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AK8775

P1-P3P4-P6P7-P9P10-P10
[AK8775]
MS1316-E-00 2011/July
1
AK8775 is a Hall effect latch which detects both “vertical” and “horizontal”(perpendicular and parallel to the
marking side of the package) magnetic field at the same time. The result of Hall effect latch operation in vertical and
horizontal magnetic field is read out to OUTA pin and OUTB pin. AK8775 is for use in portable devices which uses
rotational detection system or incremental pulse encoder such as jog dial utilized for input devices.
o 1.6 to 5.5V operation
o Bop, Brp (Vertical, Horizontal) ±1.5mT(Typ.), Highly sensitive
o Low power operation : Average 90μA(Typ.) @V
DD
=3V
o Two outputs : OUTA (detects vertical magnetic field), OUTB (detects horizontal magnetic field)
o Small package: SOP-4pin, Halogen free
AK8775
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P
P
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Features
Overview
[AK8775]
MS1316-E-00 2011/July
2
Figure 1. Block diagram
Table 1. Circuit configuration
Block Function
HALL SENSORS Two Hall elements fabricated by CMOS process.
CHOPPER_SW Perform chopping in order to cancel the offset of Hall sensor.
CHOP_AMP
Amplifies two Hall sensor output voltage with summation and subtraction
circuit.
COMP Hysteresis comparator.
BIAS Generates bias current to other circuits.
HE_DRIVE Generates bias current for Hall sensors.
OSC Generates operating clock.
TIMING LOGIC Generates timing signal required for Chopper SW, AMP and COMP.
LATCH & LOGIC Logical circuits and CMOS output buffer.
Block Diagram
Circuit Configuration
TIMING LOGIC
HE_DRIVE
BIAS OSC
COMP CHOP_AMP
HALL SENSORS
OUTA
OUTB
VDD
VSS
LATCH&LOGIC
CHOPPER_SW
[AK8775]
MS1316-E-00 2011/July
3
Table 2. Description of pin name and function
Pin No.
Pin name
I/O Function Note
1 VDD
−
Power supply pin
2 OUTA O
Output A pin. Relating to the vertical magnetic field
CMOS output
3 OUTB O
Output B pin. Relating to the horizontal magnetic field
CMOS output
4 VSS
−
Ground pin
Table 3. Absolute maximum ratings
Parameter Symbol Min. Max. Unit Note
Power supply voltage V
DD
−0.3
+6.5
V
Output current I
OUT
−0.5
+0.5
mA OUTA,OUTB pin
Storage temperature T
STG
−40
+125
°C
Note) Stress beyond these listed values may cause permanent damage to the device.
Table 4. Recommended operating conditions
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage V
DD
1.6 3.0 5.5 V
Operating temperature Ta
−30
+85
°C
Table 5. Electrical characteristics (Ta=25°C, V
DD
= 3.0V)
Parameter Symbol Min. Typ. Max. Unit Note
Current consumption I
DD
90
210
µA
Average
High level output Voltage V
OH
V
DD
-0.4
V OUTA,OUTB pin,
I
OUT
= −0.5mA
Low level output Voltage V
OL
0.4
V OUTA,OUTB pin,
I
OUT
= +0.5mA
Pulse drive period T
PD1
0.5 1.0 2.0 ms
Pulse drive duration time T
PD2
12.2
24.4
48.8
µs
Note) Internal data is determined just before the internal circuit turns off. And after 6.1μs (Typ.), the output
changes.
Electrical Characteristics
Absolute Maximum Ratings
Recommended Operating Conditions
Pin/Function
P1-P3P4-P6P7-P9P10-P10

AK8775

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Description:
MAGNETIC SWITCH LATCH 4SOP
Lifecycle:
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