AK8779A Datasheet, PDF (5/13 Pages) Asahi Kasei Microsystems – Hall Effect IC for Pulse Encoders

[AK8779A]
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 F pin, D pin, I_SINK = 15mA
Output Leak Current
I_LEAK
10
µA F, D = 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. 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
N
0
B
S
Brp Boff Bop
Figure 3. Definition of Bh and Boff
015001035-E-02
-5-
2015/07