MSP430F1491 - 8MHz 16-bit MCU, 60KB Flash | TI
MPN: MSP430F1491 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.38 | $73.80 |
| 100 | $6.45 | $645.00 |
| 500 | $5.8 | $2,900.00 |
| 1,000 | $5.22 | $5,220.00 |
Drop-in alternatives for MSP430F1491 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
MSP430F149IPM
β Drop-Inπ Reference alternative (not in catalog)
MSP430F1481IPM
β Drop-Inπ Reference alternative (not in catalog)
MSP430F1471IPM
β Drop-Inπ Reference alternative (not in catalog)
MSP430F148IPM
β Drop-Inπ Reference alternative (not in catalog)
MSP430F147IPM
β Drop-Inπ Reference alternative (not in catalog)
MSP430F1491 Maximum Ratings & Electrical Characteristics
| Core | MSP430 CPU16 (16-bit RISC) |
| Maximum Clock Frequency | 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 |
| Standby Wakeup Time | < 6 us |
| ADC Resolution | 12-bit |
| USART Interfaces | 2 (UART/SPI) |
| Timers | 2 x 16-bit |
| GPIO Count | 48 |
| Hardware Peripherals | Comparator, hardware multiplier |
| Package | 64-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Power-Saving Modes | 5 |
| Operating Temperature | [DATA_NEEDED: operating temperature range] |
MSP430F1491 Pin Configuration
| Pin 1 | DVCC β Digital supply voltage |
| Pin 2 | P6.3/A3 β GPIO / ADC input channel 3 |
| Pin 7 | XIN β Crystal oscillator input |
| Pin 8 | XOUT β Crystal oscillator output |
| Pin 9 | DVSS β Digital ground |
| Pin 10 | AVCC β Analog supply voltage |
| Pin 11 | AVSS β Analog ground |
| Pin 40 | P3.3/UTXD0 β GPIO / USART0 transmit |
| Pin 41 | P3.2/URXD0 β GPIO / USART0 receive |
| Pin 34 | P3.1/UTXD1 β GPIO / USART1 transmit |
| Pin 33 | P3.0/URXD1 β GPIO / USART1 receive |
| Pin 63 | TDO/TDI β JTAG test data out / in |
| Pin 64 | TMS β JTAG test mode select |
| Pin 62 | RST/NMI β Reset / non-maskable interrupt |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
MSP430F1491 is suitable for 6 applications: Battery-Powered Metering, Portable Instrumentation, Industrial Sensor Nodes, Data Loggers, Building Automation Sensors, Low-Power Control Nodes.
Battery-Powered Metering
The MSP430F1491's 1.6 uA standby current and 0.1 uA RAM-retention mode allow multi-year battery life in energy and water meters. The 12-bit ADC digitizes analog sensing front-ends while the hardware multiplier accelerates metering computation. Placed in a duty-cycled topology, the MCU sleeps between measurement bursts and wakes in under 6 us, keeping average current in the microamp range. Two USARTs provide communication interfaces for metering buses or optical readout heads.
Recommended
Portable Instrumentation
Handheld instruments benefit from the MSP430F1491's 1.8 V to 3.6 V operation directly from two alkaline cells and its 280 uA active current at 1 MHz. The 48 GPIOs drive keypads and LCDs, the 12-bit ADC reads sensors, and the hardware multiplier speeds filtering math. Firmware in 60KB Flash supports complex menus and calibration tables. Low standby current preserves battery life between measurements, while sub-6-us wakeup delivers instant-on response.
Recommended
Industrial Sensor Nodes
The two USARTs of the MSP430F1491 interface with RS-485 transceivers and legacy serial sensors, while the 12-bit ADC and comparator handle local analog monitoring. Its wide 1.8 V to 3.6 V supply tolerates battery-backed supply sag in industrial environments. The 60KB Flash hosts protocol stacks and data logging with 2KB SRAM used for ring buffers. Timer resources support periodic sampling and pulse counting from flow or energy meters.
Recommended
Data Loggers
The MSP430F1491 records sensor data to external flash via SPI using one USART, with the 12-bit ADC capturing analog channels at timed intervals. With 0.1 uA off-mode current, the logger idles for hours between samples without draining the battery. The hardware multiplier accelerates any on-device statistics or scaling. 60KB Flash holds calibration, configuration, and bootloader code, while 2KB SRAM buffers samples before writing to external nonvolatile memory.
Recommended
Building Automation Sensors
Wall-powered and battery-backed occupancy, temperature, and humidity sensors use the MSP430F1491 for its low sleep current and adequate peripheral set. The comparator provides zero-power threshold detection to wake the MCU on events, while the ADC samples analog sensors. The 64-LQFP package offers enough GPIOs for LED indication, communication wiring, and configuration DIP switches without port expanders, reducing BOM cost in high-volume sensor nodes.
Recommended
Low-Power Control Nodes
Timers and 48 GPIOs let the MSP430F1491 drive relays and actuators in energy-conscious control systems such as irrigation, HVAC dampers, and lighting controllers. The 8 MHz core executes closed-loop control loops within tight energy budgets, and the five power-saving modes let the controller sleep between events. Two USARTs link to HMI panels or supervisory controllers, while in-system programmable Flash enables field firmware updates over serial.
Recommended
Recommended Products Summary
Engineering reference data for MSP430F1491 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MSP430F149IPM | MSP430F1481IPM | MSP430F147IPM |
|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP - same | 64-LQFP - same | 64-LQFP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Flash Memory | 60KB + 256B | 60KB + 256B | 48KB + 256B | 32KB + 256B |
| SRAM | 2KB | 2KB | 2KB | 1KB |
| Max CPU Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| ADC | 12-bit | 12-bit | 12-bit | 12-bit |
| USART Count | 2 | 2 | 2 | 2 |
| 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 |
Key Differentiators
- Maximum Flash in F14x1 family (vs MSP430F1481IPM)
- Larger SRAM than F147 class parts (vs MSP430F147IPM)
- Hardware multiplier (vs MSP430F13x family members)
Design Notes
Separate AVCC/AVSS from DVCC/DVSS and decouple each with 100 nF ceramics close to the pins plus a 10 uF bulk capacitor. The 12-bit ADC accuracy depends directly on analog supply quality; a ferrite bead between AVCC and DVCC reduces digital switching noise coupling. Keep the 1.8 V minimum in mind when using two-cell battery supplies with series diodes - dropout can push the rail below the operating floor during end-of-discharge.
Use XIN/XOUT with a proper watch crystal and load capacitors per the crystal datasheet; keep traces short and guard with ground for stable DCO/FLL reference. Route USART lines away from the crystal. For JTAG debugging, provide a standard 14-pin header with RST/NMI access, or plan Spy-Bi-Wire for production programming with minimal pin usage.
The 2KB SRAM is small by modern standards - stack overflow from deep call trees or large printf buffers is the most common failure mode. Monitor stack usage in CCS. Also, RST/NMI pin requires a 47k pullup and 10 nF capacitor for reliable reset; do not leave it floating in noisy industrial environments.
Compliance Information
RoHS compliance per TI product listing; verify suffix-specific material declarations via TI product ecology reports.
