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Texas Instruments MSP430A045IPWR
- Part No.:
- MSP430A045IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MSP430A045IPWR.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
MSP430A045IPWR from Texas Instruments is an ultralow-power 16-bit RISC microcontroller featuring 4KB flash memory, 256B RAM, a 10-bit 200-ksps ADC with internal reference and data transfer controller, Timer_A with three capture/compare registers, and basic clock module supporting crystal, resistor, or external clock sources. It operates from 1.8 V to 3.6 V and targets battery-powered sensor nodes and portable measurement systems.
For engineers reviewing the MSP430A045IPWR datasheet, MSP430A045IPWR pinout, MSP430A045IPWR application, or MSP430A045IPWR equivalent, this page delivers verified functional identity, confirmed 20-pin TSSOP package mapping, validated I/O and peripheral pin assignments, real low-power mode timing (e.g., <6 µs wake-up), and two technically documented alternative parts for mixed-signal embedded design selection.
Technical Context
The MSP430A045IPWR implements the MSP430x11x2 architecture with a 16-bit CPU, constant generators, and seven addressing modes enabling single-cycle register operations. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, and selectable internal resistors - all optimized for sub-6 µs active-mode wake-up from LPM3/LPM4.
It includes 14 digital I/O pins across Ports P1 (8 pins) and P2 (6 pins), a 10-bit SAR ADC with autoscan and DTC, and Timer_A3 with three independent capture/compare channels. USART0 is absent - confirming it belongs to the x11x2 family, not x12x2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 general-purpose registers and constant generators for high code efficiency |
| Memory | 4KB flash + 256B RAM - sufficient for compact firmware with ADC-driven sensor processing |
| ADC | 10-bit, 200-ksps SAR with internal reference, sample-and-hold, autoscan, and DTC - enables autonomous multi-channel analog acquisition |
| Power Modes | Five software-selectable low-power modes; standby current = 0.7 µA, off-mode (RAM retention) = 0.1 µA |
| Wake-Up Time | <6 µs from standby to active mode - critical for event-triggered ultra-low-duty-cycle operation |
| Clock Sources | Internal DCO, 32-kHz crystal, single external resistor, or external clock - supports flexible, low-BOM timing |
| Supply Range | 1.8 V to 3.6 V - compatible with single-cell Li-ion, LiFePO₄, or dual-AA alkaline systems |
Pinout & Package
Package: 20-pin TSSOP (PW), RoHS-compliant, body size 6.5 mm × 4.4 mm, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 / TEST | JTAG test mode select input | Enables boundary-scan and debug access via JTAG interface on P1.x pins |
| 2 / VCC | Positive supply voltage | Primary power rail (1.8–3.6 V); requires local decoupling near pin |
| 3 / P2.5/ROSC | DCO resistor input / general I/O | Connects external resistor to set nominal DCO frequency; configurable as GPIO |
| 4 / VSS | Ground reference | System return path; must be low-impedance for ADC and low-noise operation |
| 5 / XOUT | Crystal oscillator output | Drives external 32-kHz crystal in low-frequency mode; open-drain output |
| 6 / XIN | Crystal oscillator input | Accepts 32-kHz crystal or external clock signal; high-impedance CMOS input |
| 7 / RST/NMI | Reset / non-maskable interrupt | PuLL-up required externally; asserts reset on falling edge or brownout condition |
| 8 / P2.0/ACLK/A0 | ACLK output / ADC channel 0 input | Provides auxiliary clock for peripherals; also serves as first analog input channel |
| 9 / P2.1/INCLK/A1 | Timer_A input clock / ADC channel 1 input | Accepts external clock for Timer_A; doubles as second analog input |
| 10 / P2.2/TA0/A2 | Timer_A capture/compare 0 / ADC channel 2 input | Supports PWM generation or event capture; third analog input with BSL receive capability |
| 11 / P2.3/TA1/A3/VREF− | Timer_A capture/compare 1 / ADC channel 3 / negative reference | Enables dual-function I/O; provides ADC reference ground when internal VREF used |
| 12 / P2.4/TA2/A4/VREF+ | Timer_A capture/compare 2 / ADC channel 4 / positive reference | Configurable as analog input or reference source; supports ratiometric measurements |
| 13 / P1.0/TACLK/ADC10CLK | Timer_A clock input / ADC conversion clock | Accepts external clock for precise timing control of both peripherals |
| 14 / P1.1/TA0 | Timer_A capture/compare 0 / BSL transmit | Primary UART TX for bootloader; supports PWM output or edge-triggered capture |
| 15 / P1.2/TA1 | Timer_A capture/compare 1 | Dedicated compare output or input for time-stamping and pulse-width modulation |
| 16 / P1.3/TA2 | Timer_A capture/compare 2 | Third independent PWM or capture channel for multi-signal timing control |
| 17 / P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Drives peripheral modules; doubles as programming interface clock |
| 18 / P1.5/TA0/TMS | Timer_A compare 0 / JTAG test mode select | Shared function enables debug access without additional pins |
| 19 / P1.6/TA1/TDI/TCLK | Timer_A compare 1 / JTAG test data input / test clock | Multi-role pin reduces footprint while supporting full emulation capability |
| 20 / P1.7/TA2/TDO/TDI | Timer_A compare 2 / JTAG test data output/input | Final JTAG pin; TDO/TDI selection controlled by JTAG instruction |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-power operation | 0.1 µA off-mode current with RAM retention enables >10-year battery life in coin-cell applications |
| Integrated ADC with DTC | Autonomous 10-bit sampling across up to 5 channels without CPU intervention - reduces active time |
| Fast wake-up capability | <6 µs transition from LPM3 to active mode allows rapid response to external interrupts or sensor events |
| On-chip programmable DCO | Digitally controlled oscillator eliminates need for external high-frequency crystal in many timing-critical functions |
| Hardware-based BSL | UART-based serial programming via P1.1/P2.2 enables field firmware updates without JTAG hardware |
| Supply brownout protection | Embedded POR/BOR circuit ensures reliable reset during power ramp-up or dip - prevents erratic execution |
Applications
| Portable Gas Sensor Node | Wireless Temperature Transmitter |
|---|---|
|
Use Scenario: Battery-powered electrochemical gas detection unit sampling multiple analog sensors at 1 Hz with wireless wake-on-event transmission. IC Role / Device Role / Timing Role: Main system controller executing sensor readout, calibration math, and low-power radio handshaking; uses DCO for timing and ADC DTC for zero-CPU sampling. Use Value: 0.1 µA off-mode and <6 µs wake-up extend CR2032 lifetime beyond 5 years while maintaining sub-second response to hazardous gas thresholds. |
Use Scenario: Self-powered industrial temperature monitor using thermistor or RTD, logging data every 10 seconds and transmitting via sub-GHz RF link. IC Role / Device Role / Timing Role: Analog front-end processor and scheduler; configures ADC autoscan across 3 channels (temp, VBAT, reference), triggers RF burst only on delta change. Use Value: Integrated 10-bit ADC with internal reference eliminates external precision voltage source, reducing BOM cost and layout area by 30%. |
| Smart Meter Tamper Detection | Low-Power Glass Breakage Detector |
|
Use Scenario: Utility meter add-on module detecting physical tampering via accelerometer and magnetic switch, reporting only on violation. IC Role / Device Role / Timing Role: Event-driven state machine monitoring digital inputs and analog comparator outputs; enters LPM4 between events. Use Value: Five power-saving modes and dedicated NMI pin allow immediate wake-up from deep sleep (<0.1 µA) on magnet removal or shock event - no polling overhead. |
Use Scenario: Standalone acoustic security sensor analyzing window vibration signatures using wave digital filter algorithms. IC Role / Device Role / Timing Role: Real-time DSP engine performing 16-bit RISC-based filtering on ADC samples; uses Timer_A for precise audio sampling intervals. Use Value: 125 ns instruction cycle and 16-bit register architecture enable efficient FIR filter execution within 200 µA active current - avoids external DSP. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-power mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F1122IPW | Identical 4KB/256B memory, same 20-pin TSSOP package, identical pinout and peripheral set - direct functional match | No deviation in use cases; validated for same sensor node, metering, and security applications | Select MSP430F1122IPW when requiring TI's standard production part number with full documentation traceability |
| MSP430F1132IPW | 8KB flash (vs. 4KB), otherwise identical architecture, package, pinout, and peripherals | Preferred where firmware complexity exceeds 4KB - e.g., added cryptographic stack or multi-protocol RF support | Choose MSP430F1132IPW if future firmware growth or feature expansion is anticipated without PCB redesign |
Compared with MSP430A045IPWR, MSP430F1122IPW offers identical functionality and drop-in compatibility, while MSP430F1132IPW provides double the flash capacity with no timing, power, or interface trade-offs - enabling scalable firmware development within the same hardware platform.
Availability
MSP430A045IPWR is available at Aetrix Electronics and suitable for portable sensor nodes, smart utility meters, and battery-powered security devices requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature ranges.
Supply support for MSP430A045IPWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in low-power microcontrollers and precision analog signal chains.
The MSP430x11x2 product line was designed specifically for ultralow-power mixed-signal applications demanding extended battery life, fast wake-up, and integrated analog peripherals - targeting portable instrumentation, sensing, and energy-harvesting systems.
FAQ
What is the exact memory configuration of the MSP430A045IPWR?
The MSP430A045IPWR contains 4KB of flash memory for program storage and 256 bytes of RAM for runtime variables and stack. This matches the MSP430F1122 specification exactly and is confirmed in the SLAS361D datasheet section "MSP430x11x2 Family Members." No ROM or information memory beyond the standard 256-byte info flash segment is allocated for boot code in this variant.
Does the MSP430A045IPWR include a hardware USART or UART peripheral?
No, the MSP430A045IPWR does not include USART0 or any UART hardware peripheral. It belongs to the MSP430x11x2 family, which lacks serial communication modules - unlike the x12x2 series. Communication must be implemented via bit-banged GPIO or external transceivers, as confirmed in the functional block diagram and "USART0 (MSP430x12x2 Only)" section of SLAS361D.
What package type and pin count does the MSP430A045IPWR use?
The MSP430A045IPWR is packaged in a 20-pin plastic TSSOP (PW), with dimensions 6.5 mm × 4.4 mm and 0.65 mm lead pitch. This is explicitly listed under "AVAILABLE OPTIONS" in SLAS361D and matches the pinout diagram labeled "DW or PW PACKAGE (TOP VIEW)" for the MSP430x11x2 family.
Can the MSP430A045IPWR operate from a single 1.8-V supply?
Yes, the MSP430A045IPWR supports a minimum supply voltage of 1.8 V, as specified in the "Low Supply Voltage Range" headline and absolute maximum ratings table of SLAS361D. All peripherals - including ADC, Timer_A, and flash programming - remain fully functional across the 1.8 V to 3.6 V range, with typical active current of 200 µA at 1 MHz and 2.2 V.
How is firmware programmed into the MSP430A045IPWR in-system?
Firmware can be programmed into the MSP430A045IPWR via three methods: (1) JTAG interface using the TEST, TCK, TMS, TDI, and TDO pins (P1.4–P1.7 and TEST); (2) onboard bootstrap loader (BSL) using UART signals on P1.1 (TX) and P2.2 (RX); or (3) in-system programming by the CPU itself. The BSL requires no external voltage and is protected by a user-configurable password.
MSP430A045IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Series:
- MSP430x1xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430
- Core Size:
- 16-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 14
- Program Memory Size:
- 4KB (4K x 8 + 256B)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430A045IPWR FAQ
1.How can I place an order for MSP430A045IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430A045IPWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MSP430A045IPWR reliable?
The price and inventory of MSP430A045IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430A045IPWR is usually 5 days.
3.What payment methods are accepted for MSP430A045IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430A045IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430A045IPWR?
MSP430A045IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430A045IPWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MSP430A045IPWR?
For technical support, including MSP430A045IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430A045IPWR requirements.
6.How does Aetrix verify that MSP430A045IPWR is sourced from the original manufacturer or authorized distributors?
All MSP430A045IPWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MSP430A045IPWR meets industry standards.
7.What is the process for return or replacement of MSP430A045IPWR?
All MSP430A045IPWR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430A045IPWR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MSP430A045IPWR part is unused and in its original packaging.
Return procedure for MSP430A045IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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