AK8776 Datasheet, PDF (6/11 Pages) Asahi Kasei Microsystems – Hall IC for Pulse Encoder

[AK8776]
Behaviors of internal signal A,B and output signal F, D when a rotating magnetic field is applied on AK8776
F signal (pulse) is correspond to the result of internal signal A and B. And D signal (direction) is given by looking up
the state of signal A and B.
Direction changed
Direction changed
BopV
Vertical M.F.D. ^＊
BrpV
t
BopH
Horizontal M.F.D.
BrpH
t
Supply voltage V_DD
t
Internal signal A
(Vertical)
t
Internal signal B
(Horizontal)
t
F (Pulse)
t
D (Direction)
t
Undefined (High or Low)
F,D signal is determined.
Figure 4. Behaviors of internal signal A,B and output signal F, D
when a rotating magnetic field is applied on AK8776
*M.F.D. is Magnetic Flux Density.
Note) D signal is determined after one pulse sent out of F signal. The section which the output status is undefined
appears only in the starting up of this device.
MS1317-E-00
6
2011/July