iC-MR 13-BIT S&H SIN/COS
INTERPOLATOR WITH CONTROLLER INTERFACES
Rev A1, Page 28/44
Acquiring position data
able to both the parallel and serial interfaces with SSI
There are three different operating modes for acquiring and BiSS C protocol.
position data which are selected by ACQMODE.
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).
ACQMODE
Addr. 0x19; bit 7...6
Function
R/W
Code
00
Normal conversion with processing time
Pipeline conversion without processing time
01
10
Continuous conversion without processing time
11
Continuous conversion with
interpolated interim values *
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.
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.
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.
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-
NL (Enable Acquire Function)
Function
Convert as soon as the interpolator is free
Do not convert
Level
1
0
Table 44: Special Function of Pin NL
ICHAUS [ IC-HAUS GMBH ]
