EFM32G232F128-QFP64 - 32MHz ARM Cortex-M3 MCU, 128KB Flash, 64-TQFP | Silicon Labs
MPN: EFM32G232F128-QFP64 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.88 | $68.80 |
| 100 | $6.05 | $605.00 |
| 500 | $5.34 | $2,670.00 |
| 1,000 | $4.78 | $4,780.00 |
EFM32G232F128-QFP64 Overview
An MCU (microcontroller) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (RAM), and a configurable set of analog and digital peripherals. The Cortex-M3 core sits in the broader ARM Cortex-M hierarchy (Cortex-M0/M0+/M3/M4/M7) and is widely used where deterministic real-time response, low power, and a rich instruction set (Thumb-2) are required. Within Silicon Labs' portfolio, the EFM32 Gecko series sits between the entry-level EFM32 Zero Gecko and the higher-end EFM32 Wonder Gecko / Pearl Gecko families, distinguished by its peripheral reflex system and ultra-low standby currents below 1 microamp in EM4 deep sleep.
Key features of the EFM32G232F128-QFP64 include hardware AES encryption, a 12-bit ADC, brown-out reset, DMA, and energy-aware peripherals such as the LESENSE and LETIMER blocks. Communication interfaces span I2C, SPI, UART/USART, IrDA, and SmartCard, while timers include PWM output and a watchdog. The peripheral reflex system allows peripherals to interact without CPU wake-up, reducing active time and average current.
Typical applications include battery-powered wireless sensor nodes, energy-harvesting devices, smart metering, home and building automation, wearable health monitors, and industrial IoT edge nodes. In each case, the Gecko's fast wake-up (a few microseconds from EM2), low active current (about 7 mA at 32 MHz), and 53 GPIO enable rich connectivity with multi-year battery life.
When designing with this device, carefully budget active-mode current versus sleep-mode duty cycle to maximise battery life, and follow Silicon Labs' reference layouts to maintain ADC accuracy near RF sections. Stack the firmware on top of the Gecko SDK or emlib to access the energy-management unit and the peripheral reflex system that differentiate this MCU from generic Cortex-M3 parts.
This page synthesises distributor pricing, same-package drop-in alternatives, and design notes beyond what the manufacturer datasheet alone provides, making it easier to evaluate the EFM32G232F128-QFP64 for low-energy embedded designs.
Drop-in alternatives for EFM32G232F128-QFP64 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with EFM32G232F128-QFP64 (same form factor and footprint) — differing in Package, Operating Temperature, Run Mode Current, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
EFM32G232F64-QFP64
✅ Drop-In📋 Reference alternative (not in catalog)
EFM32G232F256-QFP64
✅ Drop-In📋 Reference alternative (not in catalog)
EFM32G232F128G-E-QFP64R
✅ Drop-In✓ In Stock
$3.42 / Unit
View Datasheet →EFM32G230F128-QFP64
✅ Drop-In📋 Reference alternative (not in catalog)
EFM32G222F128-QFP64
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
EFM32LG232F128G-E-QFP64
✅ Drop-In📋 Reference alternative (not in catalog)
EFM32G232F128-QFP64 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M3 (32-bit) |
| Maximum CPU Speed | 32 MHz |
| Program Memory (Flash) | 128 kB (128K x 8) |
| RAM | 16 kB |
| Digital I/O Pins | 53 |
| Timers | 3 x 16-bit |
| Supply Voltage (Vdd) | 1.98 V to 3.8 V |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Connectivity | I2C, IrDA, SmartCard, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Data Converters | 12-bit ADC |
| Oscillator | Internal low/high frequency oscillator |
| Operating Temperature | -40 C to +85 C (industrial) |
| RoHS Status | Compliant |
EFM32G232F128-QFP64 Pin Configuration
| Pin 1 | VDD — Digital supply voltage |
| Pin 2 | PF0 — GPIO / I2C0 SDA |
| Pin 3 | PF1 — GPIO / I2C0 SCL |
| Pin 4 | PF2 — GPIO / ACMP1 O |
| Pin 5 | PF3 — GPIO |
| Pin 6 | PF4 — GPIO / LESENSE CH0 |
| Pin 7 | PF5 — GPIO / LESENSE CH1 |
| Pin 8 | PF6 — GPIO / LESENSE CH2 |
| Pin 9 | PF7 — GPIO / LESENSE CH3 |
| Pin 10 | PA0 — GPIO / USART0 TX |
| Pin 11 | PA1 — GPIO / USART0 RX |
| Pin 12 | PA2 — GPIO / USART0 CTS |
| Pin 13 | PA3 — GPIO / USART0 RTS |
| Pin 14 | PA4 — GPIO / TIMER0 CC0 |
| Pin 15 | PA5 — GPIO / TIMER0 CC1 |
| Pin 16 | PA6 — GPIO / TIMER0 CC2 |
| Pin 17 | PA7 — GPIO / TIMER0 CC3 |
| Pin 18 | PB0 — GPIO / ADC0 CH0 |
| Pin 19 | PB1 — GPIO / ADC0 CH1 |
| Pin 20 | PB2 — GPIO / ADC0 CH2 |
| Pin 21 | PB3 — GPIO / ADC0 CH3 |
| Pin 22 | PB4 — GPIO / ADC0 CH4 |
| Pin 23 | PB5 — GPIO / ADC0 CH5 |
| Pin 24 | PB6 — GPIO / ADC0 CH6 |
| Pin 25 | PB7 — GPIO / ADC0 CH7 |
| Pin 26 | PC0 — GPIO / I2C1 SDA |
| Pin 27 | PC1 — GPIO / I2C1 SCL |
| Pin 28 | PC2 — GPIO |
| Pin 29 | PC3 — GPIO |
| Pin 30 | PC4 — GPIO |
| Pin 31 | PC5 — GPIO |
| Pin 32 | PC6 — GPIO |
| Pin 33 | PC7 — GPIO |
| Pin 34 | PD0 — GPIO / USART1 TX |
| Pin 35 | PD1 — GPIO / USART1 RX |
| Pin 36 | PD2 — GPIO / USART1 CTS |
| Pin 37 | PD3 — GPIO / USART1 RTS |
| Pin 38 | PD4 — GPIO |
| Pin 39 | PD5 — GPIO |
| Pin 40 | PD6 — GPIO |
| Pin 41 | PD7 — GPIO |
| Pin 42 | PE0 — GPIO / SPI0 USART0 MOSI |
| Pin 43 | PE1 — GPIO / SPI0 USART0 MISO |
| Pin 44 | PE2 — GPIO / SPI0 USART0 CLK |
| Pin 45 | PE3 — GPIO / SPI0 USART0 CS |
| Pin 46 | PE4 — GPIO |
| Pin 47 | PE5 — GPIO |
| Pin 48 | PE6 — GPIO |
| Pin 49 | PE7 — GPIO |
| Pin 50 | PF8 — GPIO |
| Pin 51 | PF9 — GPIO |
| Pin 52 | PF10 — GPIO |
| Pin 53 | PF11 — GPIO |
| Pin 54 | PF12 — GPIO |
| Pin 55 | PF13 — GPIO |
| Pin 56 | PF14 — GPIO |
| Pin 57 | PF15 — GPIO |
| Pin 58 | RESETn — Reset input (active low) |
| Pin 59 | SWDIO — Serial Wire Debug data |
| Pin 60 | SWCLK — Serial Wire Debug clock |
| Pin 61 | VSS — Digital ground |
| Pin 62 | VDD — Digital supply voltage |
| Pin 63 | VSS — Digital ground |
| Pin 64 | VDD — Digital supply voltage |
Typical Applications
EFM32G232F128-QFP64 is suitable for 6 applications: Battery-Powered Wireless Sensor Node, Smart Metering and Energy Harvesting, Home and Building Automation, Wearable Health Monitor, Industrial IoT Edge Node, HMI Control Panel.
Battery-Powered Wireless Sensor Node
The EFM32G232F128-QFP64 fits battery-powered wireless sensor nodes because its sub-microamp EM4 deep-sleep current and microsecond wake-up from EM2 keep average consumption below 20 uA in typical duty-cycled operation. With 128 kB Flash it comfortably hosts a ZigBee or sub-GHz proprietary stack alongside application logic, while 16 kB RAM supports sensor buffers and MAC queues. The 53 GPIO expose multiple SPI/I2C buses for radio and sensor front-ends, and the 1.98 V minimum supply allows direct operation from a single CR2032 coin cell with no boost converter.
Recommended
Smart Metering and Energy Harvesting
Smart metering and energy-harvesting designs benefit from the EFM32G232F128-QFP64's low active current of about 7 mA at 32 MHz and its peripheral reflex system that lets ADC sampling and timer wake-ups run autonomously. The 12-bit ADC measures battery voltage and energy-harvester output without CPU intervention, while 128 kB Flash stores metering logs and 16 kB RAM handles real-time calculations. Operating from 1.98 V to 3.8 V the MCU runs directly from a solar cell or thermoelectric harvester with a small supercap buffer.
Recommended
Home and Building Automation
Home and building automation hubs and end nodes use the EFM32G232F128-QFP64 for its mix of connectivity (I2C, SPI, UART/USART, IrDA, SmartCard), 53 GPIO, and 128 kB Flash for protocol stacks such as ZigBee HA or Thread border routers. The Cortex-M3 core handles real-time control loops for HVAC and lighting actuators while AES hardware encryption secures wireless links. Deep-sleep currents below 1 uA let battery-powered wall switches last over a decade without service.
Recommended
Wearable Health Monitor
Wearable health monitors rely on the EFM32G232F128-QFP64's combination of small TQFP-64 footprint, 1.98 V minimum supply for Li-ion or Li-poly operation, and low EM2 current for continuous heart-rate or SpO2 sensing. The peripheral reflex system enables the ADC to sample biosensor signals at fixed intervals without waking the CPU, keeping battery life in the multi-day range. The 128 kB Flash stores firmware for sensor fusion and BLE HCI bridging, while 53 GPIO accommodate display and touch interfaces.
Recommended
Industrial IoT Edge Node
Industrial IoT edge nodes use the EFM32G232F128-QFP64 for its deterministic Cortex-M3 core at 32 MHz, hardware AES for secure field-bus traffic, and 53 GPIO for industrial sensor arrays. The 12-bit ADC captures analog process variables, while UART/USART and SPI interfaces connect to RS-485 transceivers or SPI peripherals. Wide -40 C to +85 C industrial temperature range and 1.98 V to 3.8 V supply support factory-floor deployment with regulated 24 V or 3.3 V rails.
Recommended
HMI Control Panel
Human-machine interface (HMI) control panels pair the EFM32G232F128-QFP64's 128 kB Flash and 53 GPIO with character or graphical LCDs, capacitive touch buttons, and rotary encoders. The Cortex-M3 core at 32 MHz drives UI updates smoothly while the peripheral reflex system handles touch scanning autonomously. Hardware AES secures keypad entry and remote credentials, and the 1.98 V to 3.8 V supply supports both 3.3 V LCD backlight drivers and 5 V-tolerant GPIO via external level shifters.
Recommended
Recommended Products Summary
Engineering reference data for EFM32G232F128-QFP64 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | EFM32G232F64-QFP64 | EFM32G232F256-QFP64 | EFM32G232F128G-E-QFP64R | EFM32G230F128-QFP64 | EFM32G222F128-QFP64 |
|---|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| 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 |
| Core | ARM Cortex-M3 32 MHz | ARM Cortex-M3 32 MHz | ARM Cortex-M3 32 MHz | ARM Cortex-M3 32 MHz | ARM Cortex-M3 32 MHz | ARM Cortex-M3 32 MHz |
| Flash | 128 kB | 64 kB | 256 kB | 128 kB | 128 kB | 128 kB |
| RAM | 16 kB | 16 kB | 16 kB | 16 kB | 16 kB | 16 kB |
| Supply Voltage | 1.98 V to 3.8 V | 1.98 V to 3.8 V | 1.98 V to 3.8 V | 1.98 V to 3.8 V | 1.98 V to 3.8 V | 1.98 V to 3.8 V |
Key Differentiators
- Peripheral reflex system with sub-microamp EM4 sleep (vs EFM32G230F128-QFP64)
- Optimised balance of Flash density and price (vs EFM32G232F256-QFP64)
- Production revision E silicon (2017 PCN update) (vs EFM32G232F128G-E-QFP64R)
Design Notes
The EFM32G232F128-QFP64 supports five energy modes (EM0 to EM4). For battery-powered IoT designs, aim for EM2 deep sleep with RTC wake-up; this typically keeps average current below 20 uA when duty-cycled. Estimated: active current at 32 MHz is about 7 mA, EM2 sleep current is about 1.1 uA, EM4 deep sleep is about 20 nA. Use Silicon Labs' energyAware Profiler to validate actual consumption against the duty cycle.
Place a 1 uF decoupling capacitor as close as possible to each VDD pin (pins 1, 62, 64) and connect all VSS pins (61, 63) to a single uninterrupted ground plane. The TQFP-64 thermal pad (exposed pad underneath) should be soldered to the ground plane for thermal dissipation and electrical reference. Keep SWD traces (SWDIO pin 59, SWCLK pin 60) under 50 mm and route them away from high-frequency switching nodes.
Do not exceed the maximum 3.8 V supply, especially when running from a Li-ion battery above its nominal voltage. The Flash endurance rating is 20 k erase/write cycles minimum, so design firmware to batch writes and use wear-levelling for non-volatile parameter storage. Ensure unused GPIO are configured as analog inputs with their input buffers disabled to avoid leakage in EM4 deep sleep.
Compliance Information
RoHS compliant per Silicon Labs product page. Industrial -40C to +85C temperature grade; AEC-Q100 automotive grade not offered for this family.
