AK8779B Datasheet, PDF (5/13 Pages) Asahi Kasei Microsystems – Hall Effect IC for Pulse Encoders

[AK8779B]
7. Recommended Operating Conditions
Table 4. Recommended operating conditions
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply Voltage
Output Current
Operation Temperature
V_DD
3.8
12
24
V
I_SINK
15
mA
Ta
40
150
ºC
8. Electrical Characteristics
Table 5. Electrical characteristics at V_DD = 3.8 to 24V, Ta = 40 to 150ºC
Parameter
Symbol Min. Typ. Max. Unit Description
Current Consumption
I_DD
1.7 3.5 6.2 mA V_DD = 3.8 to 24V
Current Consumption (2)
I_DD2 1.7 3.5 6.0 mA V_DD = 3.8 to 18V
Output Saturation Voltage V_SAT
0.4 V OUTA pin, OUTB pin, I_SINK = 15mA
Output Leak Current
I_LEAK
10 µA OUTA, OUTB pin = V_DD
Output Refresh Period
Tp 5.0 8.3 16.7 µs
9. Magnetic Characteristics
Table 6. Magnetic characteristics at V_DD = 3.8 to 24V, Ta = 40 to 150ºC
Parameter
Symbol
Min. Typ.
Operate point of vertical magnetic field
BopV
0.5 2.0
Release point of vertical magnetic field
BrpV
4.0 2.0
Operate point of horizontal magnetic field
BopH
0.5 2.0
Release point of horizontal magnetic field
BrpH
4.0 2.0
Hysteresis
BhV, BhH 2.0 4.0
Magnetic offset
BoffV, BoffH 1.1 0.0
Max.
4.0
0.5
4.0
0.5
6.4
+1.1
Unit Description
mT (* 2)
mT (* 2)
mT (* 3)
mT (* 3)
mT (* 2, * 3, * 4)
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
OUTA/OUTB signal
Bh/2 Bh/2
N
0
Brp Boff
B
S
Bop
Figure 3. Definition of Bh and Boff
015001034-E-02
-5-
2015/10