根据datasheet的说明，有两点与常见步进电机驱动芯片不同的地方。
1.同步模式 ，与电流噪声有关
2.睡眠模式，sla7062无使能引脚，用电压基准代替，电压基准高于2V就进入睡眠模式，无锁相电流。
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Synchronous operation mode.
This function pre-
vents occasional motor noise during a “hold” state, which
normally results from asynchronous PWM operation of
both motor phases. A logic high at the SYNC input is
synchronous operation; a logic low is asynchronous
operation. The use of synchronous operation during
normal stepping is not recommended because it produces
less motor torque and can cause motor vibration due to
stair-case current.
------------------------------
Sleep mode.
Applying a voltage greater than 2 V to the
REF pin disables the outputs and puts the motor in a free
state (coast). This function is used to minimize power
consumption when not in use. Although it disables much
of the internal circuitry including the output MOSFETs
and regulator, the sequencer/translator circuit is active and
therefore a microcontroller can set the step starting point
for the next operation during the sleep mode. When
coming out of sleep mode, wait 100 µs before issuing a
step command to allow the internal circuitry to stabilize.
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发表于 2012-10-13 22:46
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