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Texas Instruments MSP430G2855IDA38
- Part No.:
- MSP430G2855IDA38
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 38-TSSOP (0.240", 6.10mm Width)
- Datasheet:
-
MSP430G2855IDA38.pdf
- Description:
- IC MCU 16BIT 48KB FLASH 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,376
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Product details
Overview
MSP430G2855IDA38 from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller in 38-pin TSSOP (DA) package, featuring 48 kB flash, 4 kB RAM, dual 16-bit Timer_A modules (TA0/TA1), one 16-bit Timer_B (TB0), 10-bit 200-ksps ADC with 12 channels, USCI_A0/USCI_B0 for UART/IrDA/SPI/I²C, and on-chip comparator for analog signal processing - deployed in battery-powered sensor nodes and portable measurement systems.
For engineers reviewing the MSP430G2855IDA38 datasheet, MSP430G2855IDA38 pinout, MSP430G2855IDA38 application, or MSP430G2855IDA38 equivalent, key selection criteria include its 48 kB flash capacity, 12-channel ADC with autoscan and DTC support, 38-pin TSSOP footprint, ultra-low active current (250 µA @ 1 MHz, 2.2 V), and integrated touch-sense I/O capability across up to 32 pins.
Technical Context
The MSP430G2855IDA38 implements a 16-bit RISC CPU with 62.5-ns instruction cycle time, constant generators, and seven addressing modes - enabling high code efficiency in resource-constrained embedded designs. Its basic clock system integrates DCO (calibrated up to 16 MHz), LF oscillator, and crystal support (32 kHz / HF up to 16 MHz), delivering flexible clock sourcing for low-power timing-critical functions.
Five software-selectable low-power modes (LPM0–LPM4) enable sub-µA standby (0.7 µA) and 0.1 µA off-mode (RAM retention). Wake-up from standby occurs in under 1 µs via interrupt sources including GPIO, timers, ADC, USCI, and comparator - critical for duty-cycled sensing applications requiring rapid responsiveness and extended battery life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 62.5-ns instruction cycle; supports register-to-register operations in single cycle for deterministic real-time control. |
| Flash / RAM | 48 kB flash program memory + 4 kB RAM; enables complex firmware with data buffering and calibration storage without external memory. |
| ADC10 | 10-bit, 200-ksps SAR ADC with 12 input channels, internal reference, sample-and-hold, autoscan, and DMA (DTC) support - suitable for multi-sensor analog acquisition. |
| Timers | Two 16-bit Timer_A (TA0, TA1) with three capture/compare registers each; one 16-bit Timer_B (TB0) with three capture/compare registers - supports PWM generation, input capture, interval timing, and quadrature decoding. |
| USCI Peripherals | USCI_A0 (UART/LIN/IrDA/SPI) + USCI_B0 (SPI/I²C); enables robust serial communication with host MCUs, sensors, or displays using hardware-accelerated protocols. |
| Power Consumption | Active mode: 250 µA @ 1 MHz, 2.2 V; Standby mode: 0.7 µA; Off mode (RAM retention): 0.1 µA - extends coin-cell battery life to years in intermittent-sensing applications. |
| I/O Capability | Up to 32 touch-sense-enabled I/O pins with individually programmable pullup/pulldown resistors and pin-oscillator support - eliminates external capacitive touch controllers. |
Pinout & Package
Package: 38-pin Thin Shrink Small Outline Package (TSSOP), DA suffix, 0.65 mm pitch, body size 12.5 × 6.1 mm - compatible with standard surface-mount assembly and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 / TEST/SBWTCK | Spy-Bi-Wire test clock input | Enables in-system programming and debug via two-wire interface; no external programming voltage required. |
| 2 / DVCC | Digital supply voltage | 1.8–3.6 V digital core power rail; decoupling capacitor placement critical for noise-sensitive ADC/timer operation. |
| 6 / RST/NMI/SBWTDIO | Reset/non-maskable interrupt/test data I/O | Combines reset assertion, NMI event input, and Spy-Bi-Wire bidirectional data - simplifies board-level reset circuitry. |
| 31 / P1.0/TA0CLK/ADC10CLK | GPIO / Timer_A0 clock / ADC conversion clock | Configurable as external clock source for precise timing of ADC sampling or timer synchronization. |
| 30 / P2.4/TA0.2/A4/VREF+/VEREF+ | GPIO / Timer_A0 compare output / ADC channel A4 / positive reference | Shared pin enables simultaneous analog input, reference output, and timer control - reduces pin count in compact designs. |
| 29 / P2.3/TA0.1/A3/VREF−/VEREF− | GPIO / Timer_A0 compare output / ADC channel A3 / negative reference | Supports differential ADC measurements and internal reference configuration without external components. |
| 25 / P3.5/UCA0RXD/UCA0SOMI | USCI_A0 receive / SPI slave-out-master-in | Hardware UART RX or SPI MISO - ensures reliable full-duplex communication with minimal CPU overhead. |
| 24 / P3.4/UCA0TXD/UCA0SIMO | USCI_A0 transmit / SPI slave-in-master-out | Hardware UART TX or SPI MOSI - enables asynchronous command reception or synchronous sensor data streaming. |
| 16 / AVCC | Analog supply voltage | Separate 1.8–3.6 V analog rail; must be filtered independently from DVCC to maintain ADC SNR > 60 dB. |
| 15 / AVSS | Analog ground reference | Isolated analog return path; requires star grounding with AVCC decoupling to minimize ADC quantization noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 0.1 µA off-mode (RAM retention) and <1 µs wake-up enable energy harvesting and battery-only deployments lasting >10 years. |
| Integrated analog subsystem | 12-channel 10-bit ADC with autoscan, DTC, and internal reference eliminates need for external ADC drivers or reference ICs. |
| Touch-sense I/O capability | 32 pins support capacitive touch sensing via built-in pin oscillators - replaces dedicated touch controller ICs and reduces BOM cost. |
| Programmable code protection | Security fuse prevents unauthorized flash readout; BSL password protection enables secure field firmware updates over UART. |
| Flexible clock system | DCO calibrated at factory for 1/8/12/16 MHz; supports crystal (32 kHz or HF), internal VLO, and resistor-tuned DCO - adapts to diverse timing accuracy needs. |
| On-chip emulation logic | Spy-Bi-Wire interface provides full JTAG-like debug capability using only two pins - simplifies production programming and field diagnostics. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and ambient light at 1-minute intervals, transmitting data via UART to BLE module. IC Role / Device Role / Timing Role: Central MCU managing sensor polling, ADC conversion, data preprocessing, and serial handoff - operating primarily in LPM3 with periodic wake-up. Use Value: 0.7 µA standby current and 250 µA active current extend CR2032 battery life beyond 3 years; integrated ADC and USCI eliminate external signal conditioning ICs. |
Use Scenario: Handheld pulse oximeter acquiring analog photodiode signals, performing real-time SpO₂ calculation, and displaying results on segmented LCD. IC Role / Device Role / Timing Role: Signal acquisition MCU with synchronized ADC sampling, timer-driven LED pulsing, and LCD refresh control - leveraging Timer_B for precise LED timing. Use Value: 12-channel ADC with autoscan captures dual-wavelength photodiode inputs simultaneously; 48 kB flash stores calibration tables and firmware algorithms. |
| Industrial Control Panel | Smart Meter Interface Module |
Use Scenario: DIN-rail mounted HMI panel monitoring relay status, reading potentiometer inputs, and driving local LEDs and buzzer alerts. IC Role / Device Role / Timing Role: Local control MCU handling GPIO scanning, analog knob adjustment, and audio/visual feedback - using Timer_A for PWM dimming and tone generation. Use Value: 32 touch-sense I/O pins enable direct capacitive button integration; brownout detector ensures safe shutdown during AC line dips. |
Use Scenario: Utility meter add-on module interfacing with metrology IC via SPI, logging tamper events, and communicating via RS-485 to concentrator. IC Role / Device Role / Timing Role: Communication bridge MCU with USCI_B0 (SPI) for metrology IC readout and USCI_A0 (UART) for RS-485 transceiver control. Use Value: Dual USCI modules allow concurrent metrology data acquisition and serial protocol translation; 4 kB RAM buffers event logs during comms outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430G2955IDA38 | 56 kB flash, 56 I/O pins, same peripherals and package - adds 8 kB flash and 8 additional GPIO vs. MSP430G2855IDA38. | Preferred where firmware complexity exceeds 48 kB or more GPIO are needed for expanded sensor/actuator interfaces. | Select when future firmware growth or additional I/O routing is anticipated; identical pinout allows drop-in upgrade if PCB layout reserves space. |
| MSP430G2755IDA38 | 32 kB flash, 32 I/O pins, otherwise identical peripheral set and power profile - reduces memory and I/O count by 16 kB and 16 pins. | Suitable for cost-optimized designs with simpler firmware and fewer analog/digital interfaces. | Choose for high-volume, price-sensitive applications where 32 kB flash suffices and I/O count is constrained; shares same DA package footprint. |
Compared with MSP430G2955IDA38 and MSP430G2755IDA38, the MSP430G2855IDA38 delivers optimal balance of flash capacity (48 kB), I/O count (48), and ultra-low-power performance - making it ideal for mid-complexity sensor edge nodes requiring field-upgradable firmware without over-provisioning resources.
Availability
MSP430G2855IDA38 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, industrial control panels, and smart meter interface modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MSP430G2855IDA38 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 ultra-low-power microcontrollers for industrial, medical, and consumer applications.
The MSP430G2xx series was designed specifically for battery-operated, measurement-intensive embedded systems - emphasizing nanowatt power management, integrated analog front-ends, and robust in-field programmability without external high-voltage programming circuits.
FAQ
What is the maximum operating frequency of the MSP430G2855IDA38?
The MSP430G2855IDA38 supports a maximum system clock (MCLK) frequency of 16 MHz, achieved via its digitally controlled oscillator (DCO) with factory-calibrated settings stored in information memory segment A. This allows deterministic real-time execution at 62.5-ns instruction cycle time while maintaining ultra-low power consumption - verified across the full 1.8–3.6 V supply range per SLAS800.
Does the MSP430G2855IDA38 support hardware UART communication?
Yes, the MSP430G2855IDA38 includes USCI_A0, which provides full hardware UART functionality with auto-baudrate detection, LIN support, IrDA encoding/decoding, and synchronous SPI - accessible on pins P3.4 (UCA0TXD) and P3.5 (UCA0RXD) in the 38-pin TSSOP package. This eliminates bit-banged UART implementation and ensures reliable serial communication at up to 1 Mbps.
How many analog input channels does the ADC10 module support on the MSP430G2855IDA38?
The ADC10 module on the MSP430G2855IDA38 supports 12 analog input channels (A0–A7, A12–A15), as confirmed in Table 1 of SLAS800. These channels are accessible via dedicated pins including P2.0–P2.4, P3.6–P3.7, and P4.3–P4.7 - enabling simultaneous sampling of multiple sensors with autoscan and DMA (DTC) support to reduce CPU load.
Can the MSP430G2855IDA38 perform capacitive touch sensing without external components?
Yes, the MSP430G2855IDA38 supports up to 32 touch-sense-enabled I/O pins using its integrated pin oscillator circuitry - allowing direct capacitive button/slider implementation without external RC networks or dedicated touch controller ICs. Each pin can be individually configured for touch sensing via the PxIES, PxIE, and PxIFG registers per the MSP430x2xx Family User's Guide (SLAU144).
What debug interface does the MSP430G2855IDA38 use, and how many pins are required?
The MSP430G2855IDA38 uses the Spy-Bi-Wire (SBW) interface for debugging and programming, requiring only two pins: TEST/SBWTCK (Pin 1) and RST/NMI/SBWTDIO (Pin 6). This two-wire interface provides full JTAG-equivalent functionality including breakpoints, register inspection, and flash programming - eliminating the need for four-pin JTAG headers and reducing PCB footprint.
MSP430G2855IDA38 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 38-TSSOP (0.240", 6.10mm Width)
- Series:
- MSP430G2xx
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPU16
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SCI, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 48KB (48K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430G2855IDA38 FAQ
1.How can I place an order for MSP430G2855IDA38 through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430G2855IDA38 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 MSP430G2855IDA38 reliable?
The price and inventory of MSP430G2855IDA38 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430G2855IDA38 is usually 5 days.
3.What payment methods are accepted for MSP430G2855IDA38?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430G2855IDA38 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430G2855IDA38?
MSP430G2855IDA38 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430G2855IDA38 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 MSP430G2855IDA38?
For technical support, including MSP430G2855IDA38 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430G2855IDA38 requirements.
6.How does Aetrix verify that MSP430G2855IDA38 is sourced from the original manufacturer or authorized distributors?
All MSP430G2855IDA38 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 MSP430G2855IDA38 meets industry standards.
7.What is the process for return or replacement of MSP430G2855IDA38?
All MSP430G2855IDA38 units undergo pre-shipment inspection (PSI). If there is an issue with MSP430G2855IDA38, 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 MSP430G2855IDA38 part is unused and in its original packaging.
Return procedure for MSP430G2855IDA38:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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