Texas Instruments TMS320R2811PBKA

Overview

TMS320R2811PBKA from Texas Instruments is a 32-bit C28x fixed-point digital signal processor (DSP) optimized for real-time motor control and power conversion systems. It features a 150-MHz CPU, 128 KB on-chip flash memory, 18 KB RAM, dual 12-bit ADCs with simultaneous sampling, two event manager modules (EVA/EVB), and integrated PWM, QEP, and capture peripherals. It operates at 3.3-V I/O with 1.8-V core voltage and targets industrial servo drives and digital power supplies.

For engineers reviewing the TMS320R2811PBKA datasheet, TMS320R2811PBKA pinout, TMS320R2811PBKA application, or TMS320R2811PBKA equivalent, key selection criteria include its 128-pin LQFP (PBK) package, 150-MHz deterministic real-time execution, dual 12-bit 16-channel ADC with ≤1-μs conversion time, 16-PWM output capability, and support for sensorless FOC algorithms in motor control firmware.

Technical Context

The TMS320R2811PBKA implements the C28x CPU core with Harvard architecture, 32-bit data path, and 40-bit extended precision accumulator. Its memory subsystem includes 128 KB of on-chip flash (with ECC), 18 KB of RAM (M0/M1 SARAM), and boot ROM with secure code protection. The device lacks the external interface (XINTF) block found in the TMS320R2812, distinguishing it as a cost-optimized variant for embedded control where external memory expansion is unnecessary.

Real-time peripheral integration includes two independent Event Manager modules-each with GP timers, full-compare units, programmable dead-band generators, quadrature encoder pulse (QEP) circuits, and capture units-and an enhanced ADC supporting both sequential and simultaneous dual-channel sampling modes. Clocking is managed via an internal oscillator and PLL capable of generating SYSCLKOUT up to 150 MHz from a 5–20 MHz crystal or external clock source.

Key Specifications

Pinout & Package

128-pin Low-Profile Quad Flat Package (LQFP), PBK suffix, 20 × 20 mm body, 1.0-mm lead pitch, exposed thermal pad (non-electrical). Pinout defined per Section 2.3.3 "Pin Assignments for the PBK Package" and Figure 2−3 in SPRS257C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital signal processing applications.

Compared with TMS320F2812PGSA, the TMS320R2811PBKA trades external memory expansion for compact 128-pin layout and lower system cost; versus TMS320F28035PNT, it delivers superior real-time ADC synchronization and legacy motor control IP compatibility at the expense of newer HRPWM features.

Availability

TMS320R2811PBKA is available at Aetrix Electronics and suitable for industrial motor drives, digital power supplies, solar inverters, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TMS320R2811PBKA 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The TMS320R281x series was designed specifically for high-reliability, real-time digital control of electric motors and power electronics - emphasizing deterministic timing, integrated analog capture, and robust peripheral sets for closed-loop systems.

FAQ

What is the maximum operating frequency of the TMS320R2811PBKA?

The TMS320R2811PBKA operates at a maximum CPU frequency of 150 MHz, achieved via its on-chip PLL that multiplies an external 5–20 MHz clock source. This frequency enables deterministic execution of complex motor control algorithms within strict real-time deadlines, such as 10-kHz current loops with sub-microsecond latency. The TMS320R2811PBKA maintains this performance across its specified industrial temperature range (–40°C to 105°C).

Does the TMS320R2811PBKA support simultaneous sampling on both ADC modules?

Yes, the TMS320R2811PBKA supports true simultaneous sampling across its dual 12-bit ADC modules (ADC-A and ADC-B), allowing synchronized acquisition of two analog signals - for example, phase A and phase B motor currents - within a single system clock cycle. This capability is explicitly documented in Section 6.29.7 of SPRS257C and is critical for accurate vector control without sampling-induced phase errors.

What package type does the TMS320R2811PBKA use, and is it RoHS compliant?

The TMS320R2811PBKA uses a 128-pin Low-Profile Quad Flat Package (LQFP) with PBK suffix, 20 × 20 mm body, and 1.0-mm lead pitch. Per TI's official product change notices and packaging documentation, this package is lead-free and RoHS compliant, meeting JEDEC J-STD-020 moisture sensitivity level 3 requirements for standard reflow assembly.

How much on-chip memory does the TMS320R2811PBKA include?

The TMS320R2811PBKA integrates 128 KB of on-chip flash memory with built-in error correction coding (ECC), 18 KB of RAM (split into M0 and M1 SARAM blocks), and 4 KB of boot ROM. This memory configuration supports standalone operation without external storage, enabling secure firmware execution and fast boot times - essential for industrial equipment requiring zero external dependencies.

Is the TMS320R2811PBKA pin-compatible with the TMS320R2812?

No, the TMS320R2811PBKA is not pin-compatible with the TMS320R2812. The TMS320R2812 uses a 176-pin LQFP (PGF) or 179-ball BGA (GHH/ZHH) package, whereas the TMS320R2811PBKA uses a 128-pin LQFP (PBK) package. Additionally, the TMS320R2812 includes the external interface (XINTF) block and additional GPIOs not present in the TMS320R2811PBKA - making direct PCB replacement impossible without layout revision.