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PDF AK8779A Data sheet ( Hoja de datos )
| Número de pieza | AK8779A | |
| Descripción | Hall Effect IC | |
| Fabricantes | AKM | |
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[AK8779A]
AK8779A
Hall Effect IC for Pulse Encoders
1. General Description
The AK8779A is a Hall effect latch which detects both “vertical magnetic field” and “horizontal magnetic
field” (perpendicular and parallel to the marked side of the package) at the same time. The pulse output
F and the direction output D are switched according to the vertical and horizontal magnetic fields applied
to the device. The direction is calculated internally and output D is switched on a rising or falling edge of
output F. The AK8779A is for use in the incremental pulse encoders or rotational detection systems.
Supply Voltage:
Operation Temperature:
Sensitivity (Vertical):
Sensitivity (Horizontal):
Two Outputs:
Package:
2. Features
3.8 to 24V
40 to 150ºC
±2.0mT(Typ.), ±4.0mT(Max.)
±2.0mT(Typ.), ±4.0mT(Max.)
F (Pulse)
D (Direction)
6-pin SOP (RoHS Compliant, Halogen free)
015001035-E-02
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1 page  
[AK8779A]
7. Recommended Operating Conditions
Table 4. Recommended operating conditions
Parameter
Symbol
Supply Voltage
Output Current
Operation Temperature
VDD
ISINK
Ta
Min.
3.8
40
Typ.
12
Max.
24
15
150
Unit
V
mA
ºC
8. Electrical Characteristics
Table 5. Electrical characteristics at VDD = 3.8 to 24V, Ta = 40 to 150ºC
Parameter
Symbol Min. Typ. Max. Unit Description
Current Consumption
IDD 1.7 3.5 6.2 mA VDD = 3.8 to 24V
Current Consumption (2)
IDD2 1.7 3.5
6.0 mA VDD = 3.8 to 18V
Output Saturation Voltage VSAT
0.4 V F pin, D pin, ISINK = 15mA
Output Leak Current
ILEAK
10 µA F, D = VDD
Output Refresh Period
Tp 5.0 8.3 16.7 µs
9. Magnetic Characteristics
Table 6. Magnetic characteristics at VDD = 3.8 to 24V, Ta = 40 to 150ºC
Parameter
Symbol
Min. Typ. Max. Unit Description
Operate point of vertical magnetic field
BopV
0.5 2.0 4.0 mT (* 2)
Release point of vertical magnetic field
BrpV
4.0 2.0 0.5 mT (* 2)
Operate point of horizontal magnetic field
BopH
0.5 2.0 4.0 mT (* 3)
Release point of horizontal magnetic field
BrpH
4.0 2.0 0.5 mT (* 3)
Hysteresis
BhV, BhH 2.0 4.0 6.4 mT (* 2, * 3, * 4)
Magnetic offset
BoffV, BoffH 1.1 0.0 +1.1 mT (* 2, * 3, * 5)
* 2. Horizontal magnetic flux density is zero.
* 3. Vertical magnetic flux density is zero
* 4. Bh = Bop – Brp
* 5. Boff = (Bop + Brp) / 2
Internal signal A/B
Bh/2 Bh/2
B
N0
S
Brp Boff Bop
Figure 3. Definition of Bh and Boff
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5 Page 
14.1. Outline Dimensions
6-pin SOP (Unit: mm)
14. Package
[AK8779A]
Figure 12. Outline Dimensions
* The center of the sensitive area is located within a φ0.3mm circle.
* Lead flatness: The standoff differences among terminals are Max. 0.1mm.
* The sensor part is located at 0.71mm (Typ.) deep from the marked surface.
14.2. Material of Terminals
Material:
Plating:
Thickness:
Cu alloy
Sn 100%
10µm (Typ.)
015001035-E-02
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2015/07
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AK8779A.PDF ] | |
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