ATMEGA6490A-AUR - 8-bit AVR MCU, 64KB Flash, LCD | Microchip
料号： ATMEGA6490A-AUR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.86 | $9.86 |
| 10 | $8.93 | $89.30 |
| 25 | $8.55 | $213.75 |
| 100 | $7.8 | $780.00 |
| 1,000 | $6.55 | $6,550.00 |
ATMEGA6490A-AUR 概述
An 8-bit AVR ATmega microcontroller is a single-chip computer that executes a reduced instruction set (RISC) entirely from embedded Flash. Within the power-management hierarchy, an MCU sits at the system-control layer above discrete logic and below application processors: it combines CPU, memory, timers, communication peripherals, and in this family, a segment LCD driver on one die. The AVR architecture connects 32 general-purpose working registers directly to the arithmetic logic unit (ALU), so two independent registers can be accessed in a single instruction executed in one clock cycle, achieving throughputs up to ten times faster than conventional CISC microcontrollers.
Key features of the ATmega6490A include 54/69 general purpose I/O lines, a JTAG interface supporting boundary-scan, on-chip debugging and programming, a complete on-chip LCD controller with internal contrast control, and three flexible timers with compare modes and PWM. The 64KB Flash supports read-while-write self-programming, enabling in-system firmware updates without an external programmer.
Technically, the AVR core executes 130 powerful instructions, most in a single clock cycle. The self-programming Flash enables bootloader implementations, while the LCD controller drives multi-segment displays directly, eliminating an external LCD driver and reducing BOM cost and board area in battery-powered instruments.
Typical applications include utility metering with segmented LCD displays, handheld measurement instruments, industrial control panels, and battery-powered consumer devices where the low-power AVR core and integrated LCD drive are decisive.
For design, budget the peripheral set early: with 69 I/O lines and an LCD panel, pin multiplexing between LCD segment lines and general-purpose I/O must be mapped before PCB layout, as segment pins overlap parallel ports.
This page synthesizes distributor pricing, same-family drop-in alternatives, pinout guidance, and practical design notes not found together on the manufacturer datasheet. Pricing shown as of 2026-09-18.
直接替换替代料： ATMEGA6490A-AUR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA6490A-AUR （相同外形与封装尺寸） ——差异在于 RoHS Status, EEPROM, Operating Temperature, SRAM, Flash Memory.
快速对比工具——选择替代料号进行并排对比：
ATMEGA6490P-AUR
✅ 直接替换✓ 有现货
$5.95 / 个
查看数据手册 →ATMEGA3290P-20AUR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →ATMEGA3290PA-AUR
✅ 直接替换✓ 有现货
$2.95 / 个
查看数据手册 →ATMEGA3290V-8AUR
✅ 直接替换✓ 有现货
$2.3 / 个
查看数据手册 →ATMEGA6450P-AU
✅ 直接替换✓ 有现货
$5.9 / 个
查看数据手册 →ATMEGA6490A-AUR 最大额定值与电气特性
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| 最大时钟频率 | 20 MHz |
| Flash Memory | 64 KB (32K x 16) ISP, read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Instructions | 130, most single-cycle |
| General Purpose Working Registers | 32 |
| General Purpose I/O Lines | 54 / 69 |
| LCD Controller | On-chip, with internal contrast control |
| Timers/Counters | 3 flexible timers |
| Debug/Programming Interface | JTAG (boundary-scan, on-chip debug and programming) |
| 工作温度 | -40C to +85C (Industrial) |
| 封装 | 100-TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| Series | AVR ATmega |
ATMEGA6490A-AUR 引脚配置
| 引脚 1 | SEG7 — LCD segment line 7 / GPIO |
| 引脚 2 | SEG6 — LCD segment line 6 / GPIO |
| 引脚 3 | SEG5 — LCD segment line 5 / GPIO |
| 引脚 4 | SEG4 — LCD segment line 4 / GPIO |
| 引脚 5 | SEG3 — LCD segment line 3 / GPIO |
| 引脚 6 | SEG2 — LCD segment line 2 / GPIO |
| 引脚 7 | SEG1 — LCD segment line 1 / GPIO |
| 引脚 8 | SEG0 — LCD segment line 0 / GPIO |
| 引脚 9 | COM0 — LCD common line 0 |
| 引脚 10 | COM1 — LCD common line 1 |
| 引脚 11 | COM2 — LCD common line 2 |
| 引脚 12 | COM3 — LCD common line 3 |
| 引脚 13 | SEG8 — LCD segment line 8 / GPIO |
| 引脚 14 | SEG9 — LCD segment line 9 / GPIO |
| 引脚 15 | SEG10 — LCD segment line 10 / GPIO |
| 引脚 16 | SEG11 — LCD segment line 11 / GPIO |
| 引脚 17 | SEG12 — LCD segment line 12 / GPIO |
| 引脚 18 | SEG13 — LCD segment line 13 / GPIO |
| 引脚 19 | SEG14 — LCD segment line 14 / GPIO |
| 引脚 20 | SEG15 — LCD segment line 15 / GPIO |
| 引脚 21 | AVCC — Analog supply voltage |
| 引脚 22 | GND — Ground |
| 引脚 23 | AREF — Analog reference for ADC |
| 引脚 24 | PB0 (SS) — Port B bit 0 / SPI slave select |
| 引脚 25 | PB1 — Port B bit 1 |
| 引脚 26 | PB2 — Port B bit 2 |
| 引脚 27 | PB3 (MOSI) — Port B bit 3 / SPI master output |
| 引脚 28 | PB4 (MISO) — Port B bit 4 / SPI master input |
| 引脚 29 | PB5 (SCK) — Port B bit 5 / SPI clock |
| 引脚 30 | PB6 — Port B bit 6 |
| 引脚 31 | PB7 (OC2A) — Port B bit 7 / Timer2 output compare A |
| 引脚 32 | PE0 — Port E bit 0 |
| 引脚 33 | PE1 — Port E bit 1 |
| 引脚 34 | PE2 — Port E bit 2 |
| 引脚 35 | PE3 — Port E bit 3 |
| 引脚 36 | PE4 — Port E bit 4 |
| 引脚 37 | PE5 — Port E bit 5 |
| 引脚 38 | PE6 — Port E bit 6 |
| 引脚 39 | PE7 (ICP3) — Port E bit 7 / Timer3 input capture |
| 引脚 40 | VCC — Digital supply voltage |
| 引脚 41 | GND — Ground |
| 引脚 42 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| 引脚 43 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| 引脚 44 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| 引脚 45 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| 引脚 46 | PF4 (TCK) — Port F bit 4 / JTAG test clock |
| 引脚 47 | PF5 (TMS) — Port F bit 5 / JTAG test mode select |
| 引脚 48 | PF6 (TDO) — Port F bit 6 / JTAG test data out |
| 引脚 49 | PF7 (TDI) — Port F bit 7 / JTAG test data in |
| 引脚 50 | PG0 — Port G bit 0 |
| 引脚 51 | PG1 — Port G bit 1 |
| 引脚 52 | PG2 — Port G bit 2 |
| 引脚 53 | PG3 (TOSC2) — Port G bit 3 / Timer oscillator output |
| 引脚 54 | PG4 (TOSC1) — Port G bit 4 / Timer oscillator input |
| 引脚 55 | RESET — Active-low reset input |
| 引脚 56 | VCC — Digital supply voltage |
| 引脚 57 | GND — Ground |
| 引脚 58 | XTAL2 — Main crystal oscillator output |
| 引脚 59 | XTAL1 — Main crystal oscillator input / external clock |
| 引脚 60 | PD0 — Port D bit 0 |
| 引脚 61 | PD1 — Port D bit 1 |
| 引脚 62 | PD2 — Port D bit 2 |
| 引脚 63 | PD3 — Port D bit 3 |
| 引脚 64 | PD4 — Port D bit 4 |
| 引脚 65 | PD5 — Port D bit 5 |
| 引脚 66 | PD6 — Port D bit 6 |
| 引脚 67 | PD7 — Port D bit 7 |
| 引脚 68 | PG5 — Port G bit 5 |
| 引脚 69 | SEG32 — LCD segment line 32 / GPIO |
| 引脚 70 | SEG33 — LCD segment line 33 / GPIO |
| 引脚 71 | SEG34 — LCD segment line 34 / GPIO |
| 引脚 72 | SEG35 — LCD segment line 35 / GPIO |
| 引脚 73 | SEG36 — LCD segment line 36 / GPIO |
| 引脚 74 | SEG37 — LCD segment line 37 / GPIO |
| 引脚 75 | SEG38 — LCD segment line 38 / GPIO |
| 引脚 76 | SEG39 — LCD segment line 39 / GPIO |
| 引脚 77 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| 引脚 78 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| 引脚 79 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| 引脚 80 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| 引脚 81 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| 引脚 82 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| 引脚 83 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| 引脚 84 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
| 引脚 85 | PC0 — Port C bit 0 |
| 引脚 86 | PC1 — Port C bit 1 |
| 引脚 87 | PC2 — Port C bit 2 |
| 引脚 88 | PC3 — Port C bit 3 |
| 引脚 89 | PC4 — Port C bit 4 |
| 引脚 90 | PC5 — Port C bit 5 |
| 引脚 91 | PC6 — Port C bit 6 |
| 引脚 92 | PC7 — Port C bit 7 |
| 引脚 93 | PJ0 (RXD0) — Port J bit 0 / USART0 receive |
| 引脚 94 | PJ1 (TXD0) — Port J bit 1 / USART0 transmit |
| 引脚 95 | PJ2 — Port J bit 2 |
| 引脚 96 | PJ3 — Port J bit 3 |
| 引脚 97 | PJ4 — Port J bit 4 |
| 引脚 98 | PJ5 — Port J bit 5 |
| 引脚 99 | PJ6 — Port J bit 6 |
| 引脚 100 | PJ7 — Port J bit 7 |
典型应用
ATMEGA6490A-AUR 适用于 6 应用s: Utility Metering (Electricity/Water/Gas), Handheld Measurement Instruments, Industrial Control Panels with LCD Display, Battery-Powered Consumer Devices, Building Automation and HVAC Controllers, Point-of-Sale and Vending Equipment.
Utility Metering (Electricity/Water/Gas)
The ATMEGA6490A-AUR fits utility metering because its on-chip LCD controller drives the multi-segment consumption display directly with internal contrast control, while 64KB self-programming Flash holds tariff tables, communication stacks, and anti-tamper firmware with room for in-field updates via read-while-write bootloaders. In a typical meter, the MCU reads pulse or sensor inputs through its GPIO, accumulates consumption, and refreshes the LCD segment map from RAM. The three flexible timers generate measurement time bases, and 2KB EEPROM stores calibration constants across power cycles. Unlike designs using an external LCD driver IC, the integrated controller cuts BOM count and board area; the trade-off is sharing segment pins with the limited 69 GPIO, so pin budgeting must be done before layout.
推荐
Handheld Measurement Instruments
Battery-powered handheld instruments benefit from the ATmega6490A combination of a low-power 8-bit AVR core, integrated LCD drive, and generous 4KB SRAM for buffering measurement samples and UI state. The JTAG interface supports on-chip debugging during development and boundary-scan in production test fixtures, shortening time-to-market. Firmware for auto-ranging, averaging, and menu-driven user interfaces typically fits well within the 64KB Flash, leaving headroom for calibration routines stored in the 2KB EEPROM. The 20MHz core executes most of its 130 instructions in a single cycle, keeping ADC post-processing responsive. Because sleep-current dominates battery life in this product class, the picoPower ATMEGA6490P-AUR pin-compatible variant is worth specifying for new designs at the same footprint.
推荐
Industrial Control Panels with LCD Display
In industrial control panels, the ATMEGA6490A-AUR serves as the human-machine interface and sequence controller: its 54/69 GPIO lines read switches and drive relays or indicators, while the LCD controller renders status and setpoint information without an external driver. The industrial -40C to +85C temperature rating suits unconditioned cabinets, and the three flexible timers generate PWM outputs for actuators or time-stamped control sequences. The 20MHz single-cycle AVR core executes PID-style loops deterministically, and JTAG boundary-scan simplifies in-cabinet production test of the dense TQFP-100 interconnect. Design consideration: implement watchdog supervision and brown-out handling, since panel power quality is often poor; the read-while-write Flash allows logged events to be retained across resets via EEPROM.
推荐
Battery-Powered Consumer Devices
Consumer products such as kitchen scales, thermostats, and remote controls exploit the ATmega6490A's single-chip integration: LCD controller, 20MHz AVR core, 64KB Flash, and 69 GPIO in one 100-TQFP reduce component count, which lowers cost and improves reliability. The 32 general-purpose working registers connected directly to the ALU make interrupt-driven key-scan and display-refresh code compact and fast, and the self-programming Flash supports feature upgrades after sale. Memory segmentation matters here: parameters and user settings live in the 2KB EEPROM, buffers in the 4KB SRAM, and the application plus any bootloader in the 64KB Flash. For maximum battery life, pair with the pin-compatible picoPower ATMEGA6490P-AUR and exploit its enhanced sleep modes in the standby state between user interactions.
推荐
Building Automation and HVAC Controllers
Zone controllers and thermostats in building automation use the ATMEGA6490A-AUR for its LCD user interface, robust 8-bit control core, and ample I/O for damper, valve, and sensor connections. The three timers produce PWM drive for actuators and time bases for scheduling, while the 64KB Flash accommodates communication protocol firmware and schedules, and EEPROM retains configuration through power outages. The industrial temperature rating covers mechanical rooms and rooftop enclosures. Development productivity is high thanks to JTAG on-chip debugging and the mature AVR toolchain; boundary-scan through the same JTAG port validates the 100-pin assembly during board production. The key design consideration is LCD segment-to-GPIO multiplexing: assign the display map first, then allocate remaining port pins to sensor and actuator functions.
推荐
Point-of-Sale and Vending Equipment
Vending machines and price displays require a durable segmented display and reliable event logging, both addressed natively by the ATmega6490A: the LCD controller with contrast control keeps the customer display legible over temperature, while 64KB self-programming Flash supports firmware field updates during service visits without swapping sockets. The 69 GPIO handle coin acceptors, motor drivers, and door sensors, and the timers generate motor PWM and vend-cycle timing. 2KB EEPROM logs transaction counters and fault codes across power interruptions. The 20MHz single-cycle RISC core handles coin-validation state machines with deterministic latency. JTAG boundary-scan eases production test of the large TQFP-100 board, and read-while-write programming lets a bootloader update application code while preserving logged data.
推荐
推荐产品汇总
工程参考数据： ATMEGA6490A-AUR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA6490P-AUR | ATMEGA3290P-20AUR | ATMEGA3290V-8AUR | ATMEGA6450P-AU |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-TQFP (14x14) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP - same footprint |
| Flash Memory | 64 KB | 64 KB | 32 KB | 32 KB | 64 KB |
| EEPROM | 2 KB | 2 KB | 1 KB | 1 KB | 2 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 8 MHz | 16 MHz |
| LCD Controller | Yes, with contrast control | Yes | Yes | Yes | No |
| PicoPower Technology | No (A variant) | Yes | Yes | No | Yes |
| JTAG Interface | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Double the Flash of the 3290 LCD family （对比 ATMEGA3290P-20AUR)
- Integrated LCD controller with contrast control （对比 ATMEGA6450P-AU)
- PicoPower upgrade path without redesign （对比 ATMEGA6490P-AUR)
- Higher performance than the V speed grade （对比 ATMEGA3290V-8AUR)
设计说明
Map LCD segment-to-GPIO multiplexing before layout. On the ATmega6490A, the SEG0-SEG39 lines overlap general-purpose port pins, so a design using a large LCD panel loses up to 40 GPIO from the 69-line total. Draw the display map and pin budget first, then allocate remaining port pins to SPI, USART, and discrete I/O. Place the 100-TQFP footprint with 0.5mm pitch rules and leave JTAG (PF4-PF7) routed to a header during development even if production fuses disable it.
Decouple every VCC pin and the AVCC pin separately: use 100nF ceramics at pins 40, 56, and 21, each with a low-impedance path to the ground plane, plus a 10uF bulk capacitor near the part. Tie AREF (pin 23) to ground through 100nF when using the internal ADC reference, or filter an external reference. If battery life is the dominant requirement, prefer the pin-compatible ATMEGA6490P-AUR picoPower variant, which reduces sleep current in the same 100-TQFP footprint with no PCB change.
Do not assume the 20MHz rating applies at all supply voltages: AVR speed grades are voltage-dependent, so verify the clock-versus-VCC derating curve in the electrical characteristics section of the family datasheet (ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P) before fixing the power tree. Also enable the brown-out detector and watchdog in fuses for metering products, since read-while-write Flash updates interrupted by a brown-out can corrupt a page. Keep EEPROM writes wear-leveled; the 2KB EEPROM has a finite endurance rating.
合规信息
The -AUR suffix is Microchip's RoHS-compliant, lead-free Tape-and-Reel ordering code. Industrial temperature grade (-40C to +85C); not AEC-Q100 automotive qualified. REACH and halogen-free declarations should be confirmed on the Microchip product page compliance documents.
