ATMEGA8535-16PU - 8-bit AVR MCU 16MHz 8KB Flash | Microchip
MPN: ATMEGA8535-16PU ✓ פעילATMEGA8535-16PU סקירה
A microcontroller unit (MCU) is a complete computing system on a single chip, combining a processor core, program memory, data memory, and peripherals. The ATmega8535 belongs to the AVR 8-bit MCU family (MCU -> 8-bit MCU -> AVR ATmega -> Microchip AVR), which uses an advanced RISC architecture with 130 powerful instructions, most of which execute in a single clock cycle, plus 32 general-purpose working registers directly connected to the ALU.
Key features include 8 KB self-programmable Flash with read-while-write support, 512 B EEPROM for non-volatile data storage, 512 B SRAM, and 32 general-purpose I/O lines. Peripheral integration is strong for its class: a serial programmable USART, SPI serial interface, three flexible Timer/Counters with compare and PWM modes, an 8-channel 10-bit ADC, programmable Watchdog Timer with on-chip oscillator, and an internal analog comparator.
Technically, the AVR Harvard architecture separates program and data buses, allowing simultaneous instruction fetch and execution. In-System Programming (ISP) via the SPI port and In-Application self-programming via the boot section eliminate dedicated programming cycles in production and allow firmware field updates. The ATmega8535 is also pin compatible with AT90S8535 and ATmega8515, easing migration on existing PCBs.
Typical applications include industrial automation and control, embedded systems, consumer electronics, motor control using PWM timer outputs, and sensor acquisition systems leveraging the 10-bit ADC.
A key design consideration: the 16 MHz rating applies only at 4.5 V to 5.5 V; at lower voltages the maximum safe frequency drops, so match supply rails and fuses carefully.
This page synthesizes distributor pricing, drop-in alternatives, practical design notes, and pinout data not consolidated in the manufacturer datasheet.
חלופות תחליף ישיר עבור ATMEGA8535-16PU — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ATMEGA8535-16PU (אותו גורם צורה וטביעת רגל) — שונים ב Package, Operating Temperature, Communication Interfaces, Instructions, EEPROM.
ATMEGA8535-16PI
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA8515-16PU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA16A-PU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA32A-PU
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA8535-16AJ
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ATMEGA8535-16PU דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | AVR 8-bit RISC |
| Max Clock Frequency | 16 MHz |
| Throughput | 16 MIPS at 16 MHz |
| Flash Program Memory | 8 KB (4K x 16) |
| SRAM | 512 B |
| EEPROM | 512 B |
| מתח אספקה | 4.5 V to 5.5 V |
| I/O Lines | 32 |
| ADC | 8-channel, 10-bit |
| Timers/Counters | 3 (two 8-bit, one 16-bit) |
| Communication Interfaces | USART, SPI |
| Analog Comparator | Yes, on-chip |
| Watchdog Timer | Programmable, with on-chip oscillator |
| Programming | In-System Programmable (ISP), self-programmable boot |
| Instructions | 130 powerful instructions, most single-cycle |
| מארז | 40-PDIP (0.600 inch, 15.24 mm) |
| סוג הרכבה | Through-Hole |
| טמפרטורת פעולה | 0C to +70C (P suffix, commercial) |
| סטטוס RoHS | Compliant |
תצורת פינים של ATMEGA8535-16PU
| פין 1 | PB0/XCK/T0 — Port B bit 0 / USART external clock / Timer0 counter input |
| פין 2 | PB1/T1 — Port B bit 1 / Timer1 counter input |
| פין 3 | PB2/INT2/AIN0 — Port B bit 2 / External interrupt 2 / Analog comparator positive input |
| פין 4 | PB3/OC0/AIN1 — Port B bit 3 / Timer0 output compare / Analog comparator negative input |
| פין 5 | PB4/SS — Port B bit 4 / SPI slave select |
| פין 6 | PB5/MOSI — Port B bit 5 / SPI master output, slave input |
| פין 7 | PB6/MISO — Port B bit 6 / SPI master input, slave output |
| פין 8 | PB7/SCK/UCSK — Port B bit 7 / SPI serial clock |
| פין 9 | RESET — Reset input, active low |
| פין 10 | VCC — Digital supply voltage (4.5 V to 5.5 V) |
| פין 11 | GND — Ground |
| פין 12 | XTAL1 — Inverting oscillator amplifier input / internal clock input |
| פין 13 | XTAL2 — Inverting oscillator amplifier output |
| פין 14 | PD0/RXD — Port D bit 0 / USART receive input |
| פין 15 | PD1/TXD — Port D bit 1 / USART transmit output |
| פין 16 | PD2/INT0 — Port D bit 2 / External interrupt 0 |
| פין 17 | PD3/INT1 — Port D bit 3 / External interrupt 1 |
| פין 18 | PD4/OC1B — Port D bit 4 / Timer1 output compare B (PWM) |
| פין 19 | PD5/OC1A — Port D bit 5 / Timer1 output compare A (PWM) |
| פין 20 | PD6/ICP1 — Port D bit 6 / Timer1 input capture |
| פין 21 | PD7/OC2 — Port D bit 7 / Timer2 output compare (PWM) |
| פין 22 | PC0/SCL — Port C bit 0 / Two-wire serial clock |
| פין 23 | PC1/SDA — Port C bit 1 / Two-wire serial data |
| פין 24 | PC2/TCK — Port C bit 2 / JTAG test clock |
| פין 25 | PC3/TMS — Port C bit 3 / JTAG test mode select |
| פין 26 | PC4/TDO — Port C bit 4 / JTAG test data output |
| פין 27 | PC5/TDI — Port C bit 5 / JTAG test data input |
| פין 28 | PC6/TOSC1 — Port C bit 6 / Timer2 oscillator input (32.768 kHz RTC) |
| פין 29 | PC7/TOSC2 — Port C bit 7 / Timer2 oscillator output |
| פין 30 | AVCC — ADC supply voltage; connect to VCC via low-pass filter |
| פין 31 | GND — Ground |
| פין 32 | AREF — ADC analog reference voltage |
| פין 33 | PA7/ADC7 — Port A bit 7 / ADC channel 7 |
| פין 34 | PA6/ADC6 — Port A bit 6 / ADC channel 6 |
| פין 35 | PA5/ADC5 — Port A bit 5 / ADC channel 5 |
| פין 36 | PA4/ADC4 — Port A bit 4 / ADC channel 4 |
| פין 37 | PA3/ADC3 — Port A bit 3 / ADC channel 3 |
| פין 38 | PA2/ADC2 — Port A bit 2 / ADC channel 2 |
| פין 39 | PA1/ADC1 — Port A bit 1 / ADC channel 1 |
| פין 40 | PA0/ADC0 — Port A bit 0 / ADC channel 0 |
יישומים טיפוסיים
ATMEGA8535-16PU מתאים עבור 6 יישוםs: Industrial Automation and Control, Sensor Acquisition and Data Logging, Legacy AT90S8535 PCB Migration, Educational and Hobbyist Embedded Systems, Motor Control and PWM Systems, Consumer Electronics Embedded Control.
Industrial Automation and Control
The ATMEGA8535-16PU fits industrial control nodes that combine digital sequencing with analog monitoring: its 16 MHz AVR core delivers 16 MIPS for deterministic control loops, 32 GPIO lines drive relays, contactors, and indicator banks directly, and the 8-channel 10-bit ADC samples 0-5 V process signals such as pressure, level, and temperature from external transducers. The three timers with compare outputs generate PWM for heater or pump control, while the USART links to SCADA gateways. The 512 B EEPROM stores calibration constants and setpoints across power cycles. Because the 5 V rail matches legacy industrial I/O standards, level shifting is eliminated, and the watchdog timer guarantees recovery from transient faults in unattended equipment.
מומלץ
Sensor Acquisition and Data Logging
For multi-channel sensor acquisition, the ATmega8535's 8-channel 10-bit ADC with AVCC and AREF reference pins (pins 30 and 32 on PORTA, ADC0-ADC7) digitizes up to eight analog sensors with a resolution of approximately 4.9 mV per LSB on a 5 V reference. The USART streams readings to a host PC or GSM module, and the SPI port interfaces external EEPROM or SD-card media for local logging beyond the on-chip 512 B EEPROM. Timer-driven ADC triggering produces jitter-free sampling intervals. The part suits environmental monitoring, battery-stack probes, and portable instrumentation where the PDIP package allows quick socketed prototyping and field module replacement without reflow equipment.
מומלץ
Legacy AT90S8535 PCB Migration
The ATmega8535 was designed explicitly as the successor to the AT90S8535: Microchip documents that it is pin compatible and can replace AT90S8535 on existing printed circuit boards, enabling drop-in repair of discontinued-stock systems. The S8535C fuse programs compatibility behavior, though fuse-bit locations and electrical characteristics differ and must be re-verified per the datasheet. Engineers maintaining servo controllers, test fixtures, or consumer products built around AT90S8535 can use ATMEGA8535-16PU in the same 40-PDIP socket, reflash the application with minor timing adjustments, and restore full functionality while gaining ISP programming and self-programming boot capability absent from the original part.
מומלץ
Educational and Hobbyist Embedded Systems
The 40-PDIP through-hole package makes ATMEGA8535-16PU ideal for education: it solders to single- or double-sided prototype boards, inserts into ZIF sockets for repeated reuse, and tolerates hand rework by beginners. The AVR architecture - 130 mostly single-cycle instructions and 32 working registers - is widely taught in university microcontroller courses, and the open-source AVR-GCC toolchain plus the MightyCore Arduino hardware package support ATmega8535 directly, enabling Arduino-IDE development. The 8-channel ADC, PWM timers, USART, and SPI expose all classic embedded concepts (analog input, motor control, serial communication) on one 5 V-tolerant chip, and its roughly $3 unit price keeps course kit budgets low.
מומלץ
Motor Control and PWM Systems
The ATmega8535 provides four PWM-capable compare outputs: OC0 on pin PB3, OC1A on PD5, OC1B on PD4, and OC2 on PD7, driven by three timers with phase-correct and fast PWM modes. This enables dual-motor H-bridge control with independent speed channels at up to 16 MHz timer resolution for fine duty-cycle control. The external interrupt pins INT0/INT1/INT2 (PD2, PD3, PB2) capture quadrature encoder feedback, while the analog comparator supports zero-cross detection for brushless commutation. The 10-bit ADC samples motor current shunts for overload protection. Designs should route MOSFET gate drivers close to the PWM pins and validate the 5 V logic thresholds against the chosen driver ICs.
מומלץ
Consumer Electronics Embedded Control
Cost-sensitive consumer products such as small appliances, toys, remote controls, and lighting controllers benefit from the ATmega8535's integration: one chip replaces discrete logic, timers, and an external ADC, reducing BOM count and assembly cost. The internal RC oscillator option eliminates the external crystal in timing-tolerant products, and the power-down sleep mode with watchdog wake-up keeps standby current low for battery-powered devices. The 5 V operation aligns with USB and legacy wall-adapter supplies. The PDIP package suits low-volume or hand-assembled production runs, while the TQFP ATMEGA8535-16AU variant scales the same firmware to automated SMT assembly when volumes grow.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ATMEGA8535-16PU — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ATMEGA8535-16PI | ATMEGA8515-16PU | ATMEGA16A-PU | ATMEGA32A-PU |
|---|---|---|---|---|---|
| Package | 40-PDIP (0.600 inch) | 40-PDIP (0.600 inch) - same | 40-PDIP (0.600 inch) - same | 40-PDIP (0.600 inch) - same | 40-PDIP (0.600 inch) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 8 KB | 16 KB | 32 KB |
| SRAM | 512 B | 512 B | 512 B | 1 KB | 2 KB |
| ADC | 8-channel, 10-bit | 8-channel, 10-bit | None | 8-channel, 10-bit | 8-channel, 10-bit |
| Max Clock Frequency | 16 MHz (at 4.5-5.5 V) | 16 MHz (at 4.5-5.5 V) | 16 MHz (at 4.5-5.5 V) | 16 MHz (at 4.5-5.5 V) | 16 MHz (at 4.5-5.5 V) |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C | -40C to +85C |
| GPIO Lines | 32 | 32 | 32 | 32 | 32 |
מבדילים עיקריים
- Integrated 8-channel 10-bit ADC (לעומתATMEGA8515-16PU)
- Identical die and pinout in industrial temperature grade (לעומתATMEGA8535-16PI)
- Lower Flash may increase firmware pressure (לעומתATMEGA16A-PU)
הערות תכנון
Supply the ADC separately through AVCC (pin 30): connect AVCC to VCC through a low-pass filter such as a 10 uH inductor or 100-ohm resistor with 100 nF to GND, and decouple AREF (pin 32) with a 100 nF capacitor when using the internal reference. Noisy digital ground currents flowing into the analog section are the most common cause of ADC noise floor degradation on this device. Per the Microchip ATmega8535 datasheet, ADC accuracy is only guaranteed when AVCC stays within 0.3 V of VCC.
Fuse settings, not code, cause most ATmega8535 bring-up failures. The clock source fuses (CKSEL bits) must match your hardware: an external 16 MHz crystal requires CKSEL programmed for the correct crystal range plus appropriate SUT start-up fuses. Programmers that flash code but leave CKSEL defaults will run the part on the wrong oscillator and appear dead. Additionally, when migrating from AT90S8535, remember fuse-bit locations differ between the two devices even though the PCB footprint is identical.
For the PDIP package, place a 100 nF ceramic decoupling capacitor within a few millimeters of pin 10 (VCC) to pin 11 (GND), and add a 10 uF bulk capacitor per board section. Keep the SPI programming header (MOSI, MISO, SCK, RESET on PB5-PB7 and pin 9) short and routed away from PWM traces on PD4/PD5/PD7, since in-circuit programming occurs while those outputs toggle. The 2.54 mm PDIP lead pitch makes hand prototyping straightforward, but insert a socket rather than soldering the MCU directly for firmware iterations.
מידע על תאימות
RoHS compliance per distributor listings (DigiKey/Mouser). REACH, lead-free, halogen-free, and conflict-minerals status not explicitly stated in provided web data.
