L6474 datasheet(29/51 Pages) STMICROELECTRONICS

Part #	L6474

Description	easySPIN ??fully integrated microstepping motor driver

PDF	51 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 51 page

L6474

Phase current control

Doc ID 022529 Rev 2

29/51

Figure 12.

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 register or

varying the ADCIN voltage value.

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

ADC_OUT prevalue is used to regulate output current amplitude (see paragraph 9.1.8).

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

current amplitude is managed by the TVAL register (see paragraph 9.1.4).

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

L6474 Datasheet(PDF) 29 Page - STMicroelectronics