HMC1022 Honeywell Microelectronics & Precision Sensors, HMC1022 Datasheet - Page 12

• Manufacturer Part Number: HMC1022
• Description: Magnetic Sensor
• Manufacturer: Honeywell Microelectronics & Precision Sensors

Specifications of HMC1022

• Sensitivity Range: 1mV/V/G
• Sensor Output: Voltage
• Terminal Type: PCB Thru Hole
• Output Type: Differential
• Sensor Terminals: SMD Gull Wing
• Leaded Process Compatible: No
• Magnetic Field Max: 6G
• Axis Configuration: Two
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LINEAR MAGNETIC FIELD SENSORS
movement
Simple Circuit Application
The circuit in Figure 16 shows a simple application of a
magnetic sensor. This circuit acts as a proximity sensor
and will turn on the LED when a magnet is brought within
0.25 to 0.5 inch of the sensor. The amplifier acts as a
simple comparator and switches low when the HMC1001
bridge output exceeds 30mV. The magnet must be
magnet
Magnetic
Sensor
Calibrate:
1. Trim R1 for (+V) - (-V) < 30mV
2. Apply signal < 30mV, LED should be off.
3. Apply signal > 30mV, LED should be on.
Figure 16—Magnetic Proximity Switch
(1) Momentarily close switch SW1. This creates a SET pulse. (2) Measure bridge output (OUT+) - (OUT-) NOTE: Bridge
output signal will be 5mV/gauss (3) Measure Vout after AD623 amplifier (G~500) NOTE: Vout signal will be 2.5V/gauss
7
4
8
5
Figure 18—One-Axis Sensor With Constant Bridge Current and Digital Interface
R1*
V+
V-
+5V
22.1K
R3**
3
2
Vref
+5V
7
10K
+
-
tantalum
4.7uF
100K
AMP04
1
0.01
4
100
4
10
5
- +
8
SW1
1
+6-15V
Gain=1000, BW=10Hz
* R1 is used to trim switchpoint
# provides 10Hz rolloff
LMC7101
3
0.15µF#
6
1M
5 mA
Vout
Figure 19—One-Axis Low Cost Sensor
7
4
400
Magnetic
3
Sensor
1.6Ω
+5V
Pulse
S/R
LED
1
OUT-1
V
S/R+3
GND4
S/R-5
O
O
OUT+8
HMC1021S
8
5
BRIDGE
FFSET+
FFSET-
V+
7
2
6
R1*
R2*
Z
* R1 or R2 used to trim offest
**R3 = 451Ω for 1 axis, 921Ω for 2 axis, or 1411Ω for 3 axis
# provides 1KHz rolloff
+5V
2
3
Sensitive
12
Direction
4
1
-
+
7
strong (200 gauss) and have one of its magnetic poles
point along the sensitive direction of the sensor. This
circuit can be used to detect a door open/closed status or
the presence or absence of an item. Figures 17, 18, 19,
20 and 21 show other circuit examples.
650
5
Magnetic
3
Figure 17—One-Axis Sensor With Digital Interface
Sensor
8
1.6Ω
AMP04
V+
1.5nF#
Pulse
6
S/R
25K
1
LM440
2.5V
+
-
AMP623
8
5
200
V+
Vout
Vref
2.5V
R1*
R2*
LM404-2.5
10
12
7
8
9
2
3
+5V
1
-
+
Ain+
Ain-
Ref+
Ref-
Gnd
* R1 or R2 used to trim offest
# provides 1KHz rolloff
650
5
25K
8
16 bit A/D
+5V
CS5509
AMP04
V+
1.5nF#
6
25K
NDRDY
LM440
2.5V
SDATA
CONV
SCLK
NCS
CAL
XIN
V+
Vout
Vref
6,11,13
2
14
15
16
4
3
1
10
12
7
8
9
Vout
Gnd
Ain+
Ain-
Ref+
Ref-
Gnd
V+
16 bit A/D
+5V
CS5509
NDRDY
SDATA
CONV
SCLK
NCS
CAL
XIN
V+
6,11,13
2
14
15
16
4
3
1
+5V