DataSheet.es    


PDF SA8382IG Data sheet ( Hoja de datos )

Número de pieza SA8382IG
Descripción Three-Phase PWM Waveform Generator
Fabricantes Mitel Networks Corporation 
Logotipo Mitel Networks Corporation Logotipo



Hay una vista previa y un enlace de descarga de SA8382IG (archivo pdf) en la parte inferior de esta página.


Total 14 Páginas

No Preview Available ! SA8382IG Hoja de datos, Descripción, Manual

SA828 Family
Three-Phase PWM Waveform Generator
DS4226 - 2.0 November 1996
The SA828 PWM generator has been designed to provide
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.
The six TTL level PWM outputs (Fig. 2) control the six
switches in a three-phase inverter bridge. This is usually via an
external isolation and amplification stage.
The SA828 is fabricated in CMOS for low power
consumption.
Information contained within the pulse width modulated
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.
The SA828 is easily controlled by a microprocessor and its
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.
An 8-bit multiplexed data bus is used to receive addresses and
data from the microprocessor/controller. This is a standard
MOTELTMbus, compatible with most microprocessors/controllers.
Rotational frequency is defined to 12 bits for high accuracy
and a zero setting is included in order to implement DC
injection braking with no software overhead.
This family is pin and functionally compatible with the
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.
AD3
AD4
AD5
AD6
AD7
WR* (R/W†)
RD* (DS†)
ALE* (AS†)
RST
CLK
CS
TRIP
RPHB
YPHB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SA828
28 AD2
27 AD1
26 AD0
25 VDD
24 ZPPB
23 ZPPY
22 ZPPR
21 WSS
20 RPHT
19 SET TRIP
18 YPHT
17 BPHT
16 VSS
15 BPHB
* = Intel bus format
† = Motorola bus format
DP28
AD3
AD4
AD5
AD6
AD7
WR* (R/W†)
RD* (DS†)
ALE* (AS†)
RST
CLK
CS
TRIP
RPHB
YPHB
1 28
2 27
3 26
4 25
5 24
6 23
7 SA828 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
AD2
AD1
AD0
VDD
ZPPB
ZPPY
ZPPR
WSS
RPHT
SET TRIP
YPHT
BPHT
VSS
BPHB
MP28
FEATURES
s Fully Digital Operation
s Interfaces with Most Microprocessors
s Wide Power-Frequency Range
s 12-Bit Speed Control Accuracy
s Carrier Frequency Selectable up to 24kHz
s Waveform Stored in Internal ROM
s Double Edged Regular Sampling
s Selectable Minimum Pulse Width and Underlap Time
s DC Injection Braking
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.

1 page




SA8382IG pdf
SA828
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.
RD is not used in this mode because the registers in the SA828
are write only. However, this pin must be connected to RD (or
tied high) to enable the SA828 to select the correct interface
format.
Motorola Mode (Fig. 5 and Table 2)
The address is latched on the falling edge of the AS line. Data
is written from the bus into the SA828 (only when R/W is low) on
the falling edge of DS (providing CS is low).
CONTROLLING THE SA828
The SA828 is controlled by loading data into two 24-bit
registers via the microprocessor interface. These registers are
the initialisation register and the control register.
The initialisation register would normally be loaded before
motor operation (i.e., prior to the PWM outputs being activated)
and sets up the basic operating parameters associated with the
motor and inverter. This data would not normally be updated
during motor operation.
The control register is used to control the PWM outputs (and
hence the motor) during operation e.g., stop/start, speed,
forward/reverse etc. and would normally be loaded and changed
only after the initialisation register has been loaded.
As the MOTEL bus interface is restricted to an 8-bit wide
format, data to be loaded into either of the 24-bit registers is first
written to three 8-bit temporary registers R0, R1 and R2 before
being transferred to the desired 24-bit register. The data is
accepted (and acted upon) only when transferred to one of the
24-bit registers.
Transfer of data from the temporary registers to either the
initialisation register or the control register is achieved by a write
instruction to a dummy register. Writing to dummy register R3
results in data transfer from R0, R1 and R2 to the control
register, while writing to dummy register R4 transfers data from
R0, R1 and R2 to the initialisation register. It does not matter
what data is written to the dummy registers R3 and R4 as they
are not real registers. It is merely the write instruction to either
of these registers which is acted upon in order to load the
initialisation and control registers.
AD2 AD1 AD0 Register
Comment
000
R0 Temporary register R0
001
R1 Temporary register R1
010
R2 Temporary register R2
011
R3 Transfers control data
100
R4 Transfers initialisation data
Table 3 SA828 register addressing
Initialisation Register Function
The 24-bit initialisation register contains parameters which,
under normal operation, will be defined during the power-up
sequence. These parameters are particular to the drive circuitry
used, and therefore changing these parameters during a PWM
cycle is not recommended. Information in this register should
only be modified while RST is active (i.e. low) so that the PWM
outputs are inhibited (low) during the updating process.
The parameters set in the initialisation register are as follows:
Carrier frequency
Low carrier frequencies reduce switching losses whereas
high carrier frequencies increase waveform resolution and can
allow ultrasonic operation.
Power frequency range
This sets the maximum power frequency that can be carried
within the PWM output waveforms. This would normally be set
to a value to prevent the motor system being operated outside
its design parameters.
Pulse delay time ('underlap')
For each phase of the PWM cycle there are two control
signals, one for the top switch connected to the positive
inverter DC supply and one for the bottom switch connected to
the negative inverter DC supply. In theory, the states of these
two switches are always complementary. However, due to the
finite and non-equal turn-on and turn- off times of power
devices, it is desirable when changing the state of the output
pair, to provide a short delay time during which both outputs
are off in order to avoid a short circuit through the switching
elements.
Pulse deletion time
A pure PWM sequence produces pulses which can vary in
width between 0% and 100% of the duty cycle. Therefore, in
theory, pulse widths can become infinitesimally narrow. In
practice this causes problems in the power switches due to
storage effects and therefore a minimum pulse width time is
required. All pulses shorter than the minimum specified are
deleted.
Counter reset
This facility allows the internal power frequency counter of
the SA828 to be set to zero, disabling the normal frequency
control and giving a 50% output duty cycle.
Initialisation Register Programming
The initialisation register data is loaded in 8-bit segments into
the three 8-bit temporary registers R0-R2. When all the initialisation
data has been loaded into these registers it is transferred into the
24-bit initialisation register by writing to the dummy register R4.
FRS2 FRS1 FRS0 X X CFS2 CFS2 CFS2
FREQUENCY
RANGE
SELECT WORD
FRS2 = MSB
FRS0 = LSB
DON’T
CARE
CARRIER
FREQUENCY
SELECT WORD
CFS2 = MSB
CFS0 = LSB
Fig. 6 Temporary register R1
Carrier frequency selection
The carrier frequency is a function of the externally applied
clock frequency and a division ratio n, determined by the 3-bit
CFS word set during initialisation. The values of n are selected
as shown in Table 4.
CFS word
101 100 011 010 001 000
Value of n
32 16 8 4 2 1
Table 4 Values of clock division ratio n
The carrier frequency, fCARR, is then given by:
fCARR =
k
512 x n
where k = clock frequency and n = 1, 2, 4, 8, 16 or 32 (as set
by CFS)
Power frequency range selection
The power frequency range selected here defines the maximum
limit of the power frequency. The operating power frequency is
controlled by the 12-bit Power Frequency Select (PFS) word in
the control register but may not exceed the value set here.
5

5 Page





SA8382IG arduino
SA828
R
Y
B
SINGLE OR
3-PHASE
POWER
SUPPLY
RECTIFIER
AND
SMOOTHING
DC LINK
+
INVERTER
3-PHASE AC
INDUCTION
MOTOR
3-PHASE
VARIABLE VOLTAGE,
VARIABLE FREQUENCY
WAVEFORM
6
ISOLATOR
TTL LEVEL
PWM
WAVEFORMS
6
FAST
SHUTDOWN
SA828
DATA/ADDRESS BUS 8
(AD0-AD7)
MICROPROCESSOR
OR
MICROCONTROLLER
WITH ON-CHIP
ROM AND RAM
OPTIONAL
EXTERNAL
RAM
OPTIONAL
EXTERNAL
ROM
Fig. 19 A typical SA828 application
11

11 Page







PáginasTotal 14 Páginas
PDF Descargar[ Datasheet SA8382IG.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
SA8382IGThree-Phase PWM Waveform GeneratorMitel Networks Corporation
Mitel Networks Corporation

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar