SA8281 Mitel Networks Corporation, SA8281 Datasheet

SA8281

Manufacturer Part Number

SA8281

Description

Three-Phase PWM Waveform Generator

Manufacturer

Mitel Networks Corporation

Datasheet

1.SA8281.pdf (14 pages)

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waveforms for the control of variable speed AC machines,

uninterruptible power supplies and other forms of power

electronic devices which require pulse width modulation as a

means of efficient power control.

switches in a three-phase inverter bridge. This is usually via an

external isolation and amplification stage.

consumption.

sequences controls the shape, power frequency, amplitude,

and rotational direction (as defined by the red-yellow-blue

phase sequence) of the output waveform. Parameters such as

the carrier frequency, minimum pulse width, and pulse delay

time may be defined during the initialisation of the device. The

pulse delay time (underlap) controls the delay between turning

on and off the two power switches in each output phase of the

inverter bridge, in order to accommodate variations in the turn-

on and turn-off times of families of power devices.

fully-digital generation of PWM waveforms gives unprecedented

accuracy and temperature stability. Precision pulse shaping

capability allows optimum efficiency with any power circuitry.

The device operates as a stand-alone microprocessor

peripheral, reading the power waveform directly from an

internal ROM and requiring microprocessor intervention only

when operating parameters need to be changed.

data from the microprocessor/controller. This is a standard

MOTEL

and a zero setting is included in order to implement DC

injection braking with no software overhead.

MA828 PWM generator . Two standard wave shapes are

available to cover most applications. In addition, any

symmetrical wave shape can be integrated on-chip to order.

FEATURES

The SA828 PWM generator has been designed to provide

The six TTL level PWM outputs (Fig. 2) control the six

The SA828 is fabricated in CMOS for low power

The SA828 is easily controlled by a microprocessor and its

An 8-bit multiplexed data bus is used to receive addresses and

Rotational frequency is defined to 12 bits for high accuracy

Fully Digital Operation

Interfaces with Most Microprocessors

Wide Power-Frequency Range

12-Bit Speed Control Accuracy

Carrier Frequency Selectable up to 24kHz

Waveform Stored in Internal ROM

Double Edged Regular Sampling

Selectable Minimum Pulse Width and Underlap Time

DC Injection Braking

Information contained within the pulse width modulated

This family is pin and functionally compatible with the

bus, compatible with most microprocessors/controllers.

Three-Phase PWM Waveform Generator

ORDERING INFORMATION

SA8281/IG/DP1S (28-lead DIL, sine + third harmonic

SA8282/IG/DP1S (28-lead DIL, sine waveform)

SA8281/IG/MP1S (28-lead SOIC, Sine + third

SA8382/IG/MP1S (28-lead SOIC, sine waveform)

MOTEL is a registered Trademark of Intel Corp. and Motorola Corp.

Fig. 1 Pin connections – top view (not to scale)

WR* (R/W†)

ALE* (AS†)

RD* (DS†)

WR* (R/W†)

ALE* (AS†)

RD* (DS†)

RPHB

YPHB

TRIP

CLK

RST

RPHB

YPHB

TRIP

RST

CLK

† = Motorola bus format

waveform)

harmonic waveform)

= Intel bus format

SA828

SA828 Family

DS4226 - 2.0 November 1996

VDD

ZPPB

ZPPY

ZPPR

WSS

RPHT

SET TRIP

YPHT

BPHT

BPHB

VDD

ZPPB

ZPPY

ZPPR

WSS

RPHT

SET TRIP

YPHT

BPHT

BPHB

DP28

MP28

Related parts for SA8281

SA8281 Summary of contents

Page 1

... RPHB 13 YPHB 14 Fig. 1 Pin connections – top view (not to scale) ORDERING INFORMATION SA8281/IG/DP1S (28-lead DIL, sine + third harmonic waveform) SA8282/IG/DP1S (28-lead DIL, sine waveform) SA8281/IG/MP1S (28-lead SOIC, Sine + third harmonic waveform) SA8382/IG/MP1S (28-lead SOIC, sine waveform) MOTEL is a registered Trademark of Intel Corp. and Motorola Corp. ...

Page 2

SA828 ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following conditions (unless otherwise stated + AMB DC Characteristics Characteristic Input high voltage Input low voltage Input leakage current Output high voltage Output ...

Page 3

CS BUS MOTEL CONTROL INTERFACE SYSTEM 8 BUS BUS DEMULTIPLEXER AD - RST CLOCK CLOCK DIVIDER FUNCTIONAL DESCRIPTION An asynchronous method of PWM generation is used with uniform or ‘double-edged’ regular sampling of ...

Page 4

SA828 PWM SWITCHING INSTANTS +1 0 – – 1 Fig. 3 Asynchronous PWM generation with‘double-edged’ regular sampling as used by the SA828 t 1 ALE ...

Page 5

MICROPROCESSOR BUS TIMING Intel Mode (Fig. 4 and Table 1) The address is latched by the falling edge of ALE. Data is written from the bus into the SA828 on the rising edge of WR not used in ...

Page 6

SA828 The power frequency range is a function of the carrier waveform frequency ( f ) and a multiplication factor m , CARR determined by the 3-bit FRS word. The value determined as shown in Table 5. ...

Page 7

PWM SIGNAL BEFORE PULSE DELETION PWM SIGNAL AFTER PULSE DELETION t = PULSE DELETION TIME pd Control Register Programming The control register should only be programmed once the initialisation register contains the basic operating parameters of the SA828. As with ...

Page 8

SA828 AMP AMP AMP AMP AMP AMPLITUDE SELECT WORD AMP = MSB 7 = LSB AMP 0 Fig.14 Temporary register R2 Amplitude selection The power waveform amplitude is determined by scaling the amplitude of the ...

Page 9

Control Register Programming Example The control register would normally be updated many times while the motor is running, but just one example is given here assumed that the initialisation register has already heen programmed with the parameters given ...

Page 10

SA828 HARDWARE INPUT/OUTPUT FUNCTIONS Set Output Trip (SET TRIP input) The SET TRIP input is provided separately from the microprocessor interface in order to allow an external source to override the microprocessor and provide a rapid shutdown facility. For example, ...

Page 11

RECTIFIER AND SMOOTHING SINGLE OR 3-PHASE POWER SUPPLY Fig typical SA828 application INVERTER – DC LINK 3-PHASE VARIABLE VOLTAGE, VARIABLE FREQUENCY WAVEFORM + 6 ISOLATOR TTL LEVEL FAST PWM 6 SHUTDOWN WAVEFORMS SA828 8 DATA/ADDRESS ...

Page 12

SA828 12 ...

Page 13

PACKAGE DETAILS Dimensions are shown thus: mm (in). For further package information, please contact your local Customer Service Centre. 28 SPOT REF. CHAMFER 1 REF. 0·74 (0·029) MAX. 14·73 (0·58) MAX 1·14/1·65 (0·045/0·065) 5·08/(0·200) MAX SEATING PLANE 0·38/0·61 (0·015/0·024) 7·40/7·60 ...

Page 14

SA828 HEADQUARTERS OPERATIONS MITEL SEMICONDUCTOR Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (01793) 518000 Fax: (01793) 518411 MITEL SEMICONDUCTOR 1500 Green Hills Road, Scotts Valley, California 95066-4922 United States of America. Tel (408) 438 2900 Fax: (408) 438 ...

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