L9918 datasheet(103/109 Pages) STMICROELECTRONICS

103 / 109 page

1.4.6

Voltage divider & ΣΔ modulator for overvoltage/undervoltage ....................... 7

1.4.7

Thermal sensor .......................................................... 7

1.4.8

Oscillator............................................................... 7

1.4.9

Excitation driver ......................................................... 7

1.4.10

Safety switch OFF........................................................ 7

1.4.11

Charge pump ........................................................... 7

1.4.12

Non volatile memory (NVM) ................................................ 7

1.4.13

Digital block ............................................................ 7

1.5

State diagram ................................................................. 7

1.5.1

Standby................................................................ 8

1.5.2

Wake-up ............................................................... 8

1.5.3

Pre-excitation ........................................................... 9

1.5.4

Regulation mode......................................................... 9

1.5.5

Regulation default ....................................................... 10

1.5.6

Safety ................................................................ 10

1.6

Product characteristics ......................................................... 11

1.6.1

Absolute maximum ratings ................................................ 11

1.6.2

Internal clamping structure ................................................ 11

1.6.3

PIN number - absolute maximum ratings - operative range ....................... 11

1.6.4

Thermal data........................................................... 11

Power supply and battery voltage sensing - B+ pin ................................13

2.1

B+ electrical characteristic ...................................................... 13

2.2

B+ characteristics ............................................................. 15

2.2.1

Set point value correction ................................................. 15

2.2.2

Voltage regulation loop ................................................... 15

2.2.3

Thermal compensation ................................................... 16

2.2.4

UV/OV management ..................................................... 17

Phase sense input - PH pin .......................................................20

3.1

PH electrical characteristic...................................................... 20

3.2

PH characteristics ............................................................. 22

3.2.1

Alternator pole pairs ..................................................... 22

3.2.2

Phase regulation ........................................................ 22

L9918

Contents

DS13000 - Rev 2

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