ATMEGA8535L-8PI - 8-bit AVR MCU 8KB Flash 8MHz | Microchip
MPN: ATMEGA8535L-8PI ✓ Hoạt độngATMEGA8535L-8PI Tóm tắt
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in which program memory and data memory are accessed on separate buses, allowing most of its 130 powerful instructions to execute in a single clock cycle. Within the power-management hierarchy, a microcontroller unit (MCU) integrates CPU, memory, timers, and communication peripherals on one die, making it the central control element of an embedded system.
Key features include the AVR advanced RISC core with 32 general-purpose working registers delivering up to 16 MIPS throughput at 16 MHz (8 MIPS at the 8 MHz speed grade of the L variant), In-System Programmable (ISP) Flash with Read-While-Write capability, and a wide 2.7V to 5.5V operating voltage range unique to the ATmega8535L low-voltage grade. Peripheral integration covers three flexible Timer/Counters with compare modes, a byte-oriented Two-wire Serial Interface (I2C/TWI), a programmable serial USART, and an SPI interface for 544-byte SRAM expansion. Six software-selectable power-saving sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) enable battery-operated designs.
The 8-channel 10-bit successive-approximation ADC supports single-ended and differential conversions, useful for direct analog sensor acquisition. The JTAG-less, low-cost design targets classic through-hole prototyping on 0.600 in DIP sockets.
Typical applications include industrial control and automation, motor and HVAC control boards, sensor data acquisition nodes, and educational/hobby embedded platforms where DIP packages simplify prototyping and in-circuit programming.
Design consideration: the ATmega8535L speed grade limits operation to 0-8 MHz and 2.7-5.5V; for 16 MHz 4.5-5.5V operation choose the ATMEGA8535-16P grade instead, keeping the identical footprint.
This page synthesizes verified distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA8535L-8PI — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA8535L-8PI (cùng hình factor và footprint) — khác nhau ở Communication Interfaces, Operating Temperature, Package, SRAM, Throughput.
ATMEGA8535-16PJ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA8535L-8PU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AT90S8535-8PI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA16-16PU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA8515-16PI
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA32A-PU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA8535L-8PI Tỷ lệ tối đa & tính chất điện
| Core Processor | AVR |
| Core Size | 8-bit |
| Speed | 8 MHz |
| Flash Program Memory | 8 KB (4K x 16) |
| EEPROM | 512 bytes |
| RAM | 512 bytes |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Number of I/O | 32 |
| ADC Resolution | 10-bit |
| ADC Channels | 8 |
| Communication Interfaces | I2C, SPI, UART/USART |
| Timers/Counters | 3 |
| Instructions | 130 powerful instructions, most single-cycle |
| Sleep Modes | 6 (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) |
| Throughput | up to 16 MIPS at 16 MHz (8 MIPS at 8 MHz) |
| Hộp | 40-PDIP (0.600 in, 15.24 mm) |
| Kiểu lắp đặt | Through Hole |
| Flash Programming | In-System Programmable with Read-While-Write |
| Extended SRAM Interface | SPI interface to 544-byte SRAM |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
Cấu hình chân ATMEGA8535L-8PI
| Chân 1 | PB0 (XCK/T0) — PORTB bit 0 / USART external clock / Timer0 external clock |
| Chân 2 | PB1 (T1) — PORTB bit 1 / Timer1 external clock |
| Chân 3 | PB2 (AIN0/INT2) — PORTB bit 2 / analog comparator positive input / external interrupt 2 |
| Chân 4 | PB3 (AIN1/OC0) — PORTB bit 3 / analog comparator negative input / Timer0 output compare |
| Chân 5 | PB4 (SS) — PORTB bit 4 / SPI slave select |
| Chân 6 | PB5 (MOSI) — PORTB bit 5 / SPI master output, slave input |
| Chân 7 | PB6 (MISO) — PORTB bit 6 / SPI master input, slave output |
| Chân 8 | PB7 (SCK) — PORTB bit 7 / SPI serial clock |
| Chân 9 | RESET — Reset input, active low |
| Chân 10 | VCC — Digital supply voltage (2.7 V to 5.5 V) |
| Chân 11 | GND — Ground |
| Chân 12 | XTAL2 — Oscillator amplifier output |
| Chân 13 | XTAL1 — Oscillator amplifier input / external clock input |
| Chân 14 | PD0 (RXD) — PORTD bit 0 / USART receive data |
| Chân 15 | PD1 (TXD) — PORTD bit 1 / USART transmit data |
| Chân 16 | PD2 (INT0) — PORTD bit 2 / external interrupt 0 |
| Chân 17 | PD3 (INT1) — PORTD bit 3 / external interrupt 1 |
| Chân 18 | PD4 (OC1B) — PORTD bit 4 / Timer1 output compare B |
| Chân 19 | PD5 (OC1A) — PORTD bit 5 / Timer1 output compare A |
| Chân 20 | PD6 (ICP1) — PORTD bit 6 / Timer1 input capture |
| Chân 21 | PD7 (OC2) — PORTD bit 7 / Timer2 output compare |
| Chân 22 | PC0 (SCL) — PORTC bit 0 / TWI serial clock |
| Chân 23 | PC1 (SDA) — PORTC bit 1 / TWI serial data |
| Chân 24 | PC2 (TCK) — PORTC bit 2 / test clock |
| Chân 25 | PC3 (TMS) — PORTC bit 3 / test mode select |
| Chân 26 | PC4 (TDO) — PORTC bit 4 / test data output |
| Chân 27 | PC5 (TDI) — PORTC bit 5 / test data input |
| Chân 28 | PC6 (TOSC1) — PORTC bit 6 / timer oscillator input |
| Chân 29 | PC7 (TOSC2) — PORTC bit 7 / timer oscillator output |
| Chân 30 | AVCC — Analog supply voltage for ADC and PORTA |
| Chân 31 | GND — Ground |
| Chân 32 | AREF — ADC analog reference voltage |
| Chân 33 | PA7 (ADC7) — PORTA bit 7 / ADC channel 7 |
| Chân 34 | PA6 (ADC6) — PORTA bit 6 / ADC channel 6 |
| Chân 35 | PA5 (ADC5) — PORTA bit 5 / ADC channel 5 |
| Chân 36 | PA4 (ADC4) — PORTA bit 4 / ADC channel 4 |
| Chân 37 | PA3 (ADC3) — PORTA bit 3 / ADC channel 3 |
| Chân 38 | PA2 (ADC2) — PORTA bit 2 / ADC channel 2 |
| Chân 39 | PA1 (ADC1) — PORTA bit 1 / ADC channel 1 |
| Chân 40 | PA0 (ADC0) — PORTA bit 0 / ADC channel 0 |
Ứng dụng tiêu biểu
ATMEGA8535L-8PI phù hợp cho 6 Áp dụngs: Industrial Control and Automation, Sensor Data Acquisition, Embedded Education and Prototyping, Motor and HVAC Control, Serial Communication Gateways, Security and Access Control Panels.
Industrial Control and Automation
The ATMEGA8535L-8PI fits industrial control boards that need deterministic 8-bit control, multiple communication buses, and moderate analog acquisition in one through-hole device. Its three Timer/Counters with compare modes directly generate PWM for actuator and heater control, while the byte-oriented TWI (I2C) and SPI interfaces connect panel displays and EEPROM expansion. The industrial -40C to +85C temperature range suits factory-floor enclosures. Operating from 2.7V to 5.5V, it tolerates relaxed 3.3V or 5V logic rails. Designers typically clock it from an 8 MHz crystal via XTAL1/XTAL2, giving one MIPS per MHz; heavier signal-processing loads should be offloaded to hardware timers rather than software loops to stay within the 8 MHz budget.
Được đề xuất
Sensor Data Acquisition
The integrated 8-channel 10-bit successive-approximation ADC is the core reason the ATMEGA8535L-8PI suits multi-sensor acquisition nodes. Up to eight single-ended inputs on PORTA (PA0-PA7) sample temperature, pressure, and level signals at moderate rates, and differential modes cancel common-mode noise on bridge sensors such as strain gauges. The ADC Noise Reduction sleep mode silences the CPU clock during conversions, improving effective noise-free resolution. AVCC on pin 30 must be tied to a clean analog supply and AREF (pin 32) decoupled for rated accuracy. At 8 MHz the L grade provides ample sampling bandwidth for slow physical-process monitoring while consuming less dynamic power than 16 MHz grades.
Được đề xuất
Embedded Education and Prototyping
The 0.600 in 40-pin PDIP package is the defining advantage for education: the ATMEGA8535L-8PI plugs into standard DIP sockets and breadboard adapters, can be removed for external ISP programming, and tolerates repeated insertion cycles that damage fine-pitch SMD parts. Its 2.7V to 5.5V range lets students experiment with both 3.3V and 5V logic without level shifting, and 32 general-purpose I/O lines support LED matrices, keypads, LCDs, and UART terminal exercises in a single curriculum. The widely documented AVR architecture (130 mostly single-cycle instructions, 32 working registers) remains a staple of embedded-systems teaching, and ISP Flash enables reprogramming without removing the chip from the target board.
Được đề xuất
Motor and HVAC Control
For fan, pump, and HVAC damper control, the ATMEGA8535L-8PI combines PWM generation from its Timer/Counters with ADC feedback from current-sense or NTC inputs, closing the control loop in firmware with proportional-integral routines. The TWI bus reads digital temperature sensors on the same two wires used for configuration EEPROMs, reducing harness complexity in distributed HVAC units. Its wide 2.7V to 5.5V supply tolerates sagging unregulated rails during motor start transients. A practical consideration is PCB-level protection: flyback from inductive loads must be clamped away from the I/O pins, and the ADC sampling instant should be synchronized away from PWM switching edges to avoid rail noise corrupting readings.
Được đề xuất
Serial Communication Gateways
With hardware UART/USART, TWI (I2C), and SPI operating concurrently, the ATMEGA8535L-8PI serves as a protocol bridge in legacy equipment: for example, converting a modbus-style UART link from a host controller into TWI for slave peripherals, or buffering data into SPI serial memories for local logging. The SPI also expands external 544-byte SRAM when 512 bytes of internal RAM proves tight for message buffers. Running at 8 MIPS, it comfortably sustains 38.4 kbaud UART traffic with interrupt-driven ring buffers, though budgets should reserve headroom for CRC computation. Sleep modes allow the gateway to idle at microamp-level current between transactions in battery-backed installations.
Được đề xuất
Security and Access Control Panels
Access-control and small alarm panels benefit from the ATMEGA8535L-8PI balance of I/O count, EEPROM, and sleep modes. The 32 GPIO lines scan keypads, drive relays, and read door sensors; the 512-byte EEPROM stores calibration data, user codes, and tamper counters through power cycles without external NVRAM. Power-down and Standby sleep modes support mains-failure battery operation, waking via external interrupts on PORTD level changes. The 8 MHz clock keeps response latency to keypad presses well below perceptible thresholds. Because these panels often run for a decade, the mature, long-documented ATmega8535 family - with its extensive errata history and stable datasheet (Microchip document 2502) - provides predictable behavior for compliance-critical designs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA8535L-8PI — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATMEGA8535-16PJ | ATMEGA8535L-8PU | AT90S8535-8PI | ATMEGA16-16PU | ATMEGA32A-PU |
|---|---|---|---|---|---|---|
| Package | 40-PDIP (0.600 in) | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology (Atmel legacy) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 16 MHz | 8 MHz | 8 MHz | 16 MHz | 16 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 4.0 V to 6.0 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB | 32 KB |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 1 KB | 2 KB |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| Finish / RoHS | Lead-free (PI) | Lead-free | Tin-lead (legacy) | Legacy generation | Tin-lead (legacy) | Lead-free (RoHS) |
Bảo phân biệt quan trọng
- Widest supply range in the family (vsATMEGA8535-16PJ)
- RoHS lead-free finish (vsATMEGA8535L-8PU)
- Integrated ADC (vsATMEGA8515-16PI)
- Legacy register-map compatibility (vsATMEGA32A-PU)
Ghi chú thiết kế
Connect VCC (pin 10) and AVCC (pin 30) to a decoupled 2.7V-5.5V rail. Even when the ADC is unused, Microchip requires AVCC to be tied to VCC through a low-pass filter (e.g., 10 uH inductor or ferrite bead plus 0.1 uF capacitor) to guarantee specified device operation. Decouple each supply pin with 0.1 uF ceramic capacitors placed within a few millimeters of the pins, and add 4.7 uF to 10 uF of bulk capacitance near the socket.
Keep the analog reference (AREF, pin 32) clean: connect a 0.1 uF capacitor from AREF to ground and never drive it with a low-impedance source without a series resistor, or the internal reference can be damaged. Route ADC input traces on PORTA away from XTAL and PWM output traces (PD4/PD5/PD7). Ground pin 31 (GND) carries ADC return current - give it a solid, short connection to the analog ground plane rather than daisy-chaining to the digital ground.
The L speed grade is hard-limited to 0-8 MHz: overclocking the ATMEGA8535L-8PI to 16 MHz violates the datasheet speed/voltage derating and causes unreliable execution. Fuse configuration is also the most common field failure - setting SPIEN off or selecting an external clock source without a clock bricks the device; keep a parallel programmer or high-voltage parallel programmer available for fuse recovery. Finally, RESET (pin 9) needs a 10 kOhm pull-up for noise immunity on breadboarded designs.
Estimated: at 5.5V and 8 MHz with all 32 I/O pins sourcing 20 mA worst case (not a realistic load), dissipation remains under 0.5 W, and the 40-PDIP DIP-40 plastic package dissipates this comfortably in still air without a heatsink. In sleep-dominated designs (Power-down mode) average dissipation is in the milliwatt range. No thermal management is required for typical use; simply avoid continuous short-circuit currents on I/O pins, which are internally limited but thermally destructive if sustained.
Thông tin tuân thủ
The PI suffix denotes industrial temperature grade with current-production lead-free (RoHS) finish; the PU suffix variant uses legacy tin-lead plating. Verify RoHS/REACH certificates with the supplier at order time.
