IC-MU_13 Datasheet, PDF (56/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
POSITION OFFSET VALUES AND PRESET FUNCTION
Rev B1, Page 56/59
MODE_MT
MSB
MT
LSB MSB
MT MPC
MPC
LSB
MPC
upper 12 bit of master track
MSB
MAS
LSB+2
MAS
OFF_ABZ
ADR 0x27
bit 7
PRES_POS ADR 0x2E
bit 7
ADR 0x25
bit 0
ADR 0x2C
bit 0
ADR 0x24
bit 7
ADR 0x2B
bit 7
ADR 0x23
bit 4
ADR 0x2A
bit 4
Figure 47: Position of the parameters OFF_ABZ and PRES_POS with respect to configured multiturn
(MODE_MT), periods (MPC) and converter resolution
OFF_ABZ holds the position offset values stored
in the EEPROM. After startup or the commands
SOFT_RESET and ABS_RESET the OFF_ABZ val-
ues are amended to include the nonius data and the
multiturn data (in case an external multiturn is config-
ured) and stored as OFF_POS in the internal RAM.
For output the OFF_POS value is subtracted with each
conversion from the internally synchronized result.
OFF_ABZ(3:0) Addr. 0x23; bit 7:4
OFF_ABZ(11:4) Addr. 0x24; bit 7:0
OFF_ABZ(19:12) Addr. 0x25; bit 7:0
OFF_ABZ(27:20) Addr. 0x26; bit 7:0
OFF_ABZ(35:28) Addr. 0x27; bit 7:0
OFF_ABZ(3:0)
Addr. SER:0x1E; bit 7:4
OFF_ABZ(11:4) Addr. SER:0x1F; bit 7:0
OFF_ABZ(19:12) Addr. SER:0x48; bit 7:0
OFF_ABZ(27:20) Addr. SER:0x49; bit 7:0
OFF_ABZ(35:28) Addr. SER:0x4A; bit 7:0
Code
Description
Bank0
Bank0
0x000000000
...
Offset position relative to absolute position
0xFFFFFFFFF
Table 107: Output offset position, relative to absolute
position
OFF_POS(19:12) Addr. SER:0x20; bit 7:0
OFF_POS(27:20) Addr. SER:0x21; bit 7:0
OFF_POS(35:28) Addr. SER:0x22; bit 7:0
Code
Description
0x000000000
...
Offset (is automatically computed)
0xFFFFFFFFF
Bank0, R
Bank0, R
Bank0, R
Table 108: Output position offset amended by the no-
nius/MT
Preset function
The preset function corrects the output position value
of the ABZ, SPI, or BiSS interface to the setpoint given
by PRES_POS. Correction is initiated by writing com-
mand SOFT_PRES or SOFT_E2P_PRES to the com-
mand register (see page 52), or, if one of these com-
mands is configured with PA0_CONF as NPRES com-
mand at PA0 pin, by a falling edge at NPRES. See
Table 28 for configuration of NPRES and Table 106 for
PA0_CONF.
When the preset function is started, the ABZ converter
is stopped. The current position is then determined.
The correction factor for output (OFF_POS) is calcu-
lated taking PRES_POS into account and stored in
the internal RAM. Offset values OFF_ABZ are com-
puted and if the command SOFT_E2P_PRES is used
written to the external EEPROM. The ABZ converter is
then restarted.
PRES_POS(3:0)
Addr. 0x2A; bit 7:4
PRES_POS(11:4) Addr. 0x2B; bit 7:0
PRES_POS(19:12) Addr. 0x2C; bit 7:0
PRES_POS(27:20) Addr. 0x2D; bit 7:0
PRES_POS(35:28) Addr. 0x2E; bit 7:0
PRES_POS(3:0)
Addr. SER:0x4D; bit 7:4
PRES_POS(11:4) Addr. SER:0x4E; bit 7:0
PRES_POS(19:12) Addr. SER:0x4F; bit 7:0
PRES_POS(27:20) Addr. SER:0x50; bit 7:0
PRES_POS(35:28) Addr. SER:0x51; bit 7:0
Code
Description
0x000000000
...
Preset position
0xFFFFFFFFF
Table 109: Output position preset