IC-MV Datasheet, PDF (13/28 Pages) IC-Haus GmbH – 8-BIT HALL ENCODER

iC-MV 8-BIT HALL ENCODER WITH
CASCADABLE SERIAL INTERFACE
MULTITURN PRINCIPLE
preliminary
Rev B1, Page 13/28
iC-MV can form an absolute measuring system over
several revolutions, through which the number of rev-
olutions is saved in the gear. The singleturn’s drive
shaft activates the first axis in the gear. In the follow-
ing example the transmission ratio between all axes is:
Ratio
=
1
N
.
drive shaft
GEAR N = {32, 16, 8, 4, 2}
1:N
1 turn N turns
1:N
1:N
ratio
1:N
1:N⁴
magnet N S
iC-MV 4
SLO _SSI SLI
SCLK
1:N³
NS
iC-MV 3
SLO _SSI SLI
SCLK
1:N²
NS
iC-MV 2
SLO _SSI SLI
SCLK
1:N¹
NS
iC-MV 1
SLO _SSI SLI
SCLK
1:1
magnetic or optical
sensor system
SINGLETURN
CLOCK
DATA
MTI
Interface
MSB
LSB MSB
LSB
x₄bit position
overlap
x₃bit position
overlap
MSB
x₄
x₂bit position
overlap
MSB
LSB MSB
LSB
x₁bit position
overlap
+
x₃
+
x₂
+
MULTITURN DATA
LSB MSB
LSB
x₁
n bit position
SINGLETURN DATA
Figure 9: General System and Data Display
The iC-MVs connected together in series constitute a
large serial shift register. The entire data length is de-
pendent on the position data length of the individual
iC-MVs and on the number of set error bits, as well as
on the number of iC-MVs existing in the system. The
individual iC-MVs’ position data length is dependent
on the gear axes’ transmission ratio relative to one an-
other. The fourth or last iC-MV in the chain is the first
component to transmit its data.