ATMEGA8L-8PC - 8MHz AVR 8KB Flash MCU | Microchip
MPN: ATMEGA8L-8PC ✗ Cuối đờiATMEGA8L-8PC Tóm tắt
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as ADCs, timers, and serial interfaces onto one die. MCUs sit at the heart of the embedded systems hierarchy - embedded processor, microcontroller, system-on-chip - and the AVR ATmega family from Atmel (now Microchip Technology) is one of the most widely deployed 8-bit MCU architectures, famous as the heart of classic Arduino boards.
Key features of the ATMEGA8L-8PC include the advanced AVR RISC architecture with 130 powerful instructions, most executing in a single clock cycle, 32 general-purpose working registers, and two 8-bit and one 16-bit timers/counters. Peripherals include a 6-channel 10-bit ADC, USI-class serial connectivity via SPI, TWI (I2C-compatible), and UART, plus an on-chip analog comparator.
The L designation specifies low-voltage operation from 2.7V to 5.5V, making the device suitable for battery-powered designs. The -8 speed grade is rated to 8 MHz, and the P identifies the plastic 28-lead PDIP package while C denotes commercial temperature operation. In-system programmable Flash allows firmware updates without removing the device from the board.
Technical depth: fully static operation, optional Brown-out Detection, internal calibrated RC oscillator (1/2/4/8 MHz), and external or internal clock sources provide flexible timing. Power management includes idle, ADC noise reduction, and power-down sleep modes for microamp-class standby current.
Typical applications include hobbyist and educational embedded systems, low-cost industrial control, sensor acquisition boards using the 10-bit ADC, and legacy maintenance of AVR-based products.
Design consideration: when replacing an ATMEGA8L-8PC with the newer ATMEGA8A, verify fuse settings and the internal RC oscillator calibration bytes. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA8L-8PC — 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 ATMEGA8L-8PC (cùng hình factor và footprint) — khác nhau ở Package, ADC Channels, Flash Memory, Instructions, Operating Temperature.
ATMEGA8L-8PU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA8A-PU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA8A-PI
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA8L-8PI
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA8-16PI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA8L-8PC Tỷ lệ tối đa & tính chất điện
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Flash Memory | 8 KB (4K x 16) |
| SRAM | 1 KB |
| EEPROM | 512 Bytes |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Connectivity | I2C, SPI, UART/USART |
| ADC Channels | 6 or 8 channel 10-bit |
| Number of I/O | 23 |
| Timers/Counters | 2 x 8-bit, 1 x 16-bit |
| Throughput | Up to 8 MIPS at 8 MHz |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Hộp | 28-PDIP (0.300in, 7.62mm) |
| Kiểu lắp đặt | Through Hole |
| Programmability | In-System Programmable (ISP) Flash |
| Oscillator | Internal calibrated RC (1/2/4/8 MHz) or external crystal |
| Series | AVR ATmega |
Cấu hình chân ATMEGA8L-8PC
| Chân 1 | PC6 (RESET) — Reset input / Port C bit 6 |
| Chân 2 | PD0 (RXD) — UART receive input / Port D bit 0 |
| Chân 3 | PD1 (TXD) — UART transmit output / Port D bit 1 |
| Chân 4 | PD2 (INT0) — External interrupt 0 / Port D bit 2 |
| Chân 5 | PD3 (INT1) — External interrupt 1 / Port D bit 3 |
| Chân 6 | PD4 (T0) — Timer/Counter0 external clock input / Port D bit 4 |
| Chân 7 | VCC — Digital supply voltage (2.7V to 5.5V) |
| Chân 8 | GND — Ground |
| Chân 9 | PB6 (XTAL1/TOSC1) — Oscillator inverter input / Timer oscillator input / Port B bit 6 |
| Chân 10 | PB7 (XTAL2/TOSC2) — Oscillator inverter output / Timer oscillator output / Port B bit 7 |
| Chân 11 | PD5 (T1) — Timer/Counter1 external clock input / Port D bit 5 |
| Chân 12 | PD6 (AIN0) — Analog comparator positive input / Port D bit 6 |
| Chân 13 | PD7 (AIN1) — Analog comparator negative input / Port D bit 7 |
| Chân 14 | PB0 (ICP1) — Timer/Counter1 input capture / Port B bit 0 |
| Chân 15 | PB1 (OC1A) — Timer/Counter1 output compare A / PWM output / Port B bit 1 |
| Chân 16 | PB2 (SS/OC1B) — SPI slave select / Timer1 output compare B / Port B bit 2 |
| Chân 17 | PB3 (MOSI/OC2) — SPI master output / Timer2 PWM output / Port B bit 3 |
| Chân 18 | PB4 (MISO) — SPI master input / Port B bit 4 |
| Chân 19 | PB5 (SCK) — SPI serial clock / Port B bit 5 |
| Chân 20 | AVCC — ADC supply voltage; connect to VCC via low-pass filter |
| Chân 21 | AREF — ADC analog reference; decouple with 100 nF |
| Chân 22 | GND — Ground |
| Chân 23 | PC0 (ADC0) — ADC input channel 0 / Port C bit 0 |
| Chân 24 | PC1 (ADC1) — ADC input channel 1 / Port C bit 1 |
| Chân 25 | PC2 (ADC2) — ADC input channel 2 / Port C bit 2 |
| Chân 26 | PC3 (ADC3) — ADC input channel 3 / Port C bit 3 |
| Chân 27 | PC4 (ADC4/SDA) — ADC channel 4 / TWI data / Port C bit 4 |
| Chân 28 | PC5 (ADC5/SCL) — ADC channel 5 / TWI clock / Port C bit 5 |
Ứng dụng tiêu biểu
ATMEGA8L-8PC phù hợp cho 6 Áp dụngs: Educational and Hobbyist Embedded Systems, Battery-Powered Sensor Nodes, Legacy Industrial Control Board Maintenance, Analog Data Acquisition Front-Ends, Serial Protocol Converters and Gateways, Motor and Actuator Control.
Educational and Hobbyist Embedded Systems
The ATMEGA8L-8PC is a cornerstone of maker and university embedded-systems education because its 28-PDIP through-hole package can be plugged into a breadboard without any PCB, and the AVR architecture is famously documented and tool-supported by free compilers such as avr-gcc and Microchip Studio. Its 8 KB ISP Flash is large enough for substantial student projects - motor control, serial displays, and simple RTOS experiments - while the single-cycle execution of 130 instructions keeps timing deterministic and easy to teach. The internal calibrated 8 MHz RC oscillator means projects run with no external crystal, reducing bill-of-materials cost and layout errors for beginners. The 10-bit ADC supports analog sensor labs directly. For education, the ATMEGA8A-PU (same footprint, still in production) is the recommended part for new lab inventories.
Được đề xuất
Battery-Powered Sensor Nodes
The L-variant supply range of 2.7V to 5.5V lets the ATMEGA8L-8PC run directly from two AA cells or a single lithium cell without a regulator, and its AVR power-management modes drop standby current to microamp levels. A typical node reads one or more sensors through the 6-channel 10-bit ADC, processes thresholds in the 1 KB SRAM, and reports over UART or TWI to a radio module. In power-down sleep with the watchdog disabled, consumption is on the order of 1 uA class, enabling multi-month operation on alkaline cells. The internal RC oscillator removes crystal quiescent overhead in coarse-timing designs; a 32.768 kHz crystal on TOSC1/TOSC2 provides accurate timekeeping when needed. Designers should gate sensor power with an I/O pin to avoid sensor leakage dominating the budget.
Được đề xuất
Legacy Industrial Control Board Maintenance
A large installed base of 2000s-era industrial boards - relay controllers, pump sequencers, HVAC control modules - used the ATmega8 in 28-PDIP because through-hole assembly allowed easy field service. The ATMEGA8L-8PC remains a preferred service part for these boards: its commercial temperature rating matches indoor controller cabinets, and its 5V-tolerant I/O drives opto-isolators and relay drivers directly. Because firmware stored in the self-programming Flash can be updated in-system via the SPI header, technicians can patch logic without desoldering. For sustained maintainability, replacement stock should migrate to the ATMEGA8A-PU, which is pin-to-pin compatible and actively manufactured; fuse and lock-bit settings should be recorded from the original device before replacement so the new part can be programmed identically.
Được đề xuất
Analog Data Acquisition Front-Ends
The integrated 6-channel (8-channel in TQFP) 10-bit ADC with an internal bandgap reference option makes the ATMEGA8L-8PC a compact acquisition front-end for temperature, voltage, and potentiometer inputs. Channels can be scanned under software control, with the ADC noise-reduction sleep mode suppressing digital noise during conversion for one extra effective bit of resolution. AVCC on pin 20 and AREF on pin 21 must be properly decoupled - 100 nF at AREF is the datasheet recommendation - to achieve datasheet-level integral linearity. For 5V systems the ADC full-scale equals the supply, simplifying ratiometric bridge sensors such as strain gauges and NTC thermistors. Results stream over SPI at up to fosc/2, enough for kilohertz-rate sampling of slow industrial processes.
Được đề xuất
Serial Protocol Converters and Gateways
With hardware UART, SPI, and TWI (I2C) available simultaneously, the ATMEGA8L-8PC is well suited to small protocol bridges - RS-232 to I2C adapters, SPI sensor concentrators, and UART multiplexers - in legacy equipment. The UART runs from the internal oscillator for asynchronous traffic at moderate baud rates, though a crystal is recommended above 38.4 kbaud for guaranteed baud-rate accuracy across temperature. The 16-bit Timer1 with input capture can timestamp incoming pulses, while the hardware TWI master handles EEPROM and RTC peripherals without bit-banging overhead. At 8 MHz the device delivers 8 MIPS, sufficient to run double-buffered conversion between a 115.2 kbaud serial link and an I2C bus at 100 kHz. The 28-PDIP socket format matches the field-repairable construction of the equipment it serves.
Được đề xuất
Motor and Actuator Control
The ATMEGA8L-8PC provides three PWM outputs - OC1A and OC1B on the 16-bit Timer1 plus OC2 on the 8-bit Timer2 - allowing it to drive DC motor H-bridges, servos, and LED dimmers from a single 28-pin device. At 8 MHz, the 16-bit Timer1 delivers PWM resolutions up to 16 bits at low frequency or 8-bit resolution near 31 kHz, above audibility for fan and pump control. The analog comparator (AIN0/AIN1 on Port D) supports zero-cross detection for triac phase control and back-EMF sensing in brushless drivers. The ADC can close the loop on current or speed feedback. Input pins tolerate 5V logic directly, simplifying interface with classic driver ICs. For long-life designs, the ATMEGA8A-PU retains the same peripheral set and footprint with doubled clock headroom.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA8L-8PC — 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 | ATMEGA8L-8PU | ATMEGA8A-PU | ATMEGA8A-PI | ATMEGA8-16PI |
|---|---|---|---|---|---|
| Package | 28-PDIP (0.300in) | 28-PDIP (0.300in) - same | 28-PDIP (0.300in) - same | 28-PDIP (0.300in) - same | 28-PDIP (0.300in) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 8 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| Flash / SRAM / EEPROM | 8 KB / 1 KB / 512 B | 8 KB / 1 KB / 512 B | 8 KB / 1 KB / 512 B | 8 KB / 1 KB / 512 B | 8 KB / 1 KB / 512 B |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Lifecycle Status | Obsolete / legacy | Legacy stock | Active | Active | Legacy stock |
| Pinout Compatibility | Reference (28-PDIP ATmega8) | Pin-to-pin identical | Pin-to-pin identical | Pin-to-pin identical | Pin-to-pin identical |
Bảo phân biệt quan trọng
- 2.7V low-voltage operation across full speed range (vsATMEGA8-16PI)
- Commercial temperature cost advantage (vsATMEGA8L-8PU)
- Legacy ATmega8 register map preserved (vsATMEGA88V-10PU)
Ghi chú thiết kế
Decouple VCC (pin 7) and AVCC (pin 20) separately: 100 nF ceramic at each pin, plus 4.7-10 uF bulk near the socket. AVCC must be connected to VCC even if the ADC is unused, or the ADC port reads garbage; connect it through a 10 uH inductor or low-pass RC when ADC noise matters. Estimated: at 5V and 8 MHz, active current is roughly 3.6-5 mA per the datasheet typical curves, so a 100 mA regulator easily supplies the MCU plus a few LED/logic loads.
Decouple AREF (pin 21) with 100 nF to GND and never drive it with a low-impedance source while the internal reference is selected - doing so shorts the internal bandgap through the external source. Keep the ADC ground return separate from high-current switching ground and join them at a single point at the GND pin (pin 8 or 22). For breadboard use of the PDIP, add a 100 nF capacitor directly across pins 7 and 8 to compensate for the breadboard's parasitic inductance.
Fuse-bit misconfiguration is the most common field failure: setting SPIEN to disabled or selecting an external-clock fuse option with no clock source present bricks the device and requires a parallel/High-Voltage programmer to recover. Before replacing an ATmega8L with an ATmega8A, read the original device's fuse and lock bytes and program the replacement identically; the ATmega8A also uses revised oscillator calibration bytes. Keep RESET (pin 1) pulled up with 10 kOhm and add a 100 nF to GND for robust ISP programming.
Thông tin tuân thủ
The PC suffix historically denotes a tin-lead (non-RoHS) PDIP commercial part; the lead-free counterpart carries the P/pbf-free suffix. Compliance status not stated in provided web data - verify with Microchip product page before export-controlled or RoHS-regulated production use.
