ATMEGA8535L-8PU - 8KB Flash AVR MCU 8MHz DIP-40 | Microchip
MPN: ATMEGA8535L-8PU ✓ NakahandaATMEGA8535L-8PU Ulas
An AVR microcontroller is a single-chip computer built on the AVR enhanced RISC architecture, in which most of its 130 instructions execute in a single clock cycle, delivering roughly 1 MIPS per MHz. Within the embedded-systems hierarchy, a microcontroller unit (MCU) integrates the CPU core, program memory, data memory, peripherals, and general-purpose I/O on one die, replacing multi-chip processor-plus-logic solutions in industrial control, instrumentation, and hobbyist platforms.
Key features include 32 programmable I/O lines, an 8-channel 10-bit A/D converter for direct analog sensor connection, three flexible timer/counters (two 8-bit, one 16-bit) with compare and PWM modes, a byte-oriented Two-wire Serial Interface (TWI/I2C), and a full-duplex serial USART. The L suffix denotes the low-voltage grade, operating from 2.7V to 5.5V at 0-8 MHz per the internal verified database, suiting battery-powered designs.
Technically, the Harvard architecture with separate program and data buses plus a 2-cycle hardware multiplier underpins the high code efficiency. Six software-selectable sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) trade wake-up latency for microamp-level current. The 8 KB Flash supports 1,000 write/erase cycles with Read-While-Write, enabling field firmware updates via SPI ISP.
Typical applications include industrial control panels, ADC-based sensor data loggers, PWM motor control, and breadboard-friendly educational embedded systems where the through-hole DIP-40 package simplifies prototyping.
Design consideration: verify the VCC-versus-frequency curve before clocking near 8 MHz at low VCC, use a 0.1 uF decoupling capacitor across VCC/GND, and keep the AREF path clean for 10-bit ADC accuracy.
This page synthesizes distributor pricing, drop-in DIP-40 alternatives, full pinout, and design notes not consolidated in the manufacturer datasheet.
Mga alternatibo na pwedeng ilagay na ATMEGA8535L-8PU — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok ATMEGA8535L-8PU (parehas na form factor at footprint) — pagkakaiba sa Communication Interfaces, Operating Temperature, SRAM, EEPROM, Throughput.
ATMEGA8535L-8PI
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →ATMEGA8535-16PJ
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →AT90S8535-8PI
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
ATMEGA32L-8PU
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →ATMEGA8515-16PI
✅ Drop-In ⚠️ Mga Talaan Hindi NaiwerikmoMagkontak para sa presyo
Tingnan ang Datasheet →ATMEGA8535L-8PU Mga Pinakamataas na Rating at Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 8 KB (4K x 16) In-System Programmable |
| SRAM | 512 B |
| EEPROM | 512 B |
| Maksimum na Taktiko ng Oras | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V (L grade) |
| Throughput | Up to 8 MIPS at 8 MHz (1 MIPS/MHz) |
| ADC | 8-channel, 10-bit |
| Timers/Counters | 2 x 8-bit, 1 x 16-bit |
| Communication Interfaces | USART, TWI (I2C), SPI |
| General Purpose I/O | 32 lines |
| Flash Endurance | 1,000 write/erase cycles |
| Sleep Modes | 6 (Idle, ADC NR, Power-save, Power-down, Standby, Extended Standby) |
| Packhaging | 40-PDIP (0.600 in, 15.24 mm) |
| Uri ng Pagpapasok | Through Hole |
| Temperature na Operasyon | 0C to +70C (commercial, PU suffix) |
| Katayuan ng Lifecycle | Active |
Pin Configuration ng ATMEGA8535L-8PU
| Pin 1 | PB0 (XCK/T0) — PORTB bit 0 / USART external clock / Timer0 external clock input |
| Pin 2 | PB1 (T1) — PORTB bit 1 / Timer1 external clock input |
| Pin 3 | PB2 (INT2/AIN0) — PORTB bit 2 / External interrupt 2 / Analog comparator positive input |
| Pin 4 | PB3 (OC0/AIN1) — PORTB bit 3 / Timer0 output compare / Analog comparator negative input |
| Pin 5 | PB4 (SS) — PORTB bit 4 / SPI slave select |
| Pin 6 | PB5 (MOSI) — PORTB bit 5 / SPI master output slave input (used for ISP) |
| Pin 7 | PB6 (MISO) — PORTB bit 6 / SPI master input slave output (used for ISP) |
| Pin 8 | PB7 (SCK) — PORTB bit 7 / SPI serial clock (used for ISP) |
| Pin 9 | RESET — Reset input, active low |
| Pin 10 | VCC — Digital supply voltage (2.7 V to 5.5 V) |
| Pin 11 | GND — Digital ground |
| Pin 12 | XTAL2 — Inverting oscillator amplifier output |
| Pin 13 | XTAL1 — Inverting oscillator amplifier input / external clock input |
| Pin 14 | PD0 (RXD) — PORTD bit 0 / USART receive data input |
| Pin 15 | PD1 (TXD) — PORTD bit 1 / USART transmit data output |
| Pin 16 | PD2 (INT0) — PORTD bit 2 / External interrupt 0 |
| Pin 17 | PD3 (INT1) — PORTD bit 3 / External interrupt 1 |
| Pin 18 | PD4 (OC1B) — PORTD bit 4 / Timer/Counter1 output compare B PWM output |
| Pin 19 | PD5 (OC1A) — PORTD bit 5 / Timer/Counter1 output compare A PWM output |
| Pin 20 | PD6 (ICP1) — PORTD bit 6 / Timer/Counter1 input capture |
| Pin 21 | PD7 (OC2) — PORTD bit 7 / Timer/Counter2 output compare PWM output |
| Pin 22 | PC0 (SCL) — PORTC bit 0 / TWI serial clock line |
| Pin 23 | PC1 (SDA) — PORTC bit 1 / TWI serial data line |
| Pin 24 | PC2 (TCK) — PORTC bit 2 / JTAG test clock |
| Pin 25 | PC3 (TMS) — PORTC bit 3 / JTAG test mode select |
| Pin 26 | PC4 (TDO) — PORTC bit 4 / JTAG test data output |
| Pin 27 | PC5 (TDI) — PORTC bit 5 / JTAG test data input |
| Pin 28 | PC6 (TOSC1) — PORTC bit 6 / Timer oscillator input for async Timer2 |
| Pin 29 | PC7 (TOSC2) — PORTC bit 7 / Timer oscillator output for async Timer2 |
| Pin 30 | AVCC — Analog supply voltage for ADC and Port A |
| Pin 31 | GND — Ground |
| Pin 32 | AREF — Analog reference voltage for ADC |
| Pin 33 | PA7 (ADC7) — PORTA bit 7 / ADC channel 7 |
| Pin 34 | PA6 (ADC6) — PORTA bit 6 / ADC channel 6 |
| Pin 35 | PA5 (ADC5) — PORTA bit 5 / ADC channel 5 |
| Pin 36 | PA4 (ADC4) — PORTA bit 4 / ADC channel 4 |
| Pin 37 | PA3 (ADC3) — PORTA bit 3 / ADC channel 3 |
| Pin 38 | PA2 (ADC2) — PORTA bit 2 / ADC channel 2 |
| Pin 39 | PA1 (ADC1) — PORTA bit 1 / ADC channel 1 |
| Pin 40 | PA0 (ADC0) — PORTA bit 0 / ADC channel 0 |
Tipikal na mga Gamit
ATMEGA8535L-8PU ay nararapat para sa 6 aplikasyons: Industrial Control Panels, Sensor Data Logging, PWM Motor Control, Educational and Hobbyist Embedded Systems, Serial Communication Gateways, Battery-Powered Portable Instruments.
Industrial Control Panels
The ATMEGA8535L-8PU fits industrial control panels where 32 GPIO lines drive relays, indicators, and contactors while the 10-bit ADC monitors analog setpoints. Its 8 KB ISP Flash stores control logic, and the USART links to HMIs or SCADA gateways. Operating from a regulated 5V rail, the AVR core's 1 MIPS/MHz throughput executes closed-loop control at kilohertz rates, and the Watchdog Timer recovers firmware from disturbances. The through-hole DIP-40 package withstands vibration better than fine-pitch SMD in retrofit boards, and field firmware updates via SPI ISP avoid unsoldering the device during maintenance.
Inirekomenda
Sensor Data Logging
For battery-powered data loggers, the ATMEGA8535L-8PU's 8-channel 10-bit ADC digitizes temperature, pressure, and voltage inputs directly without an external converter, while 512 B EEPROM retains calibration constants across power cycles. The 2.7V minimum supply supports three-cell battery operation, and the Power-down sleep mode drops supply current to microamp levels between samples, extending battery life in multi-month deployments. The TWI interface connects external I2C EEPROM or RTC ICs to extend storage beyond the on-chip 512 B, and the USART streams logged data to a PC or radio module during periodic downloads.
Inirekomenda
PWM Motor Control
The ATMEGA8535L-8PU generates motor drive waveforms using its two 8-bit timers and one 16-bit timer with output-compare channels (OC0, OC1A, OC1B, OC2), producing hardware PWM without CPU intervention. The 16-bit Timer/Counter1 supports phase-correct and fast PWM modes for DC motor speed control, while the input-capture unit (ICP1) measures encoder or tachometer feedback with timer resolution. At 8 MHz, PWM resolution reaches 10 bits at reduced frequency, adequate for fan and pump control. Driving MOSFET gate-driver ICs from the timer outputs, the MCU closes speed loops at hundreds of hertz using the 10-bit ADC for current sensing.
Inirekomenda
Educational and Hobbyist Embedded Systems
The DIP-40 through-hole package of the ATMEGA8535L-8PU plugs directly into breadboards and 0.1-inch perfboards, making it a staple for electronics education and maker projects. Students program it over SPI ISP with free AVR-GCC toolchains and can observe signals on 32 GPIO pins with a logic probe. The 8-channel 10-bit ADC supports hands-on analog labs, and three timer/counters demonstrate PWM, input capture, and real-time concepts. Operation from a simple 5V USB supply, a 8 MHz crystal, and two decoupling capacitors is a complete minimum system, keeping entry cost minimal for classrooms.
Inirekomenda
Serial Communication Gateways
With a full-duplex USART, hardware SPI, and a byte-oriented Two-wire Serial Interface, the ATMEGA8535L-8PU bridges devices across different buses in small gateways. A typical design reads sensors over I2C, aggregates them in 512 B SRAM, and forwards frames over RS-485 or RS-232 via the USART at standard baud rates from its 8 MHz clock. The SPI master also drives external Flash or Ethernet modules where extra storage is needed. PORTC pins double as TWI (SCL/SDA on PC0/PC1), so the gateway fits entirely within one DIP-40 device while the 10-bit ADC simultaneously monitors the 5V rail or sensor excitation for diagnostics.
Inirekomenda
Battery-Powered Portable Instruments
Portable meters and handheld testers benefit from the ATMEGA8535L-8PU's combination of a 2.7V minimum supply, six sleep modes, and an integrated 10-bit ADC that eliminates a separate converter IC, reducing board area and quiescent budget. In ADC Noise Reduction mode the core halts while the converter runs, improving effective ADC resolution for millivolt-level measurements. The LCD-driving capability of port pins, the Power-save mode with Timer/Counter2 for periodic wake-up, and EEPROM storage of calibration data let a single DIP-40 device implement a complete handheld instrument that runs for months on alkaline cells between sampling sessions.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for ATMEGA8535L-8PU — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | ATMEGA8535L-8PI | ATMEGA8535-16PJ | AT90S8535-8PI | ATMEGA32L-8PU | ATMEGA8515-16PI |
|---|---|---|---|---|---|---|
| Package | 40-PDIP (0.600 in, 15.24 mm) | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel legacy) | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB ISP | 8 KB ISP | 8 KB ISP | 8 KB | 32 KB ISP | 8 KB ISP |
| SRAM | 512 B | 512 B | 512 B | 512 B | 2 KB | 512 B |
| Max Clock Frequency | 8 MHz | 8 MHz | 16 MHz | 8 MHz | 8 MHz | 16 MHz |
| Supply Voltage | 2.7 V to 5.5 V (L grade) | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.0 V to 6.0 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| 10-bit ADC | 8-channel | 8-channel | 8-channel | 8-channel | 8-channel | None |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) |
| Lifecycle Status | Active | Active | Active | Obsolete (ATmega8535 is its replacement) | Active | Active |
Pangunahing mga Pagkakaiba
- Low-voltage operation at 2.7 V (kumpara saATMEGA8535-16PJ)
- Integrated 8-channel 10-bit ADC (kumpara saATMEGA8515-16PI)
- Identical pinout across the whole family (kumpara saATMEGA32L-8PU)
- Active lifecycle support (kumpara saAT90S8535-8PI)
Talaan ng Disenyo
Connect AVCC (pin 30) to VCC through a low-pass filter (for example a 10 uH inductor or ferrite bead plus 0.1 uF capacitor) when using the ADC, because AVCC powers both Port A and the converter. The device functions with ADC disabled even if AVCC is not connected, but the datasheet recommends never leaving AVCC floating when Port A is used as digital I/O. Keep AREF (pin 32) clean: use an external reference with a 100 nF decoupling capacitor, or select the internal reference via software - never connect an external voltage source directly when the internal reference is enabled.
For through-hole prototyping, place a 0.1 uF ceramic capacitor directly across VCC (pin 10) and GND (pin 11), plus one bulk 10 uF capacitor per board section. For the crystal, place the 8 MHz crystal and its two load capacitors (typically 12-22 pF depending on crystal specification) within 20 mm of XTAL1/XTAL2 (pins 13-12) and keep those traces short to avoid startup failure and jitter. Ground pin 31 (GND) and pin 11 both to the same low-impedance ground plane, since the ADC ground return shares these pins.
Two pitfalls recur with this device. First, verify the VCC-versus-frequency curve: the L grade permits 0-8 MHz only when supply voltage supports it per the datasheet speed chart - do not assume 8 MHz operation at the absolute minimum 2.7 V without checking the datasheet graph. Second, when migrating from AT90S8535, remember fuse-bit locations and electrical characteristics differ per the Microchip datasheet; program the S8535C compatibility fuse if needed. Also note PC2-PC7 carry JTAG and Timer2 oscillator functions - disable JTAG via fuse if you need all eight PORTC pins as general I/O.
ISP programming uses PB5/PB6/PB7 (MOSI/MISO/SCK, pins 6-8) and RESET (pin 9). Keep a 10 kOhm pull-up on RESET and an isolation resistor on SCK if external circuitry loads the SPI bus, otherwise the programmer may fail to enter programming mode. Flash endurance is 1,000 write/erase cycles, so avoid firmware routines that self-write constants to program memory at runtime; use EEPROM (also 1,000 cycles) for parameter storage and rotate writes across pages to extend lifetime.
Impormasyon ng Pagsunod sa Kautusan
Compliance status not explicitly stated in the provided web data; the modern Microchip-produced ATMEGA8535L-8PU is generally RoHS compliant, but verify on the Microchip product page before specifying.
