參數(shù)資料
型號(hào)： UPD168117A
廠商： NEC Corp.
英文描述： 7-CHANNEL H-BRIDGE DRIVER WITH A MICRO STEP FUNCTION SUPPORTING PULSE INPUT
中文描述： 7通道H -橋甲微步支脈沖輸入功能驅(qū)動(dòng)程序
文件頁(yè)數(shù)： 12/24頁(yè)
文件大小： 275K
代理商： UPD168117A
Data Sheet S17486EJ1V0DS
12
μ
PD168117A
7. FUNCTIONAL DEPLOYMENT
7.1 Reset Function
This whole IC can be changed into a reset state by setting all of MODE
1
to MODE
4
to H, and all of IN
5A
, IN
5B
, IN
6A
,
IN
6B
, IN
7A
, and IN
7B
to L. In the state of reset, an output will be in Hi-Z state, and since it stops operation of an internal
circuit, it can make self-consumption current below 1
μ
A.
Be sure to perform a reset operation.
In the reset operation, the internal circuitry is stopped whenever possible, so that the self current consumption can
be reduced. When the external input signal is stopped, the current consumption can be lowered to 1
μ
A MAX.
Immediately after release of reset, excitation is started from the position where the current of ch1 is 100% and the
current of ch2 is 0%, in the micro step drive mode and 1-2 phase excitation drive mode. In the 2-phase excitation
drive mode, excitation is started from the position where the currents of ch1 and ch2 are 100%.
7.2 2-phase Excitation Drive Mode and 1-2 Phase Excitation Drive Mode
In the 2-phase excitation drive mode, current of ±100% is allowed to flow into ch1 and ch2 simultaneously. In the 1-
2 phase excitation drive mode, the motor can be driven at a higher torque by allowing a current to flow so that the
synthesized torque of ch1 and ch2 is the same as the torque at phase 1 position. The 2-phase excitation, 1-2 phase
excitation, and micro step driving modes are selected by the MODE
1
to MODE
4
pins.
Note that 100% (= saturation drive mode) and a mode in which the current set by the sense resistor is used
can be selected by the MODE pin. Current control is performed by chopping drive.
7.3 Micro Step Drive Mode of Stepping Motor
The current flowing into the H-bridge is constant by using a vector value so that one period can be stopped in 1/128
steps. This function is provided to realize high-accuracy positioning control of a stepping motor.
To realize this micro step driving, the following functions are internally realized by the driver.
Detection of current flowing into each channel by sense resistor as voltage value
Synthesizing half the dummy sine waveform generated by the internal D/A with PWM oscillation waveform for
chopping operation
Driver stage performing PWM drive based on result of comparing detected voltage and synthesized
waveform
Because the internal dummy sine wave consists of 128 steps per period, it can be used to drive a stepping motor
using 128 divisions. The micro step drive mode, 2-phase excitation drive mode, and 1-2 phase excitation drive mode
can be selected by using external pins.
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