STK672-440AN-E Datasheet, PDF (12/26 Pages) ON Semiconductor – 2-phase Stepper Motor Driver

STK672-440AN-E
1.I/O Pins and Functions of the Control Block
[Pin description]
HIC pin
7
10
11
17
12
13
14
15
16
8
19
Pin Name
MOI
MODE1
MODE2
MODE3
CLOCK
CWB
RESETB
ENABLE
FAULT1
FAULT2
Vref
Function
Output pin for the excitation monitor
Excitation mode selection
External CLOCK (motor rotation instruction)
Sets the direction of rotation of the motor axis
System reset
Motor current OFF
Overcurrent/over-heat detection output
Current value setting
Description of each pin
1-1.[CLOCK (Phase switching clock)]
Input frequency: DC-20kHz (when using both edges) or DC-50kHz (when using one edge)
Minimum pulse width: 20s (when using both edges) or 10s (when using one edge)
Pulse width duty: 40% to 50% (when using both edges)
Both edge, single edge operation
M3:1 The excitation phase moves one step at a time at the rising edge of the CLOCK pulse.
M3:0 The excitation phase moves alternately one step at a time at the rising and falling edges of the CLOCK pulse.
1-2.[CWB (Motor direction setting)]
When CWB=0: The motor rotates in the clockwise direction.
When CWB=1: The motor rotates in the counterclockwise direction.
Do not allow CWB input to vary during the 7s interval before and after the rising and falling edges of CLOCK input.
1-3. [ENABLE (Forcible OFF control of excitation drive output A, AB, B, and BB, and selecting operation/hold status
inside the HIC)]
ENABLE=1: Normal operation
When ENABLE=0: Motor current goes OFF, and excitation drive output is forcibly turned OFF.
The system clock inside the HIC stops at this time, with no effect on the HIC even if input pins other than RESET input
vary. In addition, since current does not flow to the motor, the motor shaft becomes free.
If the CLOCK signal used for motor rotation suddenly stops, the motor shaft may advance beyond the control position
due to inertia. A SLOW DOWN setting where the CLOCK cycle gradually decreases is required in order to stop at the
control position.
1-4. [MODE1, MODE2, and MODE3 (Selecting the excitation mode, and selecting one edge or both edges of the
CLOCK)]
Excitation select mode terminal (See the sample application circuit for excitation mode selection), selecting the
CLOCK input edge(s).
Mode setting active timing
Do not change the mode within 7s of the input rising or falling edge of the CLOCK signal.
1-5.[RESETB (System-wide reset)]
The reset signal is formed by the power-on reset function built into the HIC and the RESETB terminal.
When activating the internal circuits of the HIC using the power-on reset signal within the HIC, be sure to connect Pin
14 of the HIC to VDD.
1-6.[Vref (Voltage setting to be used for the current setting reference)]
Pin type: Analog input configuration and input pull-down resistance 100 k.
Input voltage is in the voltage range of 0.2V to 1.8V.
No.A2272-12/26