IC-MA3 Datasheet, PDF (2/19 Pages) IC-Haus GmbH – ANGULAR HALL SENSOR

iC-MA3 ANGULAR HALL SENSOR
WITH SIN/COS OUTPUT, CASCADABLE
Rev A2, Page 2/19
DESCRIPTION
The magnetic angle sensor iC-MA3 is easily config-
ured by pins and runs off a single 3 V to 5.5 V supply.
The device outputs conditioned sine/cosine signals
representing the axis angle, introduced by a diametric
permanent magnet facing the package.
The signal bandwidth can be lowered to 5 kHz or
500 Hz by pin configuration, to cut noise and improve
the measurement precision. Furthermore, the Hall
sensors’ sampling rate can be reduced to lower the
power consumption of the device.
An array of four Hall sensors is used for the differen-
tial scanning of the magnetic field, whereas unwanted
external stray fields are nearly compensated, and
thus not detected. Besides, a high lateral mechan-
ical placement tolerance is obtained easing device
installation.
The sine/cosine signals can be output either sin-
gle-ended or differential, with a pin-configured am-
plitude controlled to 0.25 V, 0.5 V or 1 V. At full signal
bandwidth of 10 kHz, iC-MA3 can track the magnet
rotation at up to 60,000 rpm.
The analog gain signal is output to pin GAIN and in-
dicates the magnet-to-sensor operating distance. At
an excessive distance, the GAIN signal saturates and
open-drain output NERR indicates the loss-of-magnet
failure by a low signal.
Multiple iC-MA3 devices can be cascaded to sense
several rotary axes, one at a time, but sharing a com-
mon analog signal bus to report the angle positions.
CONTENTS
PACKAGING INFORMATION
PIN CONFIGURATION . . . . . . . . . . . .
PACKAGE DIMENSIONS . . . . . . . . . . .
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS
3 SINGLE-CHIP OPERATION and OUTPUT
3
SIGNALS
11
4
MULTI-CHIP CHAIN OPERATION
12
5
Line signals . . . . . . . . . . . . . . . . . . . 12
Line timing . . . . . . . . . . . . . . . . . . . 13
5
POWER SAVING OPERATION
14
6
Example . . . . . . . . . . . . . . . . . . . . 14
HALL SENSORS
8
SPEED SETTING (Integration Time)
15
Principle of operation . . . . . . . . . . . . . 8
Hall sensor array and zero angle . . . . . . . 8 _{SENSOR MONITORING}
15
MODE CONTROL
9
Operation modes . . . . . . . . . . . . . . . . 9
Changing the operation mode . . . . . . . . . 9
Monitoring by output GAIN . . . . . . . . . . 15
Signal examples for output GAIN . . . . . . . 16
Monitoring by output NERR . . . . . . . . . . 16
Power saving modes . . . . . . . . . . . . . . 9 _{STEP-UP CONVERTER}
16
Speed setting (integration time) . . . . . . . . 9
Output level setting . . . . . . . . . . . . . . . 10 _{APPLICATION CIRCUITS}
17
Standby . . . . . . . . . . . . . . . . . . . . . 10
Test Mode . . . . . . . . . . . . . . . . . . . . 10 REVISION HISTORY
17