IC-MR Datasheet, PDF (28/44 Pages) IC-Haus GmbH – 13-BIT S&H SIN/COS INTERPOLATOR WITH CONTROLLER INTERFACES

iC-MR 13-BIT S&H SIN/COS
preliminary
INTERPOLATOR WITH CONTROLLER INTERFACES
Rev A1, Page 28/44
Acquiring position data
There are three different operating modes for acquiring
position data which are selected by ACQMODE.
ACQMODE
Addr. 0x19; bit 7...6
R/W
Code
Function
00
Normal conversion with processing time
01
Pipeline conversion without processing time
10
Continuous conversion without processing time
11
Continuous conversion with
interpolated interim values *
Note
*) Only for serial interface with SSI protocol
Table 43: Position data acquisition
In normal converter mode, new data is generated for
each request for position data and this only output at
the end of conversion.
In pipeline mode data is also generated on each re-
quest; however, with each new request the data from
the last conversion is output in order to hide the pro-
cessing time. In this mode the PDV bit is set stati-
cally in the status byte; the ERR_IPO bit in the error
byte, however, continues to signal the status or pro-
cessing time of the interpolator. Pipeline mode is avail-
able to both the parallel and serial interfaces with SSI
and BiSS C protocol.
In continuous conversion mode position data is gen-
erated continuously regardless of external requests
for position data. The data output is the last data to
be converted (the processing time is therefore also
hidden; the exact moment of conversion remains un-
known, however).
In continuous conversion mode with interpolated inter-
mediate data, interpolated position data is output at all
times (as opposed to the last data converted). This
conversion mode is only available to the serial inter-
face with SSI protocol, as no waiting period is possible
in SSI protocol.
If a continuous conversion mode is active (ACQ-
MODE = 10 or 11), conversion can be temporarily in-
terrupted by pin NL using the enable acquire function.
Level
1
0
NL (Enable Acquire Function)
Function
Convert as soon as the interpolator is free
Do not convert
Table 44: Special Function of Pin NL