IC-MA3 Datasheet, PDF (11/19 Pages) IC-Haus GmbH – ANGULAR HALL SENSOR

iC-MA3 ANGULAR HALL SENSOR
WITH SIN/COS OUTPUT, CASCADABLE
SINGLE-CHIP OPERATION and OUTPUT SIGNALS
Rev A2, Page 11/19
In single-chip operation, the pins P0 to P3 are config-
ured as outputs for the sine and cosine signals. Two
output modes are available: single-ended output (Fig-
ure 4), and differential output (Figure 5).
the magnet’s field is to be calculated by the ratio of the
sine and cosine signals. By taking the signal’s polarity
into account, the angle is distinct over a full turn of the
axis.
Single-ended output
The measurement is performed single-ended using a
reference voltage. The sine signal is available at pin P1,
the cosine signal at pin P2, and their reference voltage
at pin P0.
Additionally, the gain signal of the amplitude control can
be monitored at pin P3 (refer to SENSOR MONITOR-
ING, Page 15, for description).
Vout()pk PSIN PCOS
VREF
P0
~
VDD
2
VREF
PSIN
P1
0°
360°
720° _a
PCOS
P2
GAIN
~
VDD
2
P3
VREF
GAIN
depending on
magnetic strength
0°
360°
720° _a
Figure 4: Single-chip operation with single-ended
output of sine/cosine (PSIN, PCOS), with
reference (VREF) and gain signal (GAIN).
The sin/cos signal amplitude Vout()pk refers to the ref-
erence voltage Vref, which is approximately half the
supply voltage. This means a pin’s output signal varies
in the range of Vref ± Vout()pk.
For single-ended output, the measurement signal is
± Vout()pk, and doubles with differential output to
± 2 x Vout()pk. In both cases, the axis angle applied by
Note that three different output levels are selectable
by pin ASEL (see Table 7), allowing the adaption of
iC-MA3 to the evaluating system.
Differential output
The differential output features the advantage of a dou-
bled amplitude compared to single-ended. A positive-
and a negative-going sine signal is available at pins
P1 and P0, respectively, a positive- and negative-going
cosine signal at pins P2 and P3.
Vout()pk PSIN PCOS
NSIN
P0
~
VDD
2
PSIN
P1
0°
360°
720° _a
PCOS
P2
NCOS
NSIN
NCOS
~
VDD
2
P3
0°
360°
720° _a
Figure 5: Single-chip operation with differential out-
put of sine (PSIN, NSIN) and cosine
(PCOS, NCOS).
Activation
The voltage at enable input NEN must first undershoot
its low threshold to activate the mode configured by M0
and M1. Due to the IC’s amplitude control settling, the
output signals require some time to reach the preset
level (refer to ts()ctrl, Elec. Char. No. 201).