L6470 datasheet(48/70 Pages) STMICROELECTRONICS

48 / 70 page

Programming manual

L6470

48/70

Doc ID16737 Rev 4

When the SYNC_EN bit is set low, BUSY/SYNC output is forced low during command

execution, otherwise, when the SYNC_EN bit is set high, BUSY/SYNC output provides a

clock signal according to the SYNC_SEL parameter.

The synchronization signal is obtained starting from electrical position information (EL_POS

9.1.20

ALARM_EN

The ALARM_EN register allows the selection of which alarm signals are used to generate

the FLAG output. If the respective bit of the ALARM_EN register is set high, the alarm

condition forces the FLAG pin output down.

Table 19.

SYNC output frequency

STEP_SEL (fFS is the full-step frequency)

000

001

010

011

100

101

110

111

000

fFS /2

001

fFS

010

2· fFS

011

4· fFS

100

8· fFS

101

16· fFS

110

32· fFS

111

64· fFS

Table 20.

SYNC signal source

SYNC_SEL[2..0]

Source

EL_POS[7]

EL_POS[6]

EL_POS[5]

EL_POS[4]

EL_POS[3]

EL_POS[2]

EL_POS[1]

EL_POS[0]

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