IC-MH16_15 Datasheet, PDF (22/25 Pages) IC-Haus GmbH – 12-BIT ANGULAR HALL ENCODER

iC-MH16
12-BIT ANGULAR HALL ENCODER
SERIAL INTERFACE: BiSS C protocol
preliminary
Rev A1, Page 22/25
The serial interface operates in BiSS C protocol mode
and enables sensor data to be output in uninterrupt-
ible cycles (data channel SCD). At the same time pa-
rameters can be exchanged via bidirectional register
communication (data channel CD).
The sensor data produced by iC-MH16 contains the bi-
nary coded angle value (ST) with 12 bits, two status bits
(nE and nW) and 6 CRC bits (CRC). In case of lower
resolution the angle data is left aligned and filled-up
with zero. The low-active error bit nE a 0x0 indicates
an error which can be further identified by reading the
status register. The following bit nW corresponds to the
state of the NWARN pad. The status bits are latched,
until readout via single cycle data. The 6 CRC bits are
calculated over ST(11:0), nE and nW with the polynom
0x43, the start value zero and inverted transmitted.
Figure 23: Example line signals (BiSS C)
Single Cycle Data Channel: SCD
Bits
Typ
Label
12
DATA
Angle data ST(11:0) (singleturn
position)
1
ERROR Error bit nE (low active)
1
ERROR Warning bit nW (low active)
6
CRC
Polynomial 0x43
x⁶ + x¹ + x⁰ (inverted bit output)
Table 27: BiSS data channels
CFGTOS
Code
0x0
0x1
ENADAP
0x0
0x1
Notes
Adr 0x7C, bit 0
Clock
Timeout t_tos fclk(MA) min*
19-20
ca. 20 µs
50 kHz
3-4
ca. 3.5 µs
300 kHz
Addr 0x04, bit 4
see CFGTOS
adaptive with
T_CLK
=
1.33
f ()sys
see BiSS
specification
50 kHz
A ref. clock count is equal to f()sys (see El. Char.,
Item No. 501).
Table 29: Timeout configuration
Interface Parameters With BiSS C Protocol
ENSSI
Code
0
1
Addr. 0x05; bit 7
Protocol
Information
BiSS C
SSI
www.biss-interface.com
Table 28: Protocol version
Short BiSS Timeout
If the adaptive timeout is not used, iC-MH16 has a short
BiSS timeout function regardless of register protection
settings according to the description of the BiSS C pro-
tocol (see Page 19, Table 2, El. Char., Item No. 6).
The timeout can be programmed to a shorter value with
the CFGTOS bit. However, this setting is reset to the
default value 20 µs again following a reset.
Register Communication
iC-MH16 uses standard BiSS C register mapping with
one bank for addresses 0x00 to 0x3F; Bank select is
not implemented.