FS212-A Feeling Technology Corp., FS212-A Datasheet - Page 10

• Manufacturer Part Number: FS212-A
• Description: 2-Phase DC Motor Drive IC
• Manufacturer: Feeling Technology Corp.

Lock Shutdown and Re-start Circuits and Timing Diagram
Fig 7 the shutdown control (SC) pin input connected with the capacitor to decide the
shutdown to re-start time with internal charge current and reset circuit. The capacitor is
charged to “A” point and shutdown (Figure 8, typical value is 0.7V) by an internal constant
current source as a situation of the motor is locked for a long-time condition cause DC motor
malfunction.
And the capacitor is discharged to “C” point (Figure 8,typical value is 0.3V) until internal
circuits detect a re-start threshold voltage (“B” point, typical value is 1.7V), and then FS212
would let the motor have a torque for rotation. The calculated formula of shutdown timing is :
Fig 8 illustrates the relation of FS212 output stages and SC pin timing waveform.
t
=
C
NO pin
SO pin
SC pin
∆
i
v
O/P Off
O/P On
Technology
i
=
0
8 .
Internal Constant Current Source
uA
,
∆v
=
Fig 7 SC Block Diagram
(1.7-0.7)V
Fig 8 Timing Diagram
0.7V
1.7V
Discharge
Circuit
A
Shutdown Re-start
C
B
1
SC pin
Shutdown
FS212
Rev0.4 April.08, 2003
0.47uF
C1
P
10
/FS212