ATMEGA8535L-8JJ - 8KB AVR MCU, 8MHz, 44-PLCC | Microchip
MPN: ATMEGA8535L-8JJ ✗ סוף ייצורATMEGA8535L-8JJ סקירה
An AVR microcontroller is a family of 8-bit Harvard-architecture MCUs from Microchip (originally Atmel) that executes most instructions in a single clock cycle. Within the product hierarchy, the ATmega8535 sits at: microcontroller -> 8-bit MCU -> AVR ATmega family. Because program memory and data memory are separate buses, the AVR can achieve up to 16 MIPS throughput at 16 MHz, delivering performance typically requiring larger clock speeds in CISC architectures.
Key features include 130 powerful RISC instructions (most single-cycle), 32 general-purpose working registers, 32 programmable I/O lines, and three flexible Timer/Counters with compare modes. The device also integrates a byte-oriented Two-wire Serial Interface (TWI, I2C-compatible), a serial programmable USART, an SPI interface, and internal/external interrupt sources. The 10-bit ADC resolves 8 single-ended channels, suitable for sensor interfaces in cost-sensitive designs.
The L suffix denotes the low-voltage product grade, operating from 2.7V to 5.5V with a maximum clock of 8 MHz, versus the 16 MHz standard grade. Self-programming Flash with Read-While-Write support enables field firmware updates without external programmers, while ISP via SPI simplifies production programming.
Typical applications include industrial control boards, sensor data acquisition systems, motor control auxiliaries, and legacy embedded systems where the 44-PLCC footprint must be maintained for socketed or board-level compatibility.
Designers should note the 8 MHz limit of the L-grade part: designs requiring 16 MHz throughput must use the standard-grade ATmega8535 variant instead.
This page synthesizes verified distributor pricing, drop-in alternatives, pinout details, and practical design notes beyond what the manufacturer datasheet provides.
חלופות תחליף ישיר עבור ATMEGA8535L-8JJ — 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 ATMEGA8535L-8JJ (אותו גורם צורה וטביעת רגל) — שונים ב Mounting Type, Package, Flash Program Memory, SRAM, ADC.
ATMEGA8535L-8JI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA8535-16PJ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA8535-16JI
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
AT90S8535-8JC
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ATMEGA8535L-8JJ דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | AVR 8-bit RISC |
| Flash Program Memory | 8 KB |
| SRAM | 512 bytes |
| EEPROM | 512 bytes |
| תדר שעון מקסימלי | 8 MHz |
| Maximum Throughput | Up to 16 MIPS at 16 MHz (family) |
| Instructions | 130 powerful instructions, most single-cycle |
| ADC | 8-channel, 10-bit |
| General Purpose I/O | 32 lines |
| Working Registers | 32 general purpose |
| Timers/Counters | Three flexible Timer/Counters with compare modes |
| Serial Interfaces | USART, Two-wire Serial Interface (TWI/I2C-compatible), SPI |
| מארז | 44-PLCC (J) |
| סוג הרכבה | Surface Mount |
| מספר פינים | 44 |
| Flash Organization | 4K x 16 (self-programming, Read-While-Write) |
| In-System Programming | Yes (ISP via SPI) |
תצורת פינים של ATMEGA8535L-8JJ
| פין 1 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 input |
| פין 2 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 input |
| פין 3 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 input |
| פין 4 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 input |
| פין 5 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 input |
| פין 6 | AREF — Analog reference voltage for ADC |
| פין 7 | AVCC — Analog supply voltage for ADC |
| פין 8 | PB0 (SS) — Port B bit 0 / SPI Slave Select |
| פין 9 | PB1 (T1) — Port B bit 1 / Timer1 external clock input |
| פין 10 | PB2 (AIN0) — Port B bit 2 / Analog Comparator positive input |
| פין 11 | PB3 (AIN1) — Port B bit 3 / Analog Comparator negative input |
| פין 12 | PB4 (SS) — Port B bit 4 / SPI Slave Select |
| פין 13 | PB5 (MOSI) — Port B bit 5 / SPI Master Output Slave Input |
| פין 14 | PB6 (MISO) — Port B bit 6 / SPI Master Input Slave Output |
| פין 15 | PB7 (SCK/OC0) — Port B bit 7 / SPI Clock or Timer0 output compare |
| פין 16 | PC0 (SCL) — Port C bit 0 / TWI clock |
| פין 17 | PC1 (SDA) — Port C bit 1 / TWI data |
| פין 18 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| פין 19 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| פין 20 | PC4 (TDO) — Port C bit 4 / JTAG test data out |
| פין 21 | PC5 (TDI) — Port C bit 5 / JTAG test data in |
| פין 22 | PC6 (TOSC1) — Port C bit 6 / Timer oscillator input |
| פין 23 | PC7 (TOSC2) — Port C bit 7 / Timer oscillator output |
| פין 24 | PD0 (RXD) — Port D bit 0 / USART receive |
| פין 25 | PD1 (TXD) — Port D bit 1 / USART transmit |
| פין 26 | PD2 (INT0) — Port D bit 2 / External interrupt 0 |
| פין 27 | PD3 (INT1) — Port D bit 3 / External interrupt 1 |
| פין 28 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B |
| פין 29 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A |
| פין 30 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| פין 31 | PD7 (OC2) — Port D bit 7 / Timer2 output compare |
| פין 32 | VCC — Digital supply voltage |
| פין 33 | GND — Digital ground |
| פין 34 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 input |
| פין 35 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 input |
| פין 36 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 input |
| פין 37 | PE0 (ICP3/CLKO) — Alternate-function pin (per datasheet pin configuration) |
| פין 38 | XTAL1 — External clock input / crystal in |
| פין 39 | XTAL2 — Crystal output / oscillator amplifier output |
| פין 40 | RESET — Active-low reset input |
| פין 41 | NC — Not connected (per datasheet) |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
ATMEGA8535L-8JJ מתאים עבור 6 יישוםs: Industrial Control Boards, Sensor Data Acquisition Systems, Legacy Embedded System Maintenance, Motor Control Auxiliaries, Instrumentation and Test Fixtures, Smart Home and IoT Sensor Nodes.
Industrial Control Boards
The ATMEGA8535L-8JJ fits industrial control and automation boards where deterministic single-cycle RISC execution and 32 GPIO lines drive relays, contactors, and status indicators. Its three Timer/Counters with compare modes generate PWM outputs and precise event timing, while the USART connects to SCADA or HMI front ends. The 44-PLCC package is socket-compatible in many legacy industrial designs, allowing controller replacement without reflow rework. With 8 KB Flash and 512 B EEPROM, it stores calibration tables and parameter sets that survive power cycles, and the 10-bit ADC digitizes potentiometer or transducer setpoints. Maintenance of these mature boards is a primary remaining use case for this end-of-life part.
מומלץ
Sensor Data Acquisition Systems
The integrated 8-channel 10-bit ADC makes the ATMEGA8535L-8JJ well suited to multi-sensor acquisition nodes such as temperature, pressure, and level monitoring panels. Eight single-ended analog inputs (PA0-PA7) digitize sensor channels without an external ADC, reducing BOM cost and board area, while the TWI/I2C bus expands channel count with external converters when more than eight inputs are needed. At 8 MHz the core delivers roughly 8 MIPS, sufficient to sample several channels at hundreds of samples per second with filtering. AREF/AVCC pins support precision railed analog references. Data can be streamed over USART or buffered to the 512-byte EEPROM for event logging.
מומלץ
Legacy Embedded System Maintenance
Many installed products - metering equipment, medical accessories, and test fixtures - were designed around the ATmega8535 in 44-PLCC sockets, and the ATMEGA8535L-8JJ remains the direct maintenance component for these fleets. Because the PLCC package is socketed in most such designs, field service technicians can swap the MCU without soldering equipment. Self-programming Flash with Read-While-Write supports in-field bootloader firmware updates over the existing USART or TWI link, avoiding product recalls. Procurement teams should perform last-time-buy evaluation now given end-of-life status, or qualify the same-die TQFP variants (ATMEGA8535L-8AJ/8AU) with PLCC-to-TQFP adapters where sockets permit.
מומלץ
Motor Control Auxiliaries
For brushed DC motor and stepper motor control, the ATMEGA8535L-8JJ generates PWM via its Timer/Counter compare outputs and reads feedback from current shunts or position potentiometers through the 10-bit ADC. At 8 MHz, PWM frequencies in the kilohertz range with 8-bit resolution are achievable, adequate for speed and direction control in pumps, fans, and small conveyors. The 32 GPIO lines interface to H-bridge driver ICs and limit switches. Note the device lacks complementary PWM outputs and hardware dead-time insertion, so complex three-phase drives need external logic or a newer MCU; within those limits it provides a complete, low-cost control solution.
מומלץ
Instrumentation and Test Fixtures
Bench instruments and production test fixtures benefit from the ATMEGA8535L-8JJ's combination of a 10-bit ADC for measurement capture, USART for PC communication, and SPI for controlling DACs, digital potentiometers, and relay banks. The Harvard architecture executes control loops with deterministic timing, while 8 KB Flash holds test sequences and lookup tables and 512 B EEPROM stores calibration constants between calibration cycles. The 44-PLCC package fits the socketed MCU carriers common in fixture electronics. Its low-voltage L-grade operation also permits 3.3V logic interfacing with modern instruments when clocked within the low-voltage frequency envelope.
מומלץ
Smart Home and IoT Sensor Nodes
The ATMEGA8535L-8JJ can serve low-power connected nodes using its wide L-grade supply range down to roughly 2.7V, allowing operation directly from three alkaline cells or a single lithium cell via LDO. The TWI (I2C) bus attaches humidity, temperature, and proximity sensors, while the 10-bit ADC reads battery voltage and analog sensors for health monitoring. Firmware can place the static core in sleep and wake on external interrupts to extend battery life. Communication to a gateway runs over the USART at up to 115.2 kbaud. For new IoT designs, newer AVRs with built-in connectivity are preferable, but this part suits maintenance and retrofit projects.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ATMEGA8535L-8JJ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ATMEGA8535L-8JI | ATMEGA8535-16PJ | AT90S8535-8JC | ATMEGA8535L-8AJ |
|---|---|---|---|---|---|
| Package | 44-PLCC | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-TQFP - different (adapter needed) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel legacy) | Microchip Technology |
| Max Clock Frequency | 8 MHz | 8 MHz | 16 MHz | 8 MHz | 8 MHz |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| EEPROM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| GPIO Count | 32 lines | 32 lines | 32 lines | 32 lines | 32 lines |
| Lifecycle Status | EOL / last-time-buy | EOL | Mature / limited availability | Obsolete | EOL |
מבדילים עיקריים
- Same-package L-grade availability (לעומתATMEGA8535-16PJ)
- Self-programming Flash with Read-While-Write (לעומתAT90S8535-8JC)
- PLCC footprint preserved across family (לעומתATMEGA8535L-8AJ)
הערות תכנון
Decouple VCC and AVCC separately: place a 100 nF ceramic capacitor within a few millimeters of each pin plus one 10 uF bulk capacitor per supply rail. AVCC should be connected to VCC through a low-pass LC filter (10 uH + 100 nF) when ADC accuracy matters, and AREF must be decoupled with 100 nF to ground. Estimated: with 8 MHz clock and typical I/O loading, current draw stays in the low tens of mA - well within PLCC-44 thermal capability, so no heatsinking is needed.
Do not clock the L-grade part above 8 MHz - overclocking the low-voltage grade outside its safe voltage-frequency envelope causes unreliable flash reads and brown-outs. If the design needs 16 MHz, use the standard-grade ATMEGA8535-16PJ instead. Also verify fuse settings (CKOPT, BOD level) before first programming; enabling brown-out detection around 2.7-4.0V depending on supply prevents EEPROM corruption during brown-out events, a well-documented failure mode in AVR designs.
For socketed PLCC applications, inspect socket contacts during service swaps - PLCC sockets develop intermittent contact oxidation that mimics MCU failure. Keep the analog ground return of AREF/AVCC star-connected to the main ground plane to avoid digital switching noise modulating ADC readings. Route SPI and TWI bus traces short; TWI requires 4.7 kilo-ohm pull-ups on SCL/SDA per datasheet recommendations. Reserve ISP header access on production boards since the parallel High-Voltage programming recovery path needs full pin access that sockets may block.
Clock source quality matters: a crystal with 12-22 pF load capacitors at XTAL1/XTAL2 gives the most stable 8 MHz operation, while external clock drive should use a clean square wave with rise times under 10 ns. Keep the crystal loop traces under 15 mm and guard with ground. For the ADC, sample when digital I/O activity is minimal (e.g., use ADC Noise Canceler sleep mode) - the 10-bit converter loses effective bits when switching noise couples in through AVCC.
מידע על תאימות
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