IC-NQ Datasheet, PDF (20/25 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH CALIBRATION

iC-NQ
13-bit Sin/D CONVERTER WITH CALIBRATION
Sensor Data Communication
Rev D1, Page 20/25
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
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.
Figure 20: BiSS C protocol transparency, no inter-
pretation of CDM
Register Data Communication
SCD: Angle data
Bits
Type
Label
13
DATA
Angle Data S(12:0)
2
ERROR Error bits E1, E0
5
CRC
Polynomial 0x25
1
Zero bit
Config.
SELRES = 0x03, M2S = 0x00
Table 35: Format example 1
SCD: Angle data with 8-bit period counter
Bits
Typ
Label
8
DATA
Period Counter S(7:0)
13
DATA
Angle Data S(12:0)
2
ERROR Error Bits E1, E0
5
CRC
Polynomial 0x25
1
Zero bit
Config.
SELRES = 0x03, M2S = 0x01
Table 36: Format example 2
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.
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.
Register access via BiSS can be limited using the pro-
gramming bits RPL according to the following table.
RPL
RPL
0x00
0x01
0x02
0x03
Adr 0x03, Bit 3:2
Configuration
Address 0-31
Read / Write
Read
-
-
User
Address
32-119
Read /
Write
Read /
Write
Read /
Write
Read
BiSS Identifier
Address 120-127
Read / Write
Read
Read
Read
Table 37: Register Access Safety Level