HMC1051_06 HONEYWELL [Honeywell Solid State Electronics Center], HMC1051_06 Datasheet - Page 10

• Manufacturer Part Number: HMC1051_06
• Description: 1, 2 and 3 Axis Magnetic Sensors
• Manufacturer: HONEYWELL [Honeywell Solid State Electronics Center]

HMC1051/HMC1052/HMC1053
reasonable capability of measuring from tens of milliamperes to beyond 20 amperes of alternating or direct currents. See
application note AN-209 for the basic principles of current sensing using AMR bridges.
Three Axis Compassing with Tilt Compensation
For full three-axis compassing, the circuit depicted in Figure 7 shows both a HMC1051 and a HMC1052 used for sensing
the magnetic field in three axes. Alternatively a single HMC1053 could be used for a single sensor package design. A
two-axis accelerometer with digital (PWM) outputs is also shown to provide pitch and roll (tilt) sensing, to correct the
three-axis magnetic sensors outputs into to the tilt-compensated two-axis heading. The accelerometer can be substituted
with a fluidic 2-axis tilt sensor if desired. For lower voltage operation with Lithium battery supplies (2.5 to 3.6Vdc), the
Set/Reset circuit should be upgraded from a single IRF7507 to the dual IRF7507 implementation (per Figure 2) to permit
a minimum 1-ampere pulse (500mA per set/reset strap resistance) to both the HMC1052 and HMC1051 sensors.
10
I
I
ac
ac
Current Measured
Current Measured
Conductor to be
Conductor to be
I
I
dc
dc
Vcc = 9Vdc
Vcc = 9Vdc
standoff distance
standoff distance
set/reset
set/reset
offset
offset
U1
U1
HMC1051
HMC1051
5.00k
5.00k
5.00k
5.00k
500k
500k
.1uf
.1uf
Vcc/2 ~ +4.5Vdc
Vcc/2 ~ +4.5Vdc
.1µf
.1µf
-
-
+
+
*
*
RC4558
RC4558
Low ESR Tantalum
Low ESR Tantalum
500k
500k
1µf*
1µf*
-
-
Si1553DL
Si1553DL
+
+
R
R
U2
U2
b
b
Vcc =9Vdc
Vcc =9Vdc
U3
U3
200Ω
200Ω
tempco
tempco
network
network
-
-
+
+
RC4458
RC4458
R
R
th
th
Current Sensor
R
R
a
a
Figure 6
set/reset
set/reset
output
output
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