ATMEGA169A-AU - 8-bit AVR MCU 16MHz 16KB Flash TQFP-64 | Microchip
MPN： ATMEGA169A-AU ✓ 啟用中ATMEGA169A-AU 概覽
An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle, sitting within the broader hierarchy of microcontrollers -> embedded processors -> semiconductors. MCUs of this class integrate program Flash, data SRAM, EEPROM, timers, serial peripherals, and analog converters on one die, eliminating external components in cost-sensitive embedded control designs.
Key features include 133 powerful instructions with mostly single-cycle execution, 16KB of self-programmable Flash with read-while-write support, and 54 general-purpose I/O lines on this package variant. A built-in 10-bit ADC with 8 channels handles analog sensing, while USART, SPI, and TWI (I2C) interfaces cover common communication needs. The on-chip LCD driver with up to 25 segment outputs x 4 commons is the distinguishing peripheral of the ATmega169 family.
The advanced RISC core provides 32 general-purpose working registers, hardware multiply, and four flexible timers (two 8-bit, one 16-bit, plus a watchdog). JTAG boundary-scan and on-chip debug simplify production programming and test. The AVR architecture achieves deterministic interrupt latency, valuable in real-time control loops.
Typical applications include appliance control panels with LCD displays, battery-powered meters and thermostats, and industrial human-machine interfaces where the integrated segment LCD controller eliminates a dedicated display driver IC.
Design consideration: at 5V the device can clock to 16 MHz, but at 3.3V the safe maximum frequency is lower, so verify the frequency-versus-voltage curve in the datasheet before system clock selection.
This page synthesizes distributor availability data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing is as of 2026-09-16.
直接替換替代品，適用於 ATMEGA169A-AU — 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： ATMEGA169A-AU （相同外形與佔位） — 差異在於 Flash Memory, Timers, Package, Working Registers, EEPROM.
ATMEGA169PA-AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA169P-16AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATMEGA329A-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATMEGA329P-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA649A-AU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ATMEGA169A-AU 最大額定值與電氣特性
| Core | AVR 8-bit RISC |
| CPU Speed | 16 MHz (16 MIPS peak) |
| Flash Memory | 16 KB (8K x 16) ISP with read-while-write |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O | 54 (TQFP-64 variant) |
| Instruction Set | 133 instructions, most single-cycle |
| Working Registers | 32 x 8-bit general purpose |
| Timers | Two 8-bit, one 16-bit, watchdog timer |
| ADC | 10-bit, 8 channels |
| LCD Controller | Segment LCD driver (up to 25 segments x 4 commons) |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Debug / Boundary Scan | JTAG (IEEE 1149.1), on-chip debug |
| 封裝 | 64-TQFP, 14 x 14 mm, 1 mm height |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (industrial) |
| 生命週期狀態 | Active |
ATMEGA169A-AU 64-tqfp, 14 x 14 mm, 1 mm height 腳位配置指南
ATMEGA169A-AU（64-tqfp, 14 x 14 mm, 1 mm height 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： ATMEGA169A-AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATMEGA169A-AU 適用於 6 應用s: Appliance Control Panels with LCD, Battery-Powered Meters and Thermostats, Industrial Human-Machine Interfaces, Sensor Acquisition Nodes, Legacy AVR Design Maintenance, Educational and Prototyping Platforms.
Appliance Control Panels with LCD
The ATMEGA169A-AU fits appliance user interfaces because its integrated segment LCD controller drives up to 25 segments x 4 commons directly, removing the cost of a dedicated LCD driver IC. The 2.7V to 5.5V supply range tolerates unregulated mains-derived supplies, and the 16 MHz AVR core executes UI scanning and control loops with deterministic single-cycle instruction timing. With 54 GPIO lines on the 64-TQFP variant, buttons, relays, and indicators connect without port expanders. The 512B EEPROM stores calibration and user settings through power cycles. Firmware should use idle mode between key scans to cut average current, and the hardware SPI/TWI can link to external sensors or an EEPROM for larger datasets.
推薦
Battery-Powered Meters and Thermostats
For battery metering products, the ATMEGA169A-AU's AVR power-management modes (idle, power-down, power-save) allow the MCU to sleep between measurement cycles, and the 2.7V floor supports direct operation from 3V lithium cells. The 10-bit 8-channel ADC digitizes sensor inputs such as thermistors and voltage dividers without an external converter, while the built-in LCD controller renders readings at minimal pin cost. The 16-bit timer supports precise wake-up intervals in power-save mode. Designers targeting multi-year battery life should compare against the pin-compatible picoPower ATMEGA169PA-AU, whose sleep currents are substantially lower; the trade-off is verifying the PA's slightly different electrical characteristics against the existing firmware timing assumptions.
推薦
Industrial Human-Machine Interfaces
Industrial HMI nodes benefit from the ATMEGA169A-AU's combination of segment LCD drive, 54 GPIO lines, and JTAG boundary-scan for production test. The USART communicates with PLCs or backplanes, SPI and TWI connect keypad controllers and nonvolatile memory, and the 16 MIPS throughput handles menu logic and alarm handling with headroom. The industrial operating range of -40C to +85C supports factory-floor environments. The 1KB SRAM constrains large buffer designs, so keep communication buffers modest or move logging to external memory via TWI. JTAG on-chip debug shortens commissioning cycles because breakpoints and memory inspection are available without additional instrumentation on the final board.
推薦
Sensor Acquisition Nodes
The ATMEGA169A-AU serves as a compact acquisition node: its 10-bit ADC with 8 channels reads multiple analog sensors, the internal reference and prescaler options simplify front-end design, and the AVR core applies filtering or threshold logic locally. Results are streamed over USART or SPI to a host, or logged to EEPROM. Operating up to 16 MHz from 5V yields 16 MIPS for digital filtering, while the -40C to +85C industrial range suits outdoor equipment. Because the ADC is 10-bit, external precision references improve absolute accuracy over the internal reference in metrology-grade nodes. Firmware should average multiple samples to reduce noise since the ADC's effective resolution depends on supply and reference stability.
推薦
Legacy AVR Design Maintenance
Many legacy products built on ATmega169-class silicon remain in service, and the ATMEGA169A-AU keeps those designs maintainable. Because the ATmega169A is functionally compatible with earlier ATmega169 generations, existing ISP programming files, fuse settings, and JTAG fixtures continue to work. For obsolescence-proofing, the pin-compatible ATMEGA169PA-AU and larger ATmega329A/649A family members share the same 64-TQFP footprint, letting one PCB layout absorb Flash-size upgrades with no re-spin. When requalifying a legacy board, verify the frequency-versus-voltage operating curve and any errata differences between generations, then confirm EEPROM retention requirements against the datasheet endurance specification before approving the substitution.
推薦
Educational and Prototyping Platforms
The ATMEGA169A-AU is a practical teaching platform because it exposes the full AVR feature set, single-cycle RISC execution, ISP Flash, EEPROM, ADC, and three timers, plus a segment LCD controller that gives students immediate visual feedback from their first programs. The JTAG interface supports on-chip debugging with standard tools, so learners can single-step code and inspect registers on real hardware. At 5V the part tolerates common bench wiring mistakes better than lower-voltage MCUs, and its 2.7V operation demonstrates supply-scaling concepts. Prototyping with the 64-TQFP requires an adapter board or a pre-assembled target PCB, as the 0.5 mm pitch is beyond comfortable hand soldering.
推薦
推薦產品摘要
工程參考資料，適用於 ATMEGA169A-AU — 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 | ATMEGA169PA-AU | ATMEGA169P-16AU | ATMEGA329A-AU | ATMEGA649A-AU |
|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 16 KB | 32 KB | 64 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB | 4 KB |
| EEPROM | 512 B | 512 B | 512 B | 1 KB | 2 KB |
| LCD Controller | Yes (up to 25 seg x 4 com) | Yes - same | Yes - same | Yes - family LCD | Yes - family LCD |
| Power Feature | Standard power modes | picoPower (lowest sleep current) | picoPower generation | Standard power modes | Standard power modes |
主要差異化特點
- Integrated segment LCD controller (對比ATMEGA168P-20AU)
- Current-production standard power variant (對比ATMEGA169PA-AU)
- Lowest-cost entry in same footprint (對比ATMEGA329A-AU)
設計說明
Respect the frequency-versus-voltage operating envelope: full 16 MHz operation is valid near 5V, but the maximum safe clock derates as VCC falls toward 2.7V. If the design runs from a 3.3V rail, verify the datasheet derating curve before fixing the crystal, and leave at least 10% margin. For battery products, budget the 512B EEPROM writes too, since EEPROM endurance is consumed over product life. When sleep current dominates the battery budget, substitute the pin-compatible ATMEGA169PA-AU picoPower variant instead of redesigning the board.
Place 100 nF ceramic decoupling capacitors at each VCC/GND pair of the 64-TQFP, as close to the pins as routing allows, plus bulk capacitance near the regulator. The LCD segment lines benefit from series routing discipline: keep them away from the crystal and high-current traces to avoid ghost segments from capacitive coupling. Route AVCC separately with its own filter (ferrite plus capacitor) if the 10-bit ADC is used, since digital switching noise on AVCC directly degrades ADC accuracy.
The TQFP-64 0.5 mm pin pitch is not hand-solderable for prototypes; plan stencil reflow or hot-plate assembly. Fuse configuration is a classic trap: setting the wrong clock-source fuses (e.g., enabling an external crystal that is absent) can brick the device until a working clock or high-voltage parallel programmer recovers it. Also confirm the correct part memory map when substituting ATmega329/649 family parts, since Flash, SRAM, and EEPROM sizes change and linker scripts or bootloader assumptions may need updating.
合規資訊
RoHS/lead-free status per standard Microchip AU-suffix (TQFP green) packaging conventions; verify on the Microchip product page environmental data sheet for certificate-level confirmation.
