STK672-523-E View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
STK672-523-E Datasheet PDF : 22 Pages
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• Motor current peak value IOH setting
IOH
STK672-523-E
0
• When RO2 is open
IOH= [Vref×1k/(1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs
The values 1k and 3.9k represent internal driver resistance values, while Rs represents the internal driver current
detection resistance.
Vref= (4.9k÷ (4.9k+RO1)) ×5V (or 3.3V) =IOH×4.9×Rs
The value 4.9k represents the series resistance value of the internal driver values of 1k and 3.9k.
• If RO2 is connected
IOH= [Vref×1k/ (1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs
The values 1k and 3.9k represent the internal driver resistance values, while Rs represents the internal driver current
detection resistance.
Vref= (R0x÷ (RO1+R0x)) ×5V (or 3.3V) =IOH×4.9×Rs
= [(4.9k×RO2) ÷ ((4.9k×RO2) +RO1× (4.9k+RO2))] ×5V(or 3.3V)
R0x= (4.9k×RO2) ÷ (4.9k+RO2)
Rs represents the current detection resistance inside the HIC, while the value 4.9k in the formula above represents the
internal resistance value of the Vref pin.
Rs=0.11Ω when using the STK672-543-E
Rs=0.165Ω when using the STK672-533-E
Rs=0.33Ω when using the STK672-523-E
[Smoke Emission Precuations]
If any of the output pins 2, 3, 4, and 5 is held open, the electrical stress onto the driver due to the inductive energy
accumulated in the motor could cause short-circuit followed by permanent damage to the internal MOSFET. As a result,
the STK672-523-E may give rise to emit smoke.
Input Pin Functions
Pin Name
Pin No.
Function
Input Conditions When Operating
CLOCK
9
Reference clock for motor phase current switching
Operates on the rising edge of the signal
MODE
8
Excitation mode selection
Low: 2-phase excitation
High: 1-2 phase excitation
CWB
10
Motor direction switching
Low: CW (forward)
High: CCW (reverse)
RESETB
11
System reset and A, AB, B, and BB outputs cutoff.
A reset is applied by a low level
Applications must apply a reset signal for at least 10μs
when VDD is first applied.
ENABLE
12
The A, AB, B, and BB outputs are turned off, and after
The A, AB, B, and BB outputs are turned off by a low-
operation is restored by returning the ENABLE pin to the
level input.
high level, operation continues with the same excitation
timing as before the low-level input.
(1) A simple reset function is formed from D1, CO2, RO3, and RO4 in this application circuit. With the CLOCK input
held low, when the 5V supply voltage is brought up a reset is applied if the motor output phases A and BB are
driven. If the 5V supply voltage rise time is slow (over 50ms), the motor output phases A and BB may not be driven.
Increase the value of the capacitor CO2 and check circuit operation again.
(2) See the timing chart for the concrete details on circuit operation.
No. A2110-6/22
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