L6472 datasheet(37/69 Pages) STMICROELECTRONICS

Part #	L6472

Description	dSPIN fully integrated microstepping motor driver

PDF	69 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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37 / 69 page

L6472

Phase current control

Doc ID 022729 Rev 1

37/69

Figure 19.

Fast decay tuning during the falling steps

7.4

Torque regulation (output current amplitude regulation)

The output current amplitude can be regulated in two ways: writing the TVAL_ACC,

TVAL_DEC, TVAL_RUN and TVAL_HOLD registers or varying the ADCIN voltage value.

The EN_TQREG bit (CONFIG register) sets the torque regulation method. If this bit is high,

the ADC_OUT prevalue is used to regulate output current amplitude (see Section 9.1.14).

Otherwise the internal analog-to-digital converter is at the user’s disposal and the output

current amplitude is managed by the TVAL_HOLD, TVAL_RUN, TVAL_ACC and

TVAL_DEC registers (see Section 9.1.10).

The voltage applied to the ADCIN pin is sampled at fS frequency and converted in an NADC

bit digital signal. The analog-to-digital conversion result is available in the ADC_OUT

L6472 Datasheet(PDF) 37 Page - STMicroelectronics