ATMEGA8535L-8JI - 8KB Flash AVR MCU 44-PLCC | Microchip
MPN： ATMEGA8535L-8JI ✓ 啟用中ATMEGA8535L-8JI 概覽
An AVR microcontroller is a family of 8-bit reduced-instruction-set (RISC) MCUs in the broader hierarchy of microcontroller -> embedded processor -> integrated circuit. AVR cores execute most instructions in a single clock cycle, and the ATmega8535 achieves up to 16 MIPS throughput at 16 MHz across the family, making it a classic choice for deterministic, low-power embedded control.
Key features of the ATMEGA8535L-8JI include the advanced RISC architecture with 130 powerful instructions and 32 general-purpose working registers, fully static operation, In-System Programmable (ISP) Flash for field firmware updates, and the L suffix indicating a wide 2.7V to 5.5V supply range. The J suffix denotes the 44-lead PLCC package, and the I suffix grades the device for -40C to +85C industrial environments.
Technically, the Harvard architecture separates program and data buses, allowing the single-cycle instruction fetch that gives AVR its high code efficiency. On-chip peripherals such as the 8-channel 10-bit ADC, timers/counters, UART, and SPI reduce external component count. The 8 MHz rating of the L-speed grade balances performance with the low-voltage operating window.
Typical applications include industrial control panels, sensor data acquisition nodes using the 8-channel ADC, motor control and appliance boards, and legacy AVR system maintenance where the PLCC-44 socketed footprint must be preserved.
A key design consideration: the L grade runs up to 8 MHz across the full 2.7V to 5.5V range; if your board runs at 5V and needs 16 MHz, choose the ATMEGA8535-16JI speed grade instead.
This page synthesizes distributor availability, drop-in same-package alternatives, and practical design guidance not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 ATMEGA8535L-8JI — 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： ATMEGA8535L-8JI （相同外形與佔位） — 差異在於 Flash Program Memory, SRAM, Package, In-System Programming, Instructions.
ATMEGA8535-16JI
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA8535L-8JC
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA8535-16JC
✅ 直接替換聯絡詢價
查看資料表 →AT90S8535-8JI
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA8515-16JI
✅ 直接替換聯絡詢價
查看資料表 →ATMEGA8535L-8JI 最大額定值與電氣特性
| Core Architecture | 8-bit AVR RISC |
| Flash Program Memory | 8 KB In-System Programmable |
| SRAM | 512 B |
| EEPROM | 512 B |
| Max Clock Frequency | 8 MHz |
| Throughput (family max) | 16 MIPS at 16 MHz |
| Instruction Count | 130 instructions |
| General Purpose Registers | 32 x 8-bit |
| ADC | 8-channel, 10-bit |
| Operating Voltage Range (L grade) | 2.7 V to 5.5 V |
| 工作溫度 | -40C to +85C |
| 封裝 | 44-PLCC (16.6 x 16.6 mm) |
| 安裝類型 | Surface Mount |
| In-System Programming | Yes (ISP Flash) |
| Fully Static Operation | Yes |
ATMEGA8535L-8JI 44-plcc (16.6 x 16.6 mm) 腳位配置指南
ATMEGA8535L-8JI（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： ATMEGA8535L-8JI.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA8535L-8JI 適用於 6 應用s: Industrial Control Panels, Analog Sensor Data Acquisition, Motor Control and Home Appliances, Legacy AVR System Maintenance, Battery-Powered Instruments, Embedded Training and Prototyping.
Industrial Control Panels
The ATMEGA8535L-8JI fits industrial control panels because its -40C to +85C I-grade temperature rating and 2.7V to 5.5V supply tolerance cover the harsh electrical and thermal environments of factory cabinets. The 32 I/O lines across four 8-bit ports (PA-PD) drive relays, optocouplers, and front-panel indicators directly, while the 8 KB ISP Flash accommodates ladder-style state machine code. Deployed between a 5V industrial rail with local 100 nF decoupling, the AVR's fully static core tolerates slow clocking for power savings during idle periods. A quantified benefit: single-cycle instruction execution at 8 MHz yields 8 MIPS of deterministic throughput, enough for millisecond-class scan loops in PLC-style I/O handling without an RTOS.
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Analog Sensor Data Acquisition
With its 8-channel 10-bit ADC, the ATMEGA8535L-8JI is a natural single-chip acquisition node for temperature, pressure, and voltage sensor arrays. Eight sensor inputs are multiplexed into one 10-bit converter (1024 counts), adequate for roughly 0.5% full-scale accuracy with a clean AREF. The L-grade wide 2.7V to 5.5V supply allows direct interfacing with 3.3V sensor front ends. In a typical topology, sensors feed the PA port ADC channels through RC anti-alias filters, and results are streamed over the UART or SPI to a host. Because conversion is performed on-chip, the BOM avoids a separate ADC IC, and the 512 B EEPROM stores per-channel calibration constants through power cycles.
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Motor Control and Home Appliances
The ATMEGA8535L-8JI suits appliance and small-motor control boards where timer-based PWM and interrupt-driven supervision run on a low-cost 8-bit core. The AVR timer/counter peripherals generate PWM outputs for motor drivers while the ADC reads back current or position sensors on the remaining channels. The industrial -40C to +85C rating survives the elevated ambient near motors and heating elements, and the ISP Flash permits field firmware updates during appliance service. Running at 8 MHz on a 5V rail, the device toggles GPIO with sufficient edge rate for standard MOSFET gate drivers. Its 130-instruction RISC core keeps interrupt latency short and predictable, which matters for commutation timing in fan and pump applications.
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Legacy AVR System Maintenance
Many installed industrial and commercial products were built around the socketed ATmega8535 in PLCC-44, and the ATMEGA8535L-8JI is the direct sustaining part for these systems. Because the J-suffix package plugs into the same 44-pad PLCC socket, replacement requires no PCB rework - extract the old device with a PLCC extraction tool and insert the new one with pin 1 oriented to the socket bevel. Reflash the original firmware through ISP, verify the fuse bits (clock source, BOD level), and the system returns to service. Distributors such as Rochester Electronics and LCSC stock this MPN specifically to serve the installed-base maintenance market, making it a low-risk continuity purchase for MRO teams.
推薦
Battery-Powered Instruments
The 2.7V to 5.5V supply range of the L speed grade lets the ATMEGA8535L-8JI run directly from a 3V lithium coin cell or three NiMH cells without a regulator, a decisive advantage in portable instrumentation. Because the AVR core is fully static, the clock can be stopped or slowed to stretch battery life, and the 512 B EEPROM retains readings and calibration between battery changes. A typical handheld meter uses one ADC channel for the measurand, several GPIO for keypad scanning, and the UART for occasional PC upload. At 8 MHz the part completes burst measurements quickly and then drops into idle, trading the 16 MHz throughput of the non-L grades for the low-voltage window this class of product requires.
推薦
Embedded Training and Prototyping
The ATmega8535 remains a popular teaching platform because its 8 KB Flash, 512 B SRAM, 8-channel 10-bit ADC, and clearly documented 130-instruction AVR core fit an entire embedded-systems curriculum - from GPIO and timers to ADC and serial communication - on one readable datasheet. The 44-PLCC packaged ATMEGA8535L-8JI drops into zero-insertion-force PLCC sockets on training boards, allowing students to swap devices without soldering. The wide 2.7V to 5.5V operating range protects novice designs built on USB 5V or bench 3.3V supplies alike. University labs value that the identical die is available in DIP-style and TQFP grades, so one codebase, one programmer, and one set of fuse settings serve every board variant in the classroom.
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推薦產品摘要
工程參考資料，適用於 ATMEGA8535L-8JI — 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 | ATMEGA8535L-8JC | ATMEGA8535-16JC | AT90S8535-8JI | ATMEGA8515-16JI |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (16.6 x 16.6 mm) | 44-PLCC - same footprint | 44-PLCC - same footprint | 44-PLCC - same footprint | 44-PLCC - same footprint | 44-PLCC - same footprint |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Max Clock Frequency | 8 MHz | 16 MHz | 8 MHz | 16 MHz | 8 MHz | 16 MHz |
| Operating Voltage | 2.7 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 | 4.0 V to 6.0 V | 4.5 V to 5.5 V |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| SRAM | 512 B | 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 | None |
| Operating Temperature | -40C to +85C | -40C to +85C | 0C to +70C | 0C to +70C | -40C to +85C | -40C to +85C |
主要差異化特點
- Wide 2.7V to 5.5V low-voltage supply range (對比ATMEGA8535-16JI)
- Industrial temperature grade for harsh environments (對比ATMEGA8535L-8JC)
- Integrated 8-channel 10-bit ADC (對比ATMEGA8515-16JI)
- Active AVR ISP support vs legacy predecessor (對比AT90S8535-8JI)
設計說明
Respect the L-grade speed/voltage product: the ATMEGA8535L-8JI is limited to 8 MHz across its 2.7V to 5.5V range. Never select the external crystal fuse bit for a frequency above 8 MHz, as the non-L 16 MHz limit only applies to parts graded for 4.5V to 5.5V. Enable brown-out detection (BOD) in the fuse bits when running from industrial supplies so the MCU resets cleanly during supply dips; without BOD, a brown-out during EEPROM write can corrupt the 512 B EEPROM array.
For the PLCC-44 footprint, provide one 100 nF ceramic decoupling capacitor per VCC/GND pin pair, placed within 5 mm of the package, plus a bulk 10 uF at the board supply entry. Connect AVCC to VCC through a low-pass LC filter (10 uH + 100 nF) when the 10-bit ADC is used, and tie AREF to a clean reference with a 100 nF bypass. Note that PLCC J-leads are soldered under the package body - inspect with angled or X-ray vision on reworked boards, as J-lead joints are not visible from above.
Do not assume the TQFP-44 pin map when designing for or replacing this PLCC-44 device: the PLCC pin numbering (counterclockwise from the index notch) differs from TQFP ordering, so socket adapters and pin maps must follow the ATmega8535 datasheet PLCC diagram explicitly. Second, if substituting the ATMEGA8515-16JI to save cost, remember it lacks the 10-bit ADC entirely - firmware will hang reading ADC registers. Third, RESET on classic AVRs is active-low and needs a 10 kOhm pull-up; leaving it floating causes sporadic resets in electrically noisy industrial panels.
Estimated: at 5V and 8 MHz with all GPIO lightly loaded, classic ATmega8535-class devices dissipate on the order of tens of milliwatts, so the PLCC-44 package needs no heatsink in typical use. Verify against the datasheet active supply current at your exact VCC and frequency; only designs sourcing heavy DC current from many I/O pins (LED columns, relay drivers) approach meaningful dissipation - budget roughly VCC x I_total and compare against the package theta-JA from the datasheet.
合規資訊
Compliance status not stated in the retrieved web data. The I/J suffix part is an older Atmel grade; verify RoHS/lead-free status on the Microchip product page or with Rochester Electronics before export-controlled procurement.
