IC-NG Datasheet, PDF (2/21 Pages) IC-Haus GmbH – 8-BIT Sin/D CONVERTER-PROCESSOR

iC-NG
8-BIT Sin/D CONVERTER-PROCESSOR
Rev D3, Page 2/21
DESCRIPTION
iC-NG is a monolithic A/D converter which determines
the angle value of two sinusoidal input signals phase-
shifted at 90° with a given resolution and hysteresis. In
this process a cycle is divided into 8 segments; each
of these segments can be given a resolution of up to
32 angular steps. Resolutions of 1 to 256 divisions per
cycle are possible.
The converter can be adjusted for each individual
segment to suit various types of input signal, meaning
that even distorted sine signals or triangular signals,
for example, can be converted. In addition, the direc-
tion of rotation can be inverted and the zero position
can be set in steps of 45°.
When programmed as an output, pin MFP shows the
change in output value or indicates when a certain
position has been reached (interrupt output). After a
reset, the interpolation result is correct after just a few
clock cycles, even with static input signals.
If incremental mode is selected, the changes in angle
are output as square-wave signals phase-shifted at
90° at pins D0(AX) and D1(BX) with a selected resolu-
tion and at pins D3(A4) and D4(B4) with a resolution of
four. The suitably prepared zero signal is at D2(ZX)
and D5(Z4). Pin D6(ROT) shows the direction of rota-
tion. Tracks AX and BX are EX-OR-gated at pin
D7(AXB).
Output values and parameters are stored in registers
connected to the internal 8-bit data bus. A parallel
microcontroller interface gives read and write access
to these registers. If an EEPROM is connected to the
serial interface, the chip setup can be automatically
read in following a reset.
The output value consists of an 8-bit word for interpo-
lation within a cycle and a 24-bit position counter
which logs the number of turns. In addition to normal
accessibility, the output value can also be transferred
serially.
The position counter can be reset via the zero pulse or
stopped and started using the bi-directional MFP pin.
The front-end amplifier connections are all lead out,
enabling current or voltage inputs to be made. Com-
plementary input signals can also be connected. The
front-end amplifiers are compensated internally; the
value of compensation can be programmed.
The internal clock frequency can be adjusted using an
external resistor or can be fed in via pin RCLK. The
clock pulses which occur between two changes in
output are counted in order to calculate the number of
revolutions. Low voltage and excessive input
frequency errors are signaled at output NER (open
drain). These error codes are stored in the relevant
register.