ATMEGA128-16AN - 8-Bit AVR MCU 128KB 16MHz TQFP-64 | Microchip
MPN: ATMEGA128-16AN ✓ نشطATMEGA128-16AN نظرة عامة
An 8-bit AVR microcontroller is a single-chip processor built on the AVR enhanced RISC architecture, in which most of the 131 instructions execute in a single clock cycle. Within the system hierarchy, the microcontroller sits between simple logic ICs and application processors, integrating CPU, program memory, data memory, timers, and communication peripherals into one device for embedded control tasks.
Key features include 53 general-purpose I/O lines, 32 general-purpose working registers, four flexible timers/counters with compare modes and PWM, and an 8-channel 10-bit A/D converter. Dual USARTs, a byte-oriented Two-Wire Interface (I2C-compatible), and a hardware SPI port provide multi-protocol connectivity for sensors, displays, and industrial networks.
Technically, the fully static core sustains performance from DC to 16 MHz, while the Read-While-Write FLASH allows code updates during operation. An RTC with separate oscillator, JTAG boundary-scan, and an ATmega103 compatibility mode (via the M103C fuse) simplify legacy design migration. This version is rated at 16 MHz at 4.5-5.5V with a -40C to +85C industrial temperature rating.
Typical applications include industrial automation control panels, HVAC and building-management systems, battery-monitoring instrumentation, and motor-control nodes using the PWM channels.
Design consideration: for lowest power consumption in idle and power-down modes, configure unused I/O pins as inputs with internal pull-ups and use the power-reduction registers to clock-gate unused peripherals.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
بدائل مباشرة لـ ATMEGA128-16AN — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ATMEGA128-16AN (نفس عامل الشكل والبصمة) — يختلف في RoHS Status, Operating Temperature, Package, Flash Memory, Supply Voltage Range.
ATMEGA128-16AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA128-16AUR
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA128-16AI
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA64-16AU
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←AT90CAN128-16AU
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
ATMEGA1281-16AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATMEGA128-16AN الحدود القصوى والخصائص الكهربائية
| Core Architecture | 8-bit AVR RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 16 MHz |
| Peak Throughput | 16 MIPS at 16 MHz |
| Flash Memory | 128 KB (64K x 16) |
| SRAM | 4 KB |
| EEPROM | 4 KB |
| Operating Voltage Range | 4.5 V to 5.5 V |
| General Purpose I/O | 53 lines |
| Timers/Counters | 4 with compare modes and PWM |
| ADC | 8-channel, 10-bit |
| USART | 2 |
| Communication Interfaces | 2x USART, TWI (I2C), SPI |
| Debug / Boundary Scan | JTAG (IEEE 1149.1 interface for on-chip debugging) |
| Instructions | 131 instructions, most single-cycle |
| العلبة | 64-TQFP (14x14 mm) |
| نوع التركيب | Surface Mount |
| درجة حرارة التشغيل | -40C to +85C |
| Working Registers | 32 general purpose |
| حالة RoHS | unknown |
تكوين أطراف ATMEGA128-16AN
| دبوس 1 | PEN — Programming enable for external programming mode |
| دبوس 2 | PE0 (RXD0) — I/O / USART0 receive |
| دبوس 3 | PE1 (TXD0) — I/O / USART0 transmit |
| دبوس 4 | PE2 (XCK0/AIN0) — I/O / USART0 clock / analog comparator input |
| دبوس 5 | PE3 (OC3A/AIN1) — I/O / Timer3 output compare A / comparator input |
| دبوس 6 | PE4 (OC3B/INT4) — I/O / Timer3 output compare B / external interrupt 4 |
| دبوس 7 | PE5 (OC3C/INT5) — I/O / Timer3 output compare C / external interrupt 5 |
| دبوس 8 | PE6 (T3/INT6) — I/O / Timer3 clock input / external interrupt 6 |
| دبوس 9 | PE7 (ICP3/INT7) — I/O / Timer3 input capture / external interrupt 7 |
| دبوس 10 | GND — Ground |
| دبوس 11 | VCC — Digital supply voltage |
| دبوس 12 | PB0 (SS) — I/O / SPI slave select |
| دبوس 13 | PB1 (SCK) — I/O / SPI clock |
| دبوس 14 | PB2 (MOSI) — I/O / SPI master data out |
| دبوس 15 | PB3 (MISO) — I/O / SPI master data in |
| دبوس 16 | PB4 (OC0) — I/O / Timer0 output compare / PWM |
| دبوس 17 | PB5 (OC1A) — I/O / Timer1 output compare A / PWM |
| دبوس 18 | PB6 (OC1B) — I/O / Timer1 output compare B / PWM |
| دبوس 19 | PB7 (OC2/OC1C) — I/O / Timer2 output compare / Timer1 output compare C |
| دبوس 20 | PG3 (TOSC2) — I/O / RTC oscillator output |
| دبوس 21 | PG4 (TOSC1) — I/O / RTC oscillator input |
| دبوس 22 | RESET — Active-low reset input |
| دبوس 23 | VCC — Digital supply voltage |
| دبوس 24 | GND — Ground |
| دبوس 25 | XTAL2 — Main oscillator output |
| دبوس 26 | XTAL1 — Main oscillator input / external clock |
| دبوس 27 | PD0 (SCL/INT0) — I/O / TWI clock / external interrupt 0 |
| دبوس 28 | PD1 (SDA/INT1) — I/O / TWI data / external interrupt 1 |
| دبوس 29 | PD2 (TXD1/INT2) — I/O / USART1 transmit / external interrupt 2 |
| دبوس 30 | PD3 (RXD1/INT3) — I/O / USART1 receive / external interrupt 3 |
| دبوس 31 | PD4 (ICP1) — I/O / Timer1 input capture |
| دبوس 32 | PD5 (XCK1) — I/O / USART1 clock |
| دبوس 33 | PD6 (T1) — I/O / Timer1 external clock |
| دبوس 34 | PD7 (T0) — I/O / Timer0 external clock |
| دبوس 35 | PG0 (WR) — I/O / external memory write strobe |
| دبوس 36 | PG1 (RD) — I/O / external memory read strobe |
| دبوس 37 | PC0 (A8) — I/O / external memory address line 8 |
| دبوس 38 | PC1 (A9) — I/O / external memory address line 9 |
| دبوس 39 | PC2 (A10) — I/O / external memory address line 10 |
| دبوس 40 | PC3 (A11) — I/O / external memory address line 11 |
| دبوس 41 | PC4 (A12) — I/O / external memory address line 12 |
| دبوس 42 | PC5 (A13) — I/O / external memory address line 13 |
| دبوس 43 | PC6 (A14) — I/O / external memory address line 14 |
| دبوس 44 | PC7 (A15) — I/O / external memory address line 15 |
| دبوس 45 | GND — Ground |
| دبوس 46 | AVCC — ADC and Port A supply voltage |
| دبوس 47 | PA0 (AD0) — I/O / ADC input 0 / external memory address/data line 0 |
| دبوس 48 | PA1 (AD1) — I/O / ADC input 1 / external memory address/data line 1 |
| دبوس 49 | PA2 (AD2) — I/O / ADC input 2 / external memory address/data line 2 |
| دبوس 50 | PA3 (AD3) — I/O / ADC input 3 / external memory address/data line 3 |
| دبوس 51 | PA4 (AD4) — I/O / ADC input 4 / external memory address/data line 4 |
| دبوس 52 | PA5 (AD5) — I/O / ADC input 5 / external memory address/data line 5 |
| دبوس 53 | PA6 (AD6) — I/O / ADC input 6 / external memory address/data line 6 |
| دبوس 54 | PA7 (AD7) — I/O / ADC input 7 / external memory address/data line 7 |
| دبوس 55 | PF0 (ADC0) — I/O / ADC input 0 |
| دبوس 56 | PF1 (ADC1) — I/O / ADC input 1 |
| دبوس 57 | PF2 (ADC2) — I/O / ADC input 2 |
| دبوس 58 | PF3 (ADC3) — I/O / ADC input 3 |
| دبوس 59 | PF4 (ADC4/TCK) — I/O / ADC input 4 / JTAG test clock |
| دبوس 60 | PF5 (ADC5/TMS) — I/O / ADC input 5 / JTAG test mode select |
| دبوس 61 | PF6 (ADC6/TDO) — I/O / ADC input 6 / JTAG test data out |
| دبوس 62 | PF7 (ADC7/TDI) — I/O / ADC input 7 / JTAG test data in |
| دبوس 63 | AREF — ADC reference voltage |
| دبوس 64 | GND — Ground |
التطبيقات النموذجية
ATMEGA128-16AN مناسب لـ 6 التطبيقs: Industrial Automation Control, HVAC and Building Management Systems, Motor Control Nodes, Instrumentation and Data Loggers, Embedded Networking Gateways, ATmega103 Legacy Board Migration.
Industrial Automation Control
The ATMEGA128-16AN fits industrial automation nodes because its -40C to +85C rating, 53 GPIO lines, and 4.5-5.5V supply tolerance map directly onto 5V industrial backplanes. Four timers with compare modes and PWM drive motor or heater control, while dual USARTs implement Modbus RTU and service links in parallel. The 128 KB flash leaves headroom for protocol stacks, state machines, and HMI logic, and JTAG boundary scan supports production board test. Placing the MCU between RS-485 transceivers and optocoupled I/O gives a deterministic single-cycle-execution core with 16 MIPS throughput; unlike 3V-only successors, no level shifting is needed on legacy 5V sensor buses.
موصى به
HVAC and Building Management Systems
In HVAC controllers, the ATMEGA128-16AN's 8-channel 10-bit ADC samples temperature, humidity, and pressure sensors across multiple zones, while the RTC with a separate 32.768 kHz oscillator (TOSC1/TOSC2 on PG3/PG4) maintains schedules through power interruptions. The 4 KB EEPROM stores calibration constants and setpoints without flash wear. TWI (I2C) addresses digital sensors and display drivers, and the 128 KB flash accommodates BACnet-like protocol handling. Its 5V operation simplifies interfacing with legacy damper-actuator and relay-drive circuits. Power-down mode with watchdog wake-up reduces standby consumption in battery-backed thermostat variants, and the M103C compatibility mode eases upgrades of older ATmega103-based controller boards.
موصى به
Motor Control Nodes
The ATMEGA128-16AN suits motor-control supervision with four flexible timers providing complementary PWM and compare channels; PB5-PB7 deliver OC1A/OC1B/OC1C outputs suitable for driving H-bridge gate-driver logic at 16 MHz timer resolution. The 10-bit ADC reads back shunt currents and bus voltage with up to 8 channels, enabling closed-loop speed regulation in firmware. Dual USARTs separate fieldbus commands from diagnostic telemetry. The 16 MIPS RISC core executes PI control loops deterministically without pipeline jitter. Designers should pair the PWM outputs with opto-isolated gate drivers and use the JTAG interface for in-target tuning of control parameters during commissioning.
موصى به
Instrumentation and Data Loggers
For battery-monitoring and field instrumentation, the ATMEGA128-16AN combines an 8-channel 10-bit ADC with 4 KB SRAM buffering and a 4 KB EEPROM for nonvolatile logging, making standalone acquisition nodes feasible without external memory. SPI and TWI interfaces extend capacity with serial FLASH or FRAM when needed, and the 128 KB flash hosts floating-point conversion and calibration code with room to spare. Read-While-Write flash supports field firmware updates over the diagnostic USART. Its fully static core permits clocking down for precision, low-noise measurements, then returning to 16 MHz for communication bursts, balancing accuracy and responsiveness in portable instruments.
موصى به
Embedded Networking Gateways
The ATMEGA128-16AN works as a protocol-conversion gateway between serial field devices and Ethernet or CAN backbones. Two independent hardware USARTs (PE0/PE1 and PD2/PD3 with XCK1 on PD5) sustain simultaneous links, while the byte-oriented Two-Wire Interface and hardware SPI connect auxiliary controllers. The 128 KB flash accommodates dual protocol stacks plus buffering logic, and the RAMPZ-capable memory model is supported transparently by C compilers such as CodeVisionAVR. Because the device is 100% pin compatible with ATmega103, gateway vendors can refresh legacy ATmega103 hardware without PCB redesign. JTAG on-chip debugging accelerates stack integration and fault tracing during development.
موصى به
ATmega103 Legacy Board Migration
The manufacturer datasheet states the ATmega128 is 100% pin compatible with ATmega103 and can replace it on current printed circuit boards, making the ATMEGA128-16AN the canonical modernization path for obsolete ATmega103 designs. Program the M103C fuse to emulate ATmega103 RAM, I/O pin, and interrupt-vector behavior, or run in native mode to unlock 53 I/O lines, TWI, and more timers while reusing the identical TQFP-64 footprint. Microchip's application note "Replacing ATmega103 by ATmega128" lists the memory-map and fuse considerations. The 16 MHz speed grade doubles the legacy part's throughput on the same 5V board, typically eliminating timing-margin issues in refreshed production runs.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ATMEGA128-16AN — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ATMEGA128-16AU | ATMEGA128-16AI | ATMEGA64-16AU | AT90CAN128-16AU | ATMEGA1281-16AU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Flash Memory | 128 KB | 128 KB | 128 KB | 64 KB | 128 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 4 KB | 8 KB |
| Max Clock / Throughput | 16 MHz / 16 MIPS | 16 MHz / 16 MIPS | 16 MHz / 16 MIPS | 16 MHz / 16 MIPS | 16 MHz / 16 MIPS | 16 MHz / 16 MIPS |
| Supply Voltage | 4.5 V - 5.5 V | 4.5 V - 5.5 V | 4.5 V - 5.5 V | 4.5 V - 5.5 V | 4.5 V - 5.5 V | 2.7 V - 5.5 V (16 MHz needs 4.5 V) |
| Special Peripherals | TWI, SPI, 2 USART, 10-bit ADC, JTAG | Same as this product | Same as this product | TWI, SPI, USART, 10-bit ADC, JTAG | Adds CAN 2.0B controller | Updated peripheral set, mega1280-family pinout |
| Pin Compatibility with ATmega128 | Reference | 100% (same die) | 100% (same die) | Largely compatible pin family | Pin-compatible footprint, peripheral allocation differs | Not pin-identical (different family pinout) |
| Key Differentiation | Classic ATmega128, 5V industrial grade | Alternate packaging/compliance suffix | Industrial temperature suffix option | Cost-down with half the memory | Native CAN bus for vehicle/industrial networks | Successor family for new designs |
أبرز الفروقات
- ATmega103 legacy migration without PCB change (مقابلATMEGA1281-16AU)
- Full 16 MHz speed at 5V industrial temperature (مقابلATMEGA64-16AU)
- Deterministic single-cycle RISC with JTAG (مقابلAT90CAN128-16AU)
ملاحظات التصميم
The ATMEGA128-16AN in TQFP-64 requires a decoupling capacitor (100 nF ceramic) at each VCC/AVCC pin pair (pins 11/23 VCC, 46 AVCC) placed within 5 mm of the pin, with a solid ground return to pins 10, 24, 45, and 64. Route the 16 MHz crystal close to XTAL1/XTAL2 (pins 26/25) with short, symmetrical traces and keep the RTC crystal on PG3/PG4 isolated from switching traces. Use AVCC with an LC filter (10 uH + 100 nF) when ADC accuracy matters, and tie AREF to a clean reference through the recommended capacitor network.
Three classic ATmega128 pitfalls: (1) PF4-PF7 default to JTAG function after reset - if you need them as ADC inputs or GPIO, clear the JTAGEN fuse or set the JTD bit in software twice in succession; (2) the M103C fuse ships in ATmega103 compatibility mode on some programming tools, silently masking extra SRAM, I/O, and interrupt vectors - disable it for native operation unless migrating ATmega103 boards; (3) pin 1 is PEN (programming enable), not a general-purpose pin - do not drive it high unintentionally during reset or the device may enter programming mode.
Estimated: at 16 MHz and 5V, the ATmega128 active supply current is typically on the order of 20-25 mA per manufacturer datasheet curves (verify against the current datasheet revision for your lot), so design the 5V rail with at least 50 mA margin for the MCU plus I/O loads. Use power-reduction registers (PRR) to clock-gate unused peripherals such as Timer2 and ADC in idle periods, and select power-down mode (microamp-class current) for battery-backed standby. Brown-out detection should be enabled at approximately 4.0-4.2V via the BODLEVEL fuses to prevent EEPROM corruption during 5V rail droop.
When using the external-memory interface (PG0/PG1 WR/RD strobes with PA0-PA7 multiplexed address/data), keep bus traces under 10 cm and add series termination (22-33 ohm) on the strobe lines to limit ringing at 16 MHz. SPI lines on PB0-PB3 to off-board peripherals should use short traces with a ground return; if driving long cables, buffer SCK and MOSI. For the dual USARTs running at 115200 baud, verify the baud-rate generator error from the datasheet UBRR tables at 16 MHz - 115200 baud gives a small but acceptable error, while nonstandard rates may require clock adjustment.
معلومات الامتثال
RoHS/REACH/lead-free status not stated in the captured distributor data; verify on the official Microchip product page or the distributor material declaration before procurement.