FAN8729 Fairchild Semiconductor, FAN8729 Datasheet - Page 15

• Manufacturer Part Number: FAN8729
• Description: Motor / Motion / Ignition Controllers & Drivers BLDC+4CH BTL
• Manufacturer: Fairchild Semiconductor
• Type: Spindle Motor Controllerr

Specifications of FAN8729

• Operating Temperature Classification: Commercial
• Package Type: PQFP
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 13.2V
• Operating Supply Voltage: 4.5 V to 13.2 V
• Supply Current: 16.5 mA
• Mounting Style: SMD/SMT
• Package / Case: QFPH-48
• Lead Free Status / RoHS Status: Compliant

FAN8729
7. Rotational Direction Detecting Function
• Rotation detection circuit gives the result to DIR pin by
• Detects the MD’s rotational direction using hall signals H2 and
• Feature Table.
• In case of forward rotational detection, the phase of hall signal shows as H3→ H2→ H1 as follows;
• In case of reverse rotational detection, the phase of hall signal shows as H1→ H2→ H3 as follows;
• Forward/Reverse rotational direction is decided as follows. When hall signal H3 is falling edge, if H2 shows "High", the
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detecting the MD’s rotational direction.
H3.
rotational direction is "Forward", and if H2 shows "Low", rotational direction is "Reverse".
EC < ECR
EC > ECR
Rotation
Reverse
Forward
H 1
H 2
H 1
H 2
H 3
H 3
High
Low
DIR
H2+
H2-
H3+
H3-
+
-
+
-
(a)
(b)
D
CK
D-F/F
R
Q
8
DIR