ATMEGA128L-8AN - 8MHz 128KB Flash AVR MCU | Microchip 64-TQFP (Tape & Reel)
MPN: ATMEGA128L-8AN ✓ פעילATMEGA128L-8AN סקירה
An AVR microcontroller is an 8-bit RISC (Reduced Instruction Set Computer) processor based on a Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in the same clock cycle. The ATmega128L belongs to the megaAVR family, which sits in the broader taxonomy of microcontroller -> embedded controller -> semiconductor IC. It is designed for embedded applications requiring deterministic real-time response, low power consumption, and integrated analog/digital peripherals.
Key features include 53 general-purpose I/O lines, 32 general-purpose working registers, four flexible Timer/Counters with compare modes and PWM, two USARTs, a byte-oriented Two-wire Serial Interface (TWI/I2C-compatible), an SPI serial interface, an 8-channel 10-bit successive-approximation ADC, a JTAG interface for on-chip debugging, and a watchdog timer with separate on-chip oscillator. The device supports supply voltages from 2.7 V to 5.5 V (the 'L' variant optimizes low-voltage operation versus the standard ATmega128).
The architecture uses an advanced RISC core with 133 powerful instructions, most executed in a single clock cycle. The integrated JTAG (IEEE 1149.1-compliant) interface supports boundary-scan and on-chip debug, simplifying in-system programming and field updates. The peripheral feature set is balanced for industrial control, human-interface designs, and battery-powered instrumentation.
Typical applications include industrial automation and control, low-power IoT edge nodes, embedded HMI panels, sensor data acquisition systems, motor control firmware platforms, and battery-powered portable instrumentation. The wide 2.7 V to 5.5 V supply range also makes it suitable for legacy 5 V systems as well as 3.3 V designs with adequate decoupling.
When designing with this part, ensure the JTAG pins are correctly terminated if the interface is unused, and respect the maximum clock frequency versus supply voltage tradeoff: at 2.7 V the device is rated up to 8 MHz, while higher frequencies require an external clock or crystal with proper load capacitor selection. Programming via SPI is also supported for bootloader-based field upgrades.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design considerations not found on a single datasheet page.
חלופות תחליף ישיר עבור ATMEGA128L-8AN — 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 ATMEGA128L-8AN (אותו גורם צורה וטביעת רגל) — שונים ב Package, Operating Temperature, Timers/Counters, RoHS Status, Communication Interfaces.
ATMEGA128L-8AU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA128L-8MN
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA128L-8MNR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA128-16AN
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA128-16AI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ATMEGA128L-8AN דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 128 KB (64K x 16) |
| SRAM | 4 KB |
| EEPROM | 4 KB |
| תדר שעון מקסימלי | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| GPIO Pins | 53 |
| ADC | 8-channel, 10-bit |
| Timers/Counters | 4 flexible Timer/Counters with PWM |
| Communication Interfaces | 2x USART, SPI, TWI (I2C-compatible) |
| JTAG Interface | Yes (IEEE 1149.1-compliant, on-chip debug) |
| מארז | 64-pin TQFP (14x14 mm), 1 mm height, Tape & Reel |
| סוג הרכבה | Surface Mount |
| טמפרטורת פעולה | Industrial, -40C to +85C (R suffix indicates T&R packaging) |
| Watchdog Timer | Yes, with separate on-chip oscillator |
| Instruction Set | 133 powerful instructions, mostly single-cycle |
| Throughput | Up to 1 MIPS per MHz |
| סטטוס RoHS | Compliant (Green, Pb-free) |
תצורת פינים של ATMEGA128L-8AN
| פין 1 | VCC — Digital supply voltage (2.7 V to 5.5 V) |
| פין 2 | PE0 (RXD0/PDI) — Port E bit 0 / USART0 RXD / Programming Data In |
| פין 3 | PE1 (TXD0/PDO) — Port E bit 1 / USART0 TXD / Programming Data Out |
| פין 4 | PE2 (AIN0/XCK0) — Port E bit 2 / Analog comparator input 0 / USART0 clock |
| פין 5 | PE3 (AIN1/OC3A) — Port E bit 3 / Analog comparator input 1 / Timer3 Compare A |
| פין 6 | PE4 (OC3B/INT4) — Port E bit 4 / Timer3 Compare B / External interrupt 4 |
| פין 7 | PE5 (OC3C/INT5) — Port E bit 5 / Timer3 Compare C / External interrupt 5 |
| פין 8 | PE6 (T3/INT6) — Port E bit 6 / Timer3 clock input / External interrupt 6 |
| פין 9 | PE7 (ICP3/INT7) — Port E bit 7 / Timer3 input capture / External interrupt 7 |
| פין 10 | VCC — Digital supply voltage |
| פין 11 | GND — Ground |
| פין 12 | PA0 (AD0) — Port A bit 0 / External memory address/data bit 0 |
| פין 13 | PA1 (AD1) — Port A bit 1 / External memory address/data bit 1 |
| פין 14 | PA2 (AD2) — Port A bit 2 / External memory address/data bit 2 |
| פין 15 | PA3 (AD3) — Port A bit 3 / External memory address/data bit 3 |
| פין 16 | PA4 (AD4) — Port A bit 4 / External memory address/data bit 4 |
| פין 17 | PA5 (AD5) — Port A bit 5 / External memory address/data bit 5 |
| פין 18 | PA6 (AD6) — Port A bit 6 / External memory address/data bit 6 |
| פין 19 | PA7 (AD7) — Port A bit 7 / External memory address/data bit 7 |
| פין 20 | RESET — Reset input, active low |
| פין 21 | VCC — Digital supply voltage |
| פין 22 | GND — Ground |
| פין 23 | XTAL2 — Crystal oscillator output |
| פין 24 | XTAL1 — Crystal oscillator input / external clock input |
| פין 25 | PD0 (SCL/INT0) — Port D bit 0 / TWI clock / External interrupt 0 |
| פין 26 | PD1 (SDA/INT1) — Port D bit 1 / TWI data / External interrupt 1 |
| פין 27 | PD2 (RXD1/INT2) — Port D bit 2 / USART1 RXD / External interrupt 2 |
| פין 28 | PD3 (TXD1/INT3) — Port D bit 3 / USART1 TXD / External interrupt 3 |
| פין 29 | PD4 (ICP1) — Port D bit 4 / Timer1 input capture |
| פין 30 | VCC — Digital supply voltage |
| פין 31 | GND — Ground |
| פין 32 | GND — Ground |
| פין 33 | PC0 (A8) — Port C bit 0 / External memory address bit 8 |
| פין 34 | PC1 (A9) — Port C bit 1 / External memory address bit 9 |
| פין 35 | PC2 (A10) — Port C bit 2 / External memory address bit 10 |
| פין 36 | PC3 (A11) — Port C bit 3 / External memory address bit 11 |
| פין 37 | PC4 (A12) — Port C bit 4 / External memory address bit 12 |
| פין 38 | PC5 (A13) — Port C bit 5 / External memory address bit 13 |
| פין 39 | PC6 (A14) — Port C bit 6 / External memory address bit 14 |
| פין 40 | PC7 (A15) — Port C bit 7 / External memory address bit 15 |
| פין 41 | PG0 (WR) — Port G bit 0 / External memory write strobe |
| פין 42 | PG1 (RD) — Port G bit 1 / External memory read strobe |
| פין 43 | PG2 (ALE) — Port G bit 2 / Address latch enable |
| פין 44 | PB0 (SS) — Port B bit 0 / SPI slave select |
| פין 45 | PB1 (SCK) — Port B bit 1 / SPI serial clock |
| פין 46 | PB2 (MOSI) — Port B bit 2 / SPI master out slave in |
| פין 47 | PB3 (MISO) — Port B bit 3 / SPI master in slave out |
| פין 48 | PB4 (OC0) — Port B bit 4 / Timer0 compare output |
| פין 49 | PB5 (OC1A) — Port B bit 5 / Timer1 compare A output |
| פין 50 | PB6 (OC1B) — Port B bit 6 / Timer1 compare B output |
| פין 51 | PB7 (OC2/OC1C) — Port B bit 7 / Timer2 compare or Timer1 compare C |
| פין 52 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| פין 53 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| פין 54 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| פין 55 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| פין 56 | PF4 (ADC4/TCK) — Port F bit 4 / ADC channel 4 / JTAG TCK |
| פין 57 | PF5 (ADC5/TMS) — Port F bit 5 / ADC channel 5 / JTAG TMS |
| פין 58 | PF6 (ADC6/TDO) — Port F bit 6 / ADC channel 6 / JTAG TDO |
| פין 59 | PF7 (ADC7/TDI) — Port F bit 7 / ADC channel 7 / JTAG TDI |
| פין 60 | AREF — ADC reference voltage |
| פין 61 | VCC — Digital supply voltage |
| פין 62 | GND — Ground |
| פין 63 | AVCC — Analog supply voltage for ADC |
| פין 64 | GND — Ground |
יישומים טיפוסיים
ATMEGA128L-8AN מתאים עבור 6 יישוםs: Industrial Automation and Process Control, Battery-Powered IoT Edge Nodes, Embedded Human-Machine Interface (HMI), Sensor Data Acquisition Systems, Motor Control and PWM Drivers, Legacy 5V Embedded Systems Upgrade.
Industrial Automation and Process Control
The ATMEGA128L-8AN's 53 GPIO lines, four Timer/Counters with PWM, and dual USARTs make it a strong fit for industrial PLC and process-control modules where deterministic real-time response is required. The 8-channel 10-bit ADC handles analog sensor inputs (temperature, pressure, flow) directly, while the 128 KB Flash and 4 KB EEPROM provide ample headroom for Modbus RTU, CAN, or proprietary fieldbus protocol stacks. Wide 2.7 V to 5.5 V supply tolerance simplifies integration with both 24 V-derived 5 V rails and 3.3 V logic systems common in factory-automation backplanes.
מומלץ
Battery-Powered IoT Edge Nodes
The ATMEGA128L-8AN's low-voltage 'L' silicon, six software-selectable sleep modes, and microampere-range power-down current suit battery-powered wireless sensor nodes. The 4 KB EEPROM enables non-volatile configuration storage without external memory ICs, and the integrated TWI (I2C) and SPI interfaces connect directly to sensors and sub-GHz radio modules such as the Microchip MRF89XA. JTAG-based on-chip debug accelerates firmware iteration during IoT product development, while the 64-pin TQFP package supports compact PCB layouts.
מומלץ
Embedded Human-Machine Interface (HMI)
With 128 KB Flash, 4 KB SRAM, and an integrated ADC, the ATMEGA128L-8AN drives mid-complexity HMI panels including character LCDs, keypad matrices, and LED status indicators. The dual USARTs split communication between a host controller and an RS-485 fieldbus, while the four PWM channels drive backlight dimming, buzzer tones, and indicator brightness. Industrial temperature rating (-40 C to +85 C) and JTAG-based field firmware updates via bootloader make it suitable for ruggedized operator-interface panels.
מומלץ
Sensor Data Acquisition Systems
The ATMEGA128L-8AN integrates an 8-channel 10-bit ADC, JTAG interface, and 53 GPIOs - ideal for multi-channel sensor data loggers in laboratory and field instrumentation. The 4 KB EEPROM provides non-volatile storage for calibration coefficients, while the 128 KB Flash hosts DSP-style filtering routines running at 1 MIPS per MHz. Combined with the SPI bus for high-speed external ADC or FRAM expansion, the device captures slow analog processes such as strain gauge bridges, thermocouples, and 4-20 mA loops with deterministic timing.
מומלץ
Motor Control and PWM Drivers
The four flexible Timer/Counters with PWM modes make the ATMEGA128L-8AN a cost-effective platform for brushed DC and stepper motor control in small appliances, robotics, and CNC accessory axes. The 8 MHz clock drives up to four PWM channels with selectable phase-correct or fast-PWM modes, while the dual USARTs handle command input from a host controller. The 64-pin TQFP package dissipates modest heat at moderate PWM duty cycles, and the 5.5 V absolute maximum tolerates 5 V gate-driver rails for small H-bridges.
מומלץ
Legacy 5V Embedded Systems Upgrade
The ATMEGA128L-8AN's 5.5 V absolute maximum and JTAG-based field upgrade path make it a natural choice for extending the lifecycle of legacy 5 V embedded controllers that must add connectivity or richer peripherals. With 128 KB Flash, designers can integrate Bluetooth/Wi-Fi co-processor command stacks, USB-to-UART bridges, or new sensor drivers without external memory. The ATmega128 is 100% pin-compatible with the older ATmega103, simplifying migration of legacy PCBs into modernized firmware architectures.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ATMEGA128L-8AN — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ATMEGA128L-8AU | ATMEGA128L-8AN | ATMEGA128L-8MN | ATMEGA128-16AN | ATMEGA128-16AI |
|---|---|---|---|---|---|---|
| Package | 64-pin TQFP (14x14 mm) | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz | 16 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Packaging Format | Tape & Reel | Tray | Tray | Tray | Tray | Tray |
| Lifecycle Status | NRND (estimated EOL 2024) | NRND | NRND | Active | NRND | NRND |
מבדילים עיקריים
- Pin-and-silicon identical tray counterpart (לעומתATMEGA128L-8AU)
- Same-package higher-speed upgrade path (לעומתATMEGA128-16AN)
- Wide 2.7 V to 5.5 V supply tolerance vs 5V-only parts (לעומתATMEGA128-16AN)
הערות תכנון
Decouple the ATMEGA128L-8AN supply rails with a 100 nF ceramic capacitor placed within 5 mm of each VCC pin (pins 10, 21, 30, 61) plus a 10 uF bulk capacitor on the AVCC pin (63). The 'L' variant operates down to 2.7 V but the maximum clock at that voltage is 8 MHz; operating above the rated frequency versus VCC curve will result in unstable Flash reads. Estimated: a 3.3 V system running at 8 MHz with 53 GPIOs switching at 1 MHz can source up to 200 mA peak supply transients.
Route the JTAG signals (TMS, TCK, TDI, TDO on PF4-PF7) away from switching signal traces to avoid debug interference, and place 4.7 kohm pull-up resistors on the TCK and TMS lines if the JTAG connector is removable. Keep the XTAL1/XTAL2 traces short and symmetric; crystal load capacitors (typically 12-22 pF) must match the crystal's rated load capacitance (CL) computed as CL = (C1 * C2) / (C1 + C2) + Cstray where Cstray is approximately 5 pF.
Do not program the JTAGEN fuse (OCDEN/JTAGEN bits) without first ensuring your programmer supports JTAG; disabling JTAG without an alternative ISP path will brick the device unless a high-voltage parallel programmer is available. The AREF pin must not exceed AVCC by more than 0.3 V or fall below 1.0 V without proper bypassing to avoid damage to the ADC. Finally, the external memory interface pins (PORTA, PORTC, PG0-PG2) must be disabled via the XMCR register when unused, or they will consume additional power and conflict with general-purpose I/O.
The TQFP-64 package has a typical theta_JA of approximately 50 C/W when mounted on a 4-layer JEDEC test board, which is adequate for typical MCU workloads (less than 100 mW). Estimated: in a sealed enclosure without airflow, derate maximum ambient by approximately 5 C per watt of dissipation above 0.5 W to keep the junction below 125 C. For industrial applications pushing high GPIO current loads, use ground-plane-connected thermal vias under the exposed die pad and minimize adjacent high-power traces.
מידע על תאימות
RoHS-compliant Green Pb-free package per Microchip environmental compliance data. AEC-Q100 not applicable - this is a general-purpose industrial-grade MCU. Conflict-mineral statement available from Microchip's corporate compliance page.
