UM1692 datasheet(37/42 Pages) STMICROELECTRONICS

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UM1692

General description

Initialization and configuration

Initialize peripherals used by L6472.

LED_READY (GREEN) is lighted up, other LEDs are switched off.

LED check sequence:

LED_ERROR (RED) is switched ON

LED_BUSY (ORANGE) is switched ON

LED_SPARE (YELLOW) is switched ON

LED_ERROR (RED), LED_BUSY (ORANGE) and LED_SPARE (YELLOW) are

switched OFF.

Resets and puts L6472 into the standby mode. The L6472 STBY_RESET pin goes low

for a few hundreds of µs and then goes high.

Program all L6472 registers | SetParam (PARAM, VALUE).

Flag signal management

Read status register content | GetStatus

Interrupt configuration for FLAG signal

Motor runs at constant speed of a 400 steps/s forward direction | Run (DIR, SPD)

Tentative to write to the current motor absolute position register while the motor is

running, as a consequence the LED_ERROR (RED) is lighted up | SetParam

(PARAM, VALUE)

10. “Get Status” to clear FLAG due to non performable command, as a consequence the

LED_ERROR (RED) is switched off | GetStatus

11. Motor stops smoothly | SoftStop

12. Wait until not busy - busy pin test (L6472 pin 22).

Busy signal management

13. Interrupt configuration for BUSY signal

14. Motor moves by 100,000 steps in a reverse direction | Move (DIR, N_STEP)

15. During busy time the LED_BUSY (ORANGE) is switched ON

16. L6472 disables the power bridges after a deceleration to zero phase | SoftHiZ

17. LED_BUSY (ORANGE) is switched OFF.

The LED_BUSY after the point 7 and the LED_ERROR after the point 13 are tied

respectively to the BUSY/SYNC pin and the FLAG pin. So for example they are lighted up

when the motor accelerates or decelerates. This is happening in the remaining part of the

demonstration although not mentioned.

UM1692 датащи(PDF) 37 Page - STMicroelectronics