IC-MB4_15 Datasheet, PDF (25/40 Pages) IC-Haus GmbH – BiSS INTERFACE MASTER

iC-MB4
BiSS INTERFACE MASTER
preliminary
Rev B2, Page 25/40
Example: BiSS Sensor Bus with 3 Slaves
The following example indicates the sensor data posi-
tion and content in the sensor data of three slaves.
Slave 1: 19+2 bits of sensor data, 6 bits of CRC
=> total length of 27 bits
Slave 2: 12+2 bits of sensor data, 6 bits of CRC
=> total length of 20 bits
Slave 3: 13+2 bits of sensor data, 6 bits of CRC
=> total length of 21 bits
Addr.
Content
0x00 . . 0x07 Sensor data 1(63:0)
0x00
Sensor data 1(7:0)
0x01
Sensor data 1(15:8)
0x02
Sensor data 1(20:16) in bit 4:0
0x03
not changed
0x04
not changed
0x05
not changed
0x06
not changed
0x07
Received CRC of sensor data 1(5:0) in
bit 7:2
0x08 . . . 0x0F Sensor data 2(63:0)
0x08
Sensor data 2(7:0)
0x09
Sensor data 2(13:8) in bit 5:0
0x0A
not changed
0x0B
not changed
0x0C
not changed
0x0D
not changed
0x0E
not changed
0x0F
Received CRC of sensor data 2(5:0) in
bit 7:2
0x10 . . . 0x17 Sensor data 3(63:0)
0x10
Sensor data 3(7:0)
0x11
Sensor data 3(14:8) in bit 6:0
0x12
Sensor data
0x13
not changed
0x14
not changed
0x15
not changed
0x16
not changed
0x17
Received CRC of sensor data 3(5:0) in
bit 7:2
0x18 . . . 0x1F not changed
0x20 . . . 0x27 not changed
0x28 . . . 0x2F not changed
0x30 . . . 0x37 not changed
0x38 . . . 0x3F not changed
Dual SPI Interface Operation
iC-MB4 can be operated with two SPI interfaces on
a single BiSS interface. With activated second SPI
(NWR_E = 0) the SCDATA range is splitted into two
sections, each SPI with 4 SCD data section. The SPI2
can only access the related SCDATA. The SPI2 has no
access to the configuration nor status information.
Addr.
Content
0x00
SPI1: SCDATA 1(7:0)
0x01
SPI1: SCDATA 1(15:8)
0x02
SPI1: SCDATA 1(23:16)
0x03
SPI1: SCDATA 1(31:24)
0x04
SPI1: SCDATA 1(39:32)
0x05
SPI1: SCDATA 1(47:40)
0x06
SPI1: SCDATA 1(55:48)
0x07
SPI1: SCDATA 1(63:56)
0x08 . . . 0x0F SPI1: SCDATA 2(63:0)
0x10 . . . 0x17 SPI1: SCDATA 3(63:0)
0x18 . . . 0x1F SPI1: SCDATA 4(63:0)
0x20 . . . 0x27 SPI2: SCDATA 1(63:0)
0x28 . . . 0x2F SPI2: SCDATA 2(63:0)
0x30 . . . 0x37 SPI2: SCDATA 3(63:0)
0x38 . . . 0x3F SPI2: SCDATA 4(63:0)
Table 16: Address mapping of sensor data access by
SPI1 and SPI2
The second BiSS interface channel 2 is only
available with iC-MB4 QFN28.
Table 15: Address mapping of sensor data