L9963E datasheet(89/184 Pages) STMICROELECTRONICS

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Registers containing measurement results are updated as soon as the related conversion step is over, so they are

available before TROUTINE ends. Each measurement register contains a d_rdy_xx (data ready) bit, which is set

when a new measurement incomes and is reset upon a data read operation.

Upon an on-demand conversion (SOC), the first step of the voltage conversion routine (cell measurement) is

delayed until the first available current conversion start pulse comes. Hence, the cell measurement will start

synchronously with the current sample acquisition. This technique is effective only by choosing the shortest filter

option for voltage conversion routines (TCYCLEADC_000).

On-Demand Conversions have lower priority than Configuration Override. When SOC 0 → 1:

•

If a Configuration Override is ongoing, it won’t be affected by SOC command. Therefore SOC,

GPIO_CONV and DIAG bit will be discarded and kept ‘0’.

4.12.2.2

Cyclic conversions

To start Cyclic Conversions, the user must set CONF_CYCLIC_EN = 1 in the ADCV_CONV register. The

ADC_FILTER_CYCLE determines the duration of the routine steps. Cyclic Conversions activity can be used for

both diagnostic and measurement purposes:

•

In case the routine is only intended for diagnostic purposes, the user may program CYCLIC_UPDATE

= 0. This setting will cause any conversion result to be used only for internal comparisons. Data will be

subsequently discarded and registers containing measurement results won’t be updated.

•

In case measurement results are important, the user may program CYCLIC_UPDATE = 1, thus causing

measurement registers update upon each step completion, as for On-Demand Conversions. Be aware that

results of a previous on-demand conversion might be overwritten by the ones of cyclic executions.

Two counters are implemented for driving the cyclic execution:

•

TCYCLE is an SPI programmable timer accounting for cycle period. User can program the TCYCLE field in

the ADCV_CONV register.

•

NCYCLE is an internal counter, incremented by 1 every time TCYCLE expires: it counts the number of

cycles executed. It works in conjunction with the NCYCLE_X parameters to determine the periodicity of

each routine step (refer to Section 4.12.4 Operations periodicity). In general, each step is executed if its

NCYCLE_X parameter is different than 0.

TCYCLE and NCYCLE shall not be updated while Cyclic Conversions are ongoing: routine must be first

disabled by programming CONF_CYCLIC_EN = 0 and then re-enabled once all configuration parameters have

been updated.

Such counters are started/stopped upon FSM transitions. The following table summarizes all events involving the

two timers:

Table 57. Summary of the NCYCLE and TCYCLE events

Event

NCYCLE

TCYCLE

Effect on routine

Routine active phase

(TROUTINE)

Frozen

Counting

Steps are being performed

Routine idle phase

Frozen

Counting

No step is being performed

TCYCLE expiration

NCYCLE = NCYCLE + 1

Restarted from 0

Routine restarted from first step

CONF_CYCLIC_EN → 1

no action

Reset and start from 0

Routine initialized and started. See

Table 58 for additional information

CONF_CYCLIC_EN 1 → 0

Wait for idle phase

(DUTY_ON 1 → 0), then

Stop and Reset

Wait for idle phase

(DUTY_ON 1 → 0), then

Stop and Reset

Routine disabled and reset after

the active phase completion. See

Table 58 for additional information

L9963E

Voltage conversion routine

DS13636 - Rev 12

page 89/184

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