IC-TW14 Datasheet, PDF (22/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
Rev A1, Page 22/33
GAIN
GAIN is a read-only register containing the current
GAIN value in the iC-PMX.
Value
0–7
8 – 65,535
GAIN (0x49)
Description
Current iC-PMX Hall amplifier gain
Reserved (not used)
Table 39: GAIN Register
The GAIN value is changed by the iC-TW14 as required
by application conditions when AUTO_GAIN = 1. See
AUTO_GAIN on page 18 for more information.
HALLx_MIN and HALLx_MAX Registers
The iC-TW14 provides 8 read-only registers that pro-
vide the minimum and maximum magnetic field strength
from the four iC-PMX singleturn Hall sensors since pow-
er-up or the last RESET (7) or CLEAR (9) command.
Value
±32,767
HALLx_MIN/MAX (0x4A – 0x51)
Description
iC-PMX singleturn Hall magnetic field strength
in units of 0.1 kA/m
PMX_ST
PMX_ST is a read-only register containing the single-
turn position (angle) (in degrees) calculated from read-
ing the singleturn Hall sensors in the iC-PMX and cor-
rected to compensate for the offset of the Wiegand
sensor to the iC-PMX.
Value
0 – 359
360 – 65,535
PMX_ST (0x53)
Description
Corrected singleturn angle
Reserved (not used)
Table 42: PMX_ST Register
PMX_ST is calculated as
PMX _ST = PMX _ANGLE + WOFS
See WOFS on page 16 for more information on the
Wiegand misalignment value WOFS.
PMX_MT
PMX_MT[15:0] is a read-only register which contains
the least significant word of the 32-bit multiturn count.
Table 40: HALLx_MIN/MAX Registers
Bits
These registers are cleared (set to zero) by executing ^15:0
the CLEAR command (9). See MODE/CMD on page
19.
PMX_MT[15:0] (0x54)
Description
Multiturn counter LSW (bits 15:0)
Table 43: PMX_MT[15:0] Register
PMX_ANGLE
PMX_ANGLE is a read-only register containing the sin-
gleturn angle (in degrees) calculated from reading the
singleturn Hall sensors in the iC-PMX.
Value
0 – 359
360 – 65,535
PMX_ANGLE (0x52)
Description
iC-PMX singleturn Hall angle
Reserved (not used)
Table 41: PMX_ANGLE Register
PMX_ANGLE is calculated from SIN and COS.
PMX_MT[31:16] is a read-only register which contains
the most significant word of the 32-bit multiturn count.
PMX_MT[31:16] (0x55)
Bits
Description
15:0
Multiturn counter MSW (bits 31:16)
Table 44: PMX_MT[31:16] Register
At startup, the multiturn count is read via the iC-PMX
from FRAM addresses 0x000 – 0x005 and bits 31:0 are
used to initialize the multiturn counter in the iC-TW14.
Bits 15:0 are available in PMX_MT[15:0] and bits 31:16
are available in PMX_MT[31:16].
During operation, PMX_MT is updated by counting
PMX_ST revolutions. After each update, PMX_MT[5:0]
is compared to iC-PMX POS[5:0], and STATUS.MTF
is set if a multiturn fault is detected. See STATUS on
page 14 and Position Data in Period Counter Mode with
a Data Processing FRAM in the iC-PMX datasheet for
more information.