Silicon Labs EFM32LG390F128-BGA112

Overview

EFM32LG390F128-BGA112 from Silicon Laboratories is a 32-bit ARM Cortex-M3 microcontroller operating at up to 48 MHz, featuring 128 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, 12-bit ADC (1 Msps), dual DAC, LESENSE, USB 2.0 host/OTG, and TFT direct drive, targeting battery-powered smart metering and industrial automation systems.

For engineers reviewing the EFM32LG390F128-BGA112 datasheet, EFM32LG390F128-BGA112 pinout, EFM32LG390F128-BGA112 application, or EFM32LG390F128-BGA112 equivalent, this page delivers verified energy mode behavior, BGA112 package mapping, peripheral reflex system autonomy, and real-time counter operation across EM0–EM4 modes - critical for low-energy embedded design validation.

Technical Context

The EFM32LG390F128-BGA112 implements a flexible energy management architecture with five defined energy modes (EM0–EM4), where EM2 (Deep Sleep) enables peripheral operation including RTC and LESENSE while drawing just 0.95 μA. Its Peripheral Reflex System (PRS) supports autonomous inter-peripheral signaling without CPU intervention, reducing wake-up latency and active time.

Core clocking includes dual crystal oscillators (HFXO/LFXO), four RC oscillators (HFRCO, LFRCO, ULFRCO, AUXHFRCO), and configurable prescalers. The integrated USB controller features on-chip PHY and embedded 5 V-to-3.3 V regulator, supporting full-speed host and OTG functionality without external components.

Key Specifications

Pinout & Package

BGA112 package: 6 mm × 6 mm body, 0.5 mm ball pitch, 112 I/O balls arranged in 10 × 10 array with corner balls omitted; includes thermal pad (ball A1–J10 center) for enhanced heat dissipation in continuous operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with EFM32LG390F128-BGA112, the EFM32PG12B500F1024GL125 offers higher compute density but sacrifices USB OTG and increases power in active mode; the EFM32GG11B820F2048GL192 provides superior security and bandwidth at the cost of board space and thermal budget - making the LG390 optimal for constrained, USB-connected, ultra-low-power edge nodes.

Availability

EFM32LG390F128-BGA112 is available at Aetrix Electronics and suitable for smart metering, industrial sensor networks, and wearable health devices requiring stable component supply and long-term lifecycle support.

Supply support for EFM32LG390F128-BGA112 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 wireless and MCU solutions for IoT, infrastructure, and industrial markets.

The EFM32 Leopard Gecko family was designed specifically for energy-constrained applications demanding sub-μA sleep currents, autonomous peripheral operation, and integrated analog - enabling decade-long battery life in field-deployed endpoints.

FAQ

What is the maximum operating frequency of the EFM32LG390F128-BGA112?

The EFM32LG390F128-BGA112 operates at up to 48 MHz using its ARM Cortex-M3 core. This frequency is achievable with the high-frequency crystal oscillator (HFXO) or high-frequency RC oscillator (HFRCO), and is sustained across the full supply range (1.98–3.8 V) and temperature range (–40 to +85 °C). The EFM32LG390F128-BGA112 maintains timing compliance per its datasheet Rev. 2.44 specifications under these conditions.

Does the EFM32LG390F128-BGA112 support USB device and host modes simultaneously?

Yes, the EFM32LG390F128-BGA112 supports USB On-The-Go (OTG), enabling dynamic role switching between device and host modes under firmware control. Its integrated USB 2.0 full-speed controller includes on-chip PHY and embedded 5 V-to-3.3 V regulator, allowing direct connection to USB peripherals or hosts without external level shifters. The EFM32LG390F128-BGA112 implements the necessary descriptors and endpoint management to handle both roles within a single firmware image.

How many energy modes does the EFM32LG390F128-BGA112 support, and what is the lowest current draw?

The EFM32LG390F128-BGA112 supports five energy modes: EM0 (Active), EM1 (Sleep), EM2 (Deep Sleep), EM3 (Stop), and EM4 (Shutoff). Its lowest active-retention mode is EM3, drawing 0.65 μA at 3 V with brown-out detection enabled and RAM/CPU state retained. In EM4 Shutoff mode, current drops to 20 nA - though RAM is lost and only pin reset or VDD ramp can wake the EFM32LG390F128-BGA112.

Can the EFM32LG390F128-BGA112 drive an LCD directly?

Yes, the EFM32LG390F128-BGA112 includes an integrated LCD controller supporting up to 8 commons × 36 segments, with built-in voltage boost, programmable contrast, and autonomous animation sequencing. It requires no external LCD driver IC and operates across all energy modes except EM4. The EFM32LG390F128-BGA112's LCD peripheral retains display content during EM3 Stop mode, enabling persistent UI in battery-powered devices.

What analog peripherals are integrated into the EFM32LG390F128-BGA112?

The EFM32LG390F128-BGA112 integrates a 12-bit 1 Msps ADC (8 single-ended or 4 differential channels), a 12-bit 500 ksp s DAC (2 single-ended or 1 differential), three rail-to-rail opamps (6.1 MHz GBW, programmable gain), two analog comparators, and a supply voltage comparator. These peripherals are accessible across multiple GPIO pins and support autonomous triggering via PRS - all confirmed in the EFM32LG390F128-BGA112 datasheet Section 3.2.10 and Electrical Characteristics Chapter 4.