iC-NQ
13-bit Sin/D CONVERTER WITH CALIBRATION
Rev D1, Page 20/25
Sensor Data Communication
The sensor data produced by iC-NQ contains 3 to 13
bits of angle value (S), the period counter (P) with up
to 24 bits (optional), 2 bits of error messages (E1, E0),
and 5 CRC bits (C). Here, M2S sets the output enable
for the position counter; the counter bits, with the MSB
leading, are transmitted in front of the angle value.
Figure 19: BiSS B protocol
The 5 bit CRC output is based on the polynomial 0x25
(100101b), the 6 bit CRC output on the polynomial
0x43 (1000011b) and comes active with longer SCD
data. Generally, CRC bits are output inverted.
As soon as the storage of sensor data is initiated Latch
conversion is paused for one MA clock cycle. This time
Figure 20: BiSS C protocol transparency, no inter-
pretation of CDM
must be taken into consideration when calculating the
maximum input frequency. The synchronization output
at Z (CFGZ = 0x02) is stored until the start bit of the
previous slave arrives.
Register Data Communication
SCD: Angle data
Bits
Type
Label
For as long as the configuration error is active the
longest timeout is used for the register mode inde-
pendent of CFGTOR. Thus when configuring via BiSS
CFGTOR and RPL should be written before address 0.
13
DATA
Angle Data S(12:0)
Error bits E1, E0
Polynomial 0x25
2
ERROR
CRC
5
1
Zero bit
Config.
SELRES = 0x03, M2S = 0x00
A write access at Address 0 triggers an internal reset.
This allows the period counter to be set to zero and
configuration errors to be reset; the EEPROM is not
read out a second time.
Table 35: Format example 1
SCD: Angle data with 8-bit period counter
Register access via BiSS can be limited using the pro-
gramming bits RPL according to the following table.
Bits
Typ
Label
8
DATA
DATA
ERROR
CRC
Period Counter S(7:0)
Angle Data S(12:0)
Error Bits E1, E0
Polynomial 0x25
13
RPL
Adr 0x03, Bit 3:2
2
RPL
Configuration
Address 0-31
User
Address
32-119
BiSS Identifier
Address 120-127
5
1
Zero bit
Config.
SELRES = 0x03, M2S = 0x01
0x00
0x01
0x02
0x03
Read / Write
Read /
Write
Read / Write
Read
Table 36: Format example 2
Read
Read /
Write
-
-
Read /
Write
Read
Read
Read
Table 37: Register Access Safety Level
ICHAUS [ IC-HAUS GMBH ]
