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)： 15/24頁(yè)
文件大小： 275K
代理商： UPD168117A
Data Sheet S17486EJ1V0DS
15
μ
PD168117A
7.7 Selecting 2-phase Excitation/Micro Step Drive Mode
The 2-phase excitation, 1-2 phase excitation, or micro step drive mode can be selected by using the MODE
1
to
MODE
4
pins. Refer to
Table 5
1. Mode Pin Truth Table
for details.
Immediately after release of reset, the IC is initialized. In the 1-2 phase excitation and micro step drive mode,
excitation is started from the position where the output current of ch1 (ch3) is 100% and output current of ch2 (ch4) is
0%. In the 2-phase excitation drive mode, excitation is started from the position where the currents of both ch1 (ch3)
and ch2 (ch4) are +100%.
When the mode is changed from the micro step driving to the 2-phase excitation (or 1-2 phase excitation), the
position of micro step is held until CLK is input.
When the rotation direction does not change,
pulse output is started by the first CLK input, the position is skipped to
the 2-phase position of the next quadrant (or to the closest 1-2 phase position at the rotation direction destination),
and driving is started.
When the rotation direction changes, it is skipped to 2-phase position of the next quadrant, or 1-2-phase position to
the direction which changed, and a drive is started.
Figure 7
2. Concept of Change Operation, Micro Step Driving
2-phase Excitation (1-2 Phase Excitation)
poMicrostep stop
Microstep stop
position (example 2)
2-phase excitation
stop position
(1)
Skipes to the next
quadrant
(4)
(3)
(2)
7.8 Under-voltage Lockout (UVLO) Circuit
This function is to forcibly stop the operation of the IC to prevent malfunctioning if V
DD
drops. When UVLO operates,
the IC is in the reset status. If V
DD
drops abruptly in the order of several
μ
s, this function may not operate.
7.9 Overheat Protection (TSD) Circuit
This function is to forcibly stop the operation of the IC to protect it from destruction due to overheating if the chip
temperature of the IC rises.
The overheat protection circuit operates when the chip temperature rises to 150
°
C or more. When overheat is
detected, all the circuits are stopped. When reset state or when UVLO is detected, the overheat protection circuit
does not operate.
7.10 Power Up Sequence
This IC has a circuit that prevents current from flowing into the V
M
pin when V
DD
= 0 V. Therefore, the current that
flows into the V
M
pin is cut off 1
μ
A MAX. when V
DD
= 0 V.
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