AMIS30542C5421G ON Semiconductor, AMIS30542C5421G Datasheet - Page 17

• Manufacturer Part Number: AMIS30542C5421G
• Description: IC MOTOR DVR MICRO STEP 32QFP
• Manufacturer: ON Semiconductor
• Type: Micro Stepping Motor Driverr

Specifications of AMIS30542C5421G

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 2.2A
• Voltage - Supply: 6 V ~ 30 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VSQFP
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 6 V to 30 V
• Supply Current: 8 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Speed and Load Angle Output
level of the Back−e.m.f. voltage of the motor. This
Back−e.m.f. voltage is sampled during every so−called ”coil
coil during current decay, the coil voltage V
transient behavior. As this transient is not always desired in
application software, two operating modes can be selected
by means of the bit <SLAT> (see “SLA−transparency” in
Table 14 SPI Control Parameter Overview). The SLA pin
shows in “transparent mode” full visibility of the voltage
transient behavior. This allows a sanity−check of the
speed−setting versus motor operation and characteristics
and supply voltage levels. If the bit “SLAT” is cleared, then
only the voltage samples at the end of each coil current zero
crossing are visible on the SLA−pin. Because the transient
The SLA−pin provides an output voltage that indicates the
Because of the relatively high recirculation currents in the
V
I
COIL
COIL
V
BB
Micro−step
Previous
Figure 14. Principle of Bemf Measurement
COIL
I
COIL
shows a
Coil Current Zero Crossing
http://onsemi.com
Current Decay
ZOOM
17
Voltage Transient
Zero Current
current zero crossings”. Per coil, two zero−current positions
exist per electrical period, yielding in total four zero−current
observation points per electrical period.
behavior of the coil voltage is not visible anymore, this mode
generates smoother Back e.m.f. input for post−processing,
e.g. by software.
output level (0 V to 5 V), the sampled coil voltage V
divided by 2 or by 4. This divider is set through an SPI bit
<SLAG>. (see Table 14 SPI Control Parameter Overview)
SLA−pin and the transparency−bit. “PWMsh” and “I
0” are internal signals that define together with SLAT the
sampling and hold moments of the coil voltage.
In order to bring the sampled Back e.m.f. to a descent
The following drawing illustrates the operation of the
V
BEMF
|V
Micro−step
BEMF
Next
|
t
t
t
COIL
COIL
is
=