Texas Instruments TM4C1231H6PMIR

Overview

TM4C1231H6PMIR from Texas Instruments is an ARM Cortex-M4F-based microcontroller with 256 KB Flash, 32 KB SRAM, and integrated USB 2.0 OTG controller, ADC (12-bit, 1MSPS), PWM, and multiple serial interfaces (UART, SPI, I²C). It operates at up to 80 MHz and supports hibernation mode with RTC and battery-backed memory for low-power embedded control in industrial sensors and motor drives.

For engineers reviewing the TM4C1231H6PMIR datasheet, TM4C1231H6PMIR pinout, TM4C1231H6PMIR application, or TM4C1231H6PMIR equivalent, key selection criteria include its 100-pin LQFP package, -40°C to +105°C industrial temperature range, integrated FPU for real-time signal processing, and TivaWare™ software support for rapid firmware development.

Technical Context

The TM4C1231H6PMIR integrates a 32-bit ARM Cortex-M4F core with single-precision floating-point unit and 200 MHz system clock capability (via PLL), enabling deterministic DSP operations. It features a 12-channel μDMA controller that offloads CPU during peripheral transfers, and a hibernation module with dedicated RTC, battery-backed RAM, and wake-on-external-interrupt capability.

On-chip analog includes one 12-bit, 1-MSPS ADC with eight sample sequencers and hardware averaging, plus two analog comparators. System-level integration includes ROM-based bootloader, configurable GPIOs with slew-rate control, and JTAG/SW-DP debug interface compliant with ARM CoreSight standards.

Key Specifications

Pinout & Package

TM4C1231H6PMIR is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow TI's standard Tiva C Series pin mapping for consistent PCB layout across family members.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TM4C1231H6PMIR, TM4C123GH6PM offers CAN instead of USB with identical packaging and firmware compatibility, while STM32F407VGT6 provides greater memory and speed at the expense of USB integration and increased board-level design effort.

Availability

TM4C1231H6PMIR is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term lifecycle assurance, and extended temperature operation.

Supply support for TM4C1231H6PMIR 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 wireless technologies, with decades of experience in industrial and automotive-grade microcontrollers.

The TM4C1231H6PMIR belongs to TI's Tiva C Series, designed specifically for cost-sensitive, real-time embedded applications demanding robust analog integration, low-power hibernation, and USB connectivity without external components.

FAQ

What is the maximum operating frequency of the TM4C1231H6PMIR?

The TM4C1231H6PMIR operates at a maximum system clock frequency of 80 MHz, achieved using its on-chip PLL with an external 4–25 MHz crystal or clock source. This frequency is fully supported across the entire industrial temperature range (-40°C to +105°C), and all peripherals-including USB, ADC, and timers-are rated for synchronous operation at this speed. The TM4C1231H6PMIR datasheet specifies timing margins and voltage requirements to maintain reliable operation at 80 MHz under worst-case conditions.

Does the TM4C1231H6PMIR include a hardware floating-point unit?

Yes, the TM4C1231H6PMIR integrates a single-precision ARM Cortex-M4F Floating-Point Unit (FPU) compliant with IEEE 754-2008. This hardware accelerator executes floating-point instructions in one cycle for most operations, significantly improving performance for mathematical-intensive tasks such as motor control algorithms, sensor fusion, and digital filtering. The TM4C1231H6PMIR FPU is enabled by default on reset and requires no external components or configuration beyond standard CMSIS initialization.

How does the hibernation mode work on the TM4C1231H6PMIR?

The TM4C1231H6PMIR hibernation module retains RTC timekeeping and 2 KB of SRAM using a separate VBAT supply (e.g., coin cell), drawing less than 2 µA in deep sleep. It supports wake events from external pins, RTC alarm, or low-battery detection. The TM4C1231H6PMIR enters hibernation via software command and resumes full operation within microseconds upon wake-preserving register context and enabling seamless recovery without bootloader reinitialization.

Is USB functionality integrated into the TM4C1231H6PMIR without external components?

Yes, the TM4C1231H6PMIR includes a full-speed USB 2.0 OTG controller with integrated PHY, supporting device, host, and OTG roles. Only external series resistors (22 Ω) and ESD protection diodes are required on the USB0_P/N lines; no external transceiver or level shifter is needed. The TM4C1231H6PMIR USB module is certified for CDC, HID, and MSC class compliance and is supported by TI's TivaWare USB library with example projects for mass storage and virtual COM port implementations.

What debug interfaces are supported by the TM4C1231H6PMIR?

The TM4C1231H6PMIR supports both JTAG and ARM Serial Wire Debug (SWD) interfaces through dedicated pins (TCK, TMS, TDI, TDO, nTRST, SWCLK, SWDIO). SWD is recommended for production programming due to its 2-pin footprint and lower pin count, while JTAG remains available for legacy tools and boundary-scan testing. The TM4C1231H6PMIR debug interface is fully compatible with TI's XDS110 debugger, Segger J-Link, and OpenOCD-based toolchains.