lv8740v ON Semiconductor, lv8740v Datasheet - Page 11

• Manufacturer Part Number: lv8740v
• Description: Pwm Current Control Stepping Motor Driver
• Manufacturer: ON Semiconductor

(5) Reset function
(6) Output enable function
The output ammeter calculation type when the attenuation function of the VREF input voltage is used is as follows.
(Example) When VREF = 1.5V, setting current ratio = 100% [(ATT1, ATT2) = (Low, Low)] and RF resistor = 0.2Ω,
the following output current flows :
Under such a condition, when assuming (ATT1, ATT2) = (High, High).
The power saving can be done, and attenuating the output current when the motor energizes maintenance.
When the RST pin is set High, the output excitation position is forced to the initial state, and the MONI output enters
ON a state. When RST is set Low after that, the excitation position proceeds to the next STEP input.
1ch output
2ch output
1ch output
2ch output
IOUT=(VREF/5)×(Attenuation ratio)/RF resistance
I OUT = 1.5V/5×100%/0.2Ω=1.5A
I OUT = 1.5A×33.3%=500mA
STEP
MONI
STEP
MONI
RST
OE
RST
High
High
Low
Low
OE
0%
0%
Output is high-impedance
Power save mode
Initial state
RESET
Normal operation
Operating mode
Operating mode
Output OFF
Reset state
Output ON
LV8740V
No.A1864-11/23