IC-TW14 Datasheet, PDF (16/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
Rev A1, Page 16/33
NRAMP
NRAMP is a read/write register that sets the iC-PMX
ramp parameters used to activate a negative current
ramp.
NRAMP (0x11)
Bits
Description
15:8
Reserved (must be zero)
7:0
iC-PMX RAMP(7:0)
Table 15: NRAMP Register
The LSB of the NRAMP register is written to iC-PMX
address 0x01 when a negative current ramp is re-
quired. See Wiegand Module Excitation in the iC-PMX
datasheet for more information.
PMXBIAS
PMXBIAS is a read/write register used to set the
iC-PMX bias value. The least significant four bits of
the PMXBIAS register are written to iC-PMX address
0x02[7:4] on startup, when diagnostic mode 2 is initi-
ated, when a RESET or RESYNC command is exe-
cuted, or when STATUS.PNR changes from 1 to 0. See
SPI Slave Interface in the iC-PMX datasheet for more
information.
PMXBIAS (0x13)
Bits
Description
15:4
Reserved (must be zero)
3:0
iC-PMX Register 0x02(7:4) (BIAS) value
Table 17: PMXBIAS Register
PMXWI
PMXWI is a read/write register used to set the iC-PMX
WI parameter used to select the switched current ramp
maximum current. The PMXWI register value is written
to iC-PMX address 0x02[1:0] on startup, when diag-
nostic mode 2 is initiated, when a RESET or RESYNC
command is executed, or when STATUS.PNR changes
from 1 to 0. See SPI Slave Interface in the iC-PMX
datasheet for more information.
PMXWI (0x12)
Bits
Description
15:2
Reserved (must be zero)
1:0
iC-PMX Register 0x02(1:0) (WI) Value
Table 16: PMXWI Register
To change the iC-PMX BIAS value, write the desired
value to PMXBIAS, write the configuration to FRAM
using the WRITE command (4), and reset the iC-TW14
using the RESET command (7). On startup, the new
BIAS value is written to the iC-PMX. See Device Cali-
bration and System Diagnosis in the iC-PMX datasheet
for more information on BIAS.
PMXGAIN
PMXGAIN is a read/write register used to set the
iC-PMX singleturn Hall amplifier gain. The gain value is
written to iC-PMX address 0x00[7:5] on startup, when
a RESET or RESYNC command is executed, or when
STATUS.PNR changes from 1 to 0. See SPI Slave
Interface in the iC-PMX datasheet for more information.
To change the WI value in the iC-PMX, write the desired
value to PMXWI, write the configuration to FRAM using
the WRITE command (4), and reset the iC-TW14 using
RESET command (7). On startup, the new PMXWI
value is written to the iC-PMX. See Wiegand Module
Excitation in the iC-PMX datasheet for more information
on WI.
PMXGAIN (0x14)
Bits
Description
15:3
Reserved (must be zero)
2:0
iC-PMX GAIN(2:0)
Table 18: PMXGAIN Register
WOFS
WOFS is a read/write register containing the angular
offset of the Wiegand module to the iC-PMX H0/H2
axis.
Value
0 – 359
360 – 65,535
WOFS (0x15)
Description
Wiegand module offset in degrees
Reserved (do not use)
Table 19: WOFS Register
See WIEGAND OFFSET AND MISALIGNMENT in
iC-PMX Application Note 2 for more information. In
general, the Wiegand module misalignment must be
measured on every unit and then entered into WOFS
to account for production and assembly tolerances.