EFM32TG840F8-QFN64T - 32MHz ARM Cortex-M3 Tiny Gecko MCU | Silicon Labs
Référence : EFM32TG840F8-QFN64T ✓ ActifEFM32TG840F8-QFN64T Présentation
A microcontroller (MCU) is a single integrated circuit that bundles a CPU core, memory, and peripherals such as timers, ADCs, communication interfaces and GPIO. The EFM32 hierarchy runs from this general category down to 32-bit MCU -> ARM Cortex-M3 MCU -> energy-efficient 32-bit MCU -> Tiny Gecko family -> EFM32TG840 series. Because an MCU integrates the processor, memory and peripherals on one die, it replaces a discrete processor-plus-support-circuit design and reduces both board area and system power.
Verified device features include an ARM Cortex-M3 core with 32-bit data path at up to 32 MHz clock speed, 8 KB Flash (8K x 8) program memory, 2 KB SRAM, 56 digital I/O pins, two 16-bit general-purpose timers, AES encryption hardware, three operational amplifiers, and support for an 8x20 character LCD segment display. The device is offered in a 64-QFN (9x9 mm) package.
Architecturally, the Tiny Gecko platform prioritizes energy efficiency over raw throughput: it combines fast wake-up from energy-saving modes with low active current, which is the defining trade-off of the EFM32 family. At 32 MHz the Cortex-M3 core delivers roughly 32 MIPS of throughput, enough for protocol handling, sensor fusion and simple human-machine-interface logic while keeping active energy low compared with higher-frequency MCUs.
Typical applications include battery-operated sensor nodes, compact industrial monitoring modules, energy-harvesting IoT endpoints, LED and LCD display controllers, wearable health accessories, and low-power metering peripherals. The on-chip AES block and operational amplifiers reduce the need for external components in secure and analog front-end designs.
When designing around this part, keep the 8 KB Flash limit in mind: it fits compact protocol stacks and simple user code, but not large connectivity stacks. Decoupling and layout guidance in the manufacturer datasheet should be followed to keep analog channels and the LCD segment outputs noise-free.
This page consolidates distributor pricing, verified device specifications, drop-in same-package alternatives and practical design notes in one place, so engineers can source and qualify the EFM32TG840F8-QFN64T without digging through multiple catalog listings.
Alternatives de remplacement direct pour EFM32TG840F8-QFN64T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec EFM32TG840F8-QFN64T (même facteur de forme et même empreinte) — différant par Package, Low-Power Features, Flash Memory, Series, Product Type.
EFM32TG840F16-QFN64T
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EFM32TG840F32-QFN64T
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EFM32TG840F64-QFN64T
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EFM32TG230F8-QFN64T
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →EFM32WG840F64-QFN64T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
EFM32TG840F8-QFN64T Valeurs maximales et caractéristiques électriques
| Core | ARM Cortex-M3, 32-bit |
| Maximum CPU Frequency | 32 MHz |
| Flash Memory | 8 KB (8K x 8) |
| RAM | 2 KB |
| Digital I/O Pins | 56 |
| Timers | 2 x 16-bit general-purpose timers |
| LCD Controller | Supports 8 x 20 character LCD |
| Security | AES hardware encryption accelerator |
| Operational Amplifiers | 3 on-chip op-amps |
| Boîtier | 64-QFN (9x9 mm) |
| Type de montage | Surface Mount |
| Series | EFM32 Tiny Gecko |
Guide de configuration des broches du EFM32TG840F8-QFN64T 64-qfn (9x9 mm)
Configuration des broches du EFM32TG840F8-QFN64T (boîtier 64-qfn (9x9 mm)). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour EFM32TG840F8-QFN64T.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
EFM32TG840F8-QFN64T convient pour 6 applications: Battery-Powered IoT Sensor Nodes, Secure Connected Metering and Energy Measurement, Industrial Sensor Hubs and Condition Monitoring, LCD Instrument Panels and Handheld Meters, Wearable Health and Activity Trackers, Energy-Harvesting and Remote Telemetry Terminals.
Battery-Powered IoT Sensor Nodes
The EFM32TG840F8-QFN64T fits duty-cycled wireless sensor nodes because the Tiny Gecko platform combines low active current with fast wake-up from its energy-saving modes, cutting the wake-up latency that dominates battery life in intermittent sensing. The 8 KB Flash and 2 KB RAM are sufficient for acquisition, filtering and short message formatting without an external memory device. The 56 digital I/O pins let one device monitor multiple digital sensors and wake sources directly, while the on-chip AES accelerator offloads link encryption from the 32 MHz Cortex-M3 core so the radio spends less time powered.
Recommandé
Secure Connected Metering and Energy Measurement
For smart meters and energy-monitoring modules, the EFM32TG840F8-QFN64T provides the three on-chip operational amplifiers needed to condition low-level current and voltage signals without external analog front-end parts. The integrated AES hardware accelerates symmetric encryption for authenticated data upload, cutting CPU cycles during handshake and payload protection, which is critical when the radio duty cycle dominates the power budget. At 32 MHz the Cortex-M3 core handles measurement math, calibration tables and a communication stack within the 8 KB Flash limit when the protocol is kept compact.
Recommandé
Industrial Sensor Hubs and Condition Monitoring
The EFM32TG840F8-QFN64T suits industrial vibration and condition-monitoring hubs that aggregate several sensor channels and report over a serial link. The 56 digital I/O pins support multiple discrete sensors, switches and alarm lines without external I/O expanders, and the two 16-bit timers provide accurate interval timing and PWM generation for excitation and sampling. Operating from a 24 V industrial rail, the device can sit behind a buck stage and take advantage of its fast wake-up to service periodic data collection without keeping the analog front end continuously powered.
Recommandé
LCD Instrument Panels and Handheld Meters
The EFM32TG840F8-QFN64T integrates an LCD controller capable of driving an 8 x 20 character display, which is typical of handheld meters, bench instruments and simple operator panels. Driving the character LCD directly removes the cost and area of an external display driver, and the remaining GPIO can be shared with a keypad matrix, alarm buzzer or status LEDs. At 32 MHz with 2 KB RAM, screen refresh and measurement algorithms run comfortably, and the low-power platform extends instrument life in the field.
Recommandé
Wearable Health and Activity Trackers
Wearable trackers require long standby time between motion or biometric events, and the EFM32TG840F8-QFN64T offers the energy-saving modes and rapid wake-up needed for that duty cycle. The 3 integrated operational amplifiers can bias sensor inputs such as photodiode or bioimpedance front ends, removing separate analog chips and reducing board area in a space-constrained enclosure. The 56 GPIO pins support multiple sensor axes, and the AES block keeps health data encrypted locally before transmission.
Recommandé
Energy-Harvesting and Remote Telemetry Terminals
Remote telemetry terminals built on harvested energy must spend as little energy as possible on non-essential activity, and the EFM32TG840F8-QFN64T supports deep-sleep operation with fast wake-up. The fast start reduces the energy lost during wake-up transients, a major contributor in energy-harvesting designs, and the low 32 MHz active current keeps computation efficient while a sensor reads and transmits. The 8 KB Flash and 2 KB RAM suit compact store-and-forward payloads, and the AES hardware protects telemetry frames without external crypto components.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour EFM32TG840F8-QFN64T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | EFM32TG840F16-QFN64T | EFM32TG840F32-QFN64T | EFM32TG840F64-QFN64T | EFM32TG230F8-QFN64T | EFM32WG840F64-QFN64T |
|---|---|---|---|---|---|---|
| Package | QFN-64 (9x9 mm) | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| CPU Core | ARM Cortex-M3, 32-bit | ARM Cortex-M3, 32-bit | ARM Cortex-M3, 32-bit | ARM Cortex-M3, 32-bit | ARM Cortex-M3, 32-bit | ARM Cortex-M3, 32-bit |
| Flash Memory | 8 KB (8K x 8) | 16 KB (+100%) | 32 KB (+300%) | 64 KB (+700%) | 8 KB (same) | 64 KB (+700%) |
Principaux différenciateurs
- Integrated analog and security peripherals reduce external component count (vs EFM32TG230F8-QFN64T)
- Same footprint, eight times the Flash headroom when needed (vs EFM32TG840F8-QFN64T)
- Large GPIO count with LCD and timer resources on one die (vs EFM32TG230F8-QFN64T)
Notes de conception
Estimated: at a 3.3 V supply and 5 mA average operating current, the EFM32TG840F8-QFN64T dissipates roughly 16.5 mW in active mode, while the dominant battery cost in a duty-cycled design is the wake-up transient rather than steady-state active current. Choose the lowest energy-saving mode that still meets the response-time requirement, and keep the device in its deepest sleep for as much of the cycle as possible. Because the Tiny Gecko platform is explicitly designed for fast wake-up, tightening the wake source list to only genuinely needed peripherals can cut average current substantially.
Follow the layout and decoupling guidance in the manufacturer EFM32TG840 datasheet: place the bulk and high-frequency decoupling capacitors close to the supply pins, and keep the exposed center pad of the 64-QFN 9x9 mm package tied to ground with a full thermal-via array. The 64-pin QFN has a fine 0.5 mm pitch, so use a land pattern matched to the datasheet footprint drawing rather than a generic QFN library entry, and verify paste stencil aperture ratios to avoid bridging on the inner rows.
The 8 KB Flash limit is the most common design trap. Code that includes a large protocol stack, TLS or a display library will not fit, so estimate the image size early and consider EFM32TG840F16, F32 or F64 in the identical footprint if more room is needed. Also avoid assuming the three on-chip operational amplifiers are ideal: their input common-mode range, output swing and noise figure are limited, so they suit sensor biasing and light analog conditioning, not precision instrumentation-grade signal paths.
The EFM32TG840F8-QFN64T combines fast GPIO edge rates at 32 MHz with on-chip analog amplifiers and an LCD segment driver in the same package. If LCD segment outputs or op-amp inputs run close to sensitive sensor lines, route them away from the analog nets and keep the ground plane continuous under the device. When driving long LCD or keypad traces, add series damping resistors to limit edge ringing, and check emissions against the EMC standard that applies to your end product.
Informations de conformité
No explicit compliance statements were present in the retrieved distributor or manufacturer page snippets. RoHS, REACH, AEC-Q100 qualification and halogen-free status must be confirmed from the manufacturer product page declaration or the distributor parameter table before release to production.
