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參數(shù)資料
| 型號： | UPD168110 |
| 廠商： | NEC Corp. |
| 英文描述： | MICROSTEP DRIVER FOR DRIVING CAMERA LENS |
| 中文描述： | 微步驅(qū)動驅(qū)動光圈鏡頭 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 200K |
| 代理商： | UPD168110 |
Data Sheet S15840EJ2V0DS
9
μ
PD168110
FUNCTION DESCRIPTION
2-phase excitation driving mode
By allowing a current of
±
100% to flow into output ch1 and ch2 at the same time, a motor can be driven with the
larger torque.
The two-phase excitation driving mode and microstep driving mode are switched by the MODE pin. In the two-
phase excitation driving mode, the chopping pulse circuit does not operate.
Microstep driving of stepper motor
To position a stepper motor with high accuracy, the
μ
PD168110 has a function to hold constant the current flowing
through the H bridge by a vector value and to stop one cycle in 64 steps. To realize the microstep driving mode, the
driver internally realizes the following functions.
Detecting the current flowing into each channel as a voltage value by a sense resistor
Synthesizing the dummy sine wave of the half-wave generated by the internal D/A and PWM oscillation wave for
chopping operation
The driver stage performs PWM driving based on the result of comparing the detected voltage value and
synthesized waves.
The internal dummy sine wave is of 64 steps per cycle, so that the stepper motor can be driven in 64 steps. The
microstep driving mode and two-phase excitation driving mode are switched by an external pin.
A
M
+
Concept of microstep driving operation
MOB output
The MOB output pin outputs “L” if the current of ch1 or ch2 reaches
±
100% in the microstep output mode, or if the
current of ch 1 reaches +100%. In the two-phase excitation output mode, the MOB pin outputs “L” when the current of
ch1 and ch2 reaches +100%. The excitation position of the stepper motor can be checked by monitoring the MOB
output. The MOB output also indicates the stop position information in the stop mode to be explained below.
The MOB output goes into a Hi-Z state (output H level if pulled up) when OE = “L”.
Stop mode
If the stop mode is set by the STOP pin, the pulse is automatically output until MOB = “L” when CLK is input. If
MOB = “L” in the stop mode, the pulse is not output even when CLK is input, and the output holds the excitation
status.
To advance the pulse, release the stop mode and restore the normal mode.
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