STK672-110 Sanyo Semicon Device, STK672-110 Datasheet - Page 5

• Manufacturer Part Number: STK672-110
• Description: Two-Phase Stepping Motor Driver (Square Wave Drive) Output Current: 1.8 A
• Manufacturer: Sanyo Semicon Device

Usage Notes
• 5-V system input pins
See the timing chart for details on the CLOCK, MODE, CWB, and other input pins.
[Vref <Motor current peak value setting>]
In the sample application circuit, the peak value of the motor current (I
described by the formula below.
I
Vref = (R02 (R01 + R02)) 5 V
STK672-110 : Rs = 0.22 Ω
• Allowable motor current operating range
OH
[RESETB and CLOCK (Input signal timing when power is first applied)]
As shown in the timing chart, a RESETB signal input is required by the driver to operate with the timing in which the
F1 gate is turned on first. The RESETB signal timing must be set up to have a width of at least 20 µs, as shown below.
The capacitor CO4 and the resistor RO3 in the application circuit form simple reset circuit that uses the RC time
constant rising time. However, when designing the RESETB input based on CMOS levels, the application must have
the timing shown in figure 1.
The motor current (I
For example, if the operating substrate temperature Tc is 105°C, then I
hold mode I
= Vref Rs Here, Rs is hybrid IC internal current detection resistor
O
must be held under I
Rise of the 5-V supply voltage
RESETB signal input
CLOCK signal
O
) must be held within the range corresponding to the area under the curve shown in figure 4.
Figure 2 Motor Current I
Figure 1 RESETB and CLOCK Signals Input Timing
O
max = 1.5 A.
At least 20 µs
STK672-110
O
Flowing into the Driver IC
At least 10 µs
O
O
must be held under I
) is set by RO1, RO2, and V
O
max = 1.8 A, and in
DD
No. 6041-5/9
(5 V) as