L9961 datasheet(60/65 Pages) STMICROELECTRONICS

60 / 65 page

Contents

Pin description and block diagram .................................................3

1.1

Device pinout .................................................................. 3

1.2

Block diagram ................................................................. 5

Product electrical and thermal ratings..............................................6

2.1

Operating range (OR) ........................................................... 6

2.2

Absolute maximum ratings (AMR) ................................................ 7

2.3

ESD ratings ................................................................... 7

2.4

Thermal ratings ................................................................ 8

Functional description .............................................................9

3.1

Device funcional states.......................................................... 9

3.1.1

Shipment - DEEP SLEEP .................................................. 9

3.1.2

STANDBY .............................................................. 9

3.1.3

NORMAL ............................................................. 10

3.1.4

Electrical parameters .................................................... 11

3.2

Wakeup sources (NSHIP/WAKEUP) ............................................. 12

3.2.1

Electrical parameters .................................................... 12

3.3

VREG LDO .................................................................. 13

3.3.1

Electrical parameters .................................................... 13

3.4

Voltage conversion routine...................................................... 14

3.4.1

Cell voltage monitor (Cx).................................................. 15

3.4.2

Battery stack monitor (VB) ................................................ 19

3.4.3

Cell temperature monitor (NTC) ............................................ 20

3.4.4

Die temperature monitor (TJ)............................................... 22

3.4.5

Diagnostics principle ..................................................... 23

3.5

Current conversion routine...................................................... 25

3.5.1

Current sense ADC (ISENSEP/ISENSEM) .................................... 25

3.5.2

Coulomb counting ....................................................... 28

3.5.3

Overcurrent monitor ..................................................... 29

3.5.4

Short-circuit in discharge protection ......................................... 31

3.6

Cell balancing ................................................................ 32

L9961

Contents

DS14012 - Rev 3

page 60/65

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