L9961 datasheet(15/63 Pages) STMICROELECTRONICS

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Figure 5. Voltage conversion routine steps

GADG220620221212SA

Cells

NCELLTCELL_FILTER

TCELL_FILTER

NTC

TTEMP_FILTER

Die Temp

TTEMP_FILTER

Table 9. Voltage conversion routine execution parameters

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

TMEAS_CYCLE

Programmable voltage

conversion routine execution

period (5 bit)

TMEASCYCLE=10ms*CODE

310

Task execution period TMEAS_CYCLE, must always be greater than the task duration. In case the task execution

period is programmed shorter than the task duration, this will result in the task being executed with random

periodicity.

Figure 6. Correct management of the task execution periodicity

GADG220620221219SA

TMEAS_CYCLE

TADCV_CONV

Task execution

trigger

time

3.4.1

Cell voltage monitor (Cx)

During cells voltage monitoring step, the voltage conversion routine measures differential voltages at Cx pins and

stores results in VCELL<x> registers. The digital sum of cells is stored in the VCELL_SUM_MEAS register.

A cell is converted only if its corresponding VCELL<x>_EN bit is enabled. By default, all cells are disabled. At

least 3 cells must be enabled in order to guarantee proper operation.

If less than 5 cells are used:

•

Mount the cells starting from the bottom-most (C0-C1)

Measurements are compared to programmable thresholds to detect the failures listed in Table 12.

Table 10. Cell voltage monitor diagnostics

Fault

type

Assertion condition

IC reaction to

assertion

Release condition

IC reaction to flag

clear

Maskable

Cell UV

If a cell voltage falls

below VCELL_UV_TH,

the corresponding UV

counter is incremented

by 1

The CELL<x>_UV flag

is set

If a cell voltage raises

above VCELL_UV_TH,

the corresponding UV

counter is decremented

by 1.

The discharge FET

is restored to the

status defined by the

DCHG_ON bit

VCELL<x>_EN

masks measurement

execution. The UV flag

of a disabled cell can

always be cleared

L9961

Voltage conversion routine

DS14012 - Rev 1

page 15/63

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