LB11975 Datasheet, PDF (7/12 Pages) Sanyo Semicon Device – High-Speed CD-ROM Spindle Motor Driver IC

LB11975
Pin Functions
Pin No.
9
8
29
Pin
V_CC2
V_CC3
27
V_CC1
24
RS
Pin voltage
4 V to 16 V
Function
Supplies the source side pre-drive
voltage.
4 V to 16 V Supplies the motor drive voltage.
4 V to 16 V
Supply voltage for all circuits other than
the output transistors and the source side
pre-drive voltage
Reverse rotation detection
High-level output: Forward rotation
Low-level output: Reverse rotation
26
FG1
Single Hall device waveform Schmitt
comparator synthesized output
25
FG2
Three Hall device waveform Schmitt
comparator synthesized output
23
IN1⁺
22
IN1^–
U phase Hall device input.
Logic high refers to the state where IN1⁺
> IN1^–.
21
20
IN2⁺
IN2^–
1.5 V to
V_CC1 – 1.5 V
V phase Hall device input.
Logic high refers to the state where IN2⁺
> IN2^–.
19
IN3⁺
18
IN3^–
W phase Hall device input.
Logic high refers to the state where IN3⁺
> IN3^–.
16
VH
Provides the Hall device lower side bias
voltage.
Equivalent circuit
10kΩ
VCC1
24 25 26
19
500Ω
21
23
VCC 1
18
500Ω
20
22
30kΩ
2kΩ
VCC1
16
All circuits can be set to the non-operating
15
S/S
0 V to V_CC1
state by setting this pin to 0.7 V or under,
or by setting it to the open state.
This pin must be held at 2 V or higher.
17
GND1
Ground for all circuits except the output
75kΩ
15
50kΩ
VCC1
Continued on next page.
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