L9963E datasheet(88/184 Pages) STMICROELECTRONICS

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Figure 24. Equivalent FSM behavior of the voltage conversion routine

4.12.2.1

On-Demand conversions

To start On-Demand Conversions, the user must set SOC = 1 in the ADCV_CONV register: in case the

Coulomb Counting Routine is enabled, everytime an on-demand voltage conversion is requested by setting

SOC = 1, the actual conversion start is delayed until the first useful current conversion takes place. This

allows a perfect synchronization between voltage and current samples, but might result in a maximum delay

of TCYCLEADC_CUR, that must be taken into account by user SW and added to the recommended TDATA_READY in

Table 38.

•

Cell Conversion and VBAT Conversion step are always executed

•

GPIO Conversion is executed only if GPIO_CONV = 1 in the same SPI frame

•

GPIO Terminal Diagnostics is executed only if GPIO_TERM_CONV = 1 in the same SPI frame

•

Cell Terminal Diagnostics is executed only if CELL_TERM_CONV = 1 in the same SPI frame

•

Balance Terminal Diagnostics is executed only if BAL_TERM_CONV = 1 in the same SPI frame

•

HardWare Self-Check (HWSC) is executed only if HWSC = 1 in the same SPI frame

Once set, SOC stays high until the conversion routine ends (refer to for the routine duration TROUTINE), then

it is internally reset. While SOC is high, any attempt to perform an on-demand conversion will be discarded. A

feedback on the on-demand conversion status can be retrieved via the DUTY_ON flag. Setting any of the optional

bit without setting SOC in the same SPI frame has no effect: conversion will not be started.

The user can select the desired voltage acquisition window (TCYCLEADC) by programming the ADC_FILTER_SOC

fielding the ADCV_CONV register.

L9963E

Voltage conversion routine

DS13636 - Rev 12

page 88/184

L9963E 数据表(PDF) 88 Page - STMicroelectronics