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TI rolls MCUs, PMICs, motor drivers

Posted: 15 Oct 2012 ?? ?Print Version ?Bookmark and Share

Keywords:MCU? PMIC? motor driver? Hercules TMS570? TPS65381-Q1?

Texas Instruments Inc. (TI) has released 12 Hercules TMS570 ARM Cortex-R4 safety microcontrollers (MCUs), complementary TPS65831-Q1 multi-rail safety power management IC (PMIC) and DRV3201-Q1 safety motor driver. The Hercules TMS570 safety MCUs, along with TI's first functional safety PMIC and the industry's first functional safety motor driver, form a "safety motor control chipset" and maximise failure detection and mitigation while minimising software overhead, stated the company.

The motor control safety chipset adheres to the SafeTI-26262 and SafeTI-6150 design packages, helping customers more easily achieve ISO 26262 and IEC 61508 certification and accelerate time to market with safety-critical automotive and transportation motor control applications.

Geared for advanced driver assistance systems, electric power steering, hybrid and electric vehicles, rail propulsion control, aviation anti-skid control, off-road vehicles and more, the Hercules TMS570 safety MCUs expand the product line to include 36 configurations from which customers can choose to meet application-specific needs. The Hercules TMS570LS12x/11x floating-point safety MCUs provide additional memory and performance configurations with expanded motor control capabilities while the Hercules TMS570LS04x/03x safety MCUs provide a smaller package, lower cost, entry-line solution with integrated motor control interfaces. The compatible PMIC combines multiple power supplies and safety features in a single device to reduce design time and board space, TI noted. In addition, the motor driver supports start/stop functionality and integrates functional safety architecture for protection and monitoring.

The Hercules TMS570 safety MCUs feature an expanded range of performance and memory options, from 80-180MHz lockstep ARM Cortex-R4 cores and 256KB, 384KB, 1MB and 1.25MB flash, provide designers more choices and scalability for their feature-rich safety products. Also, designers can achieve ISO 26262 and IEC 61508 more easily�in system designs through component compliance to industry safety standards.

The MCU's hardware safety features provide a high level of online diagnostics with lockstep cores; memory protection for the CPU and bus masters; error correction code (ECC) for flash and RAM with single-bit error correction and double-bit error detection (SECDED); CPU and RAM built-in-self-test (BIST) for detection of potential latent faults; intelligent error signalling module for action based on safety error; parity on peripheral RAMs; redundant ADCs and timers; and continuous voltage and clock monitoring.

In addition, the MCUs offer integrated motor control capability with enhanced pulse width modulation, sensor capture and quadrature encoder interfaces on chip eliminate multiple external components for motor control. The 32-channel timer coprocessor serves as a diverse, redundant motor control channel and checks the integrity of the pulse-width modulators (PWMs) in the motor control loop. Moreover, the on-chip FlexRay, CAN, Ethernet, LIN connectivity enables standard automotive networks and provides several options for data collection.

TI's PMIC, the TPS65381-Q1, includes multiple power supply rails in a single device, including an asynchronous buck switch-mode power-supply converter with internal FET that converts the input battery voltage to 6V pre-regulator output, which supplies other regulators. Two linear regulators with internal FETs can supply power to a CAN and to the MCU input/outputs (I/Os). One linear regulator controller supplies the MCU core. This integration reduces design time and saves PCB space. The PMIC has an additional integrated sensor supply that provides both short-to-ground and short-to-battery protection that can supply power to a sensor outside the electronic control unit (ECU).

Moreover, the PMIC touts a functional safety architecture that integrates features such as question-answer watchdog, MCU error-signal monitor, clock monitoring on internal oscillators, self-check on clock monitor, cyclic redundancy check (CRC) on non-volatile memory and a reset circuit for the MCU. A BIST allows for monitoring the device functionality at start-up, and a dedicated diagnostic state allows the MCU to check the PMIC safety functions, removing the need for an additional monitoring MCU to reduce cost and PCB space.

The DRV3201-Q1 is a bridge driver dedicated to automotive three-phase brushless DC motor, providing six dedicated drivers for normal level N-channel MOSFET transistors up to 250nC charge. The driver source/sink currents are programmable for easy output slope adjustment. In addition, TI claims that the device is the first motor driver in the market that supports start/stop functionality, allowing full control on the power stages at low battery voltage down to 4.75V. It also has a functional safety architecture that integrates features such as voltage drain-to-source (VDS) monitoring, phase-comparators, shoot-through protection, dead-time control, temperature warning and protection, battery voltage detection for under and over voltage protection.

Hercules TMS570 MCUs range from $5 to $22 in 1,000-unit quantities and samples are available for order. A variety of free software and tools ranging from $79 to $599 are also available. The TPS65381-Q1 will be available in a HTSSOP-32 (DAP) PowerPad package in December at $2.60 in 1,000-unit quantities. The DRV3201-Q1 will be available in a HTQFP-64 (PAP) PowerPad�package in 2012 at $3.10 in 1,000 quantities.

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