IC-MA3 Datasheet, PDF (9/19 Pages) IC-Haus GmbH – ANGULAR HALL SENSOR

iC-MA3 ANGULAR HALL SENSOR
WITH SIN/COS OUTPUT, CASCADABLE
MODE CONTROL
Rev A2, Page 9/19
Operation modes
The pins M0 and M1 are used to choose between sin-
gle-ended and differential measurement and to set sin-
gle-chip operation or chain operation to evaluate multi-
ple devices connected to a bus line.
the pin state of M0 or M1 during operation, it does not
immediately alter the operation mode. To activate the
new pin set, enable input NEN must first be released to
high to disable the IC. After pulling NEN low again, the
new operation mode comes effective.
Changing the operation mode
The operation mode configured by pins M0 and M1 is
stored internally following power-up. So if changing
Note: Changes to pins PSEL, ASEL, and FSEL come
into play immediately after exceeding their debouncing
time (refer to Elec. Char. No. 305).
Mode
M0 M1
Single-chip operation
Single-ended output low low
Differential output
high low
Chain operation
Single-ended output low high
Differential output
high high
Port P0
VREF
NSIN
CLK
CLK
Port P1
Port P2
PSIN
PSIN
PCOS
PCOS
PSIN / VREF PCOS / GAIN
PSIN / NSIN PCOS / NCOS
Port P3
GAIN
NCOS
NENO
NENO
Table 4: Operation modes
Power saving modes
Two power saving modes are selectable by pin PSEL
which reduce the current consumption of iC-MA3. If
selected, the Hall sensors are no longer operated con-
tinuously but only activated periodically for a short time.
On one hand this reduces the IC’s current consump-
tion, on the other hand it decreases the update rate
of the measurements, what reduces the permissible
maximum rotary frequency accordingly.
A power saving mode can be freely combined with any
setting of integration time.
Mode
Full Power
Reduced Power
Eco Power
PSEL
high
low
open
Update Rate
÷1
÷6
÷18
Notes
continuous measurement
Table 5: Power saving modes
Speed setting (integration time)
If the maximum rotary frequency of a system is lower
than the Hall sensors cut-off frequency (refer to Elec.
Char. No. 107), pin FSEL can allow for a longer aver-
aging of measurements reducing signal noise.
Note that the maximum rotary frequency listed in Table
6 refers to full power mode (continuous measurements).
Any setting of integration time can be freely combined
with a power saving mode.
If combining the modes, the permissible maximum ro-
tary frequency scales according to the product of both
factors: factor of Tab. 5 multiplied by factor of Tab. 6.
Mode
Full Speed
Half Speed
Min Speed
FSEL
high
low
open
Max. Rotary Freq.
÷1
÷2
÷20
Notes
normal
halved
minimal
Table 6: Speed setting (integration time)