ATMEGA8535-16MI - 8-bit AVR MCU 16MHz 8KB Flash | Microchip
MPN： ATMEGA8535-16MI ✓ 啟用中ATMEGA8535-16MI 概覽
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, ADCs, and communication interfaces. Within the semiconductor hierarchy, the ATmega8535 belongs to the AVR ATmega family of 8-bit microcontrollers, positioned under the broader categories of embedded processors and integrated circuits. AVRs use a Harvard architecture with most single-cycle instructions.
Key features include an advanced RISC architecture with 130 powerful instructions, most executing in a single clock cycle; 32 x 8 general-purpose working registers; fully static operation up to 16 MHz; and self-programming Flash supporting boot-code operation. The 8-channel 10-bit ADC enables direct analog sensor interfacing, while three hardware timers/PWM channels support motor control and precision timing tasks.
Architecturally, the ATmega8535 combines the AVR enhanced RISC core with separate program and data buses, allowing one instruction fetch and execution per clock. Operating voltage is 4.5V to 5.5V, with an industrial temperature range of -40C to +85C for the MI (VQFN) grade.
Typical applications include industrial automation, consumer electronics, sensor acquisition systems, motor control, and embedded control nodes where an ADC-rich, 5V-tolerant MCU is required.
Design consideration: budget Flash and SRAM carefully - 8KB Flash and 512B SRAM suit compact C or assembly firmware but not large RTOS-based designs; consider ATmega64/128 for larger code.
This page synthesizes distributor pricing context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ATMEGA8535-16MI — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATMEGA8535-16MI （相同外形與佔位） — 差異在於 Package, Throughput, Serial Interfaces, Timers, RoHS Status.
ATMEGA8535L-8MI
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8515-16MI
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8535-16MI 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 8 KB In-System Programmable |
| SRAM | 512 B |
| EEPROM | 512 B |
| 最大時脈頻率 | 16 MHz |
| Throughput | 16 MIPS at 16 MHz |
| Instruction Set | 130 instructions, most single-cycle |
| Operating Voltage | 4.5 V to 5.5 V |
| ADC | 8-channel 10-bit |
| 工作溫度 | -40C to +85C |
| 封裝 | 44-VQFN (7x7 mm) |
| 安裝類型 | Surface Mount |
| Typical Applications | Industrial automation, consumer electronics |
| Fully Static Operation | Up to 16 MHz |
| General Purpose Registers | 32 x 8 |
| RoHS 狀態 | unknown |
ATMEGA8535-16MI 44-vqfn (7x7 mm) 腳位配置指南
ATMEGA8535-16MI（44-vqfn (7x7 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATMEGA8535-16MI.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA8535-16MI 適用於 6 應用s: Industrial Automation Control, Analog Sensor Acquisition Systems, Motor Control and PWM Drivers, Consumer Electronics Embedded Control, Battery-Powered and Low-Power Instruments, Legacy System Maintenance and Drop-In Repair.
Industrial Automation Control
The ATMEGA8535-16MI fits industrial automation nodes because it combines a -40C to +85C industrial temperature rating with a noise-tolerant 4.5-5.5V supply and a 44-VQFN (7x7) footprint suited to compact control PCBs. Its 8-channel 10-bit ADC can digitize up to eight analog process sensors directly, while hardware timers provide deterministic PWM for actuators. In a typical controller, the MCU runs a compact C control loop at 16 MHz (16 MIPS), reading sensors through the ADC and driving relays or drivers via port pins. Because the Flash is In-System Programmable, field firmware updates are possible without socketing the device, reducing maintenance cost on deployed automation equipment.
推薦
Analog Sensor Acquisition Systems
The ATMEGA8535-16MI's integrated 8-channel 10-bit ADC is the primary reason to select it for multi-sensor data acquisition. Eight inputs at 10-bit resolution allow temperature, pressure, and level sensors to connect directly to the MCU without an external ADC, cutting BOM cost and board area. Running at 16 MHz, the AVR performs oversampling and averaging in the 512B SRAM, and calibration constants can be stored in the 512B EEPROM. The In-System Programmable 8KB Flash allows acquisition firmware updates on the bench via SPI. Design consideration: use AVCC and AREF filtering and keep analog traces short on the VQFN-44 layout to preserve ADC accuracy at 10-bit levels.
推薦
Motor Control and PWM Drivers
The ATMEGA8535-16MI supports small motor control tasks through its hardware timer/PWM outputs and single-cycle RISC instruction set, which sustains 16 MIPS at 16 MHz for responsive closed-loop control. Firmware running in the 8KB Flash can implement PI speed loops using ADC feedback from current or tachometer signals on the 8-channel 10-bit converter, while hardware PWM drives H-bridge or driver-IC inputs. The 5V supply and industrial temperature rating suit workshop and factory environments. For high-current stages, pair the MCU with gate drivers or MOSFETs; keep the 44-VQFN die pad grounded to reduce thermal impedance and noise coupling into the ADC used for feedback.
推薦
Consumer Electronics Embedded Control
According to Microchip USA, typical applications for the ATMEGA8535-16MI include consumer electronics, where its combination of low cost, single-chip integration, and mature toolchain is valuable. The 8KB Flash and 512B SRAM are sufficient for appliance UI logic, keypad scanning, LED/LCD driving, and simple protocol handling, while the 8-channel 10-bit ADC reads potentiometers, thermistors, or battery voltage directly. The 44-VQFN (7x7 mm) surface-mount package supports automated assembly in volume production. The self-programming Flash enables feature updates after manufacture. For cost-sensitive consumer designs, the fully static core also allows clock scaling to reduce active power at reduced throughput requirements.
推薦
Battery-Powered and Low-Power Instruments
While the -16MI grade is optimized for 5V operation, the pin-compatible ATMEGA8535L-8MI variant (2.7-5.5V, 8 MHz) addresses battery-powered instrumentation on the same 44-VQFN layout. A single PCB design can therefore serve both mains-powered (5V, 16 MHz) and portable (3V, 8 MHz) instrument variants by swapping the MCU order, preserving layout and certification investment. The fully static core allows clock gating and sleep modes for power reduction between measurements, and the EEPROM stores calibration data across battery replacement. Use the 10-bit ADC with sleep-mode sampling to minimize average current; the 512B SRAM comfortably holds sample buffers for handheld measurement firmware.
推薦
Legacy System Maintenance and Drop-In Repair
A significant ongoing use of the ATMEGA8535-16MI is repairing and sustaining legacy AVR-based equipment originally designed around the Atmel mega8535. Because the part remains active with Microchip and shares its footprint with ATMEGA8535L-8MI and (for ADC-free boards) ATMEGA8515-16MI, service organizations can keep production lines and installed bases alive without PCB rework. The In-System Programmable Flash allows original firmware to be reflored via SPI without desoldering, and 5V, -40C to +85C ratings match original design environments. Verify the exact MLF-44 pinout against the manufacturer datasheet before substitution, as footprint-compatible family members differ in peripheral set.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA8535-16MI — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATMEGA8535L-8MI | ATMEGA8515-16MI |
|---|---|---|---|
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Memory | 8 KB ISP Flash | 8 KB ISP Flash | 8 KB ISP Flash |
| Maximum Clock / Throughput | 16 MHz / 16 MIPS | 8 MHz / 8 MIPS (-50%) | 16 MHz / 16 MIPS |
| Operating Voltage | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| 10-bit ADC | Yes, 8-channel | Yes, 8-channel | No ADC |
| SRAM | 512 B | 512 B | 512 B |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C |
主要差異化特點
- 16 MHz performance at 5V (對比ATMEGA8535L-8MI)
- Integrated 8-channel 10-bit ADC (對比ATMEGA8515-16MI)
- Compact 44-VQFN (7x7 mm) MLF package (對比ATMEGA8535-16AU)
設計說明
The ATMEGA8535-16MI is a 5V-only device: the 16-speed grade is specified for 4.5-5.5V operation, so do not attempt 3.3V designs on this order code - select ATMEGA8535L-8MI for 2.7-5.5V rails (max 8 MHz). Decouple VCC and AVCC independently with 100 nF ceramics placed within a few millimeters of the VQFN pads, and tie the exposed die pad of the MLF/VQFN package to the ground plane as required by Atmel's MLF application guidance.
On the 44-VQFN (7x7 mm) footprint, connect the exposed center pad to a solid ground pour with an array of thermal vias - the MLF die pad is the primary thermal and ground return path and is often tied to GND rather than left floating. Keep AVCC and AREF traces short and filter AREF with a capacitor to GND when using the 10-bit ADC; separate the analog port-A routing from switching PWM outputs on ports B and D to preserve ADC signal-to-noise.
Memory budgeting is the most common pitfall: 8KB Flash and 512B SRAM fill quickly with large C libraries - avoid printf-heavy code and consider the ATmega64 family if code size grows. Second, do not confuse package suffixes: -16MI (VQFN), -16AU (TQFP), and -16PI (PDIP) are electrically identical but not footprint-interchangeable. Third, clock source selection (external crystal vs internal RC) is set by fuses; incorrect CKOPT/fuse settings can cause startup failures on 16 MHz crystal designs.
合規資訊
Compliance status not stated in the provided web data; verify on the official Microchip ATmega8535 product page.