STK672-080 Sanyo Semicon Device, STK672-080 Datasheet - Page 6

• Manufacturer Part Number: STK672-080
• Description: Stepping Motor Driver (Sine Wave Drive) Output Current : 2.8 A (No Heat Sink)
• Manufacturer: Sanyo Semicon Device

Power-on reset
The application must perform a power-on reset operation when V
Application circuit that used 2W1-2 phase excitation (microstepping operation) mode.
Simplified power-on reset circuit
(This circuit cannot be used to detect
drops in the power-supply voltage.)
Setting the Motor Current
The motor current I
between I
R
Vref = V
I
K: 4.7 (Voltage division ratio), Rs: 0.15 Ω (The hybrid IC’s internal current detection resistor (precision: ±3%)
Applications can use motor currents from the current (0.05 to 0.1 A) set by the duty of the frequency set by the oscillator
up to the limit of the allowable operating range, I
Function Table
OH
M3
O
CWB
X = (R
1
0
= —
M2
M1
1
k
CC
OH
O
1-2 phase excitation
Vf
2 phase excitation
2 6 kΩ) (R
2 R
—— ·············································(3)
Vref
and Vref.
R
Forward
0.3V
S
0A
O
0
0
0
X (R
V CC 2=5V
OH
is set by the Vref voltage on the hybrid IC pin 7. The following formula gives the relationship
+
O
O
1 + R
2 + 6 kΩ) ·············(1)
CLK
W1-2 phase excitation
1-2 phase excitation
ENABLE
O
X) ··············(2)
CBW
Reverse
MoI
0
1
1
RESET
Motor current waveform
2W1-2 phase excitation 4W1-2 phase excitation
OH
W1-2 phase excitation
14
14 8
14
14 9
14
14
12
15
11
13
10
14
= 2.8 A
STK672-080
STK672-080
V CC 2=5V
1
0
6
CC
5
4
3
2
1
7
2 power is first applied to this hybrid IC.
2W1-2 phase excitation
A
AB
B
BB
RoX
ENABLE
RESET
Two-phase stepping motor
1
1
V CC 2=5V
Vref
Ro1
Ro2
Motor current is cut off when low
A value of about 100 Ω is recommended for
R
pin internal impedance, which is 6 kΩ.
R
V CC 1=10V to 45V
O
O
Ioave
2 to minimize the influence of the Vref
X: The input impedance is 6 kΩ ±30%.
Phase switching clock edge timing
Active low
Rising and falling edges
I OL I OH
SG
PG
Rising edge only
+
A13262
A13261
No. 6507-6/17