ATMEGA8535L-8MI - 8-bit AVR MCU, 8KB Flash, 44-QFN | Microchip
Référence : ATMEGA8535L-8MI ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.85 | $38,50 |
| 100 | $3.4 | $340,00 |
| 500 | $3.05 | $1 525,00 |
| 1 000 | $2.75 | $2 750,00 |
ATMEGA8535L-8MI Présentation
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in which most of its 130 instructions execute in a single clock cycle, making the AVR family a cornerstone of embedded control alongside other 8-bit families such as PIC16 and 8051 derivatives. Microcontrollers of this class integrate program memory, data memory, peripherals, and CPU in one chip, sitting at the device level of the broader embedded systems hierarchy.
Key features include up to 16 MIPS throughput at 16 MHz (this L-variant operates up to 8 MHz across a 2.7V-5.5V supply), three flexible Timer/Counters with compare modes, a programmable USART, a byte-oriented Two-wire Serial Interface (TWI/I2C), an SPI serial port, and 32 general purpose I/O lines. The 8-channel 10-bit ADC directly interfaces analog sensors without external conversion hardware.
The AVR core uses fully static operation and advanced RISC architecture with 32 general purpose working registers, allowing C-compiler-friendly code density and deterministic execution. Self-programming Flash enables in-field firmware updates, while the Read-While-Write capability lets the bootloader write program memory without stalling execution. Brown-out detection, internal RC oscillator options, and multiple sleep modes support low-power, battery-conscious designs.
Typical applications include industrial sensor nodes using the 8-channel ADC, motor control and HVAC boards using Timer/Counter PWM, and legacy systems where the ATMEGA8535 is pin compatible with the AT90S8535 for PCB drop-in upgrades.
Design tip: the MLF exposed pad must be soldered to a grounded PCB land for thermal and ground integrity, and fuse configuration (clock source, brown-out, S8535C compatibility mode) must be programmed before relying on AT90S8535 migration behavior.
This page synthesizes distributor stock data, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA8535L-8MI — 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 ATMEGA8535L-8MI (même facteur de forme et même empreinte) — différant par Package, Instruction Set, Program Memory Size, Program Memory Type, SRAM.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA8535L-8MUR
✅ Remplacement direct✓ En stock
$1.05 / unité
Voir la fiche technique →ATMEGA8535-16MI
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.35 / unité
Voir la fiche technique →ATMEGA8535L-8MU
✅ Remplacement direct✓ En stock
$3.95 / unité
Voir la fiche technique →ATMEGA8535L-8MI Valeurs maximales et caractéristiques électriques
| Core Architecture | 8-bit AVR RISC |
| Flash Program Memory | 8 KB In-System Programmable |
| SRAM | 512 bytes |
| EEPROM | 512 bytes |
| Maximum CPU Frequency | 8 MHz (L-version) |
| Peak Throughput | up to 16 MIPS at 16 MHz (family) |
| Supply Voltage Range | 2.7 V to 5.5 V (3 V per Mouser listing) |
| ADC | 8-channel 10-bit |
| General Purpose I/O | 32 lines |
| Timers | 3 Timer/Counters with compare modes |
| Serial Interfaces | USART, TWI (I2C), SPI |
| Interrupts | Internal and external interrupts |
| Instruction Set | 130 instructions, most single-cycle |
| Working Registers | 32 general purpose |
| Boîtier | 44-pin VFQFN/MLF with exposed pad |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C (industrial, I-suffix) |
| Pin Compatibility | Pin compatible with AT90S8535 |
Guide de configuration des broches du ATMEGA8535L-8MI 44-pin vfqfn/mlf with exposed pad
Configuration des broches du ATMEGA8535L-8MI (boîtier 44-pin vfqfn/mlf with exposed pad). 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 ATMEGA8535L-8MI.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA8535L-8MI convient pour 6 applications: Industrial Multi-Channel Sensor Acquisition, Legacy AT90S8535 Board Upgrades, Motor Control and PWM Actuation, Battery-Powered Portable Instruments, Embedded Communication Nodes, Consumer Appliance Control Panels.
Industrial Multi-Channel Sensor Acquisition
The ATMEGA8535L-8MI fits industrial sensor acquisition nodes because its on-chip 8-channel 10-bit ADC eliminates external converter ICs while its 2.7V-5.5V supply range tolerates noisy factory 5V rails. Each ADC channel can be multiplexed across temperature, pressure, and level sensors sampled under Timer/Counter control for deterministic scan timing. The 512-byte SRAM buffers channel data, and the TWI bus offloads storage or display peripherals. Because the AVR core executes most of its 130 instructions in a single cycle at 8 MHz, conversion sequencing and threshold decisions run with microsecond latency. The 44-pin MLF exposed-pad package provides low-inductance grounding that improves ADC noise performance when the pad is solidly soldered to a ground plane, which is essential for achieving full 10-bit accuracy in electrically noisy industrial cabinets.
Recommandé
Legacy AT90S8535 Board Upgrades
For OEMs maintaining installed AT90S8535-based equipment, the ATMEGA8535L-8MI is the sanctioned migration path: the Microchip datasheet explicitly states ATmega8535 is pin compatible with AT90S8535 and can replace it on current printed circuit boards. Because the footprint, pinout, and peripheral set (USART, TWI, SPI, 8-channel ADC, three timers) carry over, no PCB respin is required. Engineers must, however, reprogram fuse bits and evaluate the S8535C fuse for AT90S8535 Compatibility Mode, since fuse locations and some electrical characteristics differ between the devices. The L-grade's 2.7V-5.5V range also adds supply-tolerance margin over the legacy part. This combination of drop-in physical compatibility with firmware-level attention points makes the part the standard choice for end-of-life service replacements and long-lifecycle industrial equipment support.
Recommandé
Motor Control and PWM Actuation
The three flexible Timer/Counters with compare modes make the ATMEGA8535L-8MI well suited to PWM motor control and actuator driving in appliances, HVAC dampers, and small robotics. Two 8-bit timers plus one 16-bit timer support phase-correct and fast PWM modes at carrier frequencies up to the 8 MHz clock limit, while compare-match interrupts implement closed-loop speed regulation from the ADC-sampled feedback. The 32 GPIO lines drive H-bridge enable inputs and limit switches directly. Operating from 2.7V-5.5V allows the MCU to share the gate-drive rail or run from a separate logic supply with simple level consideration. The fully static core maintains state during power-saving pauses between control cycles, and the MLF package's exposed pad grounds switching noise, reducing spurious ADC readings from motor current ripple in shared-ground designs.
Recommandé
Battery-Powered Portable Instruments
Portable measurement instruments benefit from the ATMEGA8535L-8MI's 2.7V-5.5V supply range, internal RC oscillator option, and multiple sleep modes, allowing operation directly from three alkaline cells or a single lithium cell via a small LDO. The integrated 8-channel 10-bit ADC digitizes sensor front ends, the USART streams results to a PC or radio module, and the TWI bus interfaces real-time clocks and EEPROM for data logging in the on-chip 512-byte EEPROM. Duty-cycled operation - sleeping in power-down between periodic conversions - dominates battery life, since the static core retains register state without clocking. Designers should use the internal oscillator at low speeds to minimize active current and reserve the 8 MHz crystal option for compute-heavy bursts. The compact 44-pin MLF footprint suits handheld enclosure constraints where through-hole or larger QFP packages will not fit.
Recommandé
Embedded Communication Nodes
With a hardware USART, a byte-oriented Two-wire Serial Interface, and an SPI port, the ATMEGA8535L-8MI serves as a protocol gateway in RS-485 fieldbus nodes, I2C sensor hubs, and SPI peripheral controllers. The USART with its baud-rate generator links to Modbus RTU transceivers, TWI addresses up to dozens of slave sensors, and SPI services external flash or RF modules - all concurrently because the peripherals operate independently of the CPU once configured. The 8 KB self-programming Flash accommodates compact protocol stacks, and Read-While-Write operation lets a bootloader receive new firmware over the communication link without service interruption. The 8 MHz L-grade provides sufficient headroom for 115200-baud UART service and 400 kHz TWI operation, while the 2.7V-5.5V range matches both 3.3V radio modules and 5V industrial transceivers through appropriate level design.
Recommandé
Consumer Appliance Control Panels
Appliance control boards - washers, cooktops, climate controllers - use the ATMEGA8535L-8MI to combine button scanning on its 32 GPIO lines, ADC-based temperature sensing (NTC thermistors on the 8-channel ADC), and TWI-connected display drivers in a single low-cost MCU. The 8 KB Flash holds both application logic and calibration tables stored in the 512-byte EEPROM across power cycles. The 2.7V-5.5V supply tolerance rides through mains-supply sag events, and brown-out protection available in the family prevents corrupted EEPROM writes during brownouts. The 44-pin MLF exposed-pad package reflows on standard SMT lines and its ground pad improves EMI behavior relevant to consumer EMC compliance. For cost-revised appliance platforms, the same-footprint ATMEGA8535L-8MUR reel option supports high-volume automated placement with identical firmware.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA8535L-8MI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA8535L-8MUR | ATMEGA8535-16MI | ATMEGA8535L-8MU |
|---|---|---|---|---|
| Package | 44-pin VQFN/MLF exposed pad | 44-pin VQFN/MLF exposed pad - same | 44-pin VQFN/MLF exposed pad - same | 44-pin VQFN/MLF exposed pad - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max CPU Frequency | 8 MHz | 8 MHz | 16 MHz | 8 MHz |
| Flash / SRAM / EEPROM | 8 KB / 512 B / 512 B | 8 KB / 512 B / 512 B | 8 KB / 512 B / 512 B | 8 KB / 512 B / 512 B |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Principaux différenciateurs
- Low-voltage 8 MHz operation across 2.7V-5.5V (vs ATMEGA8535-16MI)
- Reel-ready production variant (vs ATMEGA8535L-8MUR)
- Documented legacy migration path (vs AT90S8535 (obsolete))
Notes de conception
The 44-pin MLF package includes a large exposed pad on the underside that is the primary ground connection. It must be soldered to a grounded PCB land pattern - a windowed via array (3x3 or larger) in the pad connected to the ground plane provides both reliable attachment and low-inductance grounding. Poor exposed-pad soldering is the most common MLF assembly defect and directly degrades ADC accuracy and EMC performance. Use a stencil aperture pattern of roughly 50-70% coverage with paste on the pad to avoid voiding and floating the die.
When migrating from AT90S8535, do not assume identical fuse behavior: the Microchip datasheet states that fuse bit locations and electrical characteristics differ, and the S8535C fuse enables AT90S8535 Compatibility Mode. Verify clock source fuses (external crystal vs internal RC) before first power-up - a wrong clock fuse selection can brick access to ISP programming, requiring high-voltage parallel programming for recovery. Also confirm brown-out detector threshold settings against your supply rail before enabling EEPROM writes.
Place a 100 nF ceramic decoupling capacitor directly across VCC/GND at each supply pin pair, plus a bulk 10 uF capacitor near the device. Route ADC reference inputs with a dedicated filtered supply or RC filter to reach full 10-bit accuracy; switching loads on adjacent GPIO during conversions will couple noise into the ADC. The 2.7V-5.5V operating range of this L-grade allows direct 3.3V operation, but verify peripheral timing margins - maximum guaranteed frequency scales with supply voltage in the AVR family.
Informations de conformité
Compliance status not explicitly stated in the provided verified web data; request manufacturer compliance documentation. Modern Microchip AVR production is typically RoHS-compliant, but this must be confirmed via official documentation.
