IC-MV Datasheet, PDF (14/28 Pages) IC-Haus GmbH – 8-BIT HALL ENCODER

iC-MV 8-BIT HALL ENCODER WITH
CASCADABLE SERIAL INTERFACE
REGISTERS
preliminary
Rev B1, Page 14/28
OFFSET(7:0): Position Offset
DIR
The content of the offset register is added to the current Code
position. It allows the position data to be adjusted in a 0x0
way that a synchronization of the position data is possi- 0x1
ble. The offset calculation is described in the chapter
Synchronization.
Addr. 0x1; bit 7
Description
Code direction rising at clockwise rotation (CW)
Code direction falling at counterclockwise rotation
(CCW)
Table 7: Code Direction
OFFSET(7:0)
+
Internal
POSITION
POSITION(7:0)
Figure 10: Offset Addition
OFFSET(7:0)
Addr. 0x0; bit 7:0
Code
Description
0x00
0
...
...
0x7F
127
...
...
0xFF
255
Table 6: Position Offset
RNF: Edge of Data Output
In the SSI protocol, position data is usually output at the
pin SLO with the rising clock edge of SCLK. In order
to increase the calculation time for components in the
chain, position data can be output with the falling clock
edge.
SCLK
SLO
RNF = 1
RNF = 0
t
calc
Figure 12: Increasing the Calculation Time
DIR: Code Direction
The bit DIR inverts the position register’s code direction
and has to be inverted for the counter-rotating axes, so
that all iC-MVs have the same code direction.
Chain components are to be configured with RNF = 0x0;
only the last component (iC-MV 4) is to be configured
with RNF = 0x1.
RNF
Code
0x0
0x1
Addr. 0x1; bit 6
Description
falling edge
rising edge
Table 8: Edge of Data Output
CW
CCW
CCW
CW
Figure 11: Code Direction
EMODE(2:0): Error Bit Options
The EMODE indicates how a faulty condition is dis-
played. The configuration of the error bit options should
be identical with all iC-MVs. If EMODE is configured
with 0x01 or 0x03 an error bit is attached to the end of
the position data. Each iC-MV manipulates this error bit
according to its error status. A faulty status is dominant.
With EMODE = 0x07 or 0x05 each iC-MV complements
its own error bit at the end of the sensor data.