ATMEGA8535-16PI - 8-bit AVR MCU 16MHz 8KB Flash | Microchip
N.º da peça: ATMEGA8535-16PI ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.49 | $2,49 |
| 10 | $2.24 | $22,40 |
| 100 | $1.99 | $199,00 |
| 500 | $1.79 | $895,00 |
| 1.000 | $1.65 | $1.650,00 |
ATMEGA8535-16PI Visão geral
An 8-bit AVR microcontroller is a single-chip processor built on the AVR enhanced RISC architecture, in which most of its instructions execute in a single clock cycle. Within the embedded-systems hierarchy, it belongs to the microcontroller unit (MCU) category: CPU, program memory, data memory, timers, serial interfaces, and analog-to-digital conversion integrated onto one die, replacing multi-chip processor-plus-peripheral designs in cost- and size-sensitive control applications.
Key differentiating specifications include up to 16 MIPS throughput at 16 MHz, 130 powerful instructions with mostly single-cycle execution, and 32 general-purpose working registers directly connected to the ALU. The device integrates three flexible timer/counters with compare modes, a programmable serial USART, a byte-oriented Two-wire Serial Interface (I2C-compatible TWI), and an SPI serial port, plus brown-out detection, power-on reset, PWM capability, and a watchdog timer.
Architecturally, the ATmega8535 uses a Harvard-structure AVR core with single-level pipelined instruction fetch, while the Flash program memory supports Read-While-Write self-programming for field firmware updates. The internal 10-bit successive-approximation ADC with 8 multiplexed channels (PA0-PA7) plus an internal bandgap reference input makes external signal-conditioning ICs unnecessary for many sensor tasks. An AT90S8535 compatibility mode, selected by the S8535C fuse, eases migration from the earlier AVR generation.
Typical applications include industrial control and automation panels, motorized motion platforms, HVAC and appliance controllers, and instrumentation front-ends that exploit the 8-channel 10-bit ADC. The 40-pin PDIP package also suits through-hole prototyping, educational boards, and repair of legacy equipment.
Design consideration: the -16PI speed grade requires a 4.5V to 5.5V supply, so it cannot run at 3.3V; plan level shifting for mixed-voltage systems and decouple AVCC/AGND separately for accurate ADC results.
This page synthesizes distributor pricing, drop-in alternative analysis, pinout data, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-09-19.
Alternativas drop-in para ATMEGA8535-16PI — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATMEGA8535-16PI (mesmo formato e footprint) — diferindo em Package, Operating Temperature, Instructions, Communication Interfaces, SRAM.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA8535-16PU
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.05 / unidade
Ver ficha técnica →ATMEGA16-16PI
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.72 / unidade
Ver ficha técnica →ATMEGA32A-PI
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATMEGA8515-16PI
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$4.18 / unidade
Ver ficha técnica →AT90S8535-16PI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATMEGA8535-16PI Classificações máximas e características elétricas
| Core Processor | AVR |
| Core Size | 8-bit |
| Speed | 16 MHz |
| Program Memory Size | 8 KB (4K x 16) Flash |
| Program Memory Type | FLASH (In-System Programmable) |
| RAM Size | 512 x 8 |
| EEPROM Size | 512 x 8 |
| Number of I/O | 32 |
| ADC Channels | 8-channel 10-bit |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Tensão de alimentação | 4.5 V to 5.5 V |
| Encapsulamento | 40-PDIP (0.600 inch, 15.24 mm) |
| Tipo de montagem | Through Hole |
| MIPS Throughput | 16 MIPS at 16 MHz |
| Instructions | 130 powerful instructions, most single-cycle |
| General Purpose Registers | 32 x 8-bit |
| Timer/Counters | Three flexible timer/counters with compare modes |
Configuração de pinos do ATMEGA8535-16PI
| Pino 1 | PB5 (MOSI) — Port B, SPI Master Output Slave Input |
| Pino 2 | PB6 (MISO) — Port B, SPI Master Input Slave Output |
| Pino 3 | PB7 (SCK/UCSK) — Port B, SPI Serial Clock |
| Pino 4 | RESET — Reset input, active low |
| Pino 5 | VCC — Digital supply voltage |
| Pino 6 | GND — Digital ground |
| Pino 7 | XTAL2 — Oscillator amplifier output |
| Pino 8 | XTAL1 — Oscillator amplifier input / external clock |
| Pino 9 | PD0 (RXD) — Port D, USART receive |
| Pino 10 | PD1 (TXD) — Port D, USART transmit |
| Pino 11 | PD2 (INT0) — Port D, external interrupt 0 |
| Pino 12 | PD3 (INT1) — Port D, external interrupt 1 |
| Pino 13 | PD4 (OC1B) — Port D, Timer/Counter1 output compare B / PWM |
| Pino 14 | PD5 (OC1A) — Port D, Timer/Counter1 output compare A / PWM |
| Pino 15 | PD6 (ICP1) — Port D, Timer/Counter1 input capture |
| Pino 16 | PD7 (OC2) — Port D, Timer/Counter2 output compare / PWM |
| Pino 17 | PC0 (SCL) — Port C, TWI serial clock |
| Pino 18 | PC1 (SDA) — Port C, TWI serial data |
| Pino 19 | PC2 (TCK) — Port C, JTAG test clock |
| Pino 20 | PC3 (TMS) — Port C, JTAG test mode select |
| Pino 21 | PC4 (TDO) — Port C, JTAG test data output |
| Pino 22 | PC5 (TDI) — Port C, JTAG test data input |
| Pino 23 | PC6 (TOSC1) — Port C, Timer oscillator input (32.768 kHz) |
| Pino 24 | PC7 (TOSC2) — Port C, Timer oscillator output |
| Pino 25 | AVCC — ADC supply voltage |
| Pino 26 | GND — Ground (ADC) |
| Pino 27 | AREF — ADC analog reference voltage |
| Pino 28 | PA7 (ADC7) — Port A, analog channel 7 / digital I/O |
| Pino 29 | PA6 (ADC6) — Port A, analog channel 6 / digital I/O |
| Pino 30 | PA5 (ADC5) — Port A, analog channel 5 / digital I/O |
| Pino 31 | PA4 (ADC4) — Port A, analog channel 4 / digital I/O |
| Pino 32 | PA3 (ADC3) — Port A, analog channel 3 / digital I/O |
| Pino 33 | PA2 (ADC2) — Port A, analog channel 2 / digital I/O |
| Pino 34 | PA1 (ADC1) — Port A, analog channel 1 / digital I/O |
| Pino 35 | PA0 (ADC0) — Port A, analog channel 0 / digital I/O |
| Pino 36 | PB0 (XCK/T0) — Port B, USART external clock / Timer0 clock |
| Pino 37 | PB1 (T1) — Port B, Timer/Counter1 external clock |
| Pino 38 | PB2 (INT2/AIN0) — Port B, external interrupt 2 / analog comparator positive input |
| Pino 39 | PB3 (OC0/AIN1) — Port B, Timer0 output compare / analog comparator negative input |
| Pino 40 | PB4 (SS) — Port B, SPI slave select |
Aplicações típicas
ATMEGA8535-16PI é adequado para 6 aplicaçãos: Industrial Control and Automation, Motion Control Platforms, Sensor Data Acquisition, Appliance and HVAC Controllers, Legacy Equipment Repair and Maintenance, Education and Prototyping.
Industrial Control and Automation
The ATMEGA8535-16PI fits industrial control panels because its 4.5V to 5.5V tolerance suits legacy 5V industrial rails, its 32 I/O lines drive relays, contactors, and status LEDs directly at 20 mA per pin, and brown-out detection plus a watchdog timer provide the reset integrity demanded by unattended equipment. The 16 MIPS AVR core executes PID loops and sequential logic without an RTOS. In a typical panel, Port A reads analog setpoints via the 8-channel 10-bit ADC while Ports B and D handle keypad scanning and actuator control over TWI or SPI to peripheral expanders. The industrial -40C temperature grade ensures reliability in unheated enclosures.
Recomendado
Motion Control Platforms
Motorized motion platforms, including the well-known AC motor controller community designs, historically used the ATMEGA8535-16PI because its three flexible timer/counters with compare modes generate three independent PWM channels for multi-axis motor drives, while the 8-channel 10-bit ADC reads potentiometer joysticks and current-sense shunts for closed-loop feedback. At 16 MIPS, the AVR core executes the position-estimation math for gyro/accelerometer stabilization in real time. The through-hole 40-pin PDIP package simplifies repair and prototyping on hand-soldered control boards, a decisive factor for hobbyist and service-friendly motion systems that must remain maintainable in the field.
Recomendado
Sensor Data Acquisition
The on-chip 8-channel 10-bit successive-approximation ADC with an internal bandgap reference makes the ATMEGA8535-16PI a compact acquisition front-end for temperature, pressure, and potentiometer arrays: up to eight single-ended analog inputs are multiplexed to Port A (PA0-PA7) without external converter ICs. For accuracy, AVCC should be decoupled and AREF stabilized, and the ADC prescaler set so the ADC clock stays within the datasheet limit for 10-bit resolution. Sampled data is buffered in the 512-byte SRAM and logged to the 512-byte EEPROM or streamed over USART at 16 MHz-clocked baud rates, giving a single-chip data logger for slowly varying industrial signals.
Recomendado
Appliance and HVAC Controllers
White-goods and HVAC control boards benefit from the ATMEGA8535-16PI combination of power-on reset, brown-out detection, watchdog timer, and EEPROM parameter storage, which together deliver the fault recovery and configuration retention these products require. The three timers generate phase-correct PWM for fan and blower control while the ADC reads NTC thermistors on multiple channels for multi-zone temperature monitoring. The 5V-only supply matches the transformer-derived rails common in appliance power supplies, and the industrial temperature grade covers attic, basement, and outdoor unit environments. The 512-byte EEPROM holds calibration and user settings through power cycles without external memory.
Recomendado
Legacy Equipment Repair and Maintenance
Because the ATMEGA8535-16PI populated countless 1990s-2000s industrial and medical boards, it remains a staple for repair services. Rochester Electronics' authorized continuation means new-original units are still purchasable, avoiding risky remarked parts. The device's pin compatibility with AT90S8535, ATmega16, ATmega32, and ATmega8515 lets a repair shop substitute whichever same-footprint part is available, reprogramming the S8535C fuse when replacing the older AT90S8535. The through-hole PDIP package permits desolder-and-replace repair with basic tools, and identical ISP programming restores firmware extracted from a donor unit or held in service archives.
Recomendado
Education and Prototyping
The ATMEGA8535-16PI is well suited to embedded-systems teaching labs and breadboard prototyping: the 0.6-inch 40-pin PDIP inserts directly into sockets and breadboards without adapters, the 5V supply tolerates student wiring errors better than 3.3V parts, and the full peripheral set - USART, TWI, SPI, three timers, PWM, and an 8-channel 10-bit ADC - supports an entire semester of progressively complex laboratories from blink to data acquisition. Programs load via a simple ISP programmer costing a few dollars, and free AVR-GCC toolchains run on any platform, keeping the complete learning setup within a typical education budget.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA8535-16PI — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATMEGA8535-16PU | ATMEGA16-16PI | ATMEGA32A-PI | ATMEGA8515-16PI | AT90S8535-16PI |
|---|---|---|---|---|---|---|
| Package | 40-PDIP (0.600 inch) | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Atmel (now Microchip) |
| Flash Memory | 8 KB | 8 KB | 16 KB | 32 KB | 8 KB | 8 KB |
| SRAM | 512 B | 512 B | 1 KB | 2 KB | 512 B | 512 B |
| Max Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.0 V to 6.0 V |
| ADC | 8-ch 10-bit | 8-ch 10-bit | 8-ch 10-bit | 8-ch 10-bit | None | 8-ch 10-bit |
Principais diferenciais
- Industrial temperature grade in through-hole package (vs ATMEGA8535-16PU)
- Integrated 8-channel 10-bit ADC (vs ATMEGA8515-16PI)
- AT90S8535 migration path with compatibility fuse (vs AT90S8535-16PI)
Notas de projeto
Estimated: when powering from a 7805-type regulator, budget VCC (up to 20 mA core at 16 MHz) plus per-pin I/O loads (20 mA each) against the regulator rating; keep VCC within 4.5V to 5.5V or the 16 MHz clocking guarantee is void. Decouple each VCC/AVCC pin with 100 nF ceramic caps placed within a few millimeters, plus one bulk 10 uF per board. Ensure RESET (pin 4) has a 10k pull-up; an uncontrolled reset line is the most common field-failure cause on AVR boards.
Separate analog and digital grounds: AGND (pin 26 area) should connect to digital GND at a single star point, and AVCC must be filtered (ferrite bead plus 100 nF) from VCC for the ADC to reach full 10-bit accuracy. Route ADC traces on Port A away from PWM and crystal lines. For the XTAL pair (pins 7-8), keep the crystal and its load capacitors within 10 mm of the pins with guard ground around them to prevent spurious clocking at 16 MHz.
When substituting an ATmega16/ATmega32 on an ATmega8535 board, remember the ATmega16/32 fuse map and register addresses differ from the ATmega8535 - a firmware rebuild, not just reflash, is required, and JTAG enable on PC2-PC5 (fused on by default on ATmega16/32) will steal TWI pins unless disabled. When replacing AT90S8535, set the S8535C compatibility fuse per datasheet 2502S. Also verify EEPROM wear: 100k erase/write endurance is per cell; do not log data every loop iteration.
All 32 I/O lines on the ATmega8535-16PI can source or sink substantial current, but switching many pins simultaneously at 5V causes ground bounce visible on the ADC. Limit simultaneous port-wide switching, or use series resistors (47-100 ohm) on long unshielded outputs driving cables. For USART lines exceeding roughly 30 cm at 115200 baud, add a series resistor and consider an RS-485 transceiver; the internal AVR protection diodes tolerate only small negative ringing on inputs.
Informações de conformidade
Compliance status not stated in the provided verified web data; the PI suffix denotes industrial temperature grade, not RoHS status. Consult Microchip product page or certificate of conformance for RoHS/REACH declarations.
