ATMEGA8535-16MJ - 8-Bit AVR MCU 16MHz 8KB Flash | Microchip
MPN： ATMEGA8535-16MJ ✓ 啟用中ATMEGA8535-16MJ 概覽
An 8-bit AVR microcontroller is a member of the Harvard-architecture RISC family in which program memory and data memory occupy separate address spaces, allowing most instructions to execute in a single clock cycle. Within the system hierarchy, the ATmega8535 sits below the ATmega64/128 family as a mid-range microcontroller IC, integrating a CPU, non-volatile memory, SRAM, timers, serial interfaces, and an ADC on one chip, eliminating the need for discrete peripheral ICs in cost- and space-sensitive embedded designs.
Key features include a 130-instruction Advanced RISC architecture with most single-cycle execution and 32 general purpose working registers, delivering up to 16 MIPS throughput at 16 MHz. Three flexible Timer/Counters with compare modes support PWM generation and event timing. Communication is covered by a serial programmable USART, a byte-oriented Two-Wire Serial Interface (TWI/I2C), and a Serial Peripheral Interface (SPI), enabling multi-drop and high-speed links.
The 8-channel 10-bit A/D converter directly digitizes analog sensor inputs such as temperature, pressure, and voltage feedback without an external ADC. In-System Programmable Flash with Read-While-Write capability allows field firmware updates over UART or SPI. The 44-VQFN 7x7 mm package with exposed pad offers a compact, thermally efficient surface-mount footprint for dense industrial PCBs.
Typical applications include industrial control and automation, data acquisition systems, HVAC and building control, battery management, and low-cost instrumentation where an 8-channel ADC plus USART/TWI connectivity at 5V is required.
When designing with this device, remember that the -16 speed grade is specified for a 5V supply; plan decoupling on VCC/AVCC and route the ADC ground return carefully for full 10-bit accuracy.
This page synthesizes verified distributor data, drop-in family alternatives, pin-level guidance, and pricing context not consolidated in the manufacturer datasheet alone.
直接替換替代品，適用於 ATMEGA8535-16MJ — 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： ATMEGA8535-16MJ （相同外形與佔位） — 差異在於 Package, Serial Interfaces, Timers, ADC, EEPROM.
ATMEGA8535-16MU
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA8535-16MI
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8535L-8MI
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA8535L-8MU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8535-16MJ 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| 最大時脈頻率 | 16 MHz |
| Throughput | 16 MIPS at 16 MHz |
| Program Memory Size | 8 KB (4K x 16) Flash |
| Program Memory Type | In-System Programmable Flash with Read-While-Write |
| SRAM Size | 512 B |
| EEPROM Size | 512 B |
| Number of Instructions | 130 (most single-clock-cycle) |
| General Purpose Working Registers | 32 |
| GPIO Lines | 32 |
| ADC Channels | 8-channel 10-bit |
| Timer/Counters | 3 with compare modes |
| Communication Interfaces | USART, Two-Wire Serial Interface (TWI), SPI |
| 封裝 | 44-VQFN (7x7 mm) with Exposed Pad |
| 安裝類型 | Surface Mount |
ATMEGA8535-16MJ 44-vqfn (7x7 mm) with exposed pad 腳位配置指南
ATMEGA8535-16MJ（44-vqfn (7x7 mm) with exposed pad 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： ATMEGA8535-16MJ.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA8535-16MJ 適用於 6 應用s: Industrial Control and Automation, Data Acquisition Systems, HVAC and Building Automation, Battery Chargers and Power Management, Low-Cost Instrumentation, Automotive Accessory and Telematics Retrofit (Non-Qualified Use).
Industrial Control and Automation
The ATMEGA8535-16MJ fits industrial control nodes that need deterministic single-cycle instruction execution, three Timer/Counters with compare modes for sequencing, and USART plus TWI links to PLC-style supervisory systems. At 16 MHz the core delivers 16 MIPS, sufficient for relay logic replacement, pump/valve control loops, and MODBUS-over-UART polling at standard baud rates. The 8-channel 10-bit ADC monitors analog process variables such as pressure transducers and potentiometer setpoints without an external converter. The industrial-suffix 44-VQFN package with exposed pad supports thermally robust surface-mount assembly on control PCBs. Design consideration: the -16 speed grade targets the 5V supply rail typical of noisy factory environments, where its 5V noise margins outperform 3.3V MCUs.
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Data Acquisition Systems
For data loggers and distributed measurement nodes, the on-chip 8-channel 10-bit ADC is the defining advantage of the ATmega8535: up to eight single-ended analog inputs are sampled and converted on-chip, removing an external ADC and its SPI wiring from the BOM. The 512-byte EEPROM stores calibration constants across power cycles, while Read-While-Write Flash supports in-field firmware updates over the USART. Logged data streams out via the serial programmable USART to a host or via TWI to an external EEPROM or RTC. At 16 MHz, ADC sampling and UART transmission proceed concurrently with control code. The 44-VQFN 7x7 mm footprint keeps the analog front-end compact; route AVCC and ground returns carefully to preserve 10-bit accuracy across all eight channels.
推薦
HVAC and Building Automation
Thermostats, fan-coil controllers, and zone-control boards benefit from the ATMEGA8535-16MJ's combination of ADC inputs for temperature sensors (thermistors on the 8-channel 10-bit ADC), TWI for connecting RTC and display peripherals, and USART for RS-485 gateway bridging. The three Timer/Counters generate PWM signals for damper actuators and variable-speed fan control, while 32 GPIO lines drive relays and read switch inputs directly. The 5V industrial operating profile matches legacy building-automation supply rails, and the 512-byte EEPROM preserves setpoints during outages. Design tip: use the internal RC oscillator for non-timing-critical boards, or an external crystal when baud-rate accuracy for RS-485 communication must stay within tolerance over temperature.
推薦
Battery Chargers and Power Management
Smart charger controllers use the ATmega8535's Timer/Counter compare modes to generate charge PWM at kilohertz rates, while the 8-channel 10-bit ADC reads battery voltage, current-shunt amplifiers, and NTC temperature inputs simultaneously - enabling CC/CV and temperature-terminated charge profiles in firmware. The USART reports charge state to a host, and TWI connects gas-gauge or protection ICs. The 5V-tolerant 16 MHz profile provides the processing headroom for state-machine charge control with margin. Design consideration: allocate one Timer/Counter exclusively to the switching loop so ADC servicing and communication interrupts never disturb the PWM duty cycle, and synchronize ADC sampling to PWM edges in software for ripple-free current readings.
推薦
Low-Cost Instrumentation
Bench instruments, panel meters, and handheld test devices leverage the ATmega8535's balanced resource set: 10-bit ADC for measurement input, TWI to drive LCD or OLED front-ends, USART for PC connectivity, and 8 KB Flash for UI and math code. Most of the 130 AVR instructions execute in a single 62.5 ns clock cycle at 16 MHz, so fixed-point averaging and scaling arithmetic runs comfortably at meter update rates. The 512-byte EEPROM stores calibration factors, and 32 GPIO directly drive keypad matrices and indicator LEDs. The 44-VQFN 7x7 mm package suits compact enclosures, while the exposed pad eases heat dissipation from the regulator-shared ground plane. Keep analog traces short to the ADC pins for best resolution.
推薦
Automotive Accessory and Telematics Retrofit (Non-Qualified Use)
For non-safety 12V vehicle accessories - retro-fit alarm modules, gauge converters, light controllers - the ATmega8535-16MJ's 5V speed grade matches classic 5V-regulated accessory rails, and its ADC digitizes analog sensor taps while Timer/Counter PWM drives lamps and buzzers. The USART handles K-line style serial diagnostics, and TWI connects to EEPROM keys or CAN gateway daughterboards. Note explicitly: this part is not AEC-Q100 qualified, so it is appropriate only for retrofit, aftermarket, and non-automotive-grade designs; qualified volume production should use an automotive AVR such as the ATmega64M1 family instead. Ensure load-dump transients are clamped upstream of the 5V regulator feeding the MCU.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA8535-16MJ — 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 | ATMEGA8535-16MU | ATMEGA8535-16MI | ATMEGA8535L-8MI | ATMEGA8535L-8MU |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) with Exposed Pad | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 8 MHz |
| Flash Program Memory | 8 KB (4K x 16) | 8 KB (4K x 16) | 8 KB (4K x 16) | 8 KB (4K x 16) | 8 KB (4K x 16) |
| SRAM | 512 B | 512 B | 512 B | 512 B | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| Supply Profile | 5V speed grade (-16) | 5V speed grade (-16) | 5V speed grade (-16) | Low-voltage L grade | Low-voltage L grade |
主要差異化特點
- Full-speed 16 MHz operation in the VQFN package (對比ATMEGA8535L-8MI)
- Compact 7x7 mm surface-mount footprint with exposed pad (對比ATMEGA8535-16PU (PDIP 40))
- Same silicon, second-source suffix availability (對比ATMEGA8535-16MU)
設計說明
The -16 speed grade is rated for 5V operation (the L suffix variants are the low-voltage/8 MHz parts). Provide independent decoupling on VCC and AVCC - a 100 nF ceramic directly at each supply pin plus bulk 10 uF - and join AVCC to VCC through a low-pass filter (10 ohm resistor or ferrite plus 100 nF) when ADC accuracy matters, per the supply section of the Microchip ATmega8535 datasheet. Do not feed AVCC from a switching regulator rail without filtering; ADC noise will otherwise dominate the 10-bit conversion accuracy.
The 44-VQFN 7x7 mm exposed pad must be soldered to a grounded thermal pad array on the PCB - the exposed pad is the primary ground and thermal path, and floating it degrades both reliability and ADC reference stability. Use 4x4 via-in-pad arrays (approximately 0.3 mm vias) to tie the pad to the ground plane. Define the land pattern per the Microchip QFN footprint recommendation in the datasheet package drawing, and note pin-1 marker orientation before stencil cutting.
Keep the 8 ADC input traces (PA0-PA7) short and away from USART/SPI clock lines; at 16 MHz the SPI edges can couple into high-impedance analog inputs. Add series 1 kOhm resistors plus 100 nF to ground on long sensor leads to form an anti-aliasing RC (approximate 1.6 kHz cutoff) ahead of the 10-bit ADC. Estimated: with 10 kOhm source impedance, ADC sample-and-hold acquisition completes correctly within the datasheet-recommended source-resistance limits; above that, add a rail-to-rail op-amp buffer.
Do not swap footprint-compatible suffixes carelessly: only -MJ, -MU, -MI, and the L-grade 44-VQFN parts share the VQFN footprint; the -16AU (TQFP) and -16PU (PDIP) variants of the same silicon use different packages and are not drop-in. Also verify supply rails before substituting L-grade parts into a 5V board - they are low-voltage, 8 MHz devices. Finally, mature-AVR sourcing means open-market parts carry counterfeit risk; buy franchised or inspected stock only.
合規資訊
Compliance status not stated in the retrieved web data. The MJ/MU suffix family is generally lead-free/RoHS per Microchip coding conventions, but this must be confirmed from the official Microchip product page or datasheet before use in regulated markets. Not AEC-Q100 qualified - not for automotive-qualified production designs.