HMC1051_06 HONEYWELL [Honeywell Solid State Electronics Center], HMC1051_06 Datasheet - Page 11

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

HMC1051/HMC1052/HMC1053
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 HMC105X family of magnetic sensors are
very low capacitance (Bandwidth > 5MHz) sensor bridges and can stabilize quickly, typically before the support
electronics can. Other energy saving ideas would be to minimize the quantity of set/reset pulses which saves energy over
the battery life. Figure 8 shows a simple supply switching circuit that can be microprocessor controlled to duty cycle
(toggle) the electronics in moderate current (<25mA) applications.
www.honeywell.com
3.3 to 5.0v
3.3 to 5.0v
Vcc
Vcc
Vcc
Vcc
set/reset
set/reset
set/reset
set/reset
offset
offset
To Sensor Circuits
To Sensor Circuits
U1
U1
HMC1052
HMC1052
HMC1051
HMC1051
* Used when Vcc = 5.0 volts, jumper
* Used when Vcc = 5.0 volts, jumper
when using Vcc = 3.3 volts or less.
when using Vcc = 3.3 volts or less.
U2
U2
Duty Cycling
.1uf
.1uf
Figure 8
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
5.00k
IRF7509
IRF7509
500k
500k
500k
500k
500k
500k
Three Axis Compass
1nf
1nf
1nf
1nf
.1µf
.1µf
Vcc/2
Vcc/2
Vcc/2
Vcc/2
Vcc/2
Vcc/2
-
-
+
+
MMBT2907ALT1
MMBT2907ALT1
LMV324
LMV324
LMV324
LMV324
U4
U4
LMV324
LMV324
Figure 7
U3
U3
*MMBD7001LT1
*MMBD7001LT1
500k
500k
500k
500k
500k
500k
0.01µf
0.01µf
10kΩ
10kΩ
Vcc
Vcc
Off
Off
Vcc
Vcc
accelerometer
accelerometer
+
+
-
-
10µf
10µf
Two-axis
Two-axis
On
On
yout
yout
xout
xout
Vcc/2
Vcc/2
U5
U5
Vcc
Vcc
set/reset
set/reset
Vcc
Vcc
toggle
toggle
Gnd
Gnd
µC
µC
DO0
DO0
AN0
AN0
AN1
AN1
AN2
AN2
AN3
AN3
DI0
DI0
DI1
DI1
Multiplexed
Multiplexed
A/D Conv.
A/D Conv.
with
with
µC
µC
U6
U6
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