SPMD150STP STMicroelectronics, SPMD150STP Datasheet - Page 16

• Manufacturer Part Number: SPMD150STP
• Description: MOD STEPPER MOTOR DRV 1.5A BIPO
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of SPMD150STP

• Motor Type: Stepper, Bipolar
• Number Of Motors: 1
• Current - Output: 1.5A
• Transistor Type: MOSFET
• Termination Style: PC Pin
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 50 V
• Supply Current: 1.5 A
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-10065

Function description and application information
4.5
4.5.1
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Figure 15. Fast decay mode output stage configurations
Figure 16
time, the lower power FET is switched off and the current recirculates around the upper half
of the bridge. Since the voltage across the coil is low, the current decays slowly. After the
dead time the upper power FET is operated in the synchronous rectification mode. When
the mono-stable circuit times out, the lower power FET is turned on again after some delay
set by the dead time to prevent cross conduction.
Figure 16. Slow decay mode output stage configurations
Stepping sequence generation
The phase sequence generator is a state machine that provides the phase and the enable
inputs for the two bridges to drive a stepper motor in either full step or half step. Two full step
modes are possible, the normal drive mode where both phases are energized each step
and the wave drive mode where only one phase is energized at a time. The drive mode is
selected by the HALF/FULL input and the current state of the sequence generator as
described below. A rising edge of the CLOCK input advances the state machine to the next
state. The direction of rotation is set by the CW/CCW input. The RESET input resets the
state machine to Home State.
Half step mode
A logic level high on the HALF/FULL input selects half step mode.
motor current waveforms and the state diagram for the phase sequencer generator. At start-
up or after a RESET the phase sequencer is at state 1, home state. After each clock pulse
the state changes following the sequence 1,2,3,4,5,6,7,8,… if CW/ CCW is high (Clockwise
movement) or 1,8,7,6,5,4,3,2,… if CW/CCW is low (Counterclockwise movement).
shows the operation of the bridge in the slow decay mode. At the start of the Off-
Doc ID 17160 Rev 1
Figure 17
shows the
SPMD150STP