IC-MHM Datasheet, PDF (39/63 Pages) IC-Haus GmbH – 14-BIT ABSOLUTE ANGLE HALL ENCODER

iC-MHM
14-BIT ABSOLUTE ANGLE HALL ENCODER
Rev D1, Page 39/63
second rising edge) of each BiSS frame and calculates
an adaptive timeout value of
4
T _CLK = _{3 ∗ fsys}
Where fsys is the system clock frequency (refer to Elec.
Char. item no. 501 and 904).
Timeout
t_out
Condition
T_CLK ≤ 1.5 ∗ T_MA
T_CLK ≥ 1.5 ∗ T_MA
Min.
1.5 ∗ T_MA
1.0 ∗ T_CLK
Max.
1.5 ∗ T_MA +
3.0 ∗ T_CLK
1.5 ∗ T_MA +
3.0 ∗ T_CLK
For more information on the BiSS adaptive time-
out, refer to BiSS application note AN23 at
www.biss-interface.com.
BiSS Control Communication
The control Communication uses the CDM and CDS
bits of several consecutives BiSS frames for protected
reading and writing of the register of a slave and the
protected and confirmed sending of commands to se-
lected or all slaves. The CDS bit is transmitted after
the start bit at SLO and the CDM is transmitted as the
inverse of the MA level during the BiSS timeout.
Table 69: Adaptive Adaptive Timeout Calculations
Figure 22: BiSS Protocol Showing Control Communication
The iC-MHM implements various BiSS commands.
BiSS Commands
CMD
Broadcast
Addressed
Condition
0 Deactivate SCD
Activate SCD
ENCMD01 = 1
1 Activate Control Communication Deactivate Control Communication ENCMD01 = 1
2 BiSS Discrete Output Low
BiSS Discrete Output High
ENCMD2 = 1
3 Preset
Preset
ENCMD3 = 1
Table 70: BiSS Commands
The BiSS commands 0 and 1 are required for bus es- BiSS command with CMD = 2 sets P3 high. A BiSS
tablishment and can be enabled with ENCMD01 = 1. broadcast command with CMD = 2 resets P3 low.
ENCMD01
Value
0
1
Addr. 0x0B; bit 6
Function
BiSS Commands 0 and 1 disabled
BiSS Commands 0 and 1 enabled
Table 71: BiSS Command 01 Enable
If the MCL output is configured as a BiSS command
controlled output (SBL_MTI = 0, CFG_IOP = 2 or 3,
and ENCMD2 = 1, an addressed BiSS command with
CMD = 2 sets MCL high. A BiSS broadcast command
with CMD = 2 resets MCL low.
Refer to DIGITAL I/O PORT on page 26 for more in-
If P3 is configured as a BiSS command controlled out- formation on defining the BiSS command controlled
put (CFG_IOP = 0 and ENCMD2 = 1), an addressed output.