires 27 Ω series resistors and 1.5 kΩ pull-up on DP for device enumeration. |
| HFXTAL / HFXTAL_N | High-Frequency Crystal Input | Connects to 4–48 MHz crystal; enables precise timing for USB, USART, and high-speed peripherals. |
| LFXO_IN / LFXO_OUT | Low-Frequency Crystal Input/Output | Drives 32.768 kHz crystal for RTC and low-energy timer; essential for calendar timekeeping in EM2/EM3. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous PRS | 12-channel Peripheral Reflex System enables hardware-triggered peripheral interactions (e.g., ADC conversion → DMA transfer → GPIO toggle) without CPU involvement. |
| LESENSE | Low Energy Sensor Interface monitors capacitive, inductive, or resistive sensors autonomously in EM2, extending battery life in touch or proximity applications. |
| Backup Power Domain | Separate RTC and retention registers powered by VBAT; maintains real-time clock and critical state during main power loss (e.g., smart meter backup). |
| Integrated LCD Controller | Drives up to 8×36 segments with voltage boost and contrast control; eliminates external display driver IC in portable instrumentation. |
| Low-Energy UART (LEUART) | Operates in EM2 with 32.768 kHz clock; enables asynchronous serial communication at ≤9600 bps while consuming <1 μA - ideal for wake-on-RX in sensor hubs. |
Applications
| Smart Metering | Health & Fitness Wearables |
|---|---|
|
Use Scenario: Gas/water/electricity meter with tamper detection, pulse counting, and RF mesh reporting. IC Role / Device Role / Timing Role: Main system controller managing metrology ADC, pulse counter, LEUART for PLC, and USB for field calibration. Use Value: EM3 Stop mode (0.65 μA) enables >10-year battery life; hardware AES secures firmware updates over-the-air. |
Use Scenario: Optical heart-rate monitor with PPG signal acquisition and motion compensation. IC Role / Device Role / Timing Role: Sensor hub aggregating ADC data from photodiodes, running real-time motion algorithms on Cortex-M3, and transmitting via BLE (via external transceiver). Use Value: LESENSE autonomously samples PPG in EM2, waking CPU only on event - reduces average current to <5 μA. |
| Industrial Automation Sensors | Alarm & Security Systems |
|
Use Scenario: Wireless temperature/humidity node with LoRaWAN backhaul and local alarm triggering. IC Role / Device Role / Timing Role: Data concentrator interfacing with I²C sensors, managing low-power radio sleep/wake cycles, and timestamping events via RTC. Use Value: PRS links RTC alarm → GPIO → radio enable, eliminating CPU polling and cutting active time by >90%. |
Use Scenario: Battery-powered door/window contact sensor with magnetic reed switch and encrypted status reporting. IC Role / Device Role / Timing Role: Ultra-low-power event detector using ACMP + PRS to trigger wake-up and AES-encrypted transmission upon intrusion. Use Value: EM4 Shutoff mode draws 20 nA; wake-up interrupt controller responds to pin change in <2 µs - ensures immediate response to breach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EFM32GG332F256-QFP64 | ARM Cortex-M3 core replaced with Cortex-M4F (with FPU); adds DSP instructions and higher DMIPS/MHz; same pinout and peripheral set. | Better suited for real-time signal processing (e.g., FFT-based vibration analysis), but consumes ~15% more active current. | Select when floating-point math or advanced filtering is required; otherwise, EFM32LG332F256-QFP64 offers lower cost and power. |
| EFM32TG11B520F256GM64 | Successor Gecko family part with Cortex-M4, 256 kB flash, 32 kB RAM, QFN64 package; lacks USB and TFT controller; adds TrustZone security extensions. | Targeted at secure IoT edge nodes requiring PSA Level 2 certification; not drop-in due to different package and missing USB. | Choose for new designs prioritizing security certification and modern toolchain support; not a direct replacement for USB-dependent legacy systems. |
Compared with EFM32GG332F256-QFP64, the EFM32LG332F256-QFP64 delivers identical peripheral integration and ultra-low power at lower active current, while EFM32TG11B520F256GM64 trades USB functionality for enhanced security and newer architecture - making the LG332 optimal for cost-sensitive, battery-constrained USB-enabled applications.
Availability
EFM32LG332F256-QFP64 is available at Aetrix Electronics and suitable for smart metering, health wearables, industrial sensor nodes, and security systems requiring stable component supply and long-term lifecycle assurance.
Supply support for EFM32LG332F256-QFP64 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 Labs is a fabless semiconductor company specializing in low-power MCU, wireless SoC, and timing solutions for IoT and embedded markets.
The EFM32 Leopard Gecko product line was designed specifically for energy-constrained applications demanding high performance per microwatt, with emphasis on autonomous peripherals and rapid wake-up from deep sleep.
FAQ
What is the maximum operating frequency of the EFM32LG332F256-QFP64?
The EFM32LG332F256-QFP64 operates at up to 48 MHz using its high-frequency crystal oscillator (HFXO) or internal HFRCO. This frequency is fully supported across all energy modes where the CPU is active (EM0–EM2), and enables real-time execution of protocol stacks and sensor fusion algorithms without throttling.
Does the EFM32LG332F256-QFP64 support USB device, host, and OTG functionality?
Yes, the EFM32LG332F256-QFP64 integrates a full-speed USB 2.0 controller compliant with USB 2.0 specification, supporting device, host, and OTG roles. It includes an on-chip PHY and embedded 5 V-to-3.3 V regulator, eliminating need for external components in most USB implementations.
What are the lowest power consumption values for EFM32LG332F256-QFP64 in deep sleep and stop modes?
In EM2 Deep Sleep mode, the EFM32LG332F256-QFP64 consumes 0.95 μA (with RTC and 32.768 kHz oscillator active). In EM3 Stop mode, it draws just 0.65 μA while retaining RAM, CPU state, brown-out detection, and power-on reset - verified at 3 V supply per datasheet Rev. 2.44.
Can the EFM32LG332F256-QFP64 operate from a single-cell lithium battery?
Yes, the EFM32LG332F256-QFP64 supports a supply voltage range of 1.98 V to 3.8 V, making it compatible with single-cell Li-ion (3.0–3.7 V) and Li-SOCl₂ (3.6 V nominal) batteries. Its brown-out detector and wide VDD range ensure reliable operation across discharge curves without external regulation.
Is hardware AES acceleration available on the EFM32LG332F256-QFP64?
Yes, the EFM32LG332F256-QFP64 includes a dedicated hardware AES accelerator supporting both 128-bit and 256-bit keys, completing encryption/decryption in 54 or 75 clock cycles respectively. This offloads cryptographic operations from the CPU and enables secure OTA updates and TLS handshake acceleration.
EFM32LG332F256-QFP64 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 64-TQFP
- Series:
- Leopard Gecko
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 48MHz
- Connectivity:
- I2C, IrDA, SmartCard, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 50
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.98V ~ 3.8V
- Data Converters:
- A/D 8x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
EFM32LG332F256-QFP64 FAQ
1.How can I place an order for EFM32LG332F256-QFP64 through Aetrix?
Please submit a Request for Quotation (RFQ) for EFM32LG332F256-QFP64 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 EFM32LG332F256-QFP64 reliable?
The price and inventory of EFM32LG332F256-QFP64 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EFM32LG332F256-QFP64 is usually 5 days.
3.What payment methods are accepted for EFM32LG332F256-QFP64?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EFM32LG332F256-QFP64 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EFM32LG332F256-QFP64?
EFM32LG332F256-QFP64 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EFM32LG332F256-QFP64 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 EFM32LG332F256-QFP64?
For technical support, including EFM32LG332F256-QFP64 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EFM32LG332F256-QFP64 requirements.
6.How does Aetrix verify that EFM32LG332F256-QFP64 is sourced from the original manufacturer or authorized distributors?
All EFM32LG332F256-QFP64 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 EFM32LG332F256-QFP64 meets industry standards.
7.What is the process for return or replacement of EFM32LG332F256-QFP64?
All EFM32LG332F256-QFP64 units undergo pre-shipment inspection (PSI). If there is an issue with EFM32LG332F256-QFP64, 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 EFM32LG332F256-QFP64 part is unused and in its original packaging.
Return procedure for EFM32LG332F256-QFP64:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
EFM32LG332F256-QFP64 Tags
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