ADMC201AP Analog Devices Inc, ADMC201AP Datasheet - Page 9

• Manufacturer Part Number: ADMC201AP
• Description: IC MOTION CO-PROC 25MHZ 68PLCC
• Manufacturer: Analog Devices Inc

Specifications of ADMC201AP

• Rohs Status: RoHS non-compliant
• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

REV. B
Reverse Clarke Transformation
The first operation is the Clarke transformation in which the
three-phase motor current signals (I
sine and cosine orthogonal signals (I
represent the equivalent currents in a two-phase ac machine and
is the signal format required for the Park rotation. The three-
phase input signals are of the form:
PHIP1 I
PHIP2 I
PHIP3 I
and the Park rotation requires inputs in the form I
I
This is calculated from:
IY
After the reverse transform, registers I
phase input current information.
In the case where 2- of 3-phase information (PHIP2/3 only) is
provided, then PHIP1 will be derived from the simple fact that
all sum to zero. This value is then placed in the IX register.
IX = I
Reverse Park Rotation
IX/IY are then processed together with the digital angle
(RHO) by a Park rotation. If the input signals are I
then the rotation can be described by:
ID
IQ
where ID and IQ are the outputs of the Park rotation.
Cos
lated internally.
Substituting for I
ID
IQ
Performing a Forward Transformation
In order to perform a forward rotation, write values to the VD
and VQ registers and then initiate the transformation by writing
the rotation angle to the register RHOP. The forward transfor-
mation will only operate correctly when Bit 10 in the SYSCTRL
register is set (i.e., in 3/3 mode).
The forward rotation will be completed in 40 system clock
cycles after the rotation is initiated. If Bit 6 of the system
control register is set, then an interrupt will be generated on
completion. When an interrupt occurs, the user must check Bit
1 of the system status register, SYSSTAT, to determine if the
vector transformation block was the source of the interrupt.
During the vector transformation, the transformation registers
must not be written to or the vector rotation results will be invalid.
s
sin , therefore we need to generate I
I
I
I
I
x
and sin are required for the Park rotation, and are calcu-
d
q
d
q
= I
= –I
= I
= I
= I
I
u
v
w
s
s
sin =
= I
= I
s
= I
x
s
cos = – I
y
cos
sin
s
s
s
cos + I
cos ( + 120)
cos
cos ( + 240)
sin + I
x
and I
1
3
cos
cos + I
s
(I
cos ( + 120) – I
y
y
y
s
in the above yields:
cos ( + 240) – I
x cos
– I
sin
s
s
cos
sin
u
x
, I
sin = I
sin
and I
x
v
s
and I
, I
sin .
s
cos ( + 240)
s
w
y
cos ( +120))
= I
) are converted to
). These signals
y
contain the 2-
s
s
cos ( – )
sin ( – )
s
cos and
x
and I
y
,
–9–
Forward Park Rotation
If the input signals are represented by Vd and Vq, then the
transformation can be described by:
VX
VY
where V
the inputs to the reverse Clarke transformation.
Forward Clarke Transformation (2- to 3-Phase)
The second operation to be applied to the above results, is the
Forward Clarke Transformation where 2-phase (stator) voltage
signals are converted to 3-phase (stator) voltage signals.
For the inverse Clarke transform we require three-phase outputs
of the form below:
PHV1
PHV2
PHV3
We have two quadrature voltages (V cos and V sin ) available.
PHV2
PHV3
PROGRAMMABLE DIGITAL INPUT/OUTPUT PORT
The ADMC201 has a six bit programmable digital I/O port.
Each bit is individually configurable as input or output. All bits
configured as inputs have the ability to operate as interrupt
sources. Each pin is independently capable of generating an in-
terrupt should its input level change.
Configuring the Programmable Digital I/O Port
The PIOCTRL register is used to configure the individual bits
on the programmable digital I/O port as either inputs or outputs
and to enable change of state interrupts. The lower six bits of
PIOCTRL control the direction (either input or output) of the
individual bits. A zero configures the corresponding bit as an
input; conversely a 1 configures the corresponding bit as an out-
put. The upper six bits of PIOCTRL are used to enable the
individual bits for use as change of state interrupt sources. A 0
disables change of state interrupt generation and a 1 enables
change of state interrupt generation. The interrupt enable for a
bit configured as an output is ignored. At power-up or RESET,
all six bits of the digital port are configured as input and change
of state interrupt generation is disabled.
Using the Programmable Digital I/O Port
The PIODATA register is used to write to and read from the
digital I/O port. Bits 0–5 of the PIODATA register correspond
to PIO 0–5 on the ADMC201. Bits 6–11 of PIODATA are un-
used and always contain 0. Read from PIODATA to determine
the state of PIO 0–5. Write to PIODATA to change the states
of PIO 0–5. Writing to bits configured as input has no effect.
Reading from bits configured as output will return the last value
written.
V
V
x
y
x
= V
V cos
V cos ( + 120)
V cos ( + 240)
= V
and V
d
d
V cos ( + 240) =
V cos ( + 120) =
y
cos – V
sin
are the outputs of the Park Rotation, and are
+ V
q
q
cos
sin
–
–
1
2
1
2
V cos – 3
V cos
ADMC201
2
2
3
V sin
V sin