L6470HTR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6470HTR

Fully integrated microstepping motor driver with motion engine and SPI

STMicroelectronics 

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L6470

Phase current control

Figure 16. Motor supply voltage compensation circuit

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

CONFIG register (see Table 22 on page 49, Section 9.1.21 on page 49). If the

EN_VSCOMP bit is low, the compensation is disabled and the internal analog-to-digital

converter is at the user’s disposal; sampling rate is always equal to PWM frequency.

7.6

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 L6470 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 (see Section 9.1.15 on page 46) multiplies the duty

cycle value allowing a higher phase resistance value to be faced.

The compensation algorithm and the eventual motor temperature measurement should be

implemented by microcontroller firmware.

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