L9963E datasheet(100/184 Pages) STMICROELECTRONICS

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Table 70. NCYCLE counter and optional step periodicity

NCYCLE COUNTER (11 bit)

1024

512

256

128

b10

STEP LIST

GPIO

GPIO Term

Cell Term

Bal Term

ADC BIST

Analog Comp

The NCYCLE is an 11 bit counter. Optional steps can be configured (via their NCYCLE_X) to be executed every

time a specific bx bit toggles. Once the counter reaches the saturation value (2047), it is designed to roll over.

Hence, operation periodicity is not affected and may continue for an arbitrary number of cycles.

4.12.5

Transition between cyclic wake up and normal states

Any asynchronous event causing L9963E moving to low power states will have the following effect on the voltage

conversion routine:

•

If the OVR_LATCH is set, it means that a Configuration Override is ongoing or has occurred and the

command is ignored. In fact, a Configuration Override cannot be interrupted. Moreover, L9963E is locked

in Normal state upon failure detection. Hence, the microcontroller must clear the OVR_LATCH before

transitioning to a different state. The microcontroller has a feedback that the command was discarded

because:

–

The FAULTL line is risen in case of Configuration Override thus propagating the fault down to the

micro.

–

The Configuration Override latch is set (OVR_LATCH = 1).

•

However, if the MCU does not respond within the communication timeout, the device will move to sleep

anyway.

•

If no failure occurred, any ongoing conversion activity can be interrupted by a GO2SLP command. The

device will immediately move to a low power state (Sleep, Cyclic Wakeup or Silent Balance).

•

To determine the next state, the CONF_CYCLIC_EN bit will be evaluated:

–

In case CONF_CYCLIC_EN = 1 L9963E will move to Cyclic Wakeup state, where the wakeup timer

is TCYCLE_SLEEP and the voltage acquisition window (TCYCLEADC) is ADC_FILTER_SLEEP. The

TCYCLE_OVF failure is avoided by design, since the ADC_FILTER_SLEEP can be only programmed

among the first 4 values listed in Table 38. This makes TROUTINE < TCYCLE_SLEEP by design.

–

In case CONF_CYCLIC_EN = 0 L9963E will move to Sleep or Silent Bal state depending on

slp_bal_conf.

The dual case is represented by the Cyclic Wakeup → Normal transition. During cyclic wake up, a wake up

condition may occur:

•

If the wake up condition does not involve any Configuration Override (e.g. Microcontroller sent a wake up

frame or FAULTH was interpreted ‘high’), then L9963E will move to Normal state and the cyclic activity will

continue, since CONF_CYCLIC_EN is still ‘1’.

•

In case an internal failure is detected during the routine execution, the internal wakeup condition will move

L9963E to Normal, while Configuration Override takes place.

L9963E

Voltage conversion routine

DS13636 - Rev 12

page 100/184

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