IC-TW14 Datasheet, PDF (20/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
Rev A1, Page 20/33
(4), RESET (7), RESYNC (8), or CLEAR (9) command
is complete, MODE/CMD is set to NORMAL (0) by the
iC-TW14.
The DIAG1 command (1) initiates Diagnostic Mode 1,
which is used to measure the Wiegand pulse angle,
voltage, and magnetic field strength when a Wiegand
pulse occurs. With diagnostic mode 1 active, the Hall
sensor magnetic field level and the Wiegand pulse an-
gle are returned via the UART whenever a Wiegand
pulse occurs. See DIAGNOSTIC MODES on page 26
for information on using diagnostic mode 1.
To terminate diagnostic mode 1, re-synchronize the
iC-TW14 to the iC-PMX by writing 8 to MODE/CMD.
The DIAG2P (2) and DIAG2N (3) commands initiate Di-
agnostic Mode 2, which is used to analyze current ramp
operation. Initiate diagnostic mode 2 by writing 2 (for
a positive ramp) or 3 (for a negative ramp) to MODE/-
CMD. In diagnostic mode 2, the WI and PMXBIAS
values are first written to the iC-PMX, the specified
current ramp is initiated, and the Wiegand pulse time,
current ramp duration time, and peak pulse voltage
are measured (Wiegand pulse voltage is set to zero if
no pulse occurs). These values are then available in
the DIAG2_TIME (0x80), DIAG2_RAMP (0x81), and
DIAG2_VWP (0x82) registers respectively. When the
ramp is finished, MODE/CMD is set to NORMAL (0) by
the iC-TW14. See DIAGNOSTIC MODES on page 26
for information on using diagnostic mode 2.
Diagnostic mode 2 sets STATUS.STOP and STA-
TUS.NOSSI. To clear this condition, re-synchronize the
iC-TW14 using the RESYNC command (8).
The WRITE command (4) writes the values of the
iC-TW14 configuration parameters (R/W/F access reg-
isters) to FRAM using FRAM feedthrough mode in the
iC-PMX. See FRAM Access in the iC-PMX datasheet
and Table 7 for more information.
The READ command (5) reads the stored iC-TW14 con-
figuration parameter values from FRAM using FRAM
feedthrough mode in the iC-PMX and updates the
R/W/F access registers. See FRAM Access in the
iC-PMX datasheet and Table 7 for more information.
The CLEAR command (9) is used to clear the read-only
HALLx_MIN andHALLx_MAX registers. When this com-
mand is executed, the value of all 8 min/max registers
is set to zero.
Commands 21 – 25 provide direct access to the FRAM
connected to the iC-PMX. See DIRECT FRAM AC-
CESS on page 28 for more information on these com-
mands.
The MRDY_LO command (30) sets the MRDY pin of
the iC-TW14 low. This indicates to the external single-
turn sensor that the iC-TW14 is not ready. MRDY_LO
also sets STATUS.STOP.
The MRDY_HI command (31) sets the MRDY pin of
the iC-TW14 high and also sets STATUS.STOP. This
command is for diagnostic use only and does not indi-
cate that the iC-TW14 is ready to supply its absolute
position.
SSI_TEST mode (40) is used to test the SSI multiturn
interface by supplying a static value for transmission.
See DIAGNOSTIC MODES on page 26 for more infor-
mation. To terminate SSI_TEST mode, re-synchronize
the iC-TW14 to the iC-PMX using the RESYNC com-
mand (8).
FRAM_BLOCK
FRAM_BLOCK is a read/write register used with com-
mands 21 – 25 for direct FRAM access . See MODE/-
CMD on page 19 and DIRECT FRAM ACCESS on
page 28 for more information.
DATA Registers
DATA.0 – DATA.3 are read/write registers used with
commands 21 – 25 for direct FRAM access. See
MODE/CMD on page 19 and DIRECT FRAM ACCESS
on page 28 for more information.
In SSI_TEST mode (MODE/CMD = 40), DATA.0 and
DATA.1 contain the LSW and MSW (respectively) of
the 32-bit SSI data used to test the SSI interface.
Value
0 – 65,535
DATA.0 (0x32)
Description
SSI_TEST mode data least significant word
The RESET command (7) is used to reset the iC-TW14.
This is equivalent to when power is applied at startup.
The RESYNC command (8) is used to re-synchronize
the iC-TW14 to the iC-PMX. This is equivalent to the
RESET command except that the iC-TW14 configura-
tion parameters are not re-loaded from FRAM.
Table 32: DATA.0 Register in SSI_TEST Mode
Value
0 – 65,535
DATA.1 (0x33)
Description
SSI_TEST mode data most significant word
Table 33: DATA.1 Register in SSI_TEST Mode