MSP430F1491 - 8MHz 16-bit MCU, 60KB Flash 64-LQFP | TI
部品番号: MSP430F1491 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.3 | $113.00 |
| 100 | $9.8 | $980.00 |
| 500 | $8.9 | $4,450.00 |
| 1,000 | $8.2 | $8,200.00 |
MSP430F1491 概要
An MCU (microcontroller unit) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die. The MSP430 family occupies the ultra-low-power tier of the embedded processor hierarchy, sitting between general-purpose microcontrollers and dedicated ASSPs, and is designed for battery-operated and energy-harvesting systems where average current draw - not peak performance - is the dominant design constraint.
Key features include an ultra-wide low supply range of 1.8 V to 3.6 V, active-mode consumption of just 280 uA at 1 MHz and 2.2 V, standby current of 1.6 uA, and RAM-retention off mode of 0.1 uA. Five software-selectable low-power modes (LPM0 through LPM4) and wakeup from standby in under 6 us allow aggressive duty-cycling that multiplies battery life by orders of magnitude versus always-on MCUs.
Architecturally, the MSP430F1491 pairs a 16-bit RISC pipeline with an orthogonal instruction set and flash-based program memory with in-system programmability (ISP). Two built-in 16-bit timers (Timer_A and Timer_B) and a hardware multiplier accelerate math-intensive loops without CPU overhead. The two USARTs each function as asynchronous UART or synchronous SPI, and the 12-bit ADC with integrated sample-and-hold serves direct analog sensing. The F14x1 variant shares the MSP430F14x footprint, offering code- and hardware-compatible family scalability.
Typical applications include battery-powered metering, portable instrumentation, sensor data loggers, and low-power industrial control nodes that need dual serial ports for connectivity plus the 12-bit ADC for analog channels. The 48 GPIOs support keypads, LCDs, and relay drive logic.
Design consideration: budget memory carefully - 60KB Flash is ample for C-compiled firmware, but 2KB SRAM limits large buffers; use ring buffers and avoid heap fragmentation.
This page synthesizes distributor data, same-family drop-in alternatives, and practical design notes beyond the manufacturer datasheet.
ドロップイン代替品: MSP430F1491 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
MSP430F1481
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MSP430F1471
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MSP430F149
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MSP430F148
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MSP430F169
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MSP430F1491 最大定格＆電気的特性
| Core | MSP430 CPU16 16-bit RISC |
| 最大クロック周波数 | 8 MHz |
| Flash Memory | 60KB (60K x 8 + 256B) |
| SRAM | 2KB |
| Supply Voltage Range | 1.8 V to 3.6 V |
| Active Mode Current | 280 uA at 1 MHz, 2.2 V |
| Standby Mode Current | 1.6 uA |
| Off Mode Current (RAM Retention) | 0.1 uA |
| Wakeup Time From Standby | Less than 6 us |
| Low-Power Modes | 5 power-saving modes |
| ADC Resolution | 12-bit |
| USART Interfaces | 2 (UART or SPI, software selectable) |
| Timers | 2 x 16-bit (Timer_A, Timer_B) |
| Hardware Multiplier | Yes |
| Comparator | Yes |
| GPIO Count | 48 I/O pins |
| パッケージ | 64-LQFP (PM), 10 x 10 mm |
| 実装タイプ | Surface Mount |
| Program Memory Type | Flash, in-system programmable |
MSP430F1491 64-lqfp (pm), 10 x 10 mm ピン配置ガイド
MSP430F1491 (64-lqfp (pm), 10 x 10 mm パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: MSP430F1491.
詳細は データシート をご参照ください。
主な用途
MSP430F1491 の用途: 6 件s: Battery-Powered Utility Metering, Portable Instrumentation, Sensor Data Loggers, Industrial Control Nodes, Building Automation and Security Sensors, Legacy Design Maintenance and Second Sourcing.
Battery-Powered Utility Metering
The MSP430F1491 is a natural fit for water, gas, and electricity meters, where the entire product must run for years on a lithium cell. Its 1.6 uA standby current and 0.1 uA RAM-retention off mode let the MCU sleep between measurement windows, and wakeup from standby in under 6 us means an hourly or per-second sampling schedule adds almost nothing to average consumption. The 12-bit ADC reads flow or voltage/current channels directly, while the hardware multiplier accelerates energy-accumulation math without CPU cycles. The two USARTs handle meter-bus, RS-485, or optical communication heads, and 60KB Flash holds tariff and billing firmware. Place the MCU in LPM3 between samples and clock the ADC from a scheduled timer to keep average current in the single-digit uA range.
おすすめ
Portable Instrumentation
Handheld instruments - multimeters, environmental meters, portable dataloggers - demand both low average power and real analog capability, which the MSP430F1491 delivers in one chip. The integrated 12-bit ADC with sample-and-hold digitizes sensor front ends without an external converter, and the comparator supports zero-cross or threshold detection in hardware, offloading the sleeping CPU. At 280 uA active (1 MHz, 2.2 V), the device preserves battery life during measurement bursts, while 48 GPIOs drive keypads and segment LCDs. Two USARTs provide a PC link (UART) and peripheral expansion (SPI) simultaneously. Because the 2KB SRAM is limited, stream samples to external SPI flash or process them in fixed-point with the hardware multiplier rather than buffering in RAM.
おすすめ
Sensor Data Loggers
Long-deployment data loggers for temperature, humidity, pressure, or vibration benefit directly from the MSP430F1491's duty-cycle architecture. The device sleeps in LPM3 at 1.6 uA, wakes in under 6 us on a timer interrupt, reads the 12-bit ADC or an external SPI sensor, applies calibration math via the hardware multiplier, and stores records over USART0 SPI to flash memory. With 60KB Flash, the firmware can embed calibration tables, compression routines, and communication stacks without external code storage. A single CR2032 or two AA cells can power multi-month to multi-year logging campaigns. Design the clock tree around a 32.768 kHz watch crystal for accurate timekeeping at microwatt cost, and use the DCO only for short active bursts.
おすすめ
Industrial Control Nodes
Low-power industrial nodes - valve controllers, remote I/O, pump monitors - use the MSP430F1491's dual USARTs for fieldbus (RS-485) and local service (UART) connectivity while the 12-bit ADC monitors process analog signals such as pressure transducers and 4-20 mA loops via a sense resistor. Timer_A and Timer_B generate PWM outputs for actuators and provide capture inputs for flow or encoder pulse counting in hardware, independent of CPU load. The 1.8 V to 3.6 V supply range tolerates battery-backup sag, and 48 GPIOs interface relays, optocouplers, and status LEDs. In noisy environments, isolate the RS-485 transceiver and route ADC sense lines away from switching loads to protect the 12-bit converter's effective resolution.
おすすめ
Building Automation and Security Sensors
Wireless and wired building sensors - occupancy detectors, door contacts, smoke alarm front ends - exploit the MSP430F1491's comparator for hardware threshold detection while the CPU sleeps at 0.1 uA (RAM retention), and its 12-bit ADC for periodic sensor polling. Two USARTs allow one port to drive a wireless module (UART) and the other an SPI EEPROM for configuration storage. At 8 MHz, there is headroom for sensor-fusion filtering and protocol handling, while the hardware multiplier accelerates CRC and averaging. Because many of these products must pass long-life battery requirements, schedule all measurement into short active bursts from LPM3 and power-gate the radio between transmissions; the sub-6-us wakeup ensures negligible latency on events.
おすすめ
Legacy Design Maintenance and Second Sourcing
A large installed base of MSP430F14x-based products continues in production worldwide, and the MSP430F1491 serves as the continuity device for these designs. Because the entire F14x/F14x1 family shares the same 64-LQFP (PM) footprint and pinout, maintenance engineers can second-source or substitute MSP430F148, MSP430F1481, or MSP430F1471 devices without PCB changes - only flash size changes (48KB/32KB versus 60KB). This page's drop-in comparison and pricing data help procurement qualify alternates quickly. When migrating to new designs, TI recommends the MSPM0 family, but for sustaining existing sockets the F14x1 family remains the safest, fully code-compatible choice, preserving JTAG debug access and the established CCS/IAR toolchain.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MSP430F1491 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MSP430F1481 | MSP430F1471 | MSP430F149 | MSP430F169 |
|---|---|---|---|---|---|
| Package | 64-LQFP (PM) 10x10 mm | 64-LQFP (PM) 10x10 mm - same | 64-LQFP (PM) 10x10 mm - same | 64-LQFP (PM) 10x10 mm - same | 64-LQFP (PM) 10x10 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Flash Memory | 60KB + 256B | 48KB + 256B | 32KB + 256B | 60KB + 256B | 60KB + 256B |
| SRAM | 2KB | 2KB | 1KB | 2KB | 2KB |
| Maximum CPU Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| ADC | 12-bit (ADC12) | 12-bit (ADC12) | 12-bit (ADC12) | 12-bit (ADC12) | 12-bit (ADC12) |
| Serial Interfaces | 2 x USART (UART/SPI) | 2 x USART (UART/SPI) | 2 x USART (UART/SPI) | 2 x USART (UART/SPI) | 2 x USART with extended F16x features (DMA, I2C-capable USCI) |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Active Mode Current | 280 uA at 1 MHz, 2.2 V | 280 uA at 1 MHz, 2.2 V | 280 uA at 1 MHz, 2.2 V | 280 uA at 1 MHz, 2.2 V | 280 uA at 1 MHz, 2.2 V |
主な差別化要因
- Maximum flash in the F14x1 family （vs MSP430F1481)
- More SRAM than the smallest family member （vs MSP430F1471)
- Simplest peripheral set for legacy compatibility （vs MSP430F169)
設計ノート
Design the clock tree around a 32.768 kHz watch crystal on LFXT1 for LPM3 timekeeping at microwatt cost, and use the DCO or XT2 (high-frequency) only for short active bursts. At 280 uA active versus 1.6 uA standby, a 1% duty cycle at 1 MHz yields an average current near 4 uA - the key to multi-year battery life. Keep the supply within 1.8 V to 3.6 V; brown-out below 1.8 V triggers reset, so add adequate bulk capacitance on battery-switching events.
The 2KB SRAM is the most common MSP430F1491 design constraint. Avoid deep call stacks, large static buffers, and heap use in C firmware; prefer fixed-size ring buffers and place large constant tables in flash with the 'const' keyword so the linker keeps them out of RAM. Also note this F1xx generation uses 4-wire JTAG (TCK/TMS/TDI/TDO), not Spy-Bi-Wire - reserve these pins on your PCB header, or plan to fuse-blow JTAG protection understanding it is irreversible.
For 12-bit ADC accuracy, isolate the analog domain: keep AVcc/AVss traces short, use a local 100 nF plus 10 uF decoupling pair on AVcc, and route analog sense lines away from the XT2 oscillator and USART switching lines. Use a solid ground plane and connect DVss/AVss at a single star point. Decouple VCC (DVcc) with 100 nF at each supply pin. If XT2 is unused, configure P2 pins as GPIO to recover two I/O and avoid oscillator-fault interrupts.
コンプライアンス情報
Compliance details were not present in the provided web data; confirm RoHS/REACH status on the TI product page at https://www.ti.com/product/MSP430F1491 before procurement.
