IC-MHM Datasheet, PDF (51/63 Pages) IC-Haus GmbH – 14-BIT ABSOLUTE ANGLE HALL ENCODER

iC-MHM
14-BIT ABSOLUTE ANGLE HALL ENCODER
Rev D1, Page 51/63
zeros it receives on MISO before receiving the 1 back.
The number of zeroes preceding the returned 1 is the
number of data channels in the chain.
Figure 38 shows two iC-MHMs in a bussed configura-
tion.
Figure 37: Activate Command For One and Two
Slaves
Each slave outputs two zeros on MISO followed by the
six most significant bits of MOSI and reads its RACTIVE
and PACTIVE bits from bits 1 and 0 respectively of the
RACTIVE/PACTIVE vector on MOSI. In this way, the
RACTIVE/PACTIVE bits for the next slave in the chain
are moved into bits 1 and 0 for the next slave.
Figure 38: Bussing Multiple iC-MHMs
The SPI master can determine the number of data chan- In this configuration, the SPI master communicates with
nels in the chain by sending a 1 as bit 7 after the opcode each iC-MHM individually by activating the appropriate
in the Activate command. It then counts the number of chip select (NCS) output.