ATMEGA8535L-8AU - 8-bit AVR MCU 8KB Flash 44-TQFP | Microchip
MPN: ATMEGA8535L-8AU ✓ AktifATMEGA8535L-8AU Ringkasan
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters. Within the semiconductor taxonomy, the ATMEGA8535L-8AU sits in the hierarchy of 8-bit MCU -> microcontroller -> embedded processor -> integrated circuit, and it belongs to the AVR ATmega family, which is known for its single-cycle RISC execution and deterministic interrupt latency.
Key features include 8 KB Flash (4K x 16), 512 B SRAM, 512 B EEPROM, 32 programmable I/O lines, two 8-bit and one 16-bit timer/counter, a 4-channel PWM unit, an 8-channel 10-bit ADC, a programmable USART, a master/slave SPI, and a byte-oriented two-wire serial interface (I2C). The device delivers up to 8 MIPS at 8 MHz and supports six sleep modes for low-power operation.
The ATmega8535L core uses the enhanced AVR RISC architecture with 130 powerful instructions, most executing in a single clock cycle. The 'L' suffix denotes the low-voltage version, which operates from 2.7 V to 5.5 V and is speed-graded to 8 MHz, while the standard ATmega8535 runs at 4.5-5.5 V and up to 16 MHz. This makes the L-grade part attractive for battery-powered and 3.3 V mixed-supply designs.
Typical applications include industrial control panels, battery chargers, motor control, home appliances, sensor interfaces, and legacy 8-bit embedded designs that require a proven, well-documented AVR core with generous I/O count. The 44-TQFP package offers a compact 10x10 mm footprint suitable for space-constrained boards.
When designing with this device, ensure the supply is decoupled with a 100 nF ceramic capacitor close to each VCC pin, and note that the internal RC oscillator is factory-calibrated to +/-3% at 8 MHz, which may be adequate for many applications without an external crystal. The ATmega8535L is a mature, active-lifecycle part with extensive third-party toolchain support.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection, replacement, and layout decisions.
Alternatif penggantian untuk ATMEGA8535L-8AU — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian ATMEGA8535L-8AU (sama faktor bentuk dan footprint) — berbeda di dalam Package, ADC, Serial Interfaces, Instruction Set, Maximum Clock Frequency.
ATMEGA8535L-8AUR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
ATMEGA8535-16AU
✅ Drop-InKontak untuk harga
Lihat Datasheet →ATMEGA8535L-8MU
✅ Drop-InKontak untuk harga
Lihat Datasheet →ATMEGA8535L-8AUR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
ATMEGA8535-16AUR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
ATMEGA8535L-8AU Rating Maksimal & Karakteristik Listrik
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 8 KB Flash (4K x 16) |
| SRAM | 512 B |
| EEPROM | 512 B |
| Frekuensi Bawah Maximum | 8 MHz (L version) |
| Throughput | 8 MIPS at 8 MHz |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Programmable I/O Lines | 32 |
| ADC | 8-channel, 10-bit |
| Timers | Two 8-bit, one 16-bit |
| PWM Channels | 4 |
| Serial Interfaces | USART, SPI, TWI (I2C) |
| Paket | 44-lead TQFP (10x10 mm) |
| Suhu Kerja | -40C to +85C |
| Instruction Set | 130 instructions, most single-clock |
| Sleep Modes | 6 (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) |
| Internal RC Oscillator | 8 MHz calibrated, +/-3% |
| Tipe Mounting | Surface Mount |
| Status RoHS | Compliant |
| REACH Status | Compliant |
Konfigurasi Pin ATMEGA8535L-8AU
| Pin produk 1 | PB0 — Port B, bit 0 (T0/XCK) |
| Pin produk 2 | PB1 — Port B, bit 1 (T1) |
| Pin produk 3 | PB2 — Port B, bit 2 (INT2/AIN0) |
| Pin produk 4 | PB3 — Port B, bit 3 (OC0/AIN1) |
| Pin produk 5 | PB4 — Port B, bit 4 (SS) |
| Pin produk 6 | PB5 — Port B, bit 5 (MOSI) |
| Pin produk 7 | PB6 — Port B, bit 6 (MISO) |
| Pin produk 8 | PB7 — Port B, bit 7 (SCK) |
| Pin produk 9 | RESET — Reset input (active low) |
| Pin produk 10 | VCC — Digital supply voltage |
| Pin produk 11 | GND — Ground |
| Pin produk 12 | XTAL2 — Crystal oscillator output |
| Pin produk 13 | XTAL1 — Crystal oscillator input |
| Pin produk 14 | PD0 — Port D, bit 0 (RXD) |
| Pin produk 15 | PD1 — Port D, bit 1 (TXD) |
| Pin produk 16 | PD2 — Port D, bit 2 (INT0) |
| Pin produk 17 | PD3 — Port D, bit 3 (INT1) |
| Pin produk 18 | PD4 — Port D, bit 4 (OC1B) |
| Pin produk 19 | PD5 — Port D, bit 5 (OC1A) |
| Pin produk 20 | PD6 — Port D, bit 6 (ICP1) |
| Pin produk 21 | PD7 — Port D, bit 7 (OC2) |
| Pin produk 22 | PC0 — Port C, bit 0 (SCL) |
| Pin produk 23 | PC1 — Port C, bit 1 (SDA) |
| Pin produk 24 | PC2 — Port C, bit 2 (TCK) |
| Pin produk 25 | PC3 — Port C, bit 3 (TMS) |
| Pin produk 26 | PC4 — Port C, bit 4 (TDO) |
| Pin produk 27 | PC5 — Port C, bit 5 (TDI) |
| Pin produk 28 | PC6 — Port C, bit 6 (TOSC1) |
| Pin produk 29 | PC7 — Port C, bit 7 (TOSC2) |
| Pin produk 30 | AVCC — Analog supply voltage |
| Pin produk 31 | GND — Ground |
| Pin produk 32 | AREF — Analog reference voltage |
| Pin produk 33 | PA7 — Port A, bit 7 (ADC7) |
| Pin produk 34 | PA6 — Port A, bit 6 (ADC6) |
| Pin produk 35 | PA5 — Port A, bit 5 (ADC5) |
| Pin produk 36 | PA4 — Port A, bit 4 (ADC4) |
| Pin produk 37 | PA3 — Port A, bit 3 (ADC3) |
| Pin produk 38 | PA2 — Port A, bit 2 (ADC2) |
| Pin produk 39 | PA1 — Port A, bit 1 (ADC1) |
| Pin produk 40 | PA0 — Port A, bit 0 (ADC0) |
| Pin produk 41 | VCC — Digital supply voltage |
| Pin produk 42 | GND — Ground |
| Pin produk 43 | NC — Not connected (per datasheet) |
| Pin produk 44 | NC — Not connected (per datasheet) |
Aplikasi Umum
ATMEGA8535L-8AU cocok untuk 6 aplikasis: Industrial Control Panels, Battery-Powered Sensor Nodes, Home Appliances and White Goods, Motor Control and Drives, Legacy 8-bit Embedded Redesigns, Data Logging and Instrumentation.
Industrial Control Panels
The ATMEGA8535L-8AU fits industrial control panels because its 32 programmable I/O lines and 8-channel 10-bit ADC can directly interface with pushbuttons, relays, and analog sensors without external multiplexing. Operating from 2.7-5.5 V, it tolerates the noisy 5 V rails common in factory equipment, and the 44-lead TQFP's 10x10 mm footprint saves board space in DIN-rail modules. The device's 8 KB Flash holds control logic and lookup tables, while the 512 B EEPROM stores calibration constants across power cycles. A typical implementation uses the USART for an RS-485 or Modbus interface and the 16-bit timer for precise pulse generation. Unlike a 32-bit MCU, the AVR core's deterministic single-cycle execution simplifies worst-case timing analysis, but designers must add external TVS protection on field-facing I/O to survive industrial transients.
Direkomendasikan
Battery-Powered Sensor Nodes
The ATMEGA8535L-8AU is well suited to battery-powered sensor nodes because its 2.7-5.5 V supply range allows direct operation from a single Li-ion cell or two AA cells without a boost converter, and its six sleep modes reduce current to the microamp range between measurements. The 8-channel 10-bit ADC samples thermistors, strain gauges, or photodiodes directly, while the TWI (I2C) interface connects to low-power EEPROM or sensor ICs. In a typical duty-cycled design, the MCU wakes on a timer interrupt, converts a few channels, transmits via USART or SPI, and returns to Power-down mode. The trade-off is that the 8 MHz L-grade core limits throughput, so designers should keep wake-time processing short. Adding a 32.768 kHz watch crystal enables accurate long-interval timing at minimal current.
Direkomendasikan
Home Appliances and White Goods
The ATMEGA8535L-8AU is widely used in home appliances such as washing machines, dishwashers, and microwave ovens because it combines 32 I/O lines, a 10-bit ADC, and hardware PWM in a single 44-lead TQFP, reducing component count on cost-sensitive control boards. The 4-channel PWM unit drives triacs and relays for motor and heater control, while the ADC reads temperature and level sensors. Its 2.7-5.5 V range accommodates the 5 V regulated rail typical of appliance electronics, and the -40C to +85C rating covers the internal temperatures of most white goods. The 8 KB Flash is sufficient for state-machine control logic and safety interlocks. Designers should note that the internal 8 MHz RC oscillator's +/-3% tolerance is adequate for appliance timing but an external crystal is recommended if precise timekeeping is required.
Direkomendasikan
Motor Control and Drives
The ATMEGA8535L-8AU supports motor control applications through its 16-bit timer with input capture, 4-channel PWM, and 8-channel 10-bit ADC, which together enable closed-loop speed and current control of brushed DC and stepper motors. The 8 MIPS throughput at 8 MHz is sufficient for PID loops running at a few kilohertz, and the 32 I/O lines can drive gate drivers, direction pins, and limit switches simultaneously. In a typical design, the ADC samples a shunt resistor for current feedback while the PWM modulates the H-bridge. The main limitation is that the L-grade part's 8 MHz ceiling constrains control-loop bandwidth compared with the 16 MHz ATmega8535-16AU, so high-speed field-oriented control is better served by a dedicated motor-control MCU. Adequate gate-drive isolation and dead-time insertion remain essential.
Direkomendasikan
Legacy 8-bit Embedded Redesigns
The ATMEGA8535L-8AU is a common choice for maintaining and redesigning legacy 8-bit embedded systems because it is an active-lifecycle part with a stable, well-documented AVR core and extensive toolchain support. Engineers migrating from older AT90S8535 or ATmega8535 designs can reuse existing firmware with minimal changes, since the instruction set and peripheral register map are compatible. The 44-lead TQFP footprint matches the original ATmega8535 layout, allowing direct board respins without re-routing. The 2.7-5.5 V range also permits modernization to 3.3 V logic while preserving the same code base. The main consideration is that the L-grade 8 MHz limit may require re-tuning timing loops originally written for 16 MHz operation, and any external crystal must be re-specified accordingly.
Direkomendasikan
Data Logging and Instrumentation
The ATMEGA8535L-8AU is effective in data logging and instrumentation because its 512 B EEPROM stores calibration data and configuration without external memory, while the 8-channel 10-bit ADC digitizes sensor signals and the USART streams results to a host PC or wireless module. The 8 KB Flash accommodates sampling routines, linearization tables, and communication stacks. In a typical logger, the MCU samples at fixed intervals using the 16-bit timer, averages readings to reduce noise, and writes to EEPROM or an external SPI flash. The 2.7-5.5 V supply allows operation from a 3.3 V rail, simplifying interfacing with modern sensors. Designers should account for the 10,000-cycle Flash and 100,000-cycle EEPROM endurance limits when planning write frequency, and use wear-leveling for high-rate logging.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk ATMEGA8535L-8AU — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | ATMEGA8535L-8AUR | ATMEGA8535-16AU | ATMEGA8535L-8MU |
|---|---|---|---|---|
| Package | 44-lead TQFP (10x10 mm) | 44-lead TQFP - same | 44-lead TQFP - same | 44-pad QFN/MLF - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 16 MHz | 8 MHz |
| Operating Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB |
| SRAM | 512 B | 512 B | 512 B | 512 B |
| Programmable I/O Lines | 32 | 32 | 32 | 32 |
| ADC | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit | 8-channel, 10-bit |
| Packaging | Tray | Tape & Reel | Tray | Tray |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferensiator Kunci
- Low-voltage operation down to 2.7 V (vsATMEGA8535-16AU)
- Tape-and-reel availability for automated assembly (vsATMEGA8535L-8AU)
- Compact QFN option with exposed pad (vsATMEGA8535L-8MU)
- Higher speed for 5 V systems (vsATMEGA8535-16AU)
Catatan Desain
Decouple every VCC and AVCC pin with a 100 nF ceramic capacitor placed as close to the pin as possible, and add a 10 uF bulk capacitor near the regulator output. The ATmega8535 datasheet recommends a separate low-pass filter (10 uH inductor plus 100 nF) on AVCC when the ADC is used, to isolate digital switching noise from the analog reference. Keep AREF decoupled with 100 nF to GND. Estimated: at 8 MHz and 5 V, core current is roughly 5-8 mA, so a 100 mA LDO is more than adequate.
Route the crystal and its two load capacitors as close to XTAL1/XTAL2 as possible, keeping the loop area small and away from switching signals. Use a ground guard ring around the crystal. For the 44-lead TQFP, connect the exposed thermal/ground pad (if present) to a solid ground plane with multiple vias. Keep the ISP header traces short and avoid routing them under the crystal or analog pins to prevent programming failures and ADC noise.
Do not exceed the 8 MHz speed grade of the L version; running the ATMEGA8535L-8AU above 8 MHz at 2.7-5.5 V violates the datasheet and causes unreliable Flash access. If migrating firmware from a 16 MHz ATmega8535, re-check all timer prescalers, UART baud rates, and software delay loops. Also verify that the reset pin is pulled high through a 10 kOhm resistor and that the ISP programmer does not hold it low during normal operation.
When using the 10-bit ADC, drive AREF from a clean, low-impedance source (for example a 2.56 V reference or a filtered AVCC) rather than the noisy digital rail. Keep analog input traces short and shielded from digital lines, and place a 100 nF capacitor from each ADC input to GND if the source impedance exceeds 10 kOhm. The datasheet specifies a maximum ADC clock of 200 kHz for full 10-bit accuracy, so set the prescaler accordingly at 8 MHz.
Informasi Konformitas
Distributor compliance data lists the ATMEGA8535L-8AU as EU RoHS compliant, REACH compliant, and DRC conflict-free. Not AEC-Q100 qualified; automotive designs require a separately qualified part.
