L6470PD datasheet(35/70 Pages) STMICROELECTRONICS

部件名	L6470PD

功能描述	dSPIN fully integrated microstepping motor driver with motion engine and SPI

PDF	70 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

35 / 70 page

L6470

Phase current control

Doc ID16737 Rev 5

35/70

7.2

Sensorless stall detection

Depending on motor speed and load angle characteristics, the L6470 offers a motor stall

condition detection using a programmable current comparator.

When a stall event occurs, the respective flag (STEP_LOSS_A or STEP_LOSS_B) is forced

low until a GetStaus command or a system reset occurs (see Section 9.2.20).

7.3

Low speed optimization

When the motor is driven at a very low speed using a small driving voltage, the resulting

phase current can be distorted. As a consequence, the motor position is different from the

ideal one (see Figure 15).

The L6470 implements a low speed optimization in order to remove this effect.

Figure 15.

Current distortion and compensation

The optimization can be enabled setting high the LSPD_OPT bit in the MIN_SPEED register

(see Section 9.1.8) and is active in a speed range from zero to MIN_SPEED. When low

speed optimization is enabled, speed profile minimum speed is forced to zero.

L6470PD 数据表(PDF) 35 Page - STMicroelectronics