HMC1051ZL Honeywell, HMC1051ZL Datasheet - Page 7

• Manufacturer Part Number: HMC1051ZL
• Manufacturer: Honeywell

Specifications of HMC1051ZL

• Lead Free Status / Rohs Status: Not Compliant

HMC1051Z / HMC1052
Three Axis Compassing with Tilt Compensation
For full three-axis compassing, the circuit depicted in Figure 6 shows both a HMC1051Z and a HMC1052 used for
sensing the magnetic field in three axes. A two-axis accelerometer is also shown to provide pitch and roll (tilt)
sensing to correct the three-axis data into to the corrected 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 to permit a
minimum 1.0 ampere pulse (0.5 ampere per set/reset strap resistance) to both the HMC1052 and HMC1051 sensors.
Duty Cycling for Lower Energy Consumption
For battery powered and other applications needing limited energy consumption, the sensor bridge and support
electronics can be switched “off” between magnetic field measurements. The HMC1051Z and HMC1052 are very low
capacitance (Bandwidth > 5MHz) sensor bridges and can stabilize typically before the support electronics can. Also
minimizing the quantity of set/reset pulses will save energy too. Figure 7 shows a simple supply switching circuit that
can be microprocessor controlled to duty cycle (toggle) the electronics in moderate current (<25mA) applications.
Solid State Electronics Center • www.magneticsensors.com • [phone] • Page 7
3.3 to 5.0v
Vcc
Vcc
set/reset
set/reset
offset
U1
HMC1052
HMC1051
U2
.1uf
Figure 6
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
IRF7507
500k
500k
500k
1nf
1nf
.1 µ f
Vcc/2
Vcc/2
Vcc/2
-
+
LMV324
LMV324
U4
LMV324
U3
500k
500k
500k
Vcc
accelerometer
Two-axis
yout
xout
Vcc/2
U5
Vcc
set/reset
SENSOR PRODUCTS
DO0
AN0
AN1
AN2
AN3
DI0
DI1
Multiplexed
A/D Conv.
with
µ C
U6