L9963E datasheet(99/184 Pages) STMICROELECTRONICS

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4.12.4

Operations periodicity

While in cyclic execution (CONF_CYCLIC_EN = 1), each step periodicity can be programmed by acting on

TCYCLE and NCYCLE_X fields:

In case of Cyclic Wake up, the wake up timer is set by TCYCLE_SLEEP instead of TCYCLE.

Table 68. TCYCLE and NCYCLE_X options

TCYCLE / TCYCLE_SLEEP

CYCLE PERIOD

NCYCLE_X

CYCLIC OCCURRENCE

000

100 ms

000

Excluded from voltage conversion routine

001

200 ms

001

Occurs every 1 cycle

010

400 ms

010

Occurs every 4 cycles

011

800 ms

011

Occurs every 16 cycles

100

1.6 s

100

Occurs every 64 cycles

101

3.2 s

101

Occurs every 128 cycles

110

6.4 s

110

Occurs every 512 cycles

111

12.8 s

111

Occurs every 1024 cycles

By combining the two fields, each step periodicity can be evaluated as follows:

Evaluation of a step periodicity

TSTEP=NCYCLEX×TCYCLE, wℎen not in continuous mode or overflow

TSTEP=NCYCLEX×TROUTINE, wℎen in continuous mode or overflow

(16)

The periodicity ranges from a minimum of 100 ms to a maximum of 3.64 hours (13107.2 s):

•

Important functional checks such as HWSC might be executed with a high frequency

•

Time consuming operations such as open load diagnostics might be performed with a low frequency

Table 69 lists all the available periodicity options, calculated according to Eq. (16) assuming L9963E is not in

continuous mode or overflow:

Table 69. Steps periodicity options

Tcycle

Ncycle

000

001

010

011

100

101

110

111

000

Disabled

001

100 ms

200 ms

400 ms

800 ms

1.6 s

3.2 s

6.4 s

12.8 s

010

400 ms

800 ms

1.6 s

3.2 s

6.4 s

12.8 s

25.6 s

51.2 s

011

1.6 s

3.2 s

6.4 s

12.8 s

25.6 s

51.2 s

102.4 s

204.8 s

100

6.4 s

12.8 s

25.6 s

51.2 s

102.4 s

204.8 s

409.6 s

819.2 s

101

12.8 s

25.6 s

51.2 s

102.4 s

204.8 s

409.6 s

819.2 s

1638.4 s

110

51.2 s

102.4 s

204.8 s

409.6 s

819.2 s

1638.4 s

3276.8 s

6553.6 s

111

102.4 s

204.8 s

409.6 s

819.2 s

1638.4 s

3276.8 s

6553.6 s

13107.2 s

Changing NCYCLE_X for a step while cyclic activity is enabled (CONF_CYCLIC_EN = 1) will cause the new

setting to be applied at the first useful cycle (refer to Table 59).

L9963E

Voltage conversion routine

DS13636 - Rev 12

page 99/184

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