ATMEGA8535-16JJ - 8-Bit AVR MCU 16MHz 8KB Flash | Microchip
MPN： ATMEGA8535-16JJ ✓ 啟用中ATMEGA8535-16JJ 概覽
A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest tier of the embedded computing hierarchy (MCU -> embedded processor -> system-on-chip). The AVR family uses a modified Harvard architecture with a mostly single-cycle instruction set, which is why an 8-bit AVR core can achieve 1 MIPS per MHz of clock frequency, classifying the ATmega8535 within the broader categories of 8-bit microcontroller and embedded processor IC.
Key features include 8 KB of self-programmable Flash with Read-While-Write support, 32 general purpose I/O lines, 32 general purpose working registers, three flexible Timer/Counters with compare modes, a programmable serial USART, a byte-oriented Two-wire Serial Interface (TWI/I2C), and an 8-channel 10-bit ADC. The 16 MHz speed grade requires a 4.5 V to 5.5 V supply, making this part suitable for 5 V industrial logic environments.
Architecturally, the AVR core executes most instructions in a single clock cycle through its pipelined fetch/execute scheme, while separate Flash, SRAM, and EEPROM memories allow program and data to be accessed concurrently. In-system programming via the SPI port enables field firmware updates without removing the device from the board.
Typical applications include industrial control panels, sensor acquisition nodes using the 8-channel ADC, motor control with timer PWM outputs, and legacy 5 V equipment maintenance where PLCC sockets allow easy replacement.
When designing with the ATMEGA8535-16JJ, verify the 5 V supply rail and observe ADC reference and clock source trade-offs - higher clock speeds increase ADC noise, so consider prescaling the ADC clock.
This page synthesizes distributor availability, drop-in alternatives, and practical design guidance not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 ATMEGA8535-16JJ — 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： ATMEGA8535-16JJ （相同外形與佔位） — 差異在於 Package, Communication Interfaces, Instructions, ADC, Flash Program Memory.
ATMEGA8535-16JI
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA8535-16JC
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8535L-8JJ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8515-16JI
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8515-16JC
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA8535-16JJ 最大額定值與電氣特性
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 16 MHz |
| Performance | 16 MIPS at 16 MHz |
| Program Memory Size | 8 KB (4K x 16) Flash |
| Program Memory Type | In-System Programmable Flash |
| EEPROM Size | 512 bytes |
| SRAM Size | 512 bytes |
| GPIO Count | 32 |
| ADC Channels | 8-channel 10-bit |
| Communication Interfaces | USART, TWI (I2C), SPI |
| Timers | 3 Timer/Counters with compare modes |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| 封裝 | 44-PLCC (16.6 x 16.6 mm) |
| 安裝類型 | Surface Mount (J-Lead) |
| Interrupts | Internal and external interrupts |
| Programming Interface | SPI In-System Programming |
ATMEGA8535-16JJ 44-plcc (16.6 x 16.6 mm) 腳位配置指南
ATMEGA8535-16JJ（44-plcc (16.6 x 16.6 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： ATMEGA8535-16JJ.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA8535-16JJ 適用於 6 應用s: Industrial Control Panels, Multi-Channel Sensor Acquisition, Motor Control and PWM Generation, Legacy 5V Equipment Maintenance, Embedded Communication Nodes, Test Fixtures and Development Boards.
Industrial Control Panels
The ATMEGA8535-16JJ fits industrial control panels because its 4.5 V to 5.5 V supply matches legacy 5 V relay-driver and optocoupler logic, its 32 GPIO lines directly drive indicator banks and read switch matrices, and the 44-PLCC package is available in socketed form for field serviceability. At 16 MHz the core delivers 16 MIPS, enough headroom for scan loops, debounce logic, and communication handling in a single deterministic cycle budget. The three Timer/Counters with compare modes generate PWM or timing interrupts without CPU load, while external interrupt pins handle operator inputs. Its 8 KB Flash with Read-While-Write supports firmware field updates through the SPI ISP interface, reducing maintenance downtime in installed panels.
推薦
Multi-Channel Sensor Acquisition
The defining feature for sensor nodes is the 8-channel 10-bit ADC, which lets one ATMEGA8535-16JJ digitize up to eight analog inputs such as temperature, pressure, and level transducers without external multiplexers. The 10-bit resolution yields roughly 4.9 mV steps on a 5 V reference, adequate for most ratiometric industrial sensors. AVCC and AREF pins allow a separate clean analog supply and reference, improving conversion accuracy. The 512-byte SRAM buffers sample sets while the 512-byte EEPROM stores calibration constants that survive power cycles. Data is streamed over the hardware USART to a host or logged to EEPROM, and the SPI port supports external ADC front-ends when higher resolution is needed.
推薦
Motor Control and PWM Generation
Three Timer/Counters with compare modes make the ATMEGA8535-16JJ suitable for DC motor speed control and servo sequencing. Two 8-bit timers and one 16-bit timer generate phase-correct or fast PWM outputs; at 16 MHz, 8-bit PWM reaches approximately 62.5 kHz, beyond audible range for fan and pump control. The 32 GPIO lines drive H-bridge enable inputs and direction relays directly through transistor buffers, while the ADC can read back motor current via a shunt for closed-loop torque limiting. The 16 MIPS instruction throughput keeps the control loop latency low, and input-capture capability on the 16-bit timer measures tachometer pulse periods for speed feedback with high resolution.
推薦
Legacy 5V Equipment Maintenance
Many installed industrial and telecom boards from the 1990s and 2000s were designed around socketed PLCC AVR and 8051-class parts running at 5 V. The ATMEGA8535-16JJ in its 44-PLCC J-lead package drops into these sockets, preserving the 4.5 V to 5.5 V logic levels of surrounding TTL/CMOS devices without level shifters. Because Microchip still actively manufactures the ATmega8535, repair shops can source original silicon rather than scavenged or counterfeit parts. In-system programming through the SPI port allows remanufacturers to load updated or replacement firmware onto repaired boards, and the ATmega8515 pin-compatible sibling covers boards that never used the ADC.
推薦
Embedded Communication Nodes
The ATMEGA8535-16JJ includes a full hardware USART and a byte-oriented Two-wire Serial Interface (TWI, compatible with I2C), enabling it to act as either a protocol converter or a networked node. Typical topologies connect the USART to an RS-485 transceiver for multi-drop field buses, while TWI links up to local EEPROMs, RTCs, and displays at 100-400 kHz. The 8 KB Flash accommodates protocol stacks plus application logic, and the 512-byte SRAM buffers serial frames. Deterministic AVR single-cycle execution simplifies baud-rate and timing calculations. Because both interfaces run in hardware, the CPU remains free for data handling, and the SPI port can simultaneously program the device in-circuit during production.
推薦
Test Fixtures and Development Boards
Universities, makers, and production test engineers use the ATMEGA8535-16JJ in educational AVR trainer boards and bed-of-nails test fixtures. The 44-PLCC package mates with zero-insertion-force sockets, allowing rapid device swaps during firmware iteration, and ISP over SPI means no socketing cycle is required after initial wiring. With 32 GPIO brought to header rows, the device exercises external memory, keyboards, LCDs, and ADC channels in one fixture. The 16 MHz speed grade matches standard crystal values, avoiding custom oscillator components. Its long production history guarantees code examples and toolchain support in AVR-GCC, Microchip Studio, and legacy AVR Studio projects remain abundant and well documented.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA8535-16JJ — 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 | ATMEGA8535-16JI | ATMEGA8535-16JC | ATMEGA8535L-8JJ | ATMEGA8515-16JI |
|---|---|---|---|---|---|
| Package | 44-PLCC (16.6 x 16.6 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 16 MHz |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 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 | Yes, 8-channel | Yes, 8-channel | No |
| SRAM / EEPROM | 512 B / 512 B | 512 B / 512 B | 512 B / 512 B | 512 B / 512 B | 512 B / 512 B |
主要差異化特點
- Full 16 MHz speed at 5 V in PLCC package (對比ATMEGA8535L-8JJ)
- Integrated 8-channel 10-bit ADC (對比ATMEGA8515-16JI)
- Industrial temperature option on identical footprint (對比ATMEGA8535-16JC)
設計說明
The ATMEGA8535-16JJ requires a 4.5 V to 5.5 V supply at the 16 MHz speed grade; derating to 3.3 V forces a clock reduction to about 8 MHz, which is what the ATMEGA8535L variants allow. Decouple VCC with a 100 nF ceramic capacitor placed within a few millimeters of each VCC pin pair and add 10 uF of bulk capacitance per board. Connect AVCC to a filtered analog supply (ferrite bead plus 100 nF) separate from digital VCC to preserve ADC accuracy on the 8-channel converter.
The 44-PLCC J-lead footprint needs care for rework: PLCC solder joints are hidden under the body, so inspect with angled lighting or X-ray and avoid excessive reflow cycles. If the board uses a PLCC socket (common on legacy maintenance boards), specify a quality machine-tooled socket to prevent contact oxidation. Keep the SPI ISP header traces (SCK, MOSI, MISO, RESET) short and add series resistors of about 100 ohms if the same lines drive other loads, preventing programming conflicts during in-system flashing.
Do not assume PLCC-44 pin numbering matches TQFP-44 even though the die is identical - the PLCC numbering runs counterclockwise from the index notch and will destroy the device if transposed. Also verify the ADC prescaler: at 16 MHz, full-speed ADC clocks exceed the recommended range, so configure the prescaler for an ADC clock around 100-200 kHz for full 10-bit resolution. Finally, confirm the commercial temperature grade suits the enclosure; for harsh environments specify the ATMEGA8535-16JI industrial variant instead.
合規資訊
Compliance status not stated in the provided web data; confirm RoHS/REACH status on the official Microchip product page or with the distributor before ordering.
