Arrow Plastic Network Card manual Quantum Leap in Low-End Motor Control

MICROCONTROLLER

SOLUTIONS

A Quantum Leap in Low-End Motor Control

Integrated motor-control timer, zero-wait Flash and easy system development

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HS7125EDB01H

Development

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Low-end motor control applications require increasingly sophisticated control algorithms to squeeze improvements in energy efficiency from the new generation of motors. The SH/Tiny from Renesas is designed to meet these needs, and to bring design advantages when compared to standard digital signal processors.

The 50MHz SH/Tiny devices, designated DF7125xx50Fxx, have been designed with a focus on the details of motor control; Renesas believes that for this reason they represent a quantum leap in the cost-performance ratio of low-end motor drives.

The MCUs are based on a simple, easily understood architecture, which is optimised for C programming. Designers are supported with a free optimising compiler that produces high-quality code. Simplicity is also provided by the use of a single 5V power supply with a typical run current of 52mA. The designer can therefore employ a standard power supply in a standard package.

The SH/Tiny includes two channels of 10-bit, 5V A/D conversion, providing improved noise resistance when compared with 3V alternatives.

To enable safety features, the SH/Tiny has an internal watchdog timer that will continue to run even if the external oscillator stops. EMC behaviour is another important contributor to safe operation: here the SH/Tiny offers best-in-class performance. Renesas also provides free software routines to meet the IEC 60730-1 standard.

The heart of the SH/Tiny’s motor control capabilities is a specially designed timer block, MTU2, that includes six channels of 16-bit timers, supporting three-phase PWM capability with automatic dead-time insertion and compensation. The devices also feature a quadrature encoder feedback capability and a channel that can measure actual dead times, enabling closed loop control for higher motor efficiency.

Each of the two ADCs can be triggered by the MTU2 with an additional, defined delay time to support algorithms such as single-

shunt motor drive. Port output-enable pins provide a hardware connection to shut down the timer quickly and deterministically when necessary.

Equipped with 8Kbyte SRAM and options of 128Kbyte, 64Kbyte or 32Kbyte Flash, the SH/Tiny has very fast Flash programming and erase times (1ms and 1.2s, respectively per 128bytes), which can save significant cost in the production flow. The use of Renesas’ MONOS Flash technology allows the devices to run at full speed without wait states.

The devices include three SCIs (Serial Communications Interfaces). Package options are 64- or 48-pin LQFP or 52- or 64-pin QFN, depending on precise configuration. Temperature range variants of -20°C to +85°C or -40°C to +85°C are available.

Renesas are offering Arrow Innovation readers the chance to win a HS7125EDB01H development board. Please complete the reply slip or visit http://www.arrowne.com/innov/in214/f_1393.shtml.

Features

U50MHz 32-bit RISC processors

UDedicated MTU2 timer unit

-Six 16-bit timer channels

UAdditional two-channel 16-bit timer

USingle 5V supply

U8Kbyte SRAM

U32Kbyte, 64Kbyte, 128Kbyte Flash variants

-Zero wait states

-Fast erase and programming functions

UC-programmable with free optimising compiler

UTwo 10-bit 5V ADCs

UWatchdog timer

UThree SCIs

UQuadrature encoder input

U64- or 48-pin LQFP; or 52- or 64-pin QFN

UTemperature range: -20°C to +85°C or -40°C to +85°C

Applications

ULow cost motor control

UAir conditioners

UWashing machines

URefrigerators

UVacuum cleaners

UPrinters

UOffice automation

UUPSs

UGeneral purpose inverters

14 ENQUIRY 1393

For further information, including the SuperH DVD and SH/Tiny article and an opportunity to win the Renesas HS7125EDB01H development board, please complete the reply slip or visit http://www.arrowne.com/innov/in214/f_1393.shtml