Texas Instruments MSP430F5505IRGZT

Overview

MSP430F5505IRGZT from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller with integrated USB 2.0 PHY, 16 KB flash, 4 KB + 2 KB RAM, 10-bit ADC (6 external + 2 internal channels), single USCI (UART/IrDA/SPI/I²C), four 16-bit timers, RTC, hardware multiplier, and DMA - designed for battery-powered sensor systems and USB-connected data loggers.

For engineers reviewing the MSP430F5505IRGZT datasheet, MSP430F5505IRGZT pinout, MSP430F5505IRGZT application, or MSP430F5505IRGZT equivalent, key selection criteria include USB 2.0 full-speed integration, 31 I/O pins in 48-pin VQFN, LPM4.5 shutdown current of 0.18 µA, 16-MHz max CPU clock, and compatibility with TI's MSP430Ware and Code Composer Studio toolchain.

Technical Context

The MSP430F5505IRGZT implements a digitally controlled oscillator (DCO) with FLL stabilization, supports dual crystal oscillators (XT1 at 32 kHz, XT2 up to 32 MHz), and integrates a programmable LDO core regulator. Its unified clock system enables dynamic clock source switching between ACLK, SMCLK, and MCLK without software intervention.

USB functionality is implemented via an on-die PHY, dedicated USB-PLL, and dual-voltage power system (3.3 V and 1.8 V), supporting eight endpoints and automatic suspend/resume. The single USCI module is configurable via port mapping controller on P4 to support UART, IrDA, SPI, or I²C - but not all simultaneously due to pin multiplexing constraints in the RGZ package.

Key Specifications

Pinout & Package

VQFN-48 (RGZ) package, 7 mm × 7 mm, 0.5-mm pitch, exposed thermal pad (recommended connection to DVSS).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MSP430F5504IRGZT, the MSP430F5505IRGZT provides 2× flash for enhanced firmware flexibility without changing PCB layout; versus MSP430F5506IRGZT, it trades 8 KB flash for lower unit cost while retaining identical peripheral functionality and power profile.

Availability

MSP430F5505IRGZT is available at Aetrix Electronics and suitable for USB-connected data loggers, analog sensor hubs, and industrial field monitors requiring stable component supply and long-term production continuity.

Supply support for MSP430F5505IRGZT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on low-power innovation and industrial reliability.

The MSP430F5505IRGZT belongs to the MSP430F5xx ultra-low-power MCU family, engineered for energy-constrained applications demanding integrated USB, precision analog, and real-time responsiveness - especially in portable instrumentation and smart sensors.

FAQ

What is the maximum operating frequency of the MSP430F5505IRGZT?

The MSP430F5505IRGZT supports a maximum system clock frequency of 25 MHz, though its rated operational speed is 16 MHz under standard conditions. The DCO with FLL stabilization achieves this using internal or external reference sources, and timing-critical applications must observe the recommended operating conditions in Section 5.3 of the SLAS645L datasheet to ensure reliable execution at 16 MHz. The MSP430F5505IRGZT maintains full functionality across its entire voltage range (1.8 V to 3.6 V) at this speed.

Does the MSP430F5505IRGZT support USB device enumeration without external components?

Yes, the MSP430F5505IRGZT supports full USB 2.0 full-speed device enumeration with no external transceiver or level shifters required. Its integrated USB-PHY, USB-PLL, and dual-voltage regulators (3.3 V and 1.8 V) handle signal integrity and power conditioning. The internal 1.5-kΩ pull-up resistor on PUR (Pin 39) connects automatically during enumeration, and DP/DM (Pins 38/40) meet USB electrical specifications when routed with controlled impedance. External 27-Ω series resistors are recommended per USB-IF guidelines.

How many analog input channels does the ADC in the MSP430F5505IRGZT support?

The MSP430F5505IRGZT features a 10-bit ADC (ADC10_A) with six external analog input channels (A0–A5 on P6.0–P6.5) and two internal channels (VeREF+ and VeREF− on P5.0/P5.1), totaling eight usable inputs. This matches the "6 ext, 2 int" specification in Table 3-1 of the SLAS645L datasheet. Channel selection is software-controlled via ADC10CTL1, and the window comparator function operates independently on any selected channel.

Can the USCI module on the MSP430F5505IRGZT operate as both UART and I²C simultaneously?

No, the MSP430F5505IRGZT contains only one USCI module (USCI_B1), which can be configured as either UART/IrDA/SPI (via A-function mapping) or I²C/SPI (via B-function mapping), but not both concurrently. Pin assignment is managed by the port mapping controller on P4, and simultaneous use requires careful signal routing - e.g., UART on P4.4/P4.5 and I²C on P3.0/P3.1 is not possible because P3.x pins are not connected to USCI in the RGZ package per Figure 4-4. Dual-protocol operation requires external bridging or time-multiplexed configuration.

What is the purpose of the VCORE pin (Pin 13) on the MSP430F5505IRGZT?

The VCORE pin (Pin 13) on the MSP430F5505IRGZT supplies the regulated core voltage (1.8 V nominal) generated internally by the integrated LDO. It must be decoupled with a 1-µF ceramic capacitor to DVSS and is not intended for external regulation. This pin reflects the stabilized voltage driving the CPU, RAM, and digital logic; deviations beyond ±5% indicate LDO fault or excessive load. VCORE is distinct from DVCC (I/O supply) and AVCC (analog supply), and its stability directly impacts timing accuracy and low-power mode entry/exit reliability in the MSP430F5505IRGZT.