IC-TW11 Datasheet, PDF (15/25 Pages) IC-Haus GmbH – 10-BIT ULTRA LOW POWER MAGNETIC ABSOLUTE ROTARY ENCODER

iC-TW11 10-BIT ULTRA LOW POWER^preliminary
MAGNETIC ABSOLUTE ROTARY ENCODER
Rev B1, Page 15/25
COS Register
Bit
Name
15
busy
14
warn
13:12
-
11:0
cosine
Addr. 0x02
Description
Busy; cosine is undefined
Conversion warning
Reserved (0)
12-bit cosine of angle
Table 11: COS Register
COS.cosine is returned as a signed 2’s complement
value in the range ±1533 (±0x5FD). The magnitude of
COS.cosine depends on the strength of the magnetic
field and the gain in use when the sample was taken.
The busy bit, busy (bit 15) indicates whether or not a
conversion is in process. If COS.busy = 0, the conver-
sion is complete and COS.cosine is valid. If COS.busy =
1, the conversion is in process and COS.cosine is un-
defined.
The conversion warning bit, warn (bit 14) shows
whether an ADC over- or underflow occurred during
the conversion. If COS.warn = 0, no over-or underflow
occurred. If COS.warn = 1, an ADC over- or underflow
occurred. See ANGLE register for more information.
The busy bit, busy (bit 15) indicates whether or not a
conversion is in process. If busy = 0, the conversion
is complete and the Hall data is valid. If busy = 1, the
conversion is in process and the Hall data is undefined.
The conversion warning bit, warn (bit 14) shows
whether an ADC over- or underflow occurred during
the conversion. If warn = 0, no over-or underflow oc-
curred. If warn = 1, an ADC over- or underflow occurred.
See ANGLE register for more information.
DEVICE Register
The DEVICE register is an 8-bit read-only register that
contains identifying information about the device.
The DEVICE Register value is returned in the lower
byte of the Response packet.
DEVICE Register
Bit
Name
7:4
rev
3:0
id
Addr. 0x20
Description
Chip Revision
Current: rev = 6 for iC-TW11 Z
Chip Identification (11, 0xB)
Table 13: DEVICE Register
HALL Registers
The three HALL registers (HALL0, HALL120, and
HALL240) are 16-bit read-only registers that contain
the sampled signal amplitude of the three Hall sensors
used to calculate the most recently converted angular
position of the magnet.
When reading the HALL registers, it is recommended to
suppress the next sample by setting sup = 1 in the com-
mand packet. This ensures that the values read are
consistent with the angle calculated from the previous
(most recent) sample.
HALL Registers
HALL0
HALL120
HALL240
Bit
Name
15
busy
14
warn
13:10
-
9:0
hall
Addr. 0x03
Addr. 0x04
Addr. 0x05
Description
Busy; Hall data undefined
Conversion warning
Reserved (0)
10-bit Hall signal amplitude
Table 12: HALL Registers
The Hall signal amplitudes are returned as signed 2’s
complement values in the range of ±511 (±0x1FF). The
actual magnitude of the Hall signals depends on the
strength of the magnetic field and the gain in use when
the sensors were sampled.
CONFIG Register
The CONFIG register is an 8-bit read/write register that
can be used to configure the iC-TW11.
When writing the CONFIG register, it is recommended
to suppress the next sample by setting sup = 1 in the
command packet to avoid sampling with an undefined
configuration. When reading the CONFIG register, the
value is returned in the lower byte of the response
packet.
CONFIG Register
Bit
Name
7
-
6
spol
5
smod
4
-
3
imod
2
noagc
1
-
0
lpwr
Addr. 0x21
Description
Reserved (must be 0)
Sample input polarity
Sampling mode
Reserved (must be 0)
Interrupt request (IRQ) Mode
AGC disable
Reserved (must be 0)
Low power mode
Table 14: CONFIG Register
The default value of the CONFIG register at power-up
is 0x00.
The sample input polarity bit, spol (bit 6) determines
which edge of the SAMPLE input is used to sample the
Hall array and do a new conversion.