POWERSTEP01 datasheet(42/92 Pages) STMICROELECTRONICS

Part #	POWERSTEP01

Description	System-in-package integrating microstepping controller and 10 A power MOSFETs

PDF	92 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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42 / 92 page

Phase current control: voltage mode

powerSTEP01

42/92

DocID025022 Rev 5

Motor supply voltage compensation can be enabled setting high the EN_VSCOMP bit of the

CONFIG register (seeTable 46 on page 68). If the EN_VSCOMP bit is low, the

compensation is disabled and the internal analog to digital converter is at the user’s

disposal; the sampling rate is always equal to PWM frequency.

8.6

Winding resistance thermal drift compensation

The higher the winding resistance the greater the voltage to be applied in order to obtain the

same phase current.

The powerSTEP01 integrates a register (K_THERM) which can be used to compensate

phase resistance increment due to temperature rising.

The value in the K_THERM register (Section 11.1.15 on page 57) multiplies duty cycle value

allowing the higher phase resistance value to be faced.

The compensation algorithm and the eventual motor temperature measurement should be

implemented by microcontroller firmware.

POWERSTEP01 Datasheet(PDF) 42 Page - STMicroelectronics