L9963E datasheet(43/184 Pages) STMICROELECTRONICS

43 / 184 page

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

TCELL_SET_01

Settling time in respect to the first step

of the Voltage Conversion Routine

for balancing auto pause and VTREF

dynamic enable

Tested by SCAN

175

μs

TCELL_SET_10

Settling time in respect to the first step

of the Voltage Conversion Routine

for balancing auto pause and VTREF

dynamic enable

Tested by SCAN

350

μs

TCELL_SET_11

Settling time in respect to the first step

of the Voltage Conversion Routine

for balancing auto pause and VTREF

dynamic enable

Tested by SCAN

700

μs

1. The drift in spec accounts for the effects of both soldering and ageing. Post-soldering drift is provided on “as is” basis for

information only and it has been evaluated on a limited population of 30 samples, hence subject to potential deviations.

HTOL ageing was evaluated according to automotive qualification flow.

4.5

VBAT voltage measurement

4.5.1

Total battery voltage measurement

A measurement of the total stack voltage is implemented in two ways:

•

By summing the single cell voltage during the Cell Conversion, thus obtaining VBATT_SUM, stored in

Vsum_batt(19:0)

•

Directly converting the VBAT pin during VBAT Conversion, thus obtaining VBATT_MONITOR, stored in

VBAT_DIV

Both results can be read as:

Stack voltage decoding

VBATT_SUM=BINARY_CODE×VBATRES

VBATTT_MONITOR=BINARY_CODE×VBATRES

(3)

Besides that, an independent analog comparator monitors the VBAT pin for fast UV/OV detection.

Refer to Section 4.11.2 Total battery VBAT diagnostic for further information about diagnostics.

4.5.2

Electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted:

9.6 V < VBAT < 64 V; -40 °C < Tambient < 105 °C; Shift between AGND, DGND, CGND, GNDREF below +/-100

Table 40. Stack voltage measurement electrical parameters

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VBATRES

VBAT Voltage Measurement

Resolution(1)

Design info

70 V full scale input, obtained

by sum of all cell voltages

μV

VBAT_OV_SUM

VBAT Over-voltage Fault

Threshold(2)

VBATT_SUM_OV_TH

Tested by SCAN

Related to sum of ADC

(VBATT_SUM)

70.35

VBAT_UV_SUM

VBAT Under-voltage Fault

Threshold(2)

VBATT_SUM_UV_TH

Tested by SCAN

Related to sum of ADC

(VBATT_SUM)

VBAT_SUM_RES

Stack voltage UV/OV resolution

for Sum Of Cells

Tested by SCAN

364.544

L9963E

VBAT voltage measurement

DS13636 - Rev 12

page 43/184

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