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BU52004GUL, BU52014HFV 
Technical Note
 
6/11
www.rohm.com
2010.01 - Rev.D
?2010 ROHM Co., Ltd. All rights reserved.
? Description of Operations
 
Micropower Operation (Small current using intermittent action)
 
 
 
 
 
 
 
 
 
 
 
 
(Offset Cancelation)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(Magnetic Field Detection Mechanism)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The dual output bipolar detection Hall IC adopts an
intermittent operation method to save energy. At startup, the
Hall elements, amp, comparator and other detection circuits
power ON and magnetic detection begins. During standby,
the detection circuits power OFF, thereby reducing current
consumption. The detection results are held while standby
is active, and then output.
 
 
Reference period: 50ms (MAX100ms)
Reference startup time: 48約
I
DD
Standby
Startup time
Period 50ms
t
Fig.20
The Hall elements form an equivalent Wheatstone (resistor)
bridge   circuit.   Offset   voltage   may   be   generated   by   a
differential in this bridge resistance, or can arise from
changes in resistance due to package or bonding stress. A
dynamic offset cancellation circuit is employed to cancel this
offset voltage.
When Hall elements are connected as shown in Fig. 21 and a
magnetic field is applied perpendicular to the Hall elements,
voltage is generated at the mid-point terminal of the bridge.
This is known as Hall voltage.
Dynamic cancellation switches the wiring (shown in the
figure) to redirect the current flow to a 90? angle from its
original path, and thereby cancels the Hall voltage.
The magnetic signal (only) is maintained in the sample/hold
circuit   during   the   offset   cancellation   process   and   then
released.
 
GND
V
DD
 
 
I
B
?
Hall Voltage
Fig.21
The Hall IC cannot detect magnetic fields that run horizontal to the package top layer.
Be certain to configure the Hall IC so that the magnetic field is perpendicular to the top layer.
Fig.22
S
S
N
S
N
S
N
Flux direction
Flux direction
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