SPMD150STP STMicroelectronics, SPMD150STP Datasheet - Page 18

• 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
18/23
The clock pulse, with the HALF/FULL input high, advances the state machine from state 1 to
either state 2 or 8 depending on the CW/CCW input.
Starting from this point, keeping the HALF/FULL input low, the state machine will advance
following the sequence 2,4,6,8,… if CW/CCW is high (Clockwise movement) or 8,6,4,2,… if
CW/ CCW is low (Counterclockwise movement).
Figure 19. Wave drive mode
Microstepping
STMD150STP has two separate control current loop, with the possibility to set the current
level in an independent way (by means VREFA and VREFB); this feature make possible the
actuation of the micro-stepping mode.
Micro-stepping mode is a full step mode performed with a not fixed current in the motor
phases, but with a current varying in a sinusoidal mode;
that means the current flowing in the motor is not a square wave, but a sinusoidal wave.
Main commands remain the same, but during the period of each clock step, VREFA and
VREFB are incremented or decremented through a defined number of level, this number
gives the name to the micro-stepping granularity;
as example, a 64 micro-step per step means that, for each “standard” step there are 64 step
values on VREFA/B (from zero to VREFA/B max and from VREFB/A max to zero, see
Figure
20)
Doc ID 17160 Rev 1
SPMD150STP